Use lru_cache for tokenization tests (#36818)

* fix

* fix

* fix

* fix

---------

Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>

tests/models/albert/test_tokenization_albert.py

@@ -34,12 +34,13 @@ class AlbertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_sentencepiece = True
     test_sentencepiece_ignore_case = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = AlbertTokenizer(SAMPLE_VOCAB)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "this is a test"

tests/models/bart/test_tokenization_bart.py

@@ -14,13 +14,14 @@
 import json
 import os
 import unittest
+from functools import lru_cache
 
 from transformers import BartTokenizer, BartTokenizerFast, BatchEncoding
 from transformers.models.roberta.tokenization_roberta import VOCAB_FILES_NAMES
 from transformers.testing_utils import require_tokenizers, require_torch
 from transformers.utils import cached_property
 
-from ...test_tokenization_common import TokenizerTesterMixin, filter_roberta_detectors
+from ...test_tokenization_common import TokenizerTesterMixin, filter_roberta_detectors, use_cache_if_possible
 
 
 @require_tokenizers
@@ -32,8 +33,10 @@ class TestTokenizationBart(TokenizerTesterMixin, unittest.TestCase):
     from_pretrained_filter = filter_roberta_detectors
     # from_pretrained_kwargs = {'add_prefix_space': True}
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+
         vocab = [
             "l",
             "o",
@@ -58,22 +61,30 @@ class TestTokenizationBart(TokenizerTesterMixin, unittest.TestCase):
         ]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["#version: 0.2", "\u0120 l", "\u0120l o", "\u0120lo w", "e r", ""]
-        self.special_tokens_map = {"unk_token": "<unk>"}
+        cls.special_tokens_map = {"unk_token": "<unk>"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return self.tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
-    def get_rust_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return self.rust_tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         return "lower newer", "lower newer"
@@ -154,8 +165,8 @@ class TestTokenizationBart(TokenizerTesterMixin, unittest.TestCase):
     def test_embeded_special_tokens(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 sentence = "A, <mask> AllenNLP sentence."
                 tokens_r = tokenizer_r.encode_plus(sentence, add_special_tokens=True, return_token_type_ids=True)
                 tokens_p = tokenizer_p.encode_plus(sentence, add_special_tokens=True, return_token_type_ids=True)

tests/models/barthez/test_tokenization_barthez.py

@@ -31,13 +31,14 @@ class BarthezTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         tokenizer = BarthezTokenizerFast.from_pretrained("moussaKam/mbarthez")
-        tokenizer.save_pretrained(self.tmpdirname)
-        tokenizer.save_pretrained(self.tmpdirname, legacy_format=False)
-        self.tokenizer = tokenizer
+        tokenizer.save_pretrained(cls.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname, legacy_format=False)
+        cls.tokenizer = tokenizer
 
     def test_convert_token_and_id(self):
         """Test ``_convert_token_to_id`` and ``_convert_id_to_token``."""

tests/models/bartpho/test_tokenization_bartpho.py

@@ -15,11 +15,12 @@
 
 import os
 import unittest
+from functools import lru_cache
 
 from transformers.models.bartpho.tokenization_bartpho import VOCAB_FILES_NAMES, BartphoTokenizer
 from transformers.testing_utils import get_tests_dir
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 SAMPLE_VOCAB = get_tests_dir("fixtures/test_sentencepiece_bpe.model")
@@ -31,24 +32,29 @@ class BartphoTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = False
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab = ["▁This", "▁is", "▁a", "▁t", "est"]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
-        self.special_tokens_map = {"unk_token": "<unk>"}
+        cls.special_tokens_map = {"unk_token": "<unk>"}
 
-        self.monolingual_vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["monolingual_vocab_file"])
-        with open(self.monolingual_vocab_file, "w", encoding="utf-8") as fp:
+        cls.monolingual_vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["monolingual_vocab_file"])
+        with open(cls.monolingual_vocab_file, "w", encoding="utf-8") as fp:
             for token in vocab_tokens:
                 fp.write(f"{token} {vocab_tokens[token]}\n")
 
-        tokenizer = BartphoTokenizer(SAMPLE_VOCAB, self.monolingual_vocab_file, **self.special_tokens_map)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer = BartphoTokenizer(SAMPLE_VOCAB, cls.monolingual_vocab_file, **cls.special_tokens_map)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return BartphoTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return BartphoTokenizer.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "This is a là test"

tests/models/bert/test_tokenization_bert.py

@@ -41,8 +41,9 @@ class BertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     space_between_special_tokens = True
     from_pretrained_filter = filter_non_english
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab_tokens = [
             "[UNK]",
@@ -61,8 +62,8 @@ class BertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             "low",
             "lowest",
         ]
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as vocab_writer:
             vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
 
     def get_input_output_texts(self, tokenizer):
@@ -257,7 +258,7 @@ class BertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_offsets_with_special_characters(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 sentence = f"A, naïve {tokenizer_r.mask_token} AllenNLP sentence."
                 tokens = tokenizer_r.encode_plus(
@@ -312,8 +313,8 @@ class BertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 kwargs["tokenize_chinese_chars"] = True
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 ids_without_spe_char_p = tokenizer_p.encode(text_with_chinese_char, add_special_tokens=False)
                 ids_without_spe_char_r = tokenizer_r.encode(text_with_chinese_char, add_special_tokens=False)
@@ -326,8 +327,8 @@ class BertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                 self.assertListEqual(tokens_without_spe_char_r, list_of_commun_chinese_char)
 
                 kwargs["tokenize_chinese_chars"] = False
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 ids_without_spe_char_r = tokenizer_r.encode(text_with_chinese_char, add_special_tokens=False)
                 ids_without_spe_char_p = tokenizer_p.encode(text_with_chinese_char, add_special_tokens=False)

tests/models/bert_generation/test_tokenization_bert_generation.py

@@ -34,11 +34,12 @@ class BertGenerationTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = False
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         tokenizer = BertGenerationTokenizer(SAMPLE_VOCAB, keep_accents=True)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def test_convert_token_and_id(self):
         """Test ``_convert_token_to_id`` and ``_convert_id_to_token``."""

tests/models/bert_japanese/test_tokenization_bert_japanese.py

@@ -17,6 +17,7 @@
 import os
 import pickle
 import unittest
+from functools import lru_cache
 
 from transformers import AutoTokenizer
 from transformers.models.bert.tokenization_bert import BertTokenizer
@@ -31,7 +32,7 @@ from transformers.models.bert_japanese.tokenization_bert_japanese import (
 )
 from transformers.testing_utils import custom_tokenizers, require_jumanpp, require_sudachi_projection
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 @custom_tokenizers
@@ -41,8 +42,9 @@ class BertJapaneseTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = False
     space_between_special_tokens = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab_tokens = [
             "[UNK]",
@@ -72,8 +74,8 @@ class BertJapaneseTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             "です",
         ]
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as vocab_writer:
             vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
 
     def get_input_output_texts(self, tokenizer):
@@ -408,17 +410,21 @@ class BertJapaneseCharacterTokenizationTest(TokenizerTesterMixin, unittest.TestC
     tokenizer_class = BertJapaneseTokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab_tokens = ["[UNK]", "[CLS]", "[SEP]", "こ", "ん", "に", "ち", "は", "ば", "世", "界", "、", "。"]
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as vocab_writer:
             vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
 
-    def get_tokenizer(self, **kwargs):
-        return BertJapaneseTokenizer.from_pretrained(self.tmpdirname, subword_tokenizer_type="character", **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        return BertJapaneseTokenizer.from_pretrained(cls.tmpdirname, subword_tokenizer_type="character", **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "こんにちは、世界。 \nこんばんは、世界。"

tests/models/bertweet/test_tokenization_bertweet.py

@@ -15,10 +15,11 @@
 
 import os
 import unittest
+from functools import lru_cache
 
 from transformers.models.bertweet.tokenization_bertweet import VOCAB_FILES_NAMES, BertweetTokenizer
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 class BertweetTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
@@ -26,26 +27,31 @@ class BertweetTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     tokenizer_class = BertweetTokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # Adapted from Sennrich et al. 2015 and https://github.com/rsennrich/subword-nmt
         vocab = ["I", "m", "V@@", "R@@", "r", "e@@"]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["#version: 0.2", "a m</w>"]
-        self.special_tokens_map = {"unk_token": "<unk>"}
+        cls.special_tokens_map = {"unk_token": "<unk>"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             for token in vocab_tokens:
                 fp.write(f"{token} {vocab_tokens[token]}\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return BertweetTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return BertweetTokenizer.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "I am VinAI Research"

tests/models/big_bird/test_tokenization_big_bird.py

@@ -36,11 +36,12 @@ class BigBirdTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
-        tokenizer = self.tokenizer_class(SAMPLE_VOCAB, keep_accents=True)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer = cls.tokenizer_class(SAMPLE_VOCAB, keep_accents=True)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def test_convert_token_and_id(self):
         """Test ``_convert_token_to_id`` and ``_convert_id_to_token``."""

tests/models/biogpt/test_tokenization_biogpt.py

@@ -30,8 +30,9 @@ class BioGptTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     tokenizer_class = BioGptTokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # Adapted from Sennrich et al. 2015 and https://github.com/rsennrich/subword-nmt
         vocab = [
@@ -60,11 +61,11 @@ class BioGptTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["l o 123", "lo w 1456", "e r</w> 1789", ""]
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w") as fp:
             fp.write(json.dumps(vocab_tokens))
-        with open(self.merges_file, "w") as fp:
+        with open(cls.merges_file, "w") as fp:
             fp.write("\n".join(merges))
 
     def get_input_output_texts(self, tokenizer):

tests/models/blenderbot_small/test_tokenization_blenderbot_small.py

@@ -18,13 +18,14 @@
 import json
 import os
 import unittest
+from functools import lru_cache
 
 from transformers.models.blenderbot_small.tokenization_blenderbot_small import (
     VOCAB_FILES_NAMES,
     BlenderbotSmallTokenizer,
 )
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 class BlenderbotSmallTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
@@ -32,25 +33,30 @@ class BlenderbotSmallTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
     tokenizer_class = BlenderbotSmallTokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab = ["__start__", "adapt", "act", "ap@@", "te", "__end__", "__unk__"]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
 
         merges = ["#version: 0.2", "a p", "t e</w>", "ap t</w>", "a d", "ad apt</w>", "a c", "ac t</w>", ""]
-        self.special_tokens_map = {"unk_token": "__unk__", "bos_token": "__start__", "eos_token": "__end__"}
+        cls.special_tokens_map = {"unk_token": "__unk__", "bos_token": "__start__", "eos_token": "__end__"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return BlenderbotSmallTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return BlenderbotSmallTokenizer.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "adapt act apte"

tests/models/bloom/test_tokenization_bloom.py

@@ -13,14 +13,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import copy
 import unittest
+from functools import lru_cache
 
 from datasets import load_dataset
 
 from transformers import BloomTokenizerFast
 from transformers.testing_utils import require_jinja, require_tokenizers
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 @require_tokenizers
@@ -34,14 +36,21 @@ class BloomTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     from_pretrained_vocab_key = "tokenizer_file"
     special_tokens_map = {"bos_token": "<s>", "eos_token": "</s>", "unk_token": "<unk>", "pad_token": "<pad>"}
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
         tokenizer = BloomTokenizerFast.from_pretrained("bigscience/tokenizer")
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
-    def get_rust_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return BloomTokenizerFast.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs):
+        _kwargs = copy.deepcopy(cls.special_tokens_map)
+        _kwargs.update(kwargs)
+        kwargs = _kwargs
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return BloomTokenizerFast.from_pretrained(pretrained_name, **kwargs)
 
     @unittest.skip(reason="This needs a slow tokenizer. Bloom does not have one!")
     def test_encode_decode_with_spaces(self):
@@ -65,7 +74,7 @@ class BloomTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_padding(self, max_length=6):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
                 # tokenizer_r.pad_token = None # Hotfixing padding = None
                 # Simple input
                 s = "This is a simple input"

tests/models/byt5/test_tokenization_byt5.py

@@ -19,12 +19,13 @@ import re
 import shutil
 import tempfile
 import unittest
+from functools import lru_cache
 from typing import Tuple
 
 from transformers import AddedToken, BatchEncoding, ByT5Tokenizer
 from transformers.utils import cached_property, is_tf_available, is_torch_available
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 if is_torch_available():
@@ -39,17 +40,22 @@ class ByT5TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     tokenizer_class = ByT5Tokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
         tokenizer = ByT5Tokenizer()
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     @cached_property
     def t5_base_tokenizer(self):
         return ByT5Tokenizer.from_pretrained("google/byt5-small")
 
-    def get_tokenizer(self, **kwargs) -> ByT5Tokenizer:
-        return self.tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs) -> ByT5Tokenizer:
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
     def get_clean_sequence(self, tokenizer, with_prefix_space=False, max_length=20, min_length=5) -> Tuple[str, list]:
         # XXX The default common tokenizer tests assume that every ID is decodable on its own.

tests/models/camembert/test_tokenization_camembert.py

@@ -15,6 +15,7 @@
 
 import tempfile
 import unittest
+from tempfile import TemporaryDirectory
 
 from transformers import AddedToken, CamembertTokenizer, CamembertTokenizerFast
 from transformers.testing_utils import get_tests_dir, require_sentencepiece, require_tokenizers, slow
@@ -38,12 +39,13 @@ class CamembertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = CamembertTokenizer(SAMPLE_VOCAB)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     @unittest.skip(
         "Token maps are not equal because someone set the probability of ('<unk>NOTUSED', -100), so it's never encoded for fast"
@@ -72,8 +74,9 @@ class CamembertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
     def test_rust_and_python_bpe_tokenizers(self):
         tokenizer = CamembertTokenizer(SAMPLE_BPE_VOCAB)
-        tokenizer.save_pretrained(self.tmpdirname)
-        rust_tokenizer = CamembertTokenizerFast.from_pretrained(self.tmpdirname)
+        with TemporaryDirectory() as tmpdirname:
+            tokenizer.save_pretrained(tmpdirname)
+            rust_tokenizer = CamembertTokenizerFast.from_pretrained(tmpdirname)
 
         sequence = "I was born in 92000, and this is falsé."
 
@@ -147,11 +150,11 @@ class CamembertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             self.assertTrue(all(item in tokenizer.added_tokens_decoder.items() for item in expected.items()))
             return tokenizer
 
-        new_eos = AddedToken("[NEW_EOS]", rstrip=False, lstrip=True, normalized=False)
+        new_eos = AddedToken("[NEW_EOS]", rstrip=False, lstrip=True, normalized=False, special=True)
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 # Load a slow tokenizer from the hub, init with the new token for fast to also include it
-                tokenizer = self.tokenizer_class.from_pretrained(pretrained_name, eos_token=new_eos)
+                tokenizer = self.get_tokenizer(pretrained_name, eos_token=new_eos)
                 EXPECTED_ADDED_TOKENS_DECODER = tokenizer.added_tokens_decoder
                 with self.subTest("Hub -> Slow: Test loading a slow tokenizer from the hub)"):
                     self.assertEqual(tokenizer._special_tokens_map["eos_token"], new_eos)
@@ -191,9 +194,7 @@ class CamembertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
                 with self.subTest("Hub -> Fast: Test loading a fast tokenizer from the hub)"):
                     if self.rust_tokenizer_class is not None:
-                        tokenizer_fast = self.rust_tokenizer_class.from_pretrained(
-                            pretrained_name, eos_token=new_eos, from_slow=True
-                        )
+                        tokenizer_fast = self.get_rust_tokenizer(pretrained_name, eos_token=new_eos, from_slow=True)
                         self.assertEqual(tokenizer_fast._special_tokens_map["eos_token"], new_eos)
                         self.assertIn(new_eos, list(tokenizer_fast.added_tokens_decoder.values()))
                         # We can't test the following because for BC we kept the default rstrip lstrip in slow not fast. Will comment once normalization is alright

tests/models/canine/test_tokenization_canine.py

@@ -18,13 +18,14 @@ import os
 import shutil
 import tempfile
 import unittest
+from functools import lru_cache
 
 from transformers import BatchEncoding, CanineTokenizer
 from transformers.testing_utils import require_tokenizers, require_torch
 from transformers.tokenization_utils import AddedToken
 from transformers.utils import cached_property
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 class CanineTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
@@ -32,17 +33,22 @@ class CanineTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     tokenizer_class = CanineTokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
         tokenizer = CanineTokenizer()
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     @cached_property
     def canine_tokenizer(self):
         return CanineTokenizer.from_pretrained("google/canine-s")
 
-    def get_tokenizer(self, **kwargs) -> CanineTokenizer:
-        tokenizer = self.tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs) -> CanineTokenizer:
+        pretrained_name = pretrained_name or cls.tmpdirname
+        tokenizer = cls.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
         tokenizer._unicode_vocab_size = 1024
         return tokenizer
 

tests/models/clip/test_tokenization_clip.py

@@ -17,12 +17,13 @@
 import json
 import os
 import unittest
+from functools import lru_cache
 
 from transformers import CLIPTokenizer, CLIPTokenizerFast
 from transformers.models.clip.tokenization_clip import VOCAB_FILES_NAMES
 from transformers.testing_utils import require_ftfy, require_tokenizers
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 @require_tokenizers
@@ -34,28 +35,37 @@ class CLIPTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     from_pretrained_kwargs = {}
     test_seq2seq = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab = ["l", "o", "w", "e", "r", "s", "t", "i", "d", "n", "lo", "l</w>", "w</w>", "r</w>", "t</w>", "low</w>", "er</w>", "lowest</w>", "newer</w>", "wider", "<unk>", "<|startoftext|>", "<|endoftext|>"]  # fmt: skip
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["#version: 0.2", "l o", "lo w</w>", "e r</w>"]
-        self.special_tokens_map = {"unk_token": "<unk>"}
+        cls.special_tokens_map = {"unk_token": "<unk>"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return CLIPTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return CLIPTokenizer.from_pretrained(pretrained_name, **kwargs)
 
-    def get_rust_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return CLIPTokenizerFast.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return CLIPTokenizerFast.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "lower newer"
@@ -77,8 +87,8 @@ class CLIPTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_check_encoding_slow_fast(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_s = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_s = self.get_tokenizer(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 text = "A\n'll 11p223RF☆ho!!to?'d'd''d of a cat to-$''d."
                 text_tokenized_s = tokenizer_s.tokenize(text)
@@ -138,7 +148,7 @@ class CLIPTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                 text_of_1_token = "hello"  # `hello` is a token in the vocabulary of `pretrained_name`
                 text = f"{text_of_1_token} {text_of_1_token}"
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name,
                     use_fast=True,
                 )
@@ -151,7 +161,7 @@ class CLIPTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
                 text = f" {text}"
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name,
                     use_fast=True,
                 )
@@ -166,7 +176,7 @@ class CLIPTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         # Test related to the breaking change introduced in transformers v4.17.0
         # We need to check that an error in raised when the user try to load a previous version of the tokenizer.
         with self.assertRaises(ValueError) as context:
-            self.rust_tokenizer_class.from_pretrained("robot-test/old-clip-tokenizer")
+            self.get_rust_tokenizer("robot-test/old-clip-tokenizer")
 
         self.assertTrue(
             context.exception.args[0].startswith(

tests/models/clvp/test_tokenization_clvp.py

@@ -17,11 +17,12 @@
 import json
 import os
 import unittest
+from functools import lru_cache
 from typing import List
 
 from transformers import ClvpTokenizer
 
-from ...test_tokenization_common import TokenizerTesterMixin, slow
+from ...test_tokenization_common import TokenizerTesterMixin, slow, use_cache_if_possible
 
 
 class ClvpTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
@@ -32,8 +33,9 @@ class ClvpTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_seq2seq = False
     test_sentencepiece_ignore_case = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # Adapted from Sennrich et al. 2015 and https://github.com/rsennrich/subword-nmt
         vocab = [
@@ -62,19 +64,23 @@ class ClvpTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         ]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["#version: 0.2", "\u0120 l", "\u0120l o", "\u0120lo w", "e r", ""]
-        self.special_tokens_map = {"unk_token": "<unk>"}
+        cls.special_tokens_map = {"unk_token": "<unk>"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, "vocab.json")
-        self.merges_file = os.path.join(self.tmpdirname, "merges.txt")
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, "vocab.json")
+        cls.merges_file = os.path.join(cls.tmpdirname, "merges.txt")
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
 
     # Copied from transformers.tests.models.gpt2.test_tokenization_gpt2.GPT2TokenizationTest.get_tokenizer with GPT2->Clvp
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return ClvpTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return ClvpTokenizer.from_pretrained(pretrained_name, **kwargs)
 
     # Copied from transformers.tests.models.gpt2.test_tokenization_gpt2.GPT2TokenizationTest.get_input_output_texts
     def get_input_output_texts(self, tokenizer):
@@ -134,7 +140,7 @@ class ClvpTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_padding(self, max_length=15):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 # Simple input
                 s = "This is a simple input"

tests/models/code_llama/test_tokenization_code_llama.py

@@ -53,15 +53,16 @@ class CodeLlamaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_sentencepiece = True
     from_pretrained_kwargs = {}
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = CodeLlamaTokenizer(SAMPLE_VOCAB, keep_accents=True)
         tokenizer.pad_token = tokenizer.eos_token
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
-    def get_tokenizers(self, **kwargs):
+    def get_tokenizers(cls, **kwargs):
         kwargs.update({"pad_token": "<PAD>"})
         return super().get_tokenizers(**kwargs)
 
@@ -151,8 +152,8 @@ class CodeLlamaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         ]
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 tmpdirname2 = tempfile.mkdtemp()
 
@@ -255,7 +256,7 @@ class CodeLlamaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 added_tokens = [AddedToken("<special>", lstrip=True)]
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, additional_special_tokens=added_tokens, **kwargs
                 )
                 r_output = tokenizer_r.encode("Hey this is a <special> token")
@@ -265,7 +266,7 @@ class CodeLlamaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                 self.assertTrue(special_token_id in r_output)
 
                 if self.test_slow_tokenizer:
-                    tokenizer_cr = self.rust_tokenizer_class.from_pretrained(
+                    tokenizer_cr = self.get_rust_tokenizer(
                         pretrained_name,
                         additional_special_tokens=added_tokens,
                         **kwargs,  # , from_slow=True <- unfortunately too slow to convert

tests/models/codegen/test_tokenization_codegen.py

@@ -18,12 +18,13 @@ import json
 import os
 import re
 import unittest
+from functools import lru_cache
 
 from transformers import CodeGenTokenizer, CodeGenTokenizerFast
 from transformers.models.codegen.tokenization_codegen import VOCAB_FILES_NAMES
 from transformers.testing_utils import require_tokenizers, slow
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 @require_tokenizers
@@ -35,8 +36,9 @@ class CodeGenTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     from_pretrained_kwargs = {"add_prefix_space": True}
     test_seq2seq = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # Adapted from Sennrich et al. 2015 and https://github.com/rsennrich/subword-nmt
         vocab = [
@@ -64,22 +66,30 @@ class CodeGenTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         ]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["#version: 0.2", "\u0120 l", "\u0120l o", "\u0120lo w", "e r", ""]
-        self.special_tokens_map = {"unk_token": "<unk>"}
+        cls.special_tokens_map = {"unk_token": "<unk>"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return CodeGenTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return CodeGenTokenizer.from_pretrained(pretrained_name, **kwargs)
 
-    def get_rust_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return CodeGenTokenizerFast.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return CodeGenTokenizerFast.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "lower newer"
@@ -136,7 +146,7 @@ class CodeGenTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_padding(self, max_length=15):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 # Simple input
                 s = "This is a simple input"

tests/models/cohere/test_tokenization_cohere.py

@@ -13,12 +13,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import copy
 import unittest
+from functools import lru_cache
 
 from transformers import CohereTokenizerFast
 from transformers.testing_utils import require_jinja, require_tokenizers, require_torch_multi_gpu
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 @require_tokenizers
@@ -37,14 +39,21 @@ class CohereTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         "pad_token": "<PAD>",
     }
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
         tokenizer = CohereTokenizerFast.from_pretrained("hf-internal-testing/tiny-random-CohereForCausalLM")
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
-    def get_rust_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return CohereTokenizerFast.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs):
+        _kwargs = copy.deepcopy(cls.special_tokens_map)
+        _kwargs.update(kwargs)
+        kwargs = _kwargs
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return CohereTokenizerFast.from_pretrained(pretrained_name, **kwargs)
 
     # This gives CPU OOM on a single-gpu runner (~60G RAM). On multi-gpu runner, it has ~180G RAM which is enough.
     @require_torch_multi_gpu
@@ -80,7 +89,7 @@ class CohereTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_padding(self, max_length=10):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
                 # tokenizer_r.pad_token = None # Hotfixing padding = None
                 # Simple input
                 s = "This is a simple input"

tests/models/cpmant/test_tokenization_cpmant.py

@@ -28,8 +28,9 @@ class CPMAntTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     tokenizer_class = CpmAntTokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab_tokens = [
             "<d>",
@@ -49,8 +50,8 @@ class CPMAntTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             "n",
             "t",
         ]
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as vocab_writer:
             vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
 
     @tooslow

tests/models/ctrl/test_tokenization_ctrl.py

@@ -16,10 +16,11 @@
 import json
 import os
 import unittest
+from functools import lru_cache
 
 from transformers.models.ctrl.tokenization_ctrl import VOCAB_FILES_NAMES, CTRLTokenizer
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 class CTRLTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
@@ -28,25 +29,30 @@ class CTRLTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = False
     test_seq2seq = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # Adapted from Sennrich et al. 2015 and https://github.com/rsennrich/subword-nmt
         vocab = ["adapt", "re@@", "a@@", "apt", "c@@", "t", "<unk>"]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["#version: 0.2", "a p", "ap t</w>", "r e", "a d", "ad apt</w>", ""]
-        self.special_tokens_map = {"unk_token": "<unk>"}
+        cls.special_tokens_map = {"unk_token": "<unk>"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return CTRLTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return CTRLTokenizer.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "adapt react readapt apt"

tests/models/deberta/test_tokenization_deberta.py

@@ -17,12 +17,13 @@
 import json
 import os
 import unittest
+from functools import lru_cache
 
 from transformers import DebertaTokenizer, DebertaTokenizerFast
 from transformers.models.deberta.tokenization_deberta import VOCAB_FILES_NAMES
 from transformers.testing_utils import slow
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 class DebertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
@@ -31,8 +32,9 @@ class DebertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     rust_tokenizer_class = DebertaTokenizerFast
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # Adapted from Sennrich et al. 2015 and https://github.com/rsennrich/subword-nmt
         vocab = [
@@ -59,18 +61,22 @@ class DebertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         ]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["#version: 0.2", "\u0120 l", "\u0120l o", "\u0120lo w", "e r", ""]
-        self.special_tokens_map = {"unk_token": "[UNK]"}
+        cls.special_tokens_map = {"unk_token": "[UNK]"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return self.tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "lower newer"

tests/models/deberta_v2/test_tokenization_deberta_v2.py

@@ -33,12 +33,13 @@ class DebertaV2TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_sentencepiece = True
     test_sentencepiece_ignore_case = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = DebertaV2Tokenizer(SAMPLE_VOCAB, unk_token="<unk>")
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "this is a test"

tests/models/distilbert/test_tokenization_distilbert.py

@@ -17,11 +17,11 @@
 from transformers import DistilBertTokenizer, DistilBertTokenizerFast
 from transformers.testing_utils import require_tokenizers, slow
 
-from ..bert.test_tokenization_bert import BertTokenizationTest
+from ..bert import test_tokenization_bert
 
 
 @require_tokenizers
-class DistilBertTokenizationTest(BertTokenizationTest):
+class DistilBertTokenizationTest(test_tokenization_bert.BertTokenizationTest):
     tokenizer_class = DistilBertTokenizer
     rust_tokenizer_class = DistilBertTokenizerFast
     test_rust_tokenizer = True

tests/models/dpr/test_tokenization_dpr.py

@@ -25,11 +25,11 @@ from transformers import (
 from transformers.testing_utils import require_tokenizers, slow
 from transformers.tokenization_utils_base import BatchEncoding
 
-from ..bert.test_tokenization_bert import BertTokenizationTest
+from ..bert import test_tokenization_bert
 
 
 @require_tokenizers
-class DPRContextEncoderTokenizationTest(BertTokenizationTest):
+class DPRContextEncoderTokenizationTest(test_tokenization_bert.BertTokenizationTest):
     tokenizer_class = DPRContextEncoderTokenizer
     rust_tokenizer_class = DPRContextEncoderTokenizerFast
     test_rust_tokenizer = True
@@ -37,7 +37,7 @@ class DPRContextEncoderTokenizationTest(BertTokenizationTest):
 
 
 @require_tokenizers
-class DPRQuestionEncoderTokenizationTest(BertTokenizationTest):
+class DPRQuestionEncoderTokenizationTest(test_tokenization_bert.BertTokenizationTest):
     tokenizer_class = DPRQuestionEncoderTokenizer
     rust_tokenizer_class = DPRQuestionEncoderTokenizerFast
     test_rust_tokenizer = True
@@ -45,7 +45,7 @@ class DPRQuestionEncoderTokenizationTest(BertTokenizationTest):
 
 
 @require_tokenizers
-class DPRReaderTokenizationTest(BertTokenizationTest):
+class DPRReaderTokenizationTest(test_tokenization_bert.BertTokenizationTest):
     tokenizer_class = DPRReaderTokenizer
     rust_tokenizer_class = DPRReaderTokenizerFast
     test_rust_tokenizer = True

tests/models/electra/test_tokenization_electra.py

@@ -40,8 +40,9 @@ class ElectraTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     space_between_special_tokens = True
     from_pretrained_filter = filter_non_english
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab_tokens = [
             "[UNK]",
@@ -60,8 +61,8 @@ class ElectraTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             "low",
             "lowest",
         ]
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as vocab_writer:
             vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
 
     def get_input_output_texts(self, tokenizer):
@@ -250,7 +251,7 @@ class ElectraTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_offsets_with_special_characters(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 sentence = f"A, naïve {tokenizer_r.mask_token} AllenNLP sentence."
                 tokens = tokenizer_r.encode_plus(
@@ -305,8 +306,8 @@ class ElectraTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 kwargs["tokenize_chinese_chars"] = True
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 ids_without_spe_char_p = tokenizer_p.encode(text_with_chinese_char, add_special_tokens=False)
                 ids_without_spe_char_r = tokenizer_r.encode(text_with_chinese_char, add_special_tokens=False)
@@ -319,8 +320,8 @@ class ElectraTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                 self.assertListEqual(tokens_without_spe_char_r, list_of_commun_chinese_char)
 
                 kwargs["tokenize_chinese_chars"] = False
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 ids_without_spe_char_r = tokenizer_r.encode(text_with_chinese_char, add_special_tokens=False)
                 ids_without_spe_char_p = tokenizer_p.encode(text_with_chinese_char, add_special_tokens=False)

tests/models/esm/test_tokenization_esm.py

@@ -17,6 +17,7 @@
 import os
 import tempfile
 import unittest
+from functools import lru_cache
 from typing import List
 
 from transformers.models.esm.tokenization_esm import VOCAB_FILES_NAMES, EsmTokenizer
@@ -24,24 +25,32 @@ from transformers.testing_utils import require_tokenizers
 from transformers.tokenization_utils import PreTrainedTokenizer
 from transformers.tokenization_utils_base import PreTrainedTokenizerBase
 
+from ...test_tokenization_common import use_cache_if_possible
+
 
 @require_tokenizers
 class ESMTokenizationTest(unittest.TestCase):
     tokenizer_class = EsmTokenizer
 
-    def setUp(self):
-        super().setUp()
-        self.tmpdirname = tempfile.mkdtemp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+
+        cls.tmpdirname = tempfile.mkdtemp()
         vocab_tokens: List[str] = ["<cls>", "<pad>", "<eos>", "<unk>", "L", "A", "G", "V", "S", "E", "R", "T", "I", "D", "P", "K", "Q", "N", "F", "Y", "M", "H", "W", "C", "X", "B", "U", "Z", "O", ".", "-", "<null_1>", "<mask>"]  # fmt: skip
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as vocab_writer:
             vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
 
-    def get_tokenizers(self, **kwargs) -> List[PreTrainedTokenizerBase]:
-        return [self.get_tokenizer(**kwargs)]
+    def get_tokenizers(cls, **kwargs) -> List[PreTrainedTokenizerBase]:
+        return [cls.get_tokenizer(**kwargs)]
 
-    def get_tokenizer(self, **kwargs) -> PreTrainedTokenizer:
-        return self.tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs) -> PreTrainedTokenizer:
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
     def test_tokenizer_single_example(self):
         tokenizer = self.tokenizer_class(self.vocab_file)

tests/models/fastspeech2_conformer/test_tokenization_fastspeech2_conformer.py

@@ -28,10 +28,11 @@ class FastSpeech2ConformerTokenizerTest(TokenizerTesterMixin, unittest.TestCase)
     tokenizer_class = FastSpeech2ConformerTokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
         tokenizer = FastSpeech2ConformerTokenizer.from_pretrained("espnet/fastspeech2_conformer")
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "this is a test"

tests/models/flaubert/test_tokenization_flaubert.py

@@ -30,8 +30,9 @@ class FlaubertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     tokenizer_class = FlaubertTokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # Adapted from Sennrich et al. 2015 and https://github.com/rsennrich/subword-nmt
         vocab = ["l", "o", "w", "e", "r", "s", "t", "i", "d", "n", "w</w>", "r</w>", "t</w>", "i</w>", "lo", "low", "ne", "new", "er</w>", "low</w>", "lowest</w>", "new</w>", "newer</w>", "wider</w>", "<unk>"]  # fmt: skip
@@ -39,11 +40,11 @@ class FlaubertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["n e 300", "ne w 301", "e r</w> 302", ""]
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
 
     # Copied from transformers.tests.models.xlm.test_tokenization_xlm.XLMTokenizationTest.test_full_tokenizer

tests/models/fnet/test_tokenization_fnet.py

@@ -36,12 +36,13 @@ class FNetTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_sentencepiece_ignore_case = True
     test_seq2seq = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = FNetTokenizer(SAMPLE_VOCAB)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "this is a test"
@@ -147,7 +148,7 @@ class FNetTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 added_tokens = [AddedToken("<special>", lstrip=True)]
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, additional_special_tokens=added_tokens, **kwargs
                 )
                 r_output = tokenizer_r.encode("Hey this is a <special> token")
@@ -175,7 +176,7 @@ class FNetTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 added_tokens = [AddedToken("<special>", lstrip=True)]
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, additional_special_tokens=added_tokens, **kwargs, from_slow=True
                 )
                 special_token_id = tokenizer_r.encode("<special>", add_special_tokens=False)[0]
@@ -198,8 +199,8 @@ class FNetTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 self.assertEqual(tokenizer_p.pad_token_id, tokenizer_r.pad_token_id)
                 pad_token_id = tokenizer_p.pad_token_id

tests/models/fsmt/test_tokenization_fsmt.py

@@ -34,8 +34,9 @@ class FSMTTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     tokenizer_class = FSMTTokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # Adapted from Sennrich et al. 2015 and https://github.com/rsennrich/subword-nmt
         vocab = [
@@ -64,22 +65,22 @@ class FSMTTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["l o 123", "lo w 1456", "e r</w> 1789", ""]
 
-        self.langs = ["en", "ru"]
+        cls.langs = ["en", "ru"]
         config = {
-            "langs": self.langs,
+            "langs": cls.langs,
             "src_vocab_size": 10,
             "tgt_vocab_size": 20,
         }
 
-        self.src_vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["src_vocab_file"])
-        self.tgt_vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["tgt_vocab_file"])
-        config_file = os.path.join(self.tmpdirname, "tokenizer_config.json")
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.src_vocab_file, "w") as fp:
+        cls.src_vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["src_vocab_file"])
+        cls.tgt_vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["tgt_vocab_file"])
+        config_file = os.path.join(cls.tmpdirname, "tokenizer_config.json")
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.src_vocab_file, "w") as fp:
             fp.write(json.dumps(vocab_tokens))
-        with open(self.tgt_vocab_file, "w") as fp:
+        with open(cls.tgt_vocab_file, "w") as fp:
             fp.write(json.dumps(vocab_tokens))
-        with open(self.merges_file, "w") as fp:
+        with open(cls.merges_file, "w") as fp:
             fp.write("\n".join(merges))
         with open(config_file, "w") as fp:
             fp.write(json.dumps(config))

tests/models/funnel/test_tokenization_funnel.py

@@ -16,12 +16,13 @@
 
 import os
 import unittest
+from functools import lru_cache
 
 from transformers import FunnelTokenizer, FunnelTokenizerFast
 from transformers.models.funnel.tokenization_funnel import VOCAB_FILES_NAMES
 from transformers.testing_utils import require_tokenizers
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 @require_tokenizers
@@ -32,8 +33,9 @@ class FunnelTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     space_between_special_tokens = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab_tokens = [
             "<unk>",
@@ -50,15 +52,23 @@ class FunnelTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             "low",
             "lowest",
         ]
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as vocab_writer:
             vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
 
-    def get_tokenizer(self, **kwargs):
-        return FunnelTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return FunnelTokenizer.from_pretrained(pretrained_name, **kwargs)
 
-    def get_rust_tokenizer(self, **kwargs):
-        return FunnelTokenizerFast.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs):
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return FunnelTokenizerFast.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "UNwant\u00e9d,running"

tests/models/gemma/test_tokenization_gemma.py

@@ -53,12 +53,13 @@ class GemmaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_sentencepiece = True
     from_pretrained_kwargs = {}
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
         # We have a SentencePiece fixture for testing
         tokenizer = GemmaTokenizer(SAMPLE_VOCAB, keep_accents=True)
         tokenizer.pad_token = tokenizer.eos_token
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     @require_torch
     def test_batch_tokenization(self):
@@ -103,7 +104,7 @@ class GemmaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 added_tokens = [AddedToken("<special>", lstrip=True)]
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, additional_special_tokens=added_tokens, **kwargs
                 )
                 r_output = tokenizer_r.encode("Hey this is a <special> token")
@@ -113,7 +114,7 @@ class GemmaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                 self.assertTrue(special_token_id in r_output)
 
                 if self.test_slow_tokenizer:
-                    tokenizer_cr = self.rust_tokenizer_class.from_pretrained(
+                    tokenizer_cr = self.get_rust_tokenizer(
                         pretrained_name,
                         additional_special_tokens=added_tokens,
                         **kwargs,  # , from_slow=True <- unfortunately too slow to convert

tests/models/gpt2/test_tokenization_gpt2.py

@@ -17,12 +17,13 @@
 import json
 import os
 import unittest
+from functools import lru_cache
 
 from transformers import AutoTokenizer, GPT2Tokenizer, GPT2TokenizerFast
 from transformers.models.gpt2.tokenization_gpt2 import VOCAB_FILES_NAMES
 from transformers.testing_utils import require_jinja, require_tiktoken, require_tokenizers
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 @require_tokenizers
@@ -34,8 +35,9 @@ class GPT2TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     from_pretrained_kwargs = {"add_prefix_space": True}
     test_seq2seq = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # Adapted from Sennrich et al. 2015 and https://github.com/rsennrich/subword-nmt
         vocab = [
@@ -63,22 +65,30 @@ class GPT2TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         ]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["#version: 0.2", "\u0120 l", "\u0120l o", "\u0120lo w", "e r", ""]
-        self.special_tokens_map = {"unk_token": "<unk>"}
+        cls.special_tokens_map = {"unk_token": "<unk>"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return GPT2Tokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return GPT2Tokenizer.from_pretrained(pretrained_name, **kwargs)
 
-    def get_rust_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return GPT2TokenizerFast.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return GPT2TokenizerFast.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "lower newer"
@@ -135,7 +145,7 @@ class GPT2TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_padding(self, max_length=15):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 # Simple input
                 s = "This is a simple input"

tests/models/gpt_neox_japanese/test_tokenization_gpt_neox_japanese.py

@@ -17,6 +17,7 @@
 import json
 import os
 import unittest
+from functools import lru_cache
 
 from transformers.models.gpt_neox_japanese.tokenization_gpt_neox_japanese import (
     VOCAB_FILES_NAMES,
@@ -24,7 +25,7 @@ from transformers.models.gpt_neox_japanese.tokenization_gpt_neox_japanese import
 )
 from transformers.testing_utils import require_tokenizers, slow
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 @require_tokenizers
@@ -34,8 +35,9 @@ class GPTNeoXJapaneseTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = False
     from_pretrained_kwargs = {"do_clean_text": False, "add_prefix_space": False}
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab_tokens = [
             "こん",
@@ -62,18 +64,22 @@ class GPTNeoXJapaneseTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             "<|endoftext|>",
         ]
         emoji_tokens = {"emoji": {"\ud83d\ude00": "<|emoji1|>"}, "emoji_inv": {"<|emoji1|>": "\ud83d\ude00"}}  # 😀
-        self.special_tokens_map = {"unk_token": "<unk>"}
+        cls.special_tokens_map = {"unk_token": "<unk>"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.emoji_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["emoji_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.emoji_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["emoji_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as vocab_writer:
             vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
-        with open(self.emoji_file, "w") as emoji_writer:
+        with open(cls.emoji_file, "w") as emoji_writer:
             emoji_writer.write(json.dumps(emoji_tokens))
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return GPTNeoXJapaneseTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return GPTNeoXJapaneseTokenizer.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "こんにちは、世界。 \nこんばんは、㔺界。😀"

tests/models/gpt_sw3/test_tokenization_gpt_sw3.py

@@ -33,13 +33,14 @@ class GPTSw3TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_sentencepiece = True
     test_sentencepiece_ignore_case = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = GPTSw3Tokenizer(SAMPLE_VOCAB, eos_token="<unk>", bos_token="<unk>", pad_token="<unk>")
 
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "This is a test"

tests/models/herbert/test_tokenization_herbert.py

@@ -33,12 +33,13 @@ class HerbertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     rust_tokenizer_class = HerbertTokenizerFast
     test_rust_tokenizer = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # Use a simpler test file without japanese/chinese characters
         with open(f"{get_tests_dir()}/fixtures/sample_text_no_unicode.txt", encoding="utf-8") as f_data:
-            self._data = f_data.read().replace("\n\n", "\n").strip()
+            cls._data = f_data.read().replace("\n\n", "\n").strip()
 
         vocab = [
             "<s>",
@@ -69,11 +70,11 @@ class HerbertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["l o 123", "lo w 1456", "e r</w> 1789", ""]
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w") as fp:
             fp.write(json.dumps(vocab_tokens))
-        with open(self.merges_file, "w") as fp:
+        with open(cls.merges_file, "w") as fp:
             fp.write("\n".join(merges))
 
     def get_input_output_texts(self, tokenizer):

tests/models/layoutlm/test_tokenization_layoutlm.py

@@ -16,12 +16,13 @@
 
 import os
 import unittest
+from functools import lru_cache
 
 from transformers import LayoutLMTokenizer, LayoutLMTokenizerFast
 from transformers.models.layoutlm.tokenization_layoutlm import VOCAB_FILES_NAMES
 from transformers.testing_utils import require_tokenizers
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 @require_tokenizers
@@ -32,8 +33,9 @@ class LayoutLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     space_between_special_tokens = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab_tokens = [
             "[UNK]",
@@ -50,12 +52,16 @@ class LayoutLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             "low",
             "lowest",
         ]
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as vocab_writer:
             vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
 
-    def get_tokenizer(self, **kwargs):
-        return LayoutLMTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return LayoutLMTokenizer.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "UNwant\u00e9d,running"

tests/models/layoutlmv2/test_tokenization_layoutlmv2.py

@@ -102,8 +102,9 @@ class LayoutLMv2TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
         return questions, words, boxes
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab_tokens = [
             "[UNK]",
@@ -122,8 +123,8 @@ class LayoutLMv2TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             "test",
             "lowest",
         ]
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as vocab_writer:
             vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
 
     def get_input_output_texts(self, tokenizer):
@@ -267,7 +268,7 @@ class LayoutLMv2TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_offsets_with_special_characters(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 words, boxes = self.get_words_and_boxes()
                 words[1] = tokenizer_r.mask_token
@@ -605,8 +606,8 @@ class LayoutLMv2TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_padding(self, max_length=50):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 self.assertEqual(tokenizer_p.pad_token_id, tokenizer_r.pad_token_id)
                 pad_token_id = tokenizer_p.pad_token_id
@@ -1060,7 +1061,7 @@ class LayoutLMv2TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 # Input tokens id
                 words, boxes = self.get_words_and_boxes()
@@ -1363,7 +1364,7 @@ class LayoutLMv2TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 words, boxes = self.get_words_and_boxes()
 
@@ -1417,7 +1418,7 @@ class LayoutLMv2TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 words, boxes = self.get_words_and_boxes()
                 tokens_r = tokenizer_r.encode_plus(
                     words,
@@ -1715,7 +1716,7 @@ class LayoutLMv2TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 self.assertEqual(tokenizer_p.pad_token_id, tokenizer_r.pad_token_id)
                 pad_token_id = tokenizer_p.pad_token_id
 

tests/models/layoutlmv3/test_tokenization_layoutlmv3.py

@@ -20,6 +20,7 @@ import re
 import shutil
 import tempfile
 import unittest
+from functools import lru_cache
 from typing import List
 
 from parameterized import parameterized
@@ -41,7 +42,12 @@ from transformers.testing_utils import (
     slow,
 )
 
-from ...test_tokenization_common import SMALL_TRAINING_CORPUS, TokenizerTesterMixin, merge_model_tokenizer_mappings
+from ...test_tokenization_common import (
+    SMALL_TRAINING_CORPUS,
+    TokenizerTesterMixin,
+    merge_model_tokenizer_mappings,
+    use_cache_if_possible,
+)
 
 
 logger = logging.get_logger(__name__)
@@ -91,8 +97,9 @@ class LayoutLMv3TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
         return questions, words, boxes
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # Adapted from Sennrich et al. 2015 and https://github.com/rsennrich/subword-nmt
         vocab = [
@@ -119,22 +126,30 @@ class LayoutLMv3TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         ]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["#version: 0.2", "\u0120 l", "\u0120l o", "\u0120lo w", "e r", ""]
-        self.special_tokens_map = {"unk_token": "<unk>"}
+        cls.special_tokens_map = {"unk_token": "<unk>"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return self.tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
-    def get_rust_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return LayoutLMv3TokenizerFast.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return LayoutLMv3TokenizerFast.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "lower newer"
@@ -485,8 +500,8 @@ class LayoutLMv3TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_padding(self, max_length=50):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 self.assertEqual(tokenizer_p.pad_token_id, tokenizer_r.pad_token_id)
                 pad_token_id = tokenizer_p.pad_token_id
@@ -940,7 +955,7 @@ class LayoutLMv3TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 # Input tokens id
                 words, boxes = self.get_words_and_boxes()
@@ -1241,7 +1256,7 @@ class LayoutLMv3TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 words, boxes = self.get_words_and_boxes()
 
@@ -1295,7 +1310,7 @@ class LayoutLMv3TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 words, boxes = self.get_words_and_boxes()
                 tokens_r = tokenizer_r.encode_plus(
                     words,
@@ -1593,7 +1608,7 @@ class LayoutLMv3TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 self.assertEqual(tokenizer_p.pad_token_id, tokenizer_r.pad_token_id)
                 pad_token_id = tokenizer_p.pad_token_id
 

tests/models/layoutxlm/test_tokenization_layoutxlm.py

@@ -96,12 +96,13 @@ class LayoutXLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
         return questions, words, boxes
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = LayoutXLMTokenizer(SAMPLE_VOCAB, keep_accents=True)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "UNwant\u00e9d,running"
@@ -157,7 +158,7 @@ class LayoutXLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             _, _, boxes = self.get_question_words_and_boxes()
 
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_rust = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_rust = self.get_rust_tokenizer(
                     pretrained_name, additional_special_tokens=[special_token], split_special_tokens=True, **kwargs
                 )
                 tokenizer_py = self.tokenizer_class.from_pretrained(
@@ -206,7 +207,7 @@ class LayoutXLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_offsets_with_special_characters(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 words, boxes = self.get_words_and_boxes()
                 words[1] = tokenizer_r.mask_token
@@ -536,8 +537,8 @@ class LayoutXLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_padding(self, max_length=50):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 self.assertEqual(tokenizer_p.pad_token_id, tokenizer_r.pad_token_id)
                 pad_token_id = tokenizer_p.pad_token_id
@@ -990,8 +991,8 @@ class LayoutXLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 # Input tokens id
                 words, boxes = self.get_words_and_boxes()
@@ -1292,7 +1293,7 @@ class LayoutXLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 words, boxes = self.get_words_and_boxes()
 
@@ -1346,7 +1347,7 @@ class LayoutXLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 words, boxes = self.get_words_and_boxes()
                 tokens_r = tokenizer_r.encode_plus(
                     words,
@@ -1644,7 +1645,7 @@ class LayoutXLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 self.assertEqual(tokenizer_p.pad_token_id, tokenizer_r.pad_token_id)
                 pad_token_id = tokenizer_p.pad_token_id
 
@@ -1743,7 +1744,7 @@ class LayoutXLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 tmpdirname2 = tempfile.mkdtemp()
 

tests/models/led/test_tokenization_led.py

@@ -14,13 +14,14 @@
 import json
 import os
 import unittest
+from functools import lru_cache
 
 from transformers import BatchEncoding, LEDTokenizer, LEDTokenizerFast
 from transformers.models.led.tokenization_led import VOCAB_FILES_NAMES
 from transformers.testing_utils import require_tokenizers, require_torch
 from transformers.utils import cached_property
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 @require_tokenizers
@@ -30,8 +31,10 @@ class TestTokenizationLED(TokenizerTesterMixin, unittest.TestCase):
     rust_tokenizer_class = LEDTokenizerFast
     test_rust_tokenizer = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+
         vocab = [
             "l",
             "o",
@@ -56,22 +59,30 @@ class TestTokenizationLED(TokenizerTesterMixin, unittest.TestCase):
         ]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["#version: 0.2", "\u0120 l", "\u0120l o", "\u0120lo w", "e r", ""]
-        self.special_tokens_map = {"unk_token": "<unk>"}
+        cls.special_tokens_map = {"unk_token": "<unk>"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return self.tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
-    def get_rust_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return self.rust_tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         return "lower newer", "lower newer"
@@ -161,8 +172,8 @@ class TestTokenizationLED(TokenizerTesterMixin, unittest.TestCase):
     def test_embeded_special_tokens(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 sentence = "A, <mask> AllenNLP sentence."
                 tokens_r = tokenizer_r.encode_plus(sentence, add_special_tokens=True, return_token_type_ids=True)
                 tokens_p = tokenizer_p.encode_plus(sentence, add_special_tokens=True, return_token_type_ids=True)

tests/models/llama/test_tokenization_llama.py

@@ -60,13 +60,14 @@ class LlamaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_sentencepiece = True
     from_pretrained_kwargs = {}
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = LlamaTokenizer(SAMPLE_VOCAB, keep_accents=True)
         tokenizer.pad_token = tokenizer.eos_token
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def get_tokenizers(self, **kwargs):
         kwargs.update({"pad_token": "<PAD>"})
@@ -149,8 +150,8 @@ class LlamaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         self.tokenizers_list += (self.rust_tokenizer_class, "hf-internal-testing/llama-tokenizer", {})
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 tmpdirname2 = tempfile.mkdtemp()
 
@@ -253,7 +254,7 @@ class LlamaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 added_tokens = [AddedToken("<special>", lstrip=True)]
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, additional_special_tokens=added_tokens, **kwargs
                 )
                 r_output = tokenizer_r.encode("Hey this is a <special> token")
@@ -263,7 +264,7 @@ class LlamaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                 self.assertTrue(special_token_id in r_output)
 
                 if self.test_slow_tokenizer:
-                    tokenizer_cr = self.rust_tokenizer_class.from_pretrained(
+                    tokenizer_cr = self.get_rust_tokenizer(
                         pretrained_name,
                         additional_special_tokens=added_tokens,
                         **kwargs,  # , from_slow=True <- unfortunately too slow to convert
@@ -313,8 +314,8 @@ class LlamaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         EXPECTED_WITH_SPACE = [1, 18637, 920, 526, 366, 2599]
         EXPECTED_WO_SPACE = [1, 29950, 1032, 920, 526, 366, 2599]
 
-        slow_ = self.tokenizer_class.from_pretrained(pretrained_name, add_prefix_space=False, legacy=False)
-        fast_ = self.rust_tokenizer_class.from_pretrained(pretrained_name, add_prefix_space=False, legacy=False)
+        slow_ = self.get_tokenizer(pretrained_name, add_prefix_space=False, legacy=False)
+        fast_ = self.get_rust_tokenizer(pretrained_name, add_prefix_space=False, legacy=False)
         self.assertEqual(slow_.encode(inputs), EXPECTED_WO_SPACE)
         self.assertEqual(slow_.encode(inputs), fast_.encode(inputs))
         self.assertEqual(slow_.tokenize(inputs), ["H", "ey", "▁how", "▁are", "▁you", "▁doing"])
@@ -324,8 +325,8 @@ class LlamaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             fast_.decode(EXPECTED_WO_SPACE, skip_special_tokens=True),
         )
 
-        slow_ = self.tokenizer_class.from_pretrained(pretrained_name, add_prefix_space=True, legacy=False)
-        fast_ = self.rust_tokenizer_class.from_pretrained(pretrained_name, add_prefix_space=True, legacy=False)
+        slow_ = self.get_tokenizer(pretrained_name, add_prefix_space=True, legacy=False)
+        fast_ = self.get_rust_tokenizer(pretrained_name, add_prefix_space=True, legacy=False)
         self.assertEqual(slow_.encode(inputs), EXPECTED_WITH_SPACE)
         self.assertEqual(slow_.encode(inputs), fast_.encode(inputs))
         self.assertEqual(slow_.tokenize(inputs), ["▁Hey", "▁how", "▁are", "▁you", "▁doing"])

tests/models/longformer/test_tokenization_longformer.py

@@ -18,12 +18,13 @@ import itertools
 import json
 import os
 import unittest
+from functools import lru_cache
 
 from transformers import AddedToken, LongformerTokenizer, LongformerTokenizerFast
 from transformers.models.longformer.tokenization_longformer import VOCAB_FILES_NAMES
 from transformers.testing_utils import require_tokenizers, slow
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 @require_tokenizers
@@ -36,8 +37,9 @@ class LongformerTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     rust_tokenizer_class = LongformerTokenizerFast
     test_rust_tokenizer = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # Adapted from Sennrich et al. 2015 and https://github.com/rsennrich/subword-nmt
         vocab = [
@@ -64,22 +66,30 @@ class LongformerTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         ]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["#version: 0.2", "\u0120 l", "\u0120l o", "\u0120lo w", "e r", ""]
-        self.special_tokens_map = {"unk_token": "<unk>"}
+        cls.special_tokens_map = {"unk_token": "<unk>"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return self.tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
-    def get_rust_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return self.rust_tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "lower newer"
@@ -173,8 +183,8 @@ class LongformerTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_embeded_special_tokens(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 sentence = "A, <mask> AllenNLP sentence."
                 tokens_r = tokenizer_r.encode_plus(sentence, add_special_tokens=True, return_token_type_ids=True)
                 tokens_p = tokenizer_p.encode_plus(sentence, add_special_tokens=True, return_token_type_ids=True)
@@ -204,7 +214,7 @@ class LongformerTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
     def test_change_add_prefix_space_and_trim_offsets_args(self):
         for trim_offsets, add_prefix_space in itertools.product([True, False], repeat=2):
-            tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+            tokenizer_r = self.get_rust_tokenizer(
                 self.tmpdirname, use_fast=True, add_prefix_space=add_prefix_space, trim_offsets=trim_offsets
             )
 
@@ -224,7 +234,7 @@ class LongformerTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                 text_of_1_token = "hello"  # `hello` is a token in the vocabulary of `pretrained_name`
                 text = f"{text_of_1_token} {text_of_1_token}"
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, use_fast=True, add_prefix_space=True, trim_offsets=True
                 )
                 encoding = tokenizer_r(text, return_offsets_mapping=True, add_special_tokens=False)
@@ -234,7 +244,7 @@ class LongformerTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                     (len(text_of_1_token) + 1, len(text_of_1_token) + 1 + len(text_of_1_token)),
                 )
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, use_fast=True, add_prefix_space=False, trim_offsets=True
                 )
                 encoding = tokenizer_r(text, return_offsets_mapping=True, add_special_tokens=False)
@@ -244,7 +254,7 @@ class LongformerTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                     (len(text_of_1_token) + 1, len(text_of_1_token) + 1 + len(text_of_1_token)),
                 )
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, use_fast=True, add_prefix_space=True, trim_offsets=False
                 )
                 encoding = tokenizer_r(text, return_offsets_mapping=True, add_special_tokens=False)
@@ -254,7 +264,7 @@ class LongformerTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                     (len(text_of_1_token), len(text_of_1_token) + 1 + len(text_of_1_token)),
                 )
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, use_fast=True, add_prefix_space=False, trim_offsets=False
                 )
                 encoding = tokenizer_r(text, return_offsets_mapping=True, add_special_tokens=False)
@@ -276,7 +286,7 @@ class LongformerTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                 #     (1 + len(text_of_1_token) + 1, 1 + len(text_of_1_token) + 1 + len(text_of_1_token)),
                 # )
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, use_fast=True, add_prefix_space=False, trim_offsets=True
                 )
                 encoding = tokenizer_r(text, return_offsets_mapping=True, add_special_tokens=False)
@@ -286,7 +296,7 @@ class LongformerTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                     (1 + len(text_of_1_token) + 1, 1 + len(text_of_1_token) + 1 + len(text_of_1_token)),
                 )
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, use_fast=True, add_prefix_space=True, trim_offsets=False
                 )
                 encoding = tokenizer_r(text, return_offsets_mapping=True, add_special_tokens=False)
@@ -296,7 +306,7 @@ class LongformerTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                     (1 + len(text_of_1_token), 1 + len(text_of_1_token) + 1 + len(text_of_1_token)),
                 )
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, use_fast=True, add_prefix_space=False, trim_offsets=False
                 )
                 encoding = tokenizer_r(text, return_offsets_mapping=True, add_special_tokens=False)

tests/models/luke/test_tokenization_luke.py

@@ -14,12 +14,13 @@
 # limitations under the License.
 
 import unittest
+from functools import lru_cache
 from typing import Tuple
 
 from transformers import AddedToken, LukeTokenizer
 from transformers.testing_utils import get_tests_dir, require_torch, slow
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 SAMPLE_VOCAB = get_tests_dir("fixtures/vocab.json")
@@ -33,13 +34,17 @@ class LukeTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = False
     from_pretrained_kwargs = {"cls_token": "<s>"}
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
-        self.special_tokens_map = {"entity_token_1": "<ent>", "entity_token_2": "<ent2>"}
+        cls.special_tokens_map = {"entity_token_1": "<ent>", "entity_token_2": "<ent2>"}
 
-    def get_tokenizer(self, task=None, **kwargs):
-        kwargs.update(self.special_tokens_map)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, task=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
         tokenizer = LukeTokenizer(
             vocab_file=SAMPLE_VOCAB,
             merges_file=SAMPLE_MERGE_FILE,
@@ -137,8 +142,8 @@ class LukeTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
     def test_embeded_special_tokens(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest("{} ({})".format(tokenizer.__class__.__name__, pretrained_name)):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 sentence = "A, <mask> AllenNLP sentence."
                 tokens_r = tokenizer_r.encode_plus(sentence, add_special_tokens=True, return_token_type_ids=True)
                 tokens_p = tokenizer_p.encode_plus(sentence, add_special_tokens=True, return_token_type_ids=True)

tests/models/lxmert/test_tokenization_lxmert.py

@@ -32,8 +32,9 @@ class LxmertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     space_between_special_tokens = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab_tokens = [
             "[UNK]",
@@ -50,8 +51,8 @@ class LxmertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             "low",
             "lowest",
         ]
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as vocab_writer:
             vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
 
     def get_input_output_texts(self, tokenizer):

tests/models/m2m_100/test_tokenization_m2m_100.py

@@ -14,6 +14,7 @@
 
 import tempfile
 import unittest
+from functools import lru_cache
 from pathlib import Path
 from shutil import copyfile
 
@@ -32,7 +33,7 @@ from transformers.utils import is_sentencepiece_available
 if is_sentencepiece_available():
     from transformers.models.m2m_100.tokenization_m2m_100 import VOCAB_FILES_NAMES, save_json
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 if is_sentencepiece_available():
@@ -54,21 +55,26 @@ class M2M100TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_seq2seq = False
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab = ["</s>", "<unk>", "▁This", "▁is", "▁a", "▁t", "est", "\u0120", "<pad>"]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
-        save_dir = Path(self.tmpdirname)
+        save_dir = Path(cls.tmpdirname)
         save_json(vocab_tokens, save_dir / VOCAB_FILES_NAMES["vocab_file"])
         if not (save_dir / VOCAB_FILES_NAMES["spm_file"]).exists():
             copyfile(SAMPLE_SP, save_dir / VOCAB_FILES_NAMES["spm_file"])
 
-        tokenizer = M2M100Tokenizer.from_pretrained(self.tmpdirname)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer = M2M100Tokenizer.from_pretrained(cls.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
-    def get_tokenizer(self, **kwargs):
-        return M2M100Tokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return M2M100Tokenizer.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         return (

tests/models/marian/test_tokenization_marian.py

@@ -15,6 +15,7 @@
 
 import tempfile
 import unittest
+from functools import lru_cache
 from pathlib import Path
 from shutil import copyfile
 
@@ -26,7 +27,7 @@ from transformers.utils import is_sentencepiece_available, is_tf_available, is_t
 if is_sentencepiece_available():
     from transformers.models.marian.tokenization_marian import VOCAB_FILES_NAMES, save_json
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 SAMPLE_SP = get_tests_dir("fixtures/test_sentencepiece.model")
@@ -50,22 +51,28 @@ class MarianTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = False
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+
         vocab = ["</s>", "<unk>", "▁This", "▁is", "▁a", "▁t", "est", "\u0120", "<pad>"]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
-        save_dir = Path(self.tmpdirname)
+        save_dir = Path(cls.tmpdirname)
         save_json(vocab_tokens, save_dir / VOCAB_FILES_NAMES["vocab"])
         save_json(mock_tokenizer_config, save_dir / VOCAB_FILES_NAMES["tokenizer_config_file"])
         if not (save_dir / VOCAB_FILES_NAMES["source_spm"]).exists():
             copyfile(SAMPLE_SP, save_dir / VOCAB_FILES_NAMES["source_spm"])
             copyfile(SAMPLE_SP, save_dir / VOCAB_FILES_NAMES["target_spm"])
 
-        tokenizer = MarianTokenizer.from_pretrained(self.tmpdirname)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer = MarianTokenizer.from_pretrained(cls.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
-    def get_tokenizer(self, **kwargs) -> MarianTokenizer:
-        return MarianTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs) -> MarianTokenizer:
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return MarianTokenizer.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         return (

tests/models/markuplm/test_tokenization_markuplm.py

@@ -50,26 +50,27 @@ class MarkupLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     from_pretrained_kwargs = {"cls_token": "<s>"}
     test_seq2seq = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # Adapted from Sennrich et al. 2015 and https://github.com/rsennrich/subword-nmt
         vocab = ["l", "o", "w", "e", "r", "s", "t", "i", "d", "n", "\u0120", "\u0120l", "\u0120n", "\u0120lo", "\u0120low", "er", "\u0120lowest", "\u0120newer", "\u0120wider", "\u0120hello", "\u0120world", "<unk>",]  # fmt: skip
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["#version: 0.2", "\u0120 l", "\u0120l o", "\u0120lo w", "e r", ""]
-        self.tags_dict = {"a": 0, "abbr": 1, "acronym": 2, "address": 3}
-        self.special_tokens_map = {"unk_token": "<unk>"}
+        cls.tags_dict = {"a": 0, "abbr": 1, "acronym": 2, "address": 3}
+        cls.special_tokens_map = {"unk_token": "<unk>"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        self.tokenizer_config_file = os.path.join(self.tmpdirname, "tokenizer_config.json")
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        cls.tokenizer_config_file = os.path.join(cls.tmpdirname, "tokenizer_config.json")
 
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
-        with open(self.tokenizer_config_file, "w", encoding="utf-8") as fp:
-            fp.write(json.dumps({"tags_dict": self.tags_dict}))
+        with open(cls.tokenizer_config_file, "w", encoding="utf-8") as fp:
+            fp.write(json.dumps({"tags_dict": cls.tags_dict}))
 
     def get_nodes_and_xpaths(self):
         nodes = ["hello", "world"]
@@ -421,8 +422,8 @@ class MarkupLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_padding(self, max_length=50):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 self.assertEqual(tokenizer_p.pad_token_id, tokenizer_r.pad_token_id)
                 pad_token_id = tokenizer_p.pad_token_id
@@ -828,8 +829,8 @@ class MarkupLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 # Input tokens id
                 nodes, xpaths = self.get_nodes_and_xpaths()
@@ -1010,7 +1011,7 @@ class MarkupLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_offsets_mapping(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 text = ["a", "wonderful", "test"]
                 xpaths = ["html/body" for _ in range(len(text))]
@@ -1125,7 +1126,7 @@ class MarkupLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 nodes, xpaths = self.get_nodes_and_xpaths()
 
@@ -1187,7 +1188,7 @@ class MarkupLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 nodes, xpaths = self.get_nodes_and_xpaths()
                 tokens_r = tokenizer_r.encode_plus(nodes, xpaths=xpaths, add_special_tokens=True)
                 tokens_p = tokenizer_p.encode_plus(nodes, xpaths=xpaths, add_special_tokens=True)
@@ -1490,7 +1491,7 @@ class MarkupLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 self.assertEqual(tokenizer_p.pad_token_id, tokenizer_r.pad_token_id)
                 pad_token_id = tokenizer_p.pad_token_id
 

tests/models/mbart/test_tokenization_mbart.py

@@ -47,12 +47,13 @@ class MBartTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = MBartTokenizer(SAMPLE_VOCAB, keep_accents=True)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def test_full_tokenizer(self):
         tokenizer = MBartTokenizer(SAMPLE_VOCAB, keep_accents=True)
@@ -139,8 +140,8 @@ class MBartTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         self.tokenizers_list[0] = (self.rust_tokenizer_class, "hf-internal-testing/tiny-random-mbart", {})
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 tmpdirname2 = tempfile.mkdtemp()
 

tests/models/mbart50/test_tokenization_mbart50.py

@@ -47,12 +47,13 @@ class MBart50TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = MBart50Tokenizer(SAMPLE_VOCAB, src_lang="en_XX", tgt_lang="ro_RO", keep_accents=True)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def test_convert_token_and_id(self):
         """Test ``_convert_token_to_id`` and ``_convert_id_to_token``."""
@@ -117,8 +118,8 @@ class MBart50TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         self.tokenizers_list[0] = (self.rust_tokenizer_class, "hf-internal-testing/tiny-random-mbart50", {})
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 tmpdirname2 = tempfile.mkdtemp()
 

tests/models/mgp_str/test_tokenization_mgp_str.py

@@ -17,12 +17,13 @@
 import json
 import os
 import unittest
+from functools import lru_cache
 
 from transformers import MgpstrTokenizer
 from transformers.models.mgp_str.tokenization_mgp_str import VOCAB_FILES_NAMES
 from transformers.testing_utils import require_tokenizers
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 @require_tokenizers
@@ -33,18 +34,23 @@ class MgpstrTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     from_pretrained_kwargs = {}
     test_seq2seq = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab = ['[GO]', '[s]', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']  # fmt: skip
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
 
-    def get_tokenizer(self, **kwargs):
-        return MgpstrTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return MgpstrTokenizer.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "tester"

tests/models/mluke/test_tokenization_mluke.py

@@ -15,12 +15,13 @@
 
 
 import unittest
+from functools import lru_cache
 from typing import Tuple
 
 from transformers.models.mluke.tokenization_mluke import MLukeTokenizer
 from transformers.testing_utils import get_tests_dir, require_torch, slow
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 SAMPLE_VOCAB = get_tests_dir("fixtures/test_sentencepiece.model")
@@ -33,13 +34,17 @@ class MLukeTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = False
     from_pretrained_kwargs = {"cls_token": "<s>"}
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
-        self.special_tokens_map = {"entity_token_1": "<ent>", "entity_token_2": "<ent2>"}
+        cls.special_tokens_map = {"entity_token_1": "<ent>", "entity_token_2": "<ent2>"}
 
-    def get_tokenizer(self, task=None, **kwargs):
-        kwargs.update(self.special_tokens_map)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, task=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
         kwargs.update({"task": task})
         tokenizer = MLukeTokenizer(vocab_file=SAMPLE_VOCAB, entity_vocab_file=SAMPLE_ENTITY_VOCAB, **kwargs)
         return tokenizer
@@ -100,8 +105,8 @@ class MLukeTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
     def test_embeded_special_tokens(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest("{} ({})".format(tokenizer.__class__.__name__, pretrained_name)):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 sentence = "A, <mask> AllenNLP sentence."
                 tokens_r = tokenizer_r.encode_plus(sentence, add_special_tokens=True, return_token_type_ids=True)
                 tokens_p = tokenizer_p.encode_plus(sentence, add_special_tokens=True, return_token_type_ids=True)

tests/models/mobilebert/test_tokenization_mobilebert.py

@@ -41,8 +41,9 @@ class MobileBERTTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     from_pretrained_filter = filter_non_english
     pre_trained_model_path = "google/mobilebert-uncased"
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab_tokens = [
             "[UNK]",
@@ -61,13 +62,13 @@ class MobileBERTTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             "low",
             "lowest",
         ]
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as vocab_writer:
             vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
 
-        self.tokenizers_list = [
-            (tokenizer_def[0], self.pre_trained_model_path, tokenizer_def[2])  # else the 'google/' prefix is stripped
-            for tokenizer_def in self.tokenizers_list
+        cls.tokenizers_list = [
+            (tokenizer_def[0], cls.pre_trained_model_path, tokenizer_def[2])  # else the 'google/' prefix is stripped
+            for tokenizer_def in cls.tokenizers_list
         ]
 
     # Copied from tests.models.bert.test_tokenization_bert.BertTokenizationTest.get_input_output_texts
@@ -275,7 +276,7 @@ class MobileBERTTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_offsets_with_special_characters(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 sentence = f"A, naïve {tokenizer_r.mask_token} AllenNLP sentence."
                 tokens = tokenizer_r.encode_plus(
@@ -331,8 +332,8 @@ class MobileBERTTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 kwargs["tokenize_chinese_chars"] = True
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 ids_without_spe_char_p = tokenizer_p.encode(text_with_chinese_char, add_special_tokens=False)
                 ids_without_spe_char_r = tokenizer_r.encode(text_with_chinese_char, add_special_tokens=False)
@@ -345,8 +346,8 @@ class MobileBERTTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                 self.assertListEqual(tokens_without_spe_char_r, list_of_commun_chinese_char)
 
                 kwargs["tokenize_chinese_chars"] = False
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 ids_without_spe_char_r = tokenizer_r.encode(text_with_chinese_char, add_special_tokens=False)
                 ids_without_spe_char_p = tokenizer_p.encode(text_with_chinese_char, add_special_tokens=False)

tests/models/moshi/test_tokenization_moshi.py

@@ -51,8 +51,9 @@ class MoshiTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     from_pretrained_kwargs = {}
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = PreTrainedTokenizerFast(
@@ -62,10 +63,11 @@ class MoshiTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             eos_token="</s>",
         )
         tokenizer.pad_token = tokenizer.eos_token
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
-    def get_rust_tokenizer(self, **kwargs) -> PreTrainedTokenizerFast:
-        return self.rust_tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs) -> PreTrainedTokenizerFast:
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
     @unittest.skip(reason="No slow tokenizer")
     def test_added_tokens_serialization(self):

tests/models/mpnet/test_tokenization_mpnet.py

@@ -32,8 +32,9 @@ class MPNetTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     space_between_special_tokens = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab_tokens = [
             "[UNK]",
@@ -52,8 +53,8 @@ class MPNetTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
             "low",
             "lowest",
         ]
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as vocab_writer:
             vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
 
     def get_input_output_texts(self, tokenizer):

tests/models/mvp/test_tokenization_mvp.py

@@ -14,13 +14,14 @@
 import json
 import os
 import unittest
+from functools import lru_cache
 
 from transformers import BatchEncoding, MvpTokenizer, MvpTokenizerFast
 from transformers.models.roberta.tokenization_roberta import VOCAB_FILES_NAMES
 from transformers.testing_utils import require_tokenizers, require_torch
 from transformers.utils import cached_property
 
-from ...test_tokenization_common import TokenizerTesterMixin, filter_roberta_detectors
+from ...test_tokenization_common import TokenizerTesterMixin, filter_roberta_detectors, use_cache_if_possible
 
 
 @require_tokenizers
@@ -32,8 +33,10 @@ class TestTokenizationMvp(TokenizerTesterMixin, unittest.TestCase):
     from_pretrained_filter = filter_roberta_detectors
     # from_pretrained_kwargs = {'add_prefix_space': True}
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+
         vocab = [
             "l",
             "o",
@@ -58,22 +61,30 @@ class TestTokenizationMvp(TokenizerTesterMixin, unittest.TestCase):
         ]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["#version: 0.2", "\u0120 l", "\u0120l o", "\u0120lo w", "e r", ""]
-        self.special_tokens_map = {"unk_token": "<unk>"}
+        cls.special_tokens_map = {"unk_token": "<unk>"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return self.tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
-    def get_rust_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return self.rust_tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         return "lower newer", "lower newer"
@@ -153,8 +164,8 @@ class TestTokenizationMvp(TokenizerTesterMixin, unittest.TestCase):
     def test_embeded_special_tokens(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 sentence = "A, <mask> AllenNLP sentence."
                 tokens_r = tokenizer_r.encode_plus(sentence, add_special_tokens=True, return_token_type_ids=True)
                 tokens_p = tokenizer_p.encode_plus(sentence, add_special_tokens=True, return_token_type_ids=True)

tests/models/myt5/test_tokenization_myt5.py

@@ -16,6 +16,7 @@ import binascii
 import unittest
 
 from transformers import MyT5Tokenizer
+from transformers.testing_utils import slow
 from transformers.utils import is_tf_available, is_torch_available
 
 from ...test_tokenization_common import TokenizerTesterMixin
@@ -86,15 +87,14 @@ class TestByteRewriter(unittest.TestCase):
         self.assertEqual(decompose_rewriter.rewrite_bytes(in_hex), out_hex)
 
 
+# This is way too slow, let's not run it on CircleCI. When trying to use cache, we get OOM and worker(s) crashed.
+@slow
 class MyT5TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     tokenizer_class = MyT5Tokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
-
-    def get_tokenizer(self, **kwargs) -> MyT5Tokenizer:
-        return self.tokenizer_class.from_pretrained("Tomlim/myt5-base", **kwargs)
+    def get_tokenizer(cls, **kwargs) -> MyT5Tokenizer:
+        return cls.tokenizer_class.from_pretrained("Tomlim/myt5-base", **kwargs)
 
     @unittest.skip(reason="inputs cannot be pretokenized as ids depend on whole input string")
     def test_pretokenized_inputs(self):

tests/models/nllb/test_tokenization_nllb.py

@@ -56,12 +56,13 @@ class NllbTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_sentencepiece = True
     from_pretrained_kwargs = {}
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = NllbTokenizer(SAMPLE_VOCAB, keep_accents=True)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def test_full_tokenizer(self):
         tokenizer = NllbTokenizer(SAMPLE_VOCAB, keep_accents=True)
@@ -143,8 +144,8 @@ class NllbTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         self.tokenizers_list[0] = (self.rust_tokenizer_class, "hf-internal-testing/tiny-random-nllb", {})
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 tmpdirname2 = tempfile.mkdtemp()
 
@@ -262,7 +263,7 @@ class NllbTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 added_tokens = [AddedToken("<special>", lstrip=True)]
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, additional_special_tokens=added_tokens, **kwargs
                 )
                 r_output = tokenizer_r.encode("Hey this is a <special> token")
@@ -272,7 +273,7 @@ class NllbTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                 self.assertTrue(special_token_id in r_output)
 
                 if self.test_slow_tokenizer:
-                    tokenizer_cr = self.rust_tokenizer_class.from_pretrained(
+                    tokenizer_cr = self.get_rust_tokenizer(
                         pretrained_name,
                         additional_special_tokens=added_tokens,
                         **kwargs,  # , from_slow=True <- unfortunately too slow to convert

tests/models/nougat/test_tokenization_nougat.py

@@ -13,13 +13,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import copy
 import unittest
+from functools import lru_cache
 
 from transformers import NougatTokenizerFast
 from transformers.models.nougat.tokenization_nougat_fast import markdown_compatible, normalize_list_like_lines
 from transformers.testing_utils import require_levenshtein, require_nltk, require_tokenizers
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 @require_tokenizers
@@ -33,19 +35,26 @@ class NougatTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     from_pretrained_vocab_key = "tokenizer_file"
     special_tokens_map = {"bos_token": "<s>", "eos_token": "</s>", "unk_token": "<unk>", "pad_token": "<pad>"}
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
         tokenizer = NougatTokenizerFast.from_pretrained("facebook/nougat-base")
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
-    def get_rust_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return NougatTokenizerFast.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs):
+        _kwargs = copy.deepcopy(cls.special_tokens_map)
+        _kwargs.update(kwargs)
+        kwargs = _kwargs
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return NougatTokenizerFast.from_pretrained(pretrained_name, **kwargs)
 
     def test_padding(self, max_length=6):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
                 # Simple input
                 sentence1 = "This is a simple input"
                 sentence2 = ["This is a simple input 1", "This is a simple input 2"]

tests/models/openai/test_tokenization_openai.py

@@ -35,8 +35,9 @@ class OpenAIGPTTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     test_seq2seq = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # Adapted from Sennrich et al. 2015 and https://github.com/rsennrich/subword-nmt
         vocab = [
@@ -65,11 +66,11 @@ class OpenAIGPTTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["#version: 0.2", "l o", "lo w", "e r</w>", ""]
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w") as fp:
             fp.write(json.dumps(vocab_tokens))
-        with open(self.merges_file, "w") as fp:
+        with open(cls.merges_file, "w") as fp:
             fp.write("\n".join(merges))
 
     def get_input_output_texts(self, tokenizer):
@@ -90,7 +91,7 @@ class OpenAIGPTTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_padding(self, max_length=15):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 # Simple input
                 s = "This is a simple input"

tests/models/pegasus/test_tokenization_pegasus.py

@@ -13,12 +13,13 @@
 # limitations under the License.
 
 import unittest
+from functools import lru_cache
 
 from transformers import PegasusTokenizer, PegasusTokenizerFast
 from transformers.testing_utils import get_tests_dir, require_sentencepiece, require_tokenizers, require_torch, slow
 from transformers.utils import cached_property
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 SAMPLE_VOCAB = get_tests_dir("fixtures/test_sentencepiece_no_bos.model")
@@ -33,19 +34,24 @@ class PegasusTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = PegasusTokenizer(SAMPLE_VOCAB)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     @cached_property
     def _large_tokenizer(self):
         return PegasusTokenizer.from_pretrained("google/pegasus-large")
 
-    def get_tokenizer(self, **kwargs) -> PegasusTokenizer:
-        return PegasusTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs) -> PegasusTokenizer:
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return PegasusTokenizer.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         return ("This is a test", "This is a test")
@@ -70,8 +76,8 @@ class PegasusTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         self.assertEqual(self.get_tokenizer().vocab_size, 1_103)
 
     def test_mask_tokens_rust_pegasus(self):
-        rust_tokenizer = self.rust_tokenizer_class.from_pretrained(self.tmpdirname)
-        py_tokenizer = self.tokenizer_class.from_pretrained(self.tmpdirname)
+        rust_tokenizer = self.get_rust_tokenizer(self.tmpdirname)
+        py_tokenizer = self.get_tokenizer(self.tmpdirname)
         raw_input_str = (
             "Let's see which <unk> is the better <unk_token_11> one <mask_1> It seems like this <mask_2> was important"
             " </s> <pad> <pad> <pad>"
@@ -138,26 +144,31 @@ class BigBirdPegasusTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = PegasusTokenizer(SAMPLE_VOCAB, offset=0, mask_token_sent=None, mask_token="[MASK]")
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     @cached_property
     def _large_tokenizer(self):
         return PegasusTokenizer.from_pretrained("google/bigbird-pegasus-large-arxiv")
 
-    def get_tokenizer(self, **kwargs) -> PegasusTokenizer:
-        return PegasusTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs) -> PegasusTokenizer:
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return PegasusTokenizer.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         return ("This is a test", "This is a test")
 
     def test_mask_tokens_rust_pegasus(self):
-        rust_tokenizer = self.rust_tokenizer_class.from_pretrained(self.tmpdirname)
-        py_tokenizer = self.tokenizer_class.from_pretrained(self.tmpdirname)
+        rust_tokenizer = self.get_rust_tokenizer(self.tmpdirname)
+        py_tokenizer = self.get_tokenizer(self.tmpdirname)
         raw_input_str = (
             "Let's see which <unk> is the better <unk_token> one [MASK] It seems like this [MASK] was important </s>"
             " <pad> <pad> <pad>"

tests/models/perceiver/test_tokenization_perceiver.py

@@ -19,12 +19,13 @@ import re
 import shutil
 import tempfile
 import unittest
+from functools import lru_cache
 from typing import Tuple
 
 from transformers import AddedToken, BatchEncoding, PerceiverTokenizer
 from transformers.utils import cached_property, is_tf_available, is_torch_available
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 if is_torch_available():
@@ -40,17 +41,22 @@ class PerceiverTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     tokenizer_class = PerceiverTokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
         tokenizer = PerceiverTokenizer()
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     @cached_property
     def perceiver_tokenizer(self):
         return PerceiverTokenizer.from_pretrained("deepmind/language-perceiver")
 
-    def get_tokenizer(self, **kwargs) -> PerceiverTokenizer:
-        return self.tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs) -> PerceiverTokenizer:
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
     def get_clean_sequence(self, tokenizer, with_prefix_space=False, max_length=20, min_length=5) -> Tuple[str, list]:
         # XXX The default common tokenizer tests assume that every ID is decodable on its own.

tests/models/phobert/test_tokenization_phobert.py

@@ -15,10 +15,11 @@
 
 import os
 import unittest
+from functools import lru_cache
 
 from transformers.models.phobert.tokenization_phobert import VOCAB_FILES_NAMES, PhobertTokenizer
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 class PhobertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
@@ -26,27 +27,32 @@ class PhobertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     tokenizer_class = PhobertTokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # Adapted from Sennrich et al. 2015 and https://github.com/rsennrich/subword-nmt
         vocab = ["T@@", "i", "I", "R@@", "r", "e@@"]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["#version: 0.2", "l à</w>"]
-        self.special_tokens_map = {"unk_token": "<unk>"}
+        cls.special_tokens_map = {"unk_token": "<unk>"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
 
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             for token in vocab_tokens:
                 fp.write(f"{token} {vocab_tokens[token]}\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return PhobertTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return PhobertTokenizer.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "Tôi là VinAI Research"

tests/models/plbart/test_tokenization_plbart.py

@@ -45,12 +45,13 @@ class PLBartTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     rust_tokenizer_class = None
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = PLBartTokenizer(SAMPLE_VOCAB, language_codes="base", keep_accents=True)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def test_full_base_tokenizer(self):
         tokenizer = PLBartTokenizer(SAMPLE_VOCAB, language_codes="base", keep_accents=True)

tests/models/prophetnet/test_tokenization_prophetnet.py

@@ -36,8 +36,9 @@ class ProphetNetTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     tokenizer_class = ProphetNetTokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab_tokens = [
             "[UNK]",
@@ -56,8 +57,8 @@ class ProphetNetTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             "low",
             "lowest",
         ]
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as vocab_writer:
             vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
 
     def get_input_output_texts(self, tokenizer):

tests/models/qwen2/test_tokenization_qwen2.py

@@ -14,15 +14,17 @@
 # limitations under the License.
 
 
+import copy
 import json
 import os
 import unittest
+from functools import lru_cache
 
 from transformers import AddedToken, Qwen2Tokenizer, Qwen2TokenizerFast
 from transformers.models.qwen2.tokenization_qwen2 import VOCAB_FILES_NAMES, bytes_to_unicode
 from transformers.testing_utils import require_tokenizers, slow
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 @require_tokenizers
@@ -36,8 +38,9 @@ class Qwen2TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     from_pretrained_kwargs = None
     test_seq2seq = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # this make sure the vocabuary is complete at the byte level.
         vocab = list(bytes_to_unicode().values())
@@ -81,22 +84,34 @@ class Qwen2TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             "# #",
         ]
 
-        self.special_tokens_map = {"eos_token": "<|endoftext|>"}
+        cls.special_tokens_map = {"eos_token": "<|endoftext|>"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return Qwen2Tokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        _kwargs = copy.deepcopy(cls.special_tokens_map)
+        _kwargs.update(kwargs)
+        kwargs = _kwargs
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return Qwen2Tokenizer.from_pretrained(pretrained_name, **kwargs)
 
-    def get_rust_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return Qwen2TokenizerFast.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs):
+        _kwargs = copy.deepcopy(cls.special_tokens_map)
+        _kwargs.update(kwargs)
+        kwargs = _kwargs
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return Qwen2TokenizerFast.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         # this case should cover

tests/models/reformer/test_tokenization_reformer.py

@@ -34,11 +34,12 @@ class ReformerTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_seq2seq = False
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         tokenizer = ReformerTokenizer(SAMPLE_VOCAB, keep_accents=True)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def test_convert_token_and_id(self):
         """Test ``_convert_token_to_id`` and ``_convert_id_to_token``."""
@@ -84,7 +85,7 @@ class ReformerTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_padding(self, max_length=15):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 # Simple input
                 s = "This is a simple input"

tests/models/rembert/test_tokenization_rembert.py

@@ -39,11 +39,12 @@ class RemBertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_sentencepiece_ignore_case = True
     pre_trained_model_path = "google/rembert"
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         tokenizer = RemBertTokenizer(SAMPLE_VOCAB)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     # Copied from ReformerTokenizationTest.get_input_output_texts
     def get_input_output_texts(self, tokenizer):
@@ -222,7 +223,7 @@ class RemBertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
                 with self.subTest("Hub -> Fast: Test loading a fast tokenizer from the hub)"):
                     if self.rust_tokenizer_class is not None:
-                        tokenizer_fast = self.rust_tokenizer_class.from_pretrained(pretrained_name, eos_token=new_eos)
+                        tokenizer_fast = self.get_rust_tokenizer(pretrained_name, eos_token=new_eos)
                         self.assertEqual(tokenizer_fast._special_tokens_map["eos_token"], new_eos)
                         self.assertIn(new_eos, list(tokenizer_fast.added_tokens_decoder.values()))
                         # We can't test the following because for BC we kept the default rstrip lstrip in slow not fast. Will comment once normalization is alright

tests/models/roberta/test_tokenization_roberta.py

@@ -18,12 +18,13 @@ import itertools
 import json
 import os
 import unittest
+from functools import lru_cache
 
 from transformers import AddedToken, RobertaTokenizer, RobertaTokenizerFast
 from transformers.models.roberta.tokenization_roberta import VOCAB_FILES_NAMES
 from transformers.testing_utils import require_tokenizers, slow
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 @require_tokenizers
@@ -34,8 +35,9 @@ class RobertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     from_pretrained_kwargs = {"cls_token": "<s>"}
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # Adapted from Sennrich et al. 2015 and https://github.com/rsennrich/subword-nmt
         vocab = [
@@ -62,22 +64,30 @@ class RobertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         ]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["#version: 0.2", "\u0120 l", "\u0120l o", "\u0120lo w", "e r", ""]
-        self.special_tokens_map = {"unk_token": "<unk>"}
+        cls.special_tokens_map = {"unk_token": "<unk>"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
-        with open(self.merges_file, "w", encoding="utf-8") as fp:
+        with open(cls.merges_file, "w", encoding="utf-8") as fp:
             fp.write("\n".join(merges))
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return self.tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
-    def get_rust_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return self.rust_tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "lower newer"
@@ -171,8 +181,8 @@ class RobertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_embeded_special_tokens(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 sentence = "A, <mask> AllenNLP sentence."
                 tokens_r = tokenizer_r.encode_plus(sentence, add_special_tokens=True, return_token_type_ids=True)
                 tokens_p = tokenizer_p.encode_plus(sentence, add_special_tokens=True, return_token_type_ids=True)
@@ -202,7 +212,7 @@ class RobertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
     def test_change_add_prefix_space_and_trim_offsets_args(self):
         for trim_offsets, add_prefix_space in itertools.product([True, False], repeat=2):
-            tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+            tokenizer_r = self.get_rust_tokenizer(
                 self.tmpdirname, use_fast=True, add_prefix_space=add_prefix_space, trim_offsets=trim_offsets
             )
 
@@ -222,7 +232,7 @@ class RobertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                 text_of_1_token = "hello"  # `hello` is a token in the vocabulary of `pretrained_name`
                 text = f"{text_of_1_token} {text_of_1_token}"
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, use_fast=True, add_prefix_space=True, trim_offsets=True
                 )
                 encoding = tokenizer_r(text, return_offsets_mapping=True, add_special_tokens=False)
@@ -232,7 +242,7 @@ class RobertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                     (len(text_of_1_token) + 1, len(text_of_1_token) + 1 + len(text_of_1_token)),
                 )
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, use_fast=True, add_prefix_space=False, trim_offsets=True
                 )
                 encoding = tokenizer_r(text, return_offsets_mapping=True, add_special_tokens=False)
@@ -242,7 +252,7 @@ class RobertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                     (len(text_of_1_token) + 1, len(text_of_1_token) + 1 + len(text_of_1_token)),
                 )
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, use_fast=True, add_prefix_space=True, trim_offsets=False
                 )
                 encoding = tokenizer_r(text, return_offsets_mapping=True, add_special_tokens=False)
@@ -252,7 +262,7 @@ class RobertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                     (len(text_of_1_token), len(text_of_1_token) + 1 + len(text_of_1_token)),
                 )
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, use_fast=True, add_prefix_space=False, trim_offsets=False
                 )
                 encoding = tokenizer_r(text, return_offsets_mapping=True, add_special_tokens=False)
@@ -274,7 +284,7 @@ class RobertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                 #     (1 + len(text_of_1_token) + 1, 1 + len(text_of_1_token) + 1 + len(text_of_1_token)),
                 # )
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, use_fast=True, add_prefix_space=False, trim_offsets=True
                 )
                 encoding = tokenizer_r(text, return_offsets_mapping=True, add_special_tokens=False)
@@ -284,7 +294,7 @@ class RobertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                     (1 + len(text_of_1_token) + 1, 1 + len(text_of_1_token) + 1 + len(text_of_1_token)),
                 )
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, use_fast=True, add_prefix_space=True, trim_offsets=False
                 )
                 encoding = tokenizer_r(text, return_offsets_mapping=True, add_special_tokens=False)
@@ -294,7 +304,7 @@ class RobertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                     (1 + len(text_of_1_token), 1 + len(text_of_1_token) + 1 + len(text_of_1_token)),
                 )
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, use_fast=True, add_prefix_space=False, trim_offsets=False
                 )
                 encoding = tokenizer_r(text, return_offsets_mapping=True, add_special_tokens=False)

tests/models/roc_bert/test_tokenization_roc_bert.py

@@ -41,8 +41,9 @@ class BertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     space_between_special_tokens = True
     from_pretrained_filter = filter_non_english
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab_tokens = ["[UNK]", "[CLS]", "[SEP]", "[PAD]", "[MASK]", "你", "好", "是", "谁", "a", "b", "c", "d"]
         word_shape = {}
@@ -50,14 +51,14 @@ class BertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for i, value in enumerate(vocab_tokens):
             word_shape[value] = i
             word_pronunciation[value] = i
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.word_shape_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["word_shape_file"])
-        self.word_pronunciation_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["word_pronunciation_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.word_shape_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["word_shape_file"])
+        cls.word_pronunciation_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["word_pronunciation_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as vocab_writer:
             vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
-        with open(self.word_shape_file, "w", encoding="utf-8") as word_shape_writer:
+        with open(cls.word_shape_file, "w", encoding="utf-8") as word_shape_writer:
             json.dump(word_shape, word_shape_writer, ensure_ascii=False)
-        with open(self.word_pronunciation_file, "w", encoding="utf-8") as word_pronunciation_writer:
+        with open(cls.word_pronunciation_file, "w", encoding="utf-8") as word_pronunciation_writer:
             json.dump(word_pronunciation, word_pronunciation_writer, ensure_ascii=False)
 
     def test_full_tokenizer(self):
@@ -204,7 +205,7 @@ class BertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_offsets_with_special_characters(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 sentence = f"A, naïve {tokenizer_r.mask_token} AllenNLP sentence."
                 tokens = tokenizer_r.encode_plus(
@@ -260,8 +261,8 @@ class BertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 kwargs["tokenize_chinese_chars"] = True
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 ids_without_spe_char_p = tokenizer_p.encode(text_with_chinese_char, add_special_tokens=False)
                 ids_without_spe_char_r = tokenizer_r.encode(text_with_chinese_char, add_special_tokens=False)
@@ -274,8 +275,8 @@ class BertTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                 self.assertListEqual(tokens_without_spe_char_r, list_of_commun_chinese_char)
 
                 kwargs["tokenize_chinese_chars"] = False
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 ids_without_spe_char_r = tokenizer_r.encode(text_with_chinese_char, add_special_tokens=False)
                 ids_without_spe_char_p = tokenizer_p.encode(text_with_chinese_char, add_special_tokens=False)

tests/models/roformer/test_tokenization_roformer.py

@@ -15,11 +15,12 @@
 
 import tempfile
 import unittest
+from functools import lru_cache
 
 from transformers import RoFormerTokenizer, RoFormerTokenizerFast
 from transformers.testing_utils import require_rjieba, require_tokenizers
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 @require_rjieba
@@ -31,14 +32,25 @@ class RoFormerTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     space_between_special_tokens = True
     test_rust_tokenizer = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        tokenizer = cls.tokenizer_class.from_pretrained("junnyu/roformer_chinese_base")
+        tokenizer.save_pretrained(cls.tmpdirname)
 
-    def get_tokenizer(self, **kwargs):
-        return self.tokenizer_class.from_pretrained("junnyu/roformer_chinese_base", **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
-    def get_rust_tokenizer(self, **kwargs):
-        return self.rust_tokenizer_class.from_pretrained("junnyu/roformer_chinese_base", **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs):
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
     def get_chinese_input_output_texts(self):
         input_text = "永和服装饰品有限公司,今天天气非常好"

tests/models/seamless_m4t/test_tokenization_seamless_m4t.py

@@ -59,12 +59,13 @@ class SeamlessM4TTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_sentencepiece = True
     from_pretrained_kwargs = {}
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = SeamlessM4TTokenizer(SAMPLE_VOCAB, keep_accents=True)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def test_full_tokenizer(self):
         tokenizer = SeamlessM4TTokenizer(SAMPLE_VOCAB, keep_accents=True)
@@ -353,7 +354,7 @@ class SeamlessM4TTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 added_tokens = [AddedToken("<special>", lstrip=True)]
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, additional_special_tokens=added_tokens, **kwargs
                 )
                 r_output = tokenizer_r.encode("Hey this is a <special> token")
@@ -363,7 +364,7 @@ class SeamlessM4TTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                 self.assertTrue(special_token_id in r_output)
 
                 if self.test_slow_tokenizer:
-                    tokenizer_cr = self.rust_tokenizer_class.from_pretrained(
+                    tokenizer_cr = self.get_rust_tokenizer(
                         pretrained_name,
                         additional_special_tokens=added_tokens,
                         **kwargs,  # , from_slow=True <- unfortunately too slow to convert

tests/models/siglip/test_tokenization_siglip.py

@@ -17,12 +17,13 @@ import json
 import os
 import tempfile
 import unittest
+from functools import lru_cache
 
 from transformers import SPIECE_UNDERLINE, AddedToken, BatchEncoding, SiglipTokenizer
 from transformers.testing_utils import get_tests_dir, require_sentencepiece, require_tokenizers, slow
 from transformers.utils import cached_property, is_tf_available, is_torch_available
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 SAMPLE_VOCAB = get_tests_dir("fixtures/test_sentencepiece.model")
@@ -44,13 +45,13 @@ class SiglipTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_sentencepiece = True
     test_sentencepiece_ignore_case = True
 
-    # Copied from tests.models.t5.test_tokenization_t5.T5TokenizationTest.setUp with T5->Siglip
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = SiglipTokenizer(SAMPLE_VOCAB)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     # Copied from tests.models.t5.test_tokenization_t5.T5TokenizationTest.test_convert_token_and_id with T5->Siglip
     def test_convert_token_and_id(self):
@@ -135,9 +136,12 @@ class SiglipTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def siglip_tokenizer(self):
         return SiglipTokenizer.from_pretrained("google/siglip-base-patch16-224")
 
-    # Copied from tests.models.t5.test_tokenization_t5.T5TokenizationTest.get_tokenizer with T5->Siglip
-    def get_tokenizer(self, **kwargs) -> SiglipTokenizer:
-        return self.tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs) -> SiglipTokenizer:
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
     # Copied from tests.models.t5.test_tokenization_t5.T5TokenizationTest.test_rust_and_python_full_tokenizers with T5->Siglip
     def test_rust_and_python_full_tokenizers(self):
@@ -227,10 +231,10 @@ class SiglipTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 added_tokens = [f"<extra_id_{i}>" for i in range(100)] + [AddedToken("<special>", lstrip=True)]
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, additional_special_tokens=added_tokens, **kwargs
                 )
-                tokenizer_cr = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_cr = self.get_rust_tokenizer(
                     pretrained_name, additional_special_tokens=added_tokens, **kwargs, from_slow=True
                 )
                 tokenizer_p = self.tokenizer_class.from_pretrained(

tests/models/speech_to_text/test_tokenization_speech_to_text.py

@@ -42,8 +42,9 @@ class SpeechToTextTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = False
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         spm_model = sp.SentencePieceProcessor()
         spm_model.Load(SAMPLE_VOCAB)
@@ -52,13 +53,13 @@ class SpeechToTextTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
         vocab += [spm_model.IdToPiece(id_) for id_ in range(len(spm_model))]
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
 
-        save_dir = Path(self.tmpdirname)
+        save_dir = Path(cls.tmpdirname)
         save_json(vocab_tokens, save_dir / VOCAB_FILES_NAMES["vocab_file"])
         if not (save_dir / VOCAB_FILES_NAMES["spm_file"]).exists():
             copyfile(SAMPLE_VOCAB, save_dir / VOCAB_FILES_NAMES["spm_file"])
 
-        tokenizer = Speech2TextTokenizer.from_pretrained(self.tmpdirname)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer = Speech2TextTokenizer.from_pretrained(cls.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def test_convert_token_and_id(self):
         """Test ``_convert_token_to_id`` and ``_convert_id_to_token``."""

tests/models/speecht5/test_tokenization_speecht5.py

@@ -35,8 +35,9 @@ class SpeechT5TokenizerTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = False
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = SpeechT5Tokenizer(SAMPLE_VOCAB)
@@ -46,7 +47,7 @@ class SpeechT5TokenizerTest(TokenizerTesterMixin, unittest.TestCase):
         tokenizer.add_special_tokens({"mask_token": mask_token})
         tokenizer.add_tokens(["<ctc_blank>"])
 
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "this is a test"

tests/models/splinter/test_tokenization_splinter.py

@@ -13,8 +13,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import unittest
+from functools import lru_cache
 
-from tests.test_tokenization_common import TokenizerTesterMixin
+from tests.test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 from transformers import SplinterTokenizerFast, is_tf_available, is_torch_available
 from transformers.models.splinter import SplinterTokenizer
 from transformers.testing_utils import get_tests_dir, slow
@@ -40,20 +41,29 @@ class SplinterTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     pre_trained_model_path = "tau/splinter-base"
 
     # Copied from transformers.models.siglip.SiglipTokenizationTest.setUp
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
         tokenizer = SplinterTokenizer(SAMPLE_VOCAB)
         tokenizer.vocab["[UNK]"] = len(tokenizer.vocab)
         tokenizer.vocab["[QUESTION]"] = len(tokenizer.vocab)
         tokenizer.vocab["."] = len(tokenizer.vocab)
         tokenizer.add_tokens("this is a test thou shall not determine rigor truly".split())
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
-    def get_tokenizer(self, **kwargs) -> SplinterTokenizer:
-        return self.tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs) -> SplinterTokenizer:
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
-    def get_rust_tokenizer(self, **kwargs) -> SplinterTokenizerFast:
-        return self.rust_tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs) -> SplinterTokenizerFast:
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
     # Copied from transformers.models.siglip.SiglipTokenizationTest.test_get_vocab
     def test_get_vocab(self):

tests/models/squeezebert/test_tokenization_squeezebert.py

@@ -13,22 +13,31 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from functools import lru_cache
 
 from transformers import SqueezeBertTokenizer, SqueezeBertTokenizerFast
 from transformers.testing_utils import require_tokenizers, slow
 
-from ..bert.test_tokenization_bert import BertTokenizationTest
+from ...test_tokenization_common import use_cache_if_possible
+
+# Avoid import `BertTokenizationTest` directly as it will run as `test_tokenization_squeezebert.py::BertTokenizationTest`
+# together with `test_tokenization_bert.py::BertTokenizationTest`.
+from ..bert import test_tokenization_bert
 
 
 @require_tokenizers
-class SqueezeBertTokenizationTest(BertTokenizationTest):
+class SqueezeBertTokenizationTest(test_tokenization_bert.BertTokenizationTest):
     tokenizer_class = SqueezeBertTokenizer
     rust_tokenizer_class = SqueezeBertTokenizerFast
     test_rust_tokenizer = True
     from_pretrained_id = "squeezebert/squeezebert-uncased"
 
-    def get_rust_tokenizer(self, **kwargs):
-        return SqueezeBertTokenizerFast.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs):
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return SqueezeBertTokenizerFast.from_pretrained(pretrained_name, **kwargs)
 
     @slow
     def test_sequence_builders(self):

tests/models/t5/test_tokenization_t5.py

@@ -17,12 +17,13 @@ import os
 import re
 import tempfile
 import unittest
+from functools import lru_cache
 
 from transformers import SPIECE_UNDERLINE, AddedToken, BatchEncoding, T5Tokenizer, T5TokenizerFast
 from transformers.testing_utils import get_tests_dir, require_sentencepiece, require_seqio, require_tokenizers, slow
 from transformers.utils import cached_property, is_tf_available, is_torch_available
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 SAMPLE_VOCAB = get_tests_dir("fixtures/test_sentencepiece.model")
@@ -44,12 +45,13 @@ class T5TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = T5Tokenizer(SAMPLE_VOCAB)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def test_convert_token_and_id(self):
         """Test ``_convert_token_to_id`` and ``_convert_id_to_token``."""
@@ -145,11 +147,19 @@ class T5TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def t5_base_tokenizer_fast(self):
         return T5TokenizerFast.from_pretrained("google-t5/t5-base")
 
-    def get_tokenizer(self, **kwargs) -> T5Tokenizer:
-        return self.tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs) -> T5Tokenizer:
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
-    def get_rust_tokenizer(self, **kwargs) -> T5TokenizerFast:
-        return self.rust_tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs) -> T5TokenizerFast:
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
     def test_rust_and_python_full_tokenizers(self):
         if not self.test_rust_tokenizer:
@@ -275,10 +285,10 @@ class T5TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 added_tokens = [f"<extra_id_{i}>" for i in range(100)] + [AddedToken("<special>", lstrip=True)]
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, additional_special_tokens=added_tokens, **kwargs
                 )
-                tokenizer_cr = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_cr = self.get_rust_tokenizer(
                     pretrained_name, additional_special_tokens=added_tokens, **kwargs, from_slow=True
                 )
                 tokenizer_p = self.tokenizer_class.from_pretrained(
@@ -460,10 +470,8 @@ class T5TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         EXPECTED_WITH_SPACE = [9459, 149, 33, 25, 692, 1]
         EXPECTED_WO_SPACE = [3845, 63, 149, 33, 25, 692, 1]
 
-        slow_ = self.tokenizer_class.from_pretrained(pretrained_name, add_prefix_space=False, legacy=False)
-        fast_ = self.rust_tokenizer_class.from_pretrained(
-            pretrained_name, add_prefix_space=False, legacy=False, from_slow=True
-        )
+        slow_ = self.get_tokenizer(pretrained_name, add_prefix_space=False, legacy=False)
+        fast_ = self.get_rust_tokenizer(pretrained_name, add_prefix_space=False, legacy=False, from_slow=True)
         self.assertEqual(slow_.encode(inputs), EXPECTED_WO_SPACE)
         self.assertEqual(slow_.encode(inputs), fast_.encode(inputs))
         self.assertEqual(slow_.tokenize(inputs), ["He", "y", "▁how", "▁are", "▁you", "▁doing"])
@@ -473,8 +481,8 @@ class T5TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             fast_.decode(EXPECTED_WO_SPACE, skip_special_tokens=True),
         )
 
-        slow_ = self.tokenizer_class.from_pretrained(pretrained_name, add_prefix_space=True, legacy=False)
-        fast_ = self.rust_tokenizer_class.from_pretrained(pretrained_name, add_prefix_space=True, legacy=False)
+        slow_ = self.get_tokenizer(pretrained_name, add_prefix_space=True, legacy=False)
+        fast_ = self.get_rust_tokenizer(pretrained_name, add_prefix_space=True, legacy=False)
         self.assertEqual(slow_.encode(inputs), EXPECTED_WITH_SPACE)
         self.assertEqual(slow_.encode(inputs), fast_.encode(inputs))
         self.assertEqual(slow_.tokenize(inputs), ["▁Hey", "▁how", "▁are", "▁you", "▁doing"])

tests/models/tapas/test_tokenization_tapas.py

@@ -112,8 +112,9 @@ class TapasTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
         return output_txt, output_ids
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab_tokens = [
             "[UNK]",
@@ -132,8 +133,8 @@ class TapasTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             "low",
             "lowest",
         ]
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as vocab_writer:
             vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
 
     def get_input_output_texts(self, tokenizer):
@@ -352,7 +353,7 @@ class TapasTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_offsets_with_special_characters(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 sentence = f"A, naïve {tokenizer_r.mask_token} AllenNLP sentence."
                 tokens = tokenizer_r.encode_plus(

tests/models/udop/test_tokenization_udop.py

@@ -93,12 +93,13 @@ class UdopTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
         return questions, words, boxes
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = UdopTokenizer(SAMPLE_VOCAB, keep_accents=True)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def get_input_output_texts(self, tokenizer):
         input_text = "UNwant\u00e9d,running"
@@ -456,8 +457,8 @@ class UdopTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_padding(self, max_length=50):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 self.assertEqual(tokenizer_p.pad_token_id, tokenizer_r.pad_token_id)
                 pad_token_id = tokenizer_p.pad_token_id
@@ -922,8 +923,8 @@ class UdopTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 # Input tokens id
                 words, boxes = self.get_words_and_boxes()
@@ -1109,7 +1110,7 @@ class UdopTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_offsets_mapping(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 text = ["a", "wonderful", "test"]
                 boxes = [[1, 8, 12, 20] for _ in range(len(text))]
@@ -1239,8 +1240,8 @@ class UdopTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 words, boxes = self.get_words_and_boxes()
 
@@ -1293,8 +1294,8 @@ class UdopTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 words, boxes = self.get_words_and_boxes()
                 tokens_r = tokenizer_r.encode_plus_boxes(
                     words,
@@ -1320,7 +1321,7 @@ class UdopTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     def test_compare_add_special_tokens(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 simple_num_special_tokens_to_add = tokenizer_r.num_special_tokens_to_add(pair=False)
 
@@ -1402,7 +1403,7 @@ class UdopTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 added_tokens = [AddedToken("<special>", lstrip=True)]
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, additional_special_tokens=added_tokens, **kwargs
                 )
                 words = "Hey this is a <special> token".split()
@@ -1416,7 +1417,7 @@ class UdopTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
                 self.assertTrue(special_token_id in r_output)
 
                 if self.test_slow_tokenizer:
-                    tokenizer_cr = self.rust_tokenizer_class.from_pretrained(
+                    tokenizer_cr = self.get_rust_tokenizer(
                         pretrained_name, additional_special_tokens=added_tokens, **kwargs, from_slow=True
                     )
                     tokenizer_p = self.tokenizer_class.from_pretrained(
@@ -1591,8 +1592,8 @@ class UdopTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 self.assertEqual(tokenizer_p.pad_token_id, tokenizer_r.pad_token_id)
                 pad_token_id = tokenizer_p.pad_token_id
 

tests/models/vits/test_tokenization_vits.py

@@ -19,12 +19,13 @@ import os
 import shutil
 import tempfile
 import unittest
+from functools import lru_cache
 
 from transformers import VitsTokenizer
 from transformers.models.vits.tokenization_vits import VOCAB_FILES_NAMES
 from transformers.testing_utils import slow
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 class VitsTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
@@ -32,8 +33,9 @@ class VitsTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
     tokenizer_class = VitsTokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab = (
             "k ' z y u d h e s w – 3 c p - 1 j m i X f l o 0 b r a 4 2 n _ x v t q 5 6 g ț ţ < > | <pad> <unk>".split(
@@ -44,18 +46,22 @@ class VitsTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
         vocab_tokens[" "] = vocab_tokens["X"]
         del vocab_tokens["X"]
 
-        self.special_tokens_map = {"pad_token": "<pad>", "unk_token": "<unk>"}
+        cls.special_tokens_map = {"pad_token": "<pad>", "unk_token": "<unk>"}
 
-        self.tmpdirname = tempfile.mkdtemp()
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.tmpdirname = tempfile.mkdtemp()
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
         kwargs["phonemize"] = False
         kwargs["normalize"] = False
-        return VitsTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return VitsTokenizer.from_pretrained(pretrained_name, **kwargs)
 
     def get_clean_sequence(self, tokenizer, with_prefix_space=False, max_length=20, min_length=5):
         txt = "beyonce lives in los angeles"

tests/models/wav2vec2/test_tokenization_wav2vec2.py

@@ -21,6 +21,7 @@ import random
 import shutil
 import tempfile
 import unittest
+from functools import lru_cache
 
 import numpy as np
 
@@ -33,7 +34,7 @@ from transformers import (
 from transformers.models.wav2vec2.tokenization_wav2vec2 import VOCAB_FILES_NAMES, Wav2Vec2CTCTokenizerOutput
 from transformers.testing_utils import require_torch, slow
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 global_rng = random.Random()
@@ -57,22 +58,27 @@ def floats_list(shape, scale=1.0, rng=None, name=None):
 class Wav2Vec2TokenizerTest(unittest.TestCase):
     tokenizer_class = Wav2Vec2Tokenizer
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab = "<pad> <s> </s> <unk> | E T A O N I H S R D L U M W C F G Y P B V K ' X J Q Z".split(" ")
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
 
-        self.special_tokens_map = {"pad_token": "<pad>", "unk_token": "<unk>", "bos_token": "<s>", "eos_token": "</s>"}
+        cls.special_tokens_map = {"pad_token": "<pad>", "unk_token": "<unk>", "bos_token": "<s>", "eos_token": "</s>"}
 
-        self.tmpdirname = tempfile.mkdtemp()
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.tmpdirname = tempfile.mkdtemp()
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return Wav2Vec2Tokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return Wav2Vec2Tokenizer.from_pretrained(pretrained_name, **kwargs)
 
     def test_tokenizer_decode(self):
         # TODO(PVP) - change to facebook
@@ -237,7 +243,7 @@ class Wav2Vec2TokenizerTest(unittest.TestCase):
 
     def test_save_pretrained(self):
         pretrained_name = list(self.tokenizer_class.pretrained_vocab_files_map["vocab_file"].keys())[0]
-        tokenizer = self.tokenizer_class.from_pretrained(pretrained_name)
+        tokenizer = self.get_tokenizer(pretrained_name)
         tmpdirname2 = tempfile.mkdtemp()
 
         tokenizer_files = tokenizer.save_pretrained(tmpdirname2)
@@ -373,22 +379,27 @@ class Wav2Vec2CTCTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
     tokenizer_class = Wav2Vec2CTCTokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab = "<pad> <s> </s> <unk> | E T A O N I H S R D L U M W C F G Y P B V K ' X J Q Z".split(" ")
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
 
-        self.special_tokens_map = {"pad_token": "<pad>", "unk_token": "<unk>", "bos_token": "<s>", "eos_token": "</s>"}
+        cls.special_tokens_map = {"pad_token": "<pad>", "unk_token": "<unk>", "bos_token": "<s>", "eos_token": "</s>"}
 
-        self.tmpdirname = tempfile.mkdtemp()
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.tmpdirname = tempfile.mkdtemp()
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return Wav2Vec2CTCTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return Wav2Vec2CTCTokenizer.from_pretrained(pretrained_name, **kwargs)
 
     def test_tokenizer_add_token_chars(self):
         tokenizer = self.tokenizer_class.from_pretrained("facebook/wav2vec2-base-960h")

tests/models/wav2vec2_phoneme/test_tokenization_wav2vec2_phoneme.py

@@ -17,6 +17,7 @@
 import json
 import os
 import unittest
+from functools import lru_cache
 from typing import Tuple
 
 from transformers import Wav2Vec2PhonemeCTCTokenizer
@@ -24,7 +25,7 @@ from transformers.models.wav2vec2.tokenization_wav2vec2 import VOCAB_FILES_NAMES
 from transformers.models.wav2vec2_phoneme.tokenization_wav2vec2_phoneme import Wav2Vec2PhonemeCTCTokenizerOutput
 from transformers.testing_utils import require_phonemizer
 
-from ...test_tokenization_common import TokenizerTesterMixin
+from ...test_tokenization_common import TokenizerTesterMixin, use_cache_if_possible
 
 
 @require_phonemizer
@@ -33,8 +34,9 @@ class Wav2Vec2PhonemeCTCTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
     tokenizer_class = Wav2Vec2PhonemeCTCTokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         vocab = (
             "<s> <pad> </s> <unk> n s t ə l a i k d m ɛ ɾ e ɪ p o ɐ z ð f j v b ɹ ʁ ʊ iː r w ʌ u ɡ æ aɪ ʃ h ɔ ɑː "
@@ -53,10 +55,10 @@ class Wav2Vec2PhonemeCTCTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
         ).split(" ")
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
 
-        self.special_tokens_map = {"pad_token": "<pad>", "unk_token": "<unk>", "bos_token": "<s>", "eos_token": "</s>"}
+        cls.special_tokens_map = {"pad_token": "<pad>", "unk_token": "<unk>", "bos_token": "<s>", "eos_token": "</s>"}
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        with open(self.vocab_file, "w", encoding="utf-8") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        with open(cls.vocab_file, "w", encoding="utf-8") as fp:
             fp.write(json.dumps(vocab_tokens) + "\n")
 
     # overwrite since phonemes require specific creation
@@ -84,9 +86,13 @@ class Wav2Vec2PhonemeCTCTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
         output_ids = tokenizer.encode(output_txt, add_special_tokens=False)
         return output_txt, output_ids
 
-    def get_tokenizer(self, **kwargs):
-        kwargs.update(self.special_tokens_map)
-        return Wav2Vec2PhonemeCTCTokenizer.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs):
+        kwargs.update(cls.special_tokens_map)
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return Wav2Vec2PhonemeCTCTokenizer.from_pretrained(pretrained_name, **kwargs)
 
     def test_tokenizer_add_new_tokens(self):
         tokenizer = self.tokenizer_class.from_pretrained("facebook/wav2vec2-lv-60-espeak-cv-ft")

tests/models/whisper/test_tokenization_whisper.py

@@ -40,12 +40,13 @@ class WhisperTokenizerTest(TokenizerTesterMixin, unittest.TestCase):
     test_sentencepiece = False
     test_seq2seq = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
         tokenizer = WhisperTokenizer.from_pretrained("openai/whisper-tiny")
         tokenizer.pad_token_id = 50256
         tokenizer.pad_token = "<|endoftext|>"
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def test_convert_token_and_id(self):
         """Test ``_convert_token_to_id`` and ``_convert_id_to_token``."""

tests/models/xglm/test_tokenization_xglm.py

@@ -37,12 +37,13 @@ class XGLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = XGLMTokenizer(SAMPLE_VOCAB, keep_accents=True)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def test_convert_token_and_id(self):
         """Test ``_convert_token_to_id`` and ``_convert_id_to_token``."""

tests/models/xlm/test_tokenization_xlm.py

@@ -29,8 +29,9 @@ class XLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     tokenizer_class = XLMTokenizer
     test_rust_tokenizer = False
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # Adapted from Sennrich et al. 2015 and https://github.com/rsennrich/subword-nmt
         vocab = [
@@ -59,11 +60,11 @@ class XLMTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         vocab_tokens = dict(zip(vocab, range(len(vocab))))
         merges = ["l o 123", "lo w 1456", "e r</w> 1789", ""]
 
-        self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
-        self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
-        with open(self.vocab_file, "w") as fp:
+        cls.vocab_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
+        cls.merges_file = os.path.join(cls.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
+        with open(cls.vocab_file, "w") as fp:
             fp.write(json.dumps(vocab_tokens))
-        with open(self.merges_file, "w") as fp:
+        with open(cls.merges_file, "w") as fp:
             fp.write("\n".join(merges))
 
     def get_input_output_texts(self, tokenizer):

tests/models/xlm_roberta/test_tokenization_xlm_roberta.py

@@ -37,12 +37,13 @@ class XLMRobertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = XLMRobertaTokenizer(SAMPLE_VOCAB, keep_accents=True)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def test_convert_token_and_id(self):
         """Test ``_convert_token_to_id`` and ``_convert_id_to_token``."""
@@ -148,8 +149,8 @@ class XLMRobertaTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
         self.tokenizers_list[0] = (self.rust_tokenizer_class, "hf-internal-testing/tiny-xlm-roberta", {})
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 tmpdirname2 = tempfile.mkdtemp()
 

tests/models/xlnet/test_tokenization_xlnet.py

@@ -33,12 +33,13 @@ class XLNetTokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     test_sentencepiece = True
 
-    def setUp(self):
-        super().setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
         # We have a SentencePiece fixture for testing
         tokenizer = XLNetTokenizer(SAMPLE_VOCAB, keep_accents=True)
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     def test_convert_token_and_id(self):
         """Test ``_convert_token_to_id`` and ``_convert_id_to_token``."""

tests/test_tokenization_common.py

@@ -13,6 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import copy
+import functools
 import inspect
 import itertools
 import json
@@ -24,6 +26,7 @@ import tempfile
 import traceback
 import unittest
 from collections import OrderedDict
+from functools import lru_cache
 from itertools import takewhile
 from pathlib import Path
 from typing import TYPE_CHECKING, Any, Dict, List, Tuple, Union
@@ -69,6 +72,38 @@ if TYPE_CHECKING:
     from transformers import PretrainedConfig, PreTrainedModel, TFPreTrainedModel
 
 
+def use_cache_if_possible(func):
+    @functools.wraps(func)
+    def wrapper(*args, **kwargs):
+        use_cache = kwargs.pop("use_cache", True)
+
+        underline_func = func
+        if "functools" in str(func):
+            underline_func = func.__wrapped__
+
+        if not use_cache:
+            return underline_func(*args, **kwargs)
+        if any(not arg.__hash__ for arg in args):
+            return underline_func(*args, **kwargs)
+        elif any(not kwarg.__hash__ for kwarg in kwargs.values()):
+            return underline_func(*args, **kwargs)
+
+        cached = func(*args, **kwargs)
+        copied = copy.deepcopy(cached)
+
+        if hasattr(copied, "_tokenizer") and "tests.models.clip.test_tokenization_clip.CLIPTokenizationTest" in str(
+            args[0]
+        ):
+            copied._tokenizer = cached._tokenizer
+
+        if hasattr(copied, "sp_model"):
+            copied.sp_model = cached.sp_model
+
+        return copied
+
+    return wrapper
+
+
 logger = logging.get_logger(__name__)
 
 NON_ENGLISH_TAGS = ["chinese", "dutch", "french", "finnish", "german", "multilingual"]
@@ -198,32 +233,34 @@ class TokenizerTesterMixin:
     # test_sentencepiece must also be set to True
     test_sentencepiece_ignore_case = False
 
-    def setUp(self) -> None:
+    @classmethod
+    def setUpClass(cls) -> None:
         # Tokenizer.filter makes it possible to filter which Tokenizer to case based on all the
         # information available in Tokenizer (name, rust class, python class, vocab key name)
-        self.from_pretrained_id = (
-            [self.from_pretrained_id] if isinstance(self.from_pretrained_id, str) else self.from_pretrained_id
+        cls.from_pretrained_id = (
+            [cls.from_pretrained_id] if isinstance(cls.from_pretrained_id, str) else cls.from_pretrained_id
         )
 
-        self.tokenizers_list = []
-        if self.test_rust_tokenizer:
-            self.tokenizers_list = [
+        cls.tokenizers_list = []
+        if cls.test_rust_tokenizer:
+            cls.tokenizers_list = [
                 (
-                    self.rust_tokenizer_class,
+                    cls.rust_tokenizer_class,
                     pretrained_id,
-                    self.from_pretrained_kwargs if self.from_pretrained_kwargs is not None else {},
+                    cls.from_pretrained_kwargs if cls.from_pretrained_kwargs is not None else {},
                 )
-                for pretrained_id in self.from_pretrained_id
+                for pretrained_id in cls.from_pretrained_id
             ]
         else:
-            self.tokenizers_list = []
+            cls.tokenizers_list = []
         with open(f"{get_tests_dir()}/fixtures/sample_text.txt", encoding="utf-8") as f_data:
-            self._data = f_data.read().replace("\n\n", "\n").strip()
+            cls._data = f_data.read().replace("\n\n", "\n").strip()
 
-        self.tmpdirname = tempfile.mkdtemp()
+        cls.tmpdirname = tempfile.mkdtemp()
 
-    def tearDown(self):
-        shutil.rmtree(self.tmpdirname)
+    @classmethod
+    def tearDownClass(cls):
+        shutil.rmtree(cls.tmpdirname)
 
     def get_input_output_texts(self, tokenizer):
         input_txt = self.get_clean_sequence(tokenizer)[0]
@@ -267,11 +304,19 @@ class TokenizerTesterMixin:
         else:
             raise ValueError("This tokenizer class has no tokenizer to be tested.")
 
-    def get_tokenizer(self, **kwargs) -> PreTrainedTokenizer:
-        return self.tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_tokenizer(cls, pretrained_name=None, **kwargs) -> PreTrainedTokenizer:
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
-    def get_rust_tokenizer(self, **kwargs) -> PreTrainedTokenizerFast:
-        return self.rust_tokenizer_class.from_pretrained(self.tmpdirname, **kwargs)
+    @classmethod
+    @use_cache_if_possible
+    @lru_cache(maxsize=64)
+    def get_rust_tokenizer(cls, pretrained_name=None, **kwargs) -> PreTrainedTokenizerFast:
+        pretrained_name = pretrained_name or cls.tmpdirname
+        return cls.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
 
     def tokenizer_integration_test_util(
         self,
@@ -1263,7 +1308,7 @@ class TokenizerTesterMixin:
                 if not self.test_rust_tokenizer:
                     self.skipTest(reason="No fast tokenizer defined")
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name)
                 self._check_no_pad_token_padding(tokenizer_r, conversations)
 
                 tokenizer_r.padding_side = "right"
@@ -1446,7 +1491,7 @@ class TokenizerTesterMixin:
                 if not self.test_rust_tokenizer:
                     self.skipTest(reason="No fast tokenizer defined")
 
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name)
 
                 # Find where to truncate, as the amount of tokens is different for different tokenizers and I want the
                 # truncation to happen in the middle of the assistant content.
@@ -2050,11 +2095,9 @@ class TokenizerTesterMixin:
         if self.rust_tokenizer_class is not None:
             pretrained_name = self.from_pretrained_id
 
-            slow_tokenizer = self.tokenizer_class.from_pretrained(pretrained_name, legacy=False)
+            slow_tokenizer = self.get_tokenizer(pretrained_name, legacy=False)
             with self.subTest(f"{pretrained_name}"):
-                rust_tokenizer = self.rust_tokenizer_class.from_pretrained(
-                    pretrained_name, from_slow=True, legacy=False
-                )
+                rust_tokenizer = self.get_rust_tokenizer(pretrained_name, from_slow=True, legacy=False)
                 input_full_vocab_ids = list(
                     range(len(slow_tokenizer))
                 )  # TODO let's maybe shuffle this! And run it 4 times. This way we cover more cmbinations
@@ -2200,14 +2243,10 @@ class TokenizerTesterMixin:
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 if self.test_rust_tokenizer:
-                    tokenizer_r = self.rust_tokenizer_class.from_pretrained(
-                        pretrained_name, padding_side="left", **kwargs
-                    )
+                    tokenizer_r = self.get_rust_tokenizer(pretrained_name, padding_side="left", **kwargs)
                     self.assertEqual(tokenizer_r.padding_side, "left")
 
-                    tokenizer_r = self.rust_tokenizer_class.from_pretrained(
-                        pretrained_name, padding_side="right", **kwargs
-                    )
+                    tokenizer_r = self.get_rust_tokenizer(pretrained_name, padding_side="right", **kwargs)
                     self.assertEqual(tokenizer_r.padding_side, "right")
 
                     self.assertRaises(
@@ -2219,10 +2258,10 @@ class TokenizerTesterMixin:
                     )
 
                 if self.test_slow_tokenizer:
-                    tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, padding_side="left", **kwargs)
+                    tokenizer_p = self.get_tokenizer(pretrained_name, padding_side="left", **kwargs)
                     self.assertEqual(tokenizer_p.padding_side, "left")
 
-                    tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, padding_side="right", **kwargs)
+                    tokenizer_p = self.get_tokenizer(pretrained_name, padding_side="right", **kwargs)
                     self.assertEqual(tokenizer_p.padding_side, "right")
 
                     self.assertRaises(
@@ -2237,14 +2276,10 @@ class TokenizerTesterMixin:
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 if self.test_rust_tokenizer:
-                    tokenizer_r = self.rust_tokenizer_class.from_pretrained(
-                        pretrained_name, truncation_side="left", **kwargs
-                    )
+                    tokenizer_r = self.get_rust_tokenizer(pretrained_name, truncation_side="left", **kwargs)
                     self.assertEqual(tokenizer_r.truncation_side, "left")
 
-                    tokenizer_r = self.rust_tokenizer_class.from_pretrained(
-                        pretrained_name, truncation_side="right", **kwargs
-                    )
+                    tokenizer_r = self.get_rust_tokenizer(pretrained_name, truncation_side="right", **kwargs)
                     self.assertEqual(tokenizer_r.truncation_side, "right")
 
                     self.assertRaises(
@@ -2256,14 +2291,10 @@ class TokenizerTesterMixin:
                     )
 
                 if self.test_slow_tokenizer:
-                    tokenizer_p = self.tokenizer_class.from_pretrained(
-                        pretrained_name, truncation_side="left", **kwargs
-                    )
+                    tokenizer_p = self.get_tokenizer(pretrained_name, truncation_side="left", **kwargs)
                     self.assertEqual(tokenizer_p.truncation_side, "left")
 
-                    tokenizer_p = self.tokenizer_class.from_pretrained(
-                        pretrained_name, truncation_side="right", **kwargs
-                    )
+                    tokenizer_p = self.get_tokenizer(pretrained_name, truncation_side="right", **kwargs)
                     self.assertEqual(tokenizer_p.truncation_side, "right")
 
                     self.assertRaises(
@@ -3194,18 +3225,18 @@ class TokenizerTesterMixin:
     def test_is_fast(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
                 # Check is_fast is set correctly
                 self.assertTrue(tokenizer_r.is_fast)
 
                 if self.test_slow_tokenizer:
-                    tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                    tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                     self.assertFalse(tokenizer_p.is_fast)
 
     def test_fast_only_inputs(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 # Ensure None raise an error
                 self.assertRaises(TypeError, tokenizer_r.tokenize, None)
@@ -3216,7 +3247,7 @@ class TokenizerTesterMixin:
     def test_alignement_methods(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 words = ["Wonderful", "no", "inspiration", "example", "with", "subtoken"]
                 text = " ".join(words)
@@ -3446,8 +3477,8 @@ class TokenizerTesterMixin:
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 # Ensure basic input match
                 input_p = tokenizer_p.encode_plus(self._data)
@@ -3487,8 +3518,8 @@ class TokenizerTesterMixin:
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 # Check we have the same number of added_tokens for both pair and non-pair inputs.
                 self.assertEqual(
@@ -3505,8 +3536,8 @@ class TokenizerTesterMixin:
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 # Check we have the correct max_length for both pair and non-pair inputs.
                 self.assertEqual(tokenizer_r.max_len_single_sentence, tokenizer_p.max_len_single_sentence)
@@ -3520,8 +3551,8 @@ class TokenizerTesterMixin:
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 # sometimes the tokenizer saved online is not the same
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 # Assert the set of special tokens match.
                 self.assertSequenceEqual(
@@ -3532,7 +3563,7 @@ class TokenizerTesterMixin:
     def test_add_tokens(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 vocab_size = len(tokenizer_r)
                 self.assertEqual(tokenizer_r.add_tokens(""), 0)
@@ -3558,7 +3589,7 @@ class TokenizerTesterMixin:
     def test_offsets_mapping(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 text = "Wonderful no inspiration example with subtoken"
                 pair = "Along with an awesome pair"
@@ -3601,7 +3632,7 @@ class TokenizerTesterMixin:
         This needs to be padded so that it can represented as a tensor
         """
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
-            tokenizer = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+            tokenizer = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name}, {tokenizer.__class__.__name__})"):
                 if is_torch_available():
@@ -3663,8 +3694,8 @@ class TokenizerTesterMixin:
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 if hasattr(tokenizer_p, "add_prefix_space") and not tokenizer_p.add_prefix_space:
                     continue  # Too hard to test for now
@@ -3745,8 +3776,8 @@ class TokenizerTesterMixin:
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 input_simple = [1, 2, 3]
                 input_pair = [1, 2, 3]
 
@@ -3767,8 +3798,8 @@ class TokenizerTesterMixin:
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 # # Input string
                 # input_simple = tokenizer_p.tokenize("This is a sample input", add_special_tokens=False)
                 # input_pair = tokenizer_p.tokenize("This is a sample pair", add_special_tokens=False)
@@ -3812,8 +3843,8 @@ class TokenizerTesterMixin:
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 self.assertEqual(tokenizer_p.pad_token_id, tokenizer_r.pad_token_id)
                 pad_token_id = tokenizer_p.pad_token_id
@@ -4038,8 +4069,8 @@ class TokenizerTesterMixin:
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 self.assertEqual(tokenizer_p.pad_token_id, tokenizer_r.pad_token_id)
                 pad_token_id = tokenizer_p.pad_token_id
 
@@ -4076,8 +4107,8 @@ class TokenizerTesterMixin:
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
 
                 tmpdirname2 = tempfile.mkdtemp()
 
@@ -4151,8 +4182,8 @@ class TokenizerTesterMixin:
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
                 sentence = "A, <mask> AllenNLP sentence."
                 tokens_r = tokenizer_r.encode_plus(
                     sentence,
@@ -4176,7 +4207,7 @@ class TokenizerTesterMixin:
     def test_compare_add_special_tokens(self):
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
 
                 simple_num_special_tokens_to_add = tokenizer_r.num_special_tokens_to_add(pair=False)
                 # pair_num_special_tokens_to_add = tokenizer_r.num_special_tokens_to_add(pair=True)
@@ -4219,8 +4250,8 @@ class TokenizerTesterMixin:
 
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs)
-                tokenizer_p = self.tokenizer_class.from_pretrained(pretrained_name, **kwargs)
+                tokenizer_r = self.get_rust_tokenizer(pretrained_name, **kwargs)
+                tokenizer_p = self.get_tokenizer(pretrained_name, **kwargs)
                 string_sequence = "Asserting that both tokenizers are equal"
                 python_output = tokenizer_p.prepare_for_model(
                     tokenizer_p.encode(string_sequence, add_special_tokens=False)
@@ -4235,7 +4266,7 @@ class TokenizerTesterMixin:
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 added_tokens = [AddedToken("<special>", lstrip=True)]
-                tokenizer_r = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_r = self.get_rust_tokenizer(
                     pretrained_name, additional_special_tokens=added_tokens, **kwargs
                 )
                 r_output = tokenizer_r.encode("Hey this is a <special> token")
@@ -4246,12 +4277,10 @@ class TokenizerTesterMixin:
 
                 if self.test_slow_tokenizer:
                     # in rust fast, you lose the information of the AddedToken when initializing with `additional_special_tokens`
-                    tokenizer_cr = self.rust_tokenizer_class.from_pretrained(
+                    tokenizer_cr = self.get_rust_tokenizer(
                         pretrained_name, additional_special_tokens=added_tokens, **kwargs, from_slow=True
                     )
-                    tokenizer_p = self.tokenizer_class.from_pretrained(
-                        pretrained_name, additional_special_tokens=added_tokens, **kwargs
-                    )
+                    tokenizer_p = self.get_tokenizer(pretrained_name, additional_special_tokens=added_tokens, **kwargs)
 
                     p_output = tokenizer_p.encode("Hey this is a <special> token")
 
@@ -4498,7 +4527,7 @@ class TokenizerTesterMixin:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 with tempfile.TemporaryDirectory() as tmp_dir:
                     # Save the fast tokenizer files in a temporary directory
-                    tokenizer_old = self.rust_tokenizer_class.from_pretrained(pretrained_name, **kwargs, use_fast=True)
+                    tokenizer_old = self.get_rust_tokenizer(pretrained_name, **kwargs, use_fast=True)
                     tokenizer_old.save_pretrained(tmp_dir, legacy_format=False)  # save only fast version
 
                     # Initialize toy model for the trainer
@@ -4532,13 +4561,11 @@ class TokenizerTesterMixin:
                 with tempfile.TemporaryDirectory() as tmp_dir_1:
                     # Here we check that even if we have initialized a fast tokenizer with a tokenizer_file we can
                     # still save only the slow version and use these saved files to rebuild a tokenizer
-                    tokenizer_fast_old_1 = self.rust_tokenizer_class.from_pretrained(
-                        pretrained_name, **kwargs, use_fast=True
-                    )
+                    tokenizer_fast_old_1 = self.get_rust_tokenizer(pretrained_name, **kwargs, use_fast=True)
                     tokenizer_file = os.path.join(tmp_dir_1, "tokenizer.json")
                     tokenizer_fast_old_1.backend_tokenizer.save(tokenizer_file)
 
-                    tokenizer_fast_old_2 = self.rust_tokenizer_class.from_pretrained(
+                    tokenizer_fast_old_2 = self.get_rust_tokenizer(
                         pretrained_name, **kwargs, use_fast=True, tokenizer_file=tokenizer_file
                     )
 
@@ -4560,10 +4587,10 @@ class TokenizerTesterMixin:
             special_token = "<my_new_token>"
             special_sentence = f"Hey this is a {special_token} token"
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
-                tokenizer_rust = self.rust_tokenizer_class.from_pretrained(
+                tokenizer_rust = self.get_rust_tokenizer(
                     pretrained_name, additional_special_tokens=[special_token], split_special_tokens=True, **kwargs
                 )
-                tokenizer_py = self.tokenizer_class.from_pretrained(
+                tokenizer_py = self.get_tokenizer(
                     pretrained_name, additional_special_tokens=[special_token], split_special_tokens=True, **kwargs
                 )
 
@@ -4622,7 +4649,7 @@ class TokenizerTesterMixin:
         for tokenizer, pretrained_name, kwargs in self.tokenizers_list:
             with self.subTest(f"{tokenizer.__class__.__name__} ({pretrained_name})"):
                 # Load a slow tokenizer from the hub, init with the new token for fast to also include it
-                tokenizer = self.tokenizer_class.from_pretrained(pretrained_name, eos_token=new_eos)
+                tokenizer = self.get_tokenizer(pretrained_name, eos_token=new_eos)
                 EXPECTED_ADDED_TOKENS_DECODER = tokenizer.added_tokens_decoder
                 with self.subTest("Hub -> Slow: Test loading a slow tokenizer from the hub)"):
                     self.assertEqual(tokenizer._special_tokens_map["eos_token"], new_eos)
@@ -4662,7 +4689,7 @@ class TokenizerTesterMixin:
 
                 with self.subTest("Hub -> Fast: Test loading a fast tokenizer from the hub)"):
                     if self.rust_tokenizer_class is not None:
-                        tokenizer_fast = self.rust_tokenizer_class.from_pretrained(pretrained_name, eos_token=new_eos)
+                        tokenizer_fast = self.get_rust_tokenizer(pretrained_name, eos_token=new_eos)
                         self.assertEqual(tokenizer_fast._special_tokens_map["eos_token"], new_eos)
                         self.assertIn(new_eos, list(tokenizer_fast.added_tokens_decoder.values()))
                         # We can't test the following because for BC we kept the default rstrip lstrip in slow not fast. Will comment once normalization is alright

tests/tokenization/test_tokenization_fast.py

@@ -33,19 +33,20 @@ class PreTrainedTokenizationFastTest(TokenizerTesterMixin, unittest.TestCase):
     test_rust_tokenizer = True
     from_pretrained_vocab_key = "tokenizer_file"
 
-    def setUp(self):
-        self.test_rust_tokenizer = False  # because we don't have pretrained_vocab_files_map
-        super().setUp()
-        self.test_rust_tokenizer = True
+    @classmethod
+    def setUpClass(cls):
+        cls.test_rust_tokenizer = False  # because we don't have pretrained_vocab_files_map
+        super().setUpClass()
+        cls.test_rust_tokenizer = True
 
         model_paths = ["robot-test/dummy-tokenizer-fast", "robot-test/dummy-tokenizer-wordlevel"]
-        self.bytelevel_bpe_model_name = "SaulLu/dummy-tokenizer-bytelevel-bpe"
+        cls.bytelevel_bpe_model_name = "SaulLu/dummy-tokenizer-bytelevel-bpe"
 
         # Inclusion of 2 tokenizers to test different types of models (Unigram and WordLevel for the moment)
-        self.tokenizers_list = [(PreTrainedTokenizerFast, model_path, {}) for model_path in model_paths]
+        cls.tokenizers_list = [(PreTrainedTokenizerFast, model_path, {}) for model_path in model_paths]
 
         tokenizer = PreTrainedTokenizerFast.from_pretrained(model_paths[0])
-        tokenizer.save_pretrained(self.tmpdirname)
+        tokenizer.save_pretrained(cls.tmpdirname)
 
     @unittest.skip(
         "We disable this test for PreTrainedTokenizerFast because it is the only tokenizer that is not linked to any model"