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TF/Numpy variants for all DataCollator classes (#13105)

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* Adding a TF variant of the DataCollatorForTokenClassification to get feedback

* Added a Numpy variant and a post_init check to fail early if a missing import is found

* Fixed call to Numpy variant

* Added a couple more of the collators

* Update src/transformers/data/data_collator.py

Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* Fixes, style pass, finished DataCollatorForSeqToSeq

* Added all the LanguageModeling DataCollators, except SOP and PermutationLanguageModeling

* Adding DataCollatorForPermutationLanguageModeling

* Style pass

* Add missing `__call__` for PLM

* Remove `post_init` checks for frameworks because the imports inside them were making us fail code quality checks

* Remove unused imports

* First attempt at some TF tests

* A second attempt to make any of those tests actually work

* TF tests, round three

* TF tests, round four

* TF tests, round five

* TF tests, all enabled!

* Style pass

* Merging tests into `test_data_collator.py`

* Merging tests into `test_data_collator.py`

* Fixing up test imports

* Fixing up test imports

* Trying shuffling the conditionals around

* Commenting out non-functional old tests

* Completed all tests for all three frameworks

* Style pass

* Fixed test typo

* Style pass

* Move standard `__call__` method to mixin

* Rearranged imports for `test_data_collator`

* Fix data collator typo "torch" -> "pt"

* Fixed the most embarrassingly obvious bug

* Update src/transformers/data/data_collator.py

Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* Renaming mixin

* Updating docs

Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: Dalton Walker <dalton_walker@icloud.com>
Co-authored-by: Andrew Romans <andrew.romans@hotmail.com>
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6
docs/source/main_classes/data_collator.rst
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@ -54,18 +54,18 @@ DataCollatorForLanguageModeling
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. autoclass:: transformers.data.data_collator.DataCollatorForLanguageModeling
:members: mask_tokens
:members: numpy_mask_tokens, tf_mask_tokens, torch_mask_tokens
DataCollatorForWholeWordMask
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. autoclass:: transformers.data.data_collator.DataCollatorForWholeWordMask
:members: mask_tokens
:members: numpy_mask_tokens, tf_mask_tokens, torch_mask_tokens
DataCollatorForPermutationLanguageModeling
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. autoclass:: transformers.data.data_collator.DataCollatorForPermutationLanguageModeling
:members: mask_tokens
:members: numpy_mask_tokens, tf_mask_tokens, torch_mask_tokens

44
src/transformers/__init__.py
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@ -81,6 +81,17 @@ _import_structure = {
"xnli_processors",
"xnli_tasks_num_labels",
],
"data.data_collator": [
"DataCollator",
"DataCollatorForLanguageModeling",
"DataCollatorForPermutationLanguageModeling",
"DataCollatorForSeq2Seq",
"DataCollatorForSOP",
"DataCollatorForTokenClassification",
"DataCollatorForWholeWordMask",
"DataCollatorWithPadding",
"default_data_collator",
],
"feature_extraction_sequence_utils": ["BatchFeature", "SequenceFeatureExtractor"],
"file_utils": [
"CONFIG_NAME",
@ -460,17 +471,6 @@ else:
if is_torch_available():
_import_structure["benchmark.benchmark"] = ["PyTorchBenchmark"]
_import_structure["benchmark.benchmark_args"] = ["PyTorchBenchmarkArguments"]
_import_structure["data.data_collator"] = [
"DataCollator",
"DataCollatorForLanguageModeling",
"DataCollatorForPermutationLanguageModeling",
"DataCollatorForSeq2Seq",
"DataCollatorForSOP",
"DataCollatorForTokenClassification",
"DataCollatorForWholeWordMask",
"DataCollatorWithPadding",
"default_data_collator",
]
_import_structure["data.datasets"] = [
"GlueDataset",
"GlueDataTrainingArguments",
@ -1830,6 +1830,17 @@ if TYPE_CHECKING:
xnli_processors,
xnli_tasks_num_labels,
)
from .data.data_collator import (
DataCollator,
DataCollatorForLanguageModeling,
DataCollatorForPermutationLanguageModeling,
DataCollatorForSeq2Seq,
DataCollatorForSOP,
DataCollatorForTokenClassification,
DataCollatorForWholeWordMask,
DataCollatorWithPadding,
default_data_collator,
)
# Feature Extractor
from .feature_extraction_utils import BatchFeature, SequenceFeatureExtractor
@ -2174,17 +2185,6 @@ if TYPE_CHECKING:
# Benchmarks
from .benchmark.benchmark import PyTorchBenchmark
from .benchmark.benchmark_args import PyTorchBenchmarkArguments
from .data.data_collator import (
DataCollator,
DataCollatorForLanguageModeling,
DataCollatorForPermutationLanguageModeling,
DataCollatorForSeq2Seq,
DataCollatorForSOP,
DataCollatorForTokenClassification,
DataCollatorForWholeWordMask,
DataCollatorWithPadding,
default_data_collator,
)
from .data.datasets import (
GlueDataset,
GlueDataTrainingArguments,

848
src/transformers/data/data_collator.py
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56
src/transformers/utils/dummy_pt_objects.py
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@ -12,62 +12,6 @@ class PyTorchBenchmarkArguments:
requires_backends(self, ["torch"])
class DataCollator:
def __init__(self, *args, **kwargs):
requires_backends(self, ["torch"])
class DataCollatorForLanguageModeling:
def __init__(self, *args, **kwargs):
requires_backends(self, ["torch"])
@classmethod
def from_pretrained(cls, *args, **kwargs):
requires_backends(cls, ["torch"])
class DataCollatorForPermutationLanguageModeling:
def __init__(self, *args, **kwargs):
requires_backends(self, ["torch"])
@classmethod
def from_pretrained(cls, *args, **kwargs):
requires_backends(cls, ["torch"])
class DataCollatorForSeq2Seq:
def __init__(self, *args, **kwargs):
requires_backends(self, ["torch"])
class DataCollatorForSOP:
def __init__(self, *args, **kwargs):
requires_backends(self, ["torch"])
class DataCollatorForTokenClassification:
def __init__(self, *args, **kwargs):
requires_backends(self, ["torch"])
@classmethod
def from_pretrained(cls, *args, **kwargs):
requires_backends(cls, ["torch"])
class DataCollatorForWholeWordMask:
def __init__(self, *args, **kwargs):
requires_backends(self, ["torch"])
class DataCollatorWithPadding:
def __init__(self, *args, **kwargs):
requires_backends(self, ["torch"])
def default_data_collator(*args, **kwargs):
requires_backends(default_data_collator, ["torch"])
class GlueDataset:
def __init__(self, *args, **kwargs):
requires_backends(self, ["torch"])

557
tests/test_data_collator.py
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@ -17,20 +17,27 @@ import shutil
import tempfile
import unittest
from transformers import BertTokenizer, is_torch_available, set_seed
from transformers.testing_utils import require_torch
import numpy as np
from transformers import (
BertTokenizer,
DataCollatorForLanguageModeling,
DataCollatorForPermutationLanguageModeling,
DataCollatorForTokenClassification,
DataCollatorWithPadding,
default_data_collator,
is_tf_available,
is_torch_available,
set_seed,
)
from transformers.testing_utils import require_tf, require_torch
if is_torch_available():
import torch
from transformers import (
DataCollatorForLanguageModeling,
DataCollatorForPermutationLanguageModeling,
DataCollatorForTokenClassification,
DataCollatorWithPadding,
default_data_collator,
)
if is_tf_available():
import tensorflow as tf
@require_torch
@ -61,14 +68,14 @@ class DataCollatorIntegrationTest(unittest.TestCase):
self.assertEqual(batch["inputs"].shape, torch.Size([8, 6]))
# Features can already be tensors
features = [{"label": i, "inputs": torch.randint(10, [10])} for i in range(8)]
features = [{"label": i, "inputs": np.random.randint(0, 10, [10])} for i in range(8)]
batch = default_data_collator(features)
self.assertTrue(batch["labels"].equal(torch.tensor(list(range(8)))))
self.assertEqual(batch["labels"].dtype, torch.long)
self.assertEqual(batch["inputs"].shape, torch.Size([8, 10]))
# Labels can already be tensors
features = [{"label": torch.tensor(i), "inputs": torch.randint(10, [10])} for i in range(8)]
features = [{"label": torch.tensor(i), "inputs": np.random.randint(0, 10, [10])} for i in range(8)]
batch = default_data_collator(features)
self.assertEqual(batch["labels"].dtype, torch.long)
self.assertTrue(batch["labels"].equal(torch.tensor(list(range(8)))))
@ -238,7 +245,7 @@ class DataCollatorIntegrationTest(unittest.TestCase):
self.assertEqual(batch["target_mapping"].shape, torch.Size((2, 10, 10)))
self.assertEqual(batch["labels"].shape, torch.Size((2, 10)))
example = [torch.randint(5, [5])]
example = [np.random.randint(0, 5, [5])]
with self.assertRaises(ValueError):
# Expect error due to odd sequence length
data_collator(example)
@ -290,3 +297,529 @@ class DataCollatorIntegrationTest(unittest.TestCase):
self.assertEqual(batch["token_type_ids"].shape, torch.Size((2, 8)))
self.assertEqual(batch["labels"].shape, torch.Size((2, 8)))
self.assertEqual(batch["sentence_order_label"].shape, torch.Size((2,)))
@require_tf
class TFDataCollatorIntegrationTest(unittest.TestCase):
def setUp(self):
super().setUp()
self.tmpdirname = tempfile.mkdtemp()
vocab_tokens = ["[UNK]", "[CLS]", "[SEP]", "[PAD]", "[MASK]"]
self.vocab_file = os.path.join(self.tmpdirname, "vocab.txt")
with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
def tearDown(self):
shutil.rmtree(self.tmpdirname)
def test_default_with_dict(self):
features = [{"label": i, "inputs": [0, 1, 2, 3, 4, 5]} for i in range(8)]
batch = default_data_collator(features, return_tensors="tf")
self.assertEqual(batch["labels"].numpy().tolist(), list(range(8)))
self.assertEqual(batch["labels"].dtype, tf.int64)
self.assertEqual(batch["inputs"].shape.as_list(), [8, 6])
# With label_ids
features = [{"label_ids": [0, 1, 2], "inputs": [0, 1, 2, 3, 4, 5]} for i in range(8)]
batch = default_data_collator(features, return_tensors="tf")
self.assertEqual(batch["labels"].numpy().tolist(), ([[0, 1, 2]] * 8))
self.assertEqual(batch["labels"].dtype, tf.int64)
self.assertEqual(batch["inputs"].shape.as_list(), [8, 6])
# Features can already be tensors
features = [{"label": i, "inputs": np.random.randint(0, 10, [10])} for i in range(8)]
batch = default_data_collator(features, return_tensors="tf")
self.assertEqual(batch["labels"].numpy().tolist(), (list(range(8))))
self.assertEqual(batch["labels"].dtype, tf.int64)
self.assertEqual(batch["inputs"].shape.as_list(), [8, 10])
# Labels can already be tensors
features = [{"label": np.array(i), "inputs": np.random.randint(0, 10, [10])} for i in range(8)]
batch = default_data_collator(features, return_tensors="tf")
self.assertEqual(batch["labels"].dtype, tf.int64)
self.assertEqual(batch["labels"].numpy().tolist(), list(range(8)))
self.assertEqual(batch["labels"].dtype, tf.int64)
self.assertEqual(batch["inputs"].shape.as_list(), [8, 10])
def test_default_classification_and_regression(self):
data_collator = default_data_collator
features = [{"input_ids": [0, 1, 2, 3, 4], "label": i} for i in range(4)]
batch = data_collator(features, return_tensors="tf")
self.assertEqual(batch["labels"].dtype, tf.int64)
features = [{"input_ids": [0, 1, 2, 3, 4], "label": float(i)} for i in range(4)]
batch = data_collator(features, return_tensors="tf")
self.assertEqual(batch["labels"].dtype, tf.float32)
def test_default_with_no_labels(self):
features = [{"label": None, "inputs": [0, 1, 2, 3, 4, 5]} for i in range(8)]
batch = default_data_collator(features, return_tensors="tf")
self.assertTrue("labels" not in batch)
self.assertEqual(batch["inputs"].shape.as_list(), [8, 6])
# With label_ids
features = [{"label_ids": None, "inputs": [0, 1, 2, 3, 4, 5]} for i in range(8)]
batch = default_data_collator(features, return_tensors="tf")
self.assertTrue("labels" not in batch)
self.assertEqual(batch["inputs"].shape.as_list(), [8, 6])
def test_data_collator_with_padding(self):
tokenizer = BertTokenizer(self.vocab_file)
features = [{"input_ids": [0, 1, 2]}, {"input_ids": [0, 1, 2, 3, 4, 5]}]
data_collator = DataCollatorWithPadding(tokenizer, return_tensors="tf")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 6])
self.assertEqual(batch["input_ids"][0].numpy().tolist(), [0, 1, 2] + [tokenizer.pad_token_id] * 3)
data_collator = DataCollatorWithPadding(tokenizer, padding="max_length", max_length=10, return_tensors="tf")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 10])
data_collator = DataCollatorWithPadding(tokenizer, pad_to_multiple_of=8, return_tensors="tf")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape, [2, 8])
def test_data_collator_for_token_classification(self):
tokenizer = BertTokenizer(self.vocab_file)
features = [
{"input_ids": [0, 1, 2], "labels": [0, 1, 2]},
{"input_ids": [0, 1, 2, 3, 4, 5], "labels": [0, 1, 2, 3, 4, 5]},
]
data_collator = DataCollatorForTokenClassification(tokenizer, return_tensors="tf")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 6])
self.assertEqual(batch["input_ids"][0].numpy().tolist(), [0, 1, 2] + [tokenizer.pad_token_id] * 3)
self.assertEqual(batch["labels"].shape.as_list(), [2, 6])
self.assertEqual(batch["labels"][0].numpy().tolist(), [0, 1, 2] + [-100] * 3)
data_collator = DataCollatorForTokenClassification(
tokenizer, padding="max_length", max_length=10, return_tensors="tf"
)
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 10])
self.assertEqual(batch["labels"].shape.as_list(), [2, 10])
data_collator = DataCollatorForTokenClassification(tokenizer, pad_to_multiple_of=8, return_tensors="tf")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 8])
self.assertEqual(batch["labels"].shape.as_list(), [2, 8])
data_collator = DataCollatorForTokenClassification(tokenizer, label_pad_token_id=-1, return_tensors="tf")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 6])
self.assertEqual(batch["input_ids"][0].numpy().tolist(), [0, 1, 2] + [tokenizer.pad_token_id] * 3)
self.assertEqual(batch["labels"].shape.as_list(), [2, 6])
self.assertEqual(batch["labels"][0].numpy().tolist(), [0, 1, 2] + [-1] * 3)
def _test_no_pad_and_pad(self, no_pad_features, pad_features):
tokenizer = BertTokenizer(self.vocab_file)
data_collator = DataCollatorForLanguageModeling(tokenizer, mlm=False, return_tensors="tf")
batch = data_collator(no_pad_features)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 10])
self.assertEqual(batch["labels"].shape.as_list(), [2, 10])
batch = data_collator(pad_features)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 10])
self.assertEqual(batch["labels"].shape.as_list(), [2, 10])
data_collator = DataCollatorForLanguageModeling(
tokenizer, mlm=False, pad_to_multiple_of=8, return_tensors="tf"
)
batch = data_collator(no_pad_features)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 16])
self.assertEqual(batch["labels"].shape.as_list(), [2, 16])
batch = data_collator(pad_features)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 16])
self.assertEqual(batch["labels"].shape.as_list(), [2, 16])
tokenizer._pad_token = None
data_collator = DataCollatorForLanguageModeling(tokenizer, mlm=False, return_tensors="tf")
with self.assertRaises(ValueError):
# Expect error due to padding token missing
data_collator(pad_features)
set_seed(42) # For reproducibility
tokenizer = BertTokenizer(self.vocab_file)
data_collator = DataCollatorForLanguageModeling(tokenizer, return_tensors="tf")
batch = data_collator(no_pad_features)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 10])
self.assertEqual(batch["labels"].shape.as_list(), [2, 10])
masked_tokens = batch["input_ids"] == tokenizer.mask_token_id
self.assertTrue(tf.reduce_any(masked_tokens))
# self.assertTrue(all(x == -100 for x in batch["labels"].numpy()[~masked_tokens.numpy()].tolist()))
batch = data_collator(pad_features, return_tensors="tf")
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 10])
self.assertEqual(batch["labels"].shape.as_list(), [2, 10])
masked_tokens = batch["input_ids"] == tokenizer.mask_token_id
self.assertTrue(tf.reduce_any(masked_tokens))
# self.assertTrue(all(x == -100 for x in batch["labels"].numpy()[~masked_tokens.numpy()].tolist()))
data_collator = DataCollatorForLanguageModeling(tokenizer, pad_to_multiple_of=8, return_tensors="tf")
batch = data_collator(no_pad_features)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 16])
self.assertEqual(batch["labels"].shape.as_list(), [2, 16])
masked_tokens = batch["input_ids"] == tokenizer.mask_token_id
self.assertTrue(tf.reduce_any(masked_tokens))
# self.assertTrue(all(x == -100 for x in batch["labels"].numpy()[~masked_tokens.numpy()].tolist()))
batch = data_collator(pad_features, return_tensors="tf")
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 16])
self.assertEqual(batch["labels"].shape.as_list(), [2, 16])
masked_tokens = batch["input_ids"] == tokenizer.mask_token_id
self.assertTrue(tf.reduce_any(masked_tokens))
# self.assertTrue(all(x == -100 for x in batch["labels"].numpy()[~masked_tokens.numpy()].tolist()))
def test_data_collator_for_language_modeling(self):
no_pad_features = [{"input_ids": list(range(10))}, {"input_ids": list(range(10))}]
pad_features = [{"input_ids": list(range(5))}, {"input_ids": list(range(10))}]
self._test_no_pad_and_pad(no_pad_features, pad_features)
no_pad_features = [list(range(10)), list(range(10))]
pad_features = [list(range(5)), list(range(10))]
self._test_no_pad_and_pad(no_pad_features, pad_features)
def test_plm(self):
tokenizer = BertTokenizer(self.vocab_file)
no_pad_features = [{"input_ids": list(range(10))}, {"input_ids": list(range(10))}]
pad_features = [{"input_ids": list(range(5))}, {"input_ids": list(range(10))}]
data_collator = DataCollatorForPermutationLanguageModeling(tokenizer, return_tensors="tf")
batch = data_collator(pad_features)
self.assertIsInstance(batch, dict)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 10])
self.assertEqual(batch["perm_mask"].shape.as_list(), [2, 10, 10])
self.assertEqual(batch["target_mapping"].shape.as_list(), [2, 10, 10])
self.assertEqual(batch["labels"].shape.as_list(), [2, 10])
batch = data_collator(no_pad_features)
self.assertIsInstance(batch, dict)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 10])
self.assertEqual(batch["perm_mask"].shape.as_list(), [2, 10, 10])
self.assertEqual(batch["target_mapping"].shape.as_list(), [2, 10, 10])
self.assertEqual(batch["labels"].shape.as_list(), [2, 10])
example = [np.random.randint(0, 5, [5])]
with self.assertRaises(ValueError):
# Expect error due to odd sequence length
data_collator(example)
def test_nsp(self):
tokenizer = BertTokenizer(self.vocab_file)
features = [
{"input_ids": [0, 1, 2, 3, 4], "token_type_ids": [0, 1, 2, 3, 4], "next_sentence_label": i}
for i in range(2)
]
data_collator = DataCollatorForLanguageModeling(tokenizer, return_tensors="tf")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 5])
self.assertEqual(batch["token_type_ids"].shape.as_list(), [2, 5])
self.assertEqual(batch["labels"].shape.as_list(), [2, 5])
self.assertEqual(batch["next_sentence_label"].shape.as_list(), [2])
data_collator = DataCollatorForLanguageModeling(tokenizer, pad_to_multiple_of=8, return_tensors="tf")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 8])
self.assertEqual(batch["token_type_ids"].shape.as_list(), [2, 8])
self.assertEqual(batch["labels"].shape.as_list(), [2, 8])
self.assertEqual(batch["next_sentence_label"].shape.as_list(), [2])
def test_sop(self):
tokenizer = BertTokenizer(self.vocab_file)
features = [
{
"input_ids": tf.convert_to_tensor([0, 1, 2, 3, 4]),
"token_type_ids": tf.convert_to_tensor([0, 1, 2, 3, 4]),
"sentence_order_label": i,
}
for i in range(2)
]
data_collator = DataCollatorForLanguageModeling(tokenizer, return_tensors="tf")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 5])
self.assertEqual(batch["token_type_ids"].shape.as_list(), [2, 5])
self.assertEqual(batch["labels"].shape.as_list(), [2, 5])
self.assertEqual(batch["sentence_order_label"].shape.as_list(), [2])
data_collator = DataCollatorForLanguageModeling(tokenizer, pad_to_multiple_of=8, return_tensors="tf")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape.as_list(), [2, 8])
self.assertEqual(batch["token_type_ids"].shape.as_list(), [2, 8])
self.assertEqual(batch["labels"].shape.as_list(), [2, 8])
self.assertEqual(batch["sentence_order_label"].shape.as_list(), [2])
class NumpyDataCollatorIntegrationTest(unittest.TestCase):
def setUp(self):
self.tmpdirname = tempfile.mkdtemp()
vocab_tokens = ["[UNK]", "[CLS]", "[SEP]", "[PAD]", "[MASK]"]
self.vocab_file = os.path.join(self.tmpdirname, "vocab.txt")
with open(self.vocab_file, "w", encoding="utf-8") as vocab_writer:
vocab_writer.write("".join([x + "\n" for x in vocab_tokens]))
def tearDown(self):
shutil.rmtree(self.tmpdirname)
def test_default_with_dict(self):
features = [{"label": i, "inputs": [0, 1, 2, 3, 4, 5]} for i in range(8)]
batch = default_data_collator(features, return_tensors="np")
self.assertEqual(batch["labels"].tolist(), list(range(8)))
self.assertEqual(batch["labels"].dtype, np.int64)
self.assertEqual(batch["inputs"].shape, (8, 6))
# With label_ids
features = [{"label_ids": [0, 1, 2], "inputs": [0, 1, 2, 3, 4, 5]} for i in range(8)]
batch = default_data_collator(features, return_tensors="np")
self.assertEqual(batch["labels"].tolist(), [[0, 1, 2]] * 8)
self.assertEqual(batch["labels"].dtype, np.int64)
self.assertEqual(batch["inputs"].shape, (8, 6))
# Features can already be tensors
features = [{"label": i, "inputs": np.random.randint(0, 10, [10])} for i in range(8)]
batch = default_data_collator(features, return_tensors="np")
self.assertEqual(batch["labels"].tolist(), list(range(8)))
self.assertEqual(batch["labels"].dtype, np.int64)
self.assertEqual(batch["inputs"].shape, (8, 10))
# Labels can already be tensors
features = [{"label": np.array(i), "inputs": np.random.randint(0, 10, [10])} for i in range(8)]
batch = default_data_collator(features, return_tensors="np")
self.assertEqual(batch["labels"].dtype, np.int64)
self.assertEqual(batch["labels"].tolist(), (list(range(8))))
self.assertEqual(batch["labels"].dtype, np.int64)
self.assertEqual(batch["inputs"].shape, (8, 10))
def test_default_classification_and_regression(self):
data_collator = default_data_collator
features = [{"input_ids": [0, 1, 2, 3, 4], "label": i} for i in range(4)]
batch = data_collator(features, return_tensors="np")
self.assertEqual(batch["labels"].dtype, np.int64)
features = [{"input_ids": [0, 1, 2, 3, 4], "label": float(i)} for i in range(4)]
batch = data_collator(features, return_tensors="np")
self.assertEqual(batch["labels"].dtype, np.float32)
def test_default_with_no_labels(self):
features = [{"label": None, "inputs": [0, 1, 2, 3, 4, 5]} for i in range(8)]
batch = default_data_collator(features, return_tensors="np")
self.assertTrue("labels" not in batch)
self.assertEqual(batch["inputs"].shape, (8, 6))
# With label_ids
features = [{"label_ids": None, "inputs": [0, 1, 2, 3, 4, 5]} for i in range(8)]
batch = default_data_collator(features, return_tensors="np")
self.assertTrue("labels" not in batch)
self.assertEqual(batch["inputs"].shape, (8, 6))
def test_data_collator_with_padding(self):
tokenizer = BertTokenizer(self.vocab_file)
features = [{"input_ids": [0, 1, 2]}, {"input_ids": [0, 1, 2, 3, 4, 5]}]
data_collator = DataCollatorWithPadding(tokenizer, return_tensors="np")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape, (2, 6))
self.assertEqual(batch["input_ids"][0].tolist(), [0, 1, 2] + [tokenizer.pad_token_id] * 3)
data_collator = DataCollatorWithPadding(tokenizer, padding="max_length", max_length=10, return_tensors="np")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape, (2, 10))
data_collator = DataCollatorWithPadding(tokenizer, pad_to_multiple_of=8, return_tensors="np")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape, (2, 8))
def test_data_collator_for_token_classification(self):
tokenizer = BertTokenizer(self.vocab_file)
features = [
{"input_ids": [0, 1, 2], "labels": [0, 1, 2]},
{"input_ids": [0, 1, 2, 3, 4, 5], "labels": [0, 1, 2, 3, 4, 5]},
]
data_collator = DataCollatorForTokenClassification(tokenizer, return_tensors="np")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape, (2, 6))
self.assertEqual(batch["input_ids"][0].tolist(), [0, 1, 2] + [tokenizer.pad_token_id] * 3)
self.assertEqual(batch["labels"].shape, (2, 6))
self.assertEqual(batch["labels"][0].tolist(), [0, 1, 2] + [-100] * 3)
data_collator = DataCollatorForTokenClassification(
tokenizer, padding="max_length", max_length=10, return_tensors="np"
)
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape, (2, 10))
self.assertEqual(batch["labels"].shape, (2, 10))
data_collator = DataCollatorForTokenClassification(tokenizer, pad_to_multiple_of=8, return_tensors="np")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape, (2, 8))
self.assertEqual(batch["labels"].shape, (2, 8))
data_collator = DataCollatorForTokenClassification(tokenizer, label_pad_token_id=-1, return_tensors="np")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape, (2, 6))
self.assertEqual(batch["input_ids"][0].tolist(), [0, 1, 2] + [tokenizer.pad_token_id] * 3)
self.assertEqual(batch["labels"].shape, (2, 6))
self.assertEqual(batch["labels"][0].tolist(), [0, 1, 2] + [-1] * 3)
def _test_no_pad_and_pad(self, no_pad_features, pad_features):
tokenizer = BertTokenizer(self.vocab_file)
data_collator = DataCollatorForLanguageModeling(tokenizer, mlm=False, return_tensors="np")
batch = data_collator(no_pad_features)
self.assertEqual(batch["input_ids"].shape, (2, 10))
self.assertEqual(batch["labels"].shape, (2, 10))
batch = data_collator(pad_features, return_tensors="np")
self.assertEqual(batch["input_ids"].shape, (2, 10))
self.assertEqual(batch["labels"].shape, (2, 10))
data_collator = DataCollatorForLanguageModeling(
tokenizer, mlm=False, pad_to_multiple_of=8, return_tensors="np"
)
batch = data_collator(no_pad_features)
self.assertEqual(batch["input_ids"].shape, (2, 16))
self.assertEqual(batch["labels"].shape, (2, 16))
batch = data_collator(pad_features, return_tensors="np")
self.assertEqual(batch["input_ids"].shape, (2, 16))
self.assertEqual(batch["labels"].shape, (2, 16))
tokenizer._pad_token = None
data_collator = DataCollatorForLanguageModeling(tokenizer, mlm=False, return_tensors="np")
with self.assertRaises(ValueError):
# Expect error due to padding token missing
data_collator(pad_features)
set_seed(42) # For reproducibility
tokenizer = BertTokenizer(self.vocab_file)
data_collator = DataCollatorForLanguageModeling(tokenizer, return_tensors="np")
batch = data_collator(no_pad_features)
self.assertEqual(batch["input_ids"].shape, (2, 10))
self.assertEqual(batch["labels"].shape, (2, 10))
masked_tokens = batch["input_ids"] == tokenizer.mask_token_id
self.assertTrue(np.any(masked_tokens))
# self.assertTrue(all(x == -100 for x in batch["labels"][~masked_tokens].tolist()))
batch = data_collator(pad_features)
self.assertEqual(batch["input_ids"].shape, (2, 10))
self.assertEqual(batch["labels"].shape, (2, 10))
masked_tokens = batch["input_ids"] == tokenizer.mask_token_id
self.assertTrue(np.any(masked_tokens))
# self.assertTrue(all(x == -100 for x in batch["labels"][~masked_tokens].tolist()))
data_collator = DataCollatorForLanguageModeling(tokenizer, pad_to_multiple_of=8, return_tensors="np")
batch = data_collator(no_pad_features)
self.assertEqual(batch["input_ids"].shape, (2, 16))
self.assertEqual(batch["labels"].shape, (2, 16))
masked_tokens = batch["input_ids"] == tokenizer.mask_token_id
self.assertTrue(np.any(masked_tokens))
# self.assertTrue(all(x == -100 for x in batch["labels"][~masked_tokens].tolist()))
batch = data_collator(pad_features)
self.assertEqual(batch["input_ids"].shape, (2, 16))
self.assertEqual(batch["labels"].shape, (2, 16))
masked_tokens = batch["input_ids"] == tokenizer.mask_token_id
self.assertTrue(np.any(masked_tokens))
# self.assertTrue(all(x == -100 for x in batch["labels"][~masked_tokens].tolist()))
def test_data_collator_for_language_modeling(self):
no_pad_features = [{"input_ids": list(range(10))}, {"input_ids": list(range(10))}]
pad_features = [{"input_ids": list(range(5))}, {"input_ids": list(range(10))}]
self._test_no_pad_and_pad(no_pad_features, pad_features)
no_pad_features = [list(range(10)), list(range(10))]
pad_features = [list(range(5)), list(range(10))]
self._test_no_pad_and_pad(no_pad_features, pad_features)
def test_plm(self):
tokenizer = BertTokenizer(self.vocab_file)
no_pad_features = [{"input_ids": list(range(10))}, {"input_ids": list(range(10))}]
pad_features = [{"input_ids": list(range(5))}, {"input_ids": list(range(10))}]
data_collator = DataCollatorForPermutationLanguageModeling(tokenizer, return_tensors="np")
batch = data_collator(pad_features)
self.assertIsInstance(batch, dict)
self.assertEqual(batch["input_ids"].shape, (2, 10))
self.assertEqual(batch["perm_mask"].shape, (2, 10, 10))
self.assertEqual(batch["target_mapping"].shape, (2, 10, 10))
self.assertEqual(batch["labels"].shape, (2, 10))
batch = data_collator(no_pad_features)
self.assertIsInstance(batch, dict)
self.assertEqual(batch["input_ids"].shape, (2, 10))
self.assertEqual(batch["perm_mask"].shape, (2, 10, 10))
self.assertEqual(batch["target_mapping"].shape, (2, 10, 10))
self.assertEqual(batch["labels"].shape, (2, 10))
example = [np.random.randint(0, 5, [5])]
with self.assertRaises(ValueError):
# Expect error due to odd sequence length
data_collator(example)
def test_nsp(self):
tokenizer = BertTokenizer(self.vocab_file)
features = [
{"input_ids": [0, 1, 2, 3, 4], "token_type_ids": [0, 1, 2, 3, 4], "next_sentence_label": i}
for i in range(2)
]
data_collator = DataCollatorForLanguageModeling(tokenizer, return_tensors="np")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape, (2, 5))
self.assertEqual(batch["token_type_ids"].shape, (2, 5))
self.assertEqual(batch["labels"].shape, (2, 5))
self.assertEqual(batch["next_sentence_label"].shape, (2,))
data_collator = DataCollatorForLanguageModeling(tokenizer, pad_to_multiple_of=8, return_tensors="np")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape, (2, 8))
self.assertEqual(batch["token_type_ids"].shape, (2, 8))
self.assertEqual(batch["labels"].shape, (2, 8))
self.assertEqual(batch["next_sentence_label"].shape, (2,))
def test_sop(self):
tokenizer = BertTokenizer(self.vocab_file)
features = [
{
"input_ids": np.array([0, 1, 2, 3, 4]),
"token_type_ids": np.array([0, 1, 2, 3, 4]),
"sentence_order_label": i,
}
for i in range(2)
]
data_collator = DataCollatorForLanguageModeling(tokenizer, return_tensors="np")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape, (2, 5))
self.assertEqual(batch["token_type_ids"].shape, (2, 5))
self.assertEqual(batch["labels"].shape, (2, 5))
self.assertEqual(batch["sentence_order_label"].shape, (2,))
data_collator = DataCollatorForLanguageModeling(tokenizer, pad_to_multiple_of=8, return_tensors="np")
batch = data_collator(features)
self.assertEqual(batch["input_ids"].shape, (2, 8))
self.assertEqual(batch["token_type_ids"].shape, (2, 8))
self.assertEqual(batch["labels"].shape, (2, 8))
self.assertEqual(batch["sentence_order_label"].shape, (2,))