# coding=utf-8 # Copyright 2020 HuggingFace Inc. team. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. import os import tempfile import unittest import numpy as np from transformers import is_tf_available, is_torch_available from transformers.testing_utils import is_pt_tf_cross_test, require_tf, require_torch, slow, torch_device from .test_modeling_tf_bert import TFBertModelTester from .test_modeling_tf_common import ids_tensor from .test_modeling_tf_rembert import TFRemBertModelTester from .test_modeling_tf_roberta import TFRobertaModelTester if is_tf_available(): from transformers import ( AutoConfig, AutoTokenizer, EncoderDecoderConfig, TFAutoModel, TFAutoModelForCausalLM, TFBertLMHeadModel, TFBertModel, TFEncoderDecoderModel, TFRemBertForCausalLM, TFRemBertModel, TFRobertaForCausalLM, TFRobertaModel, ) from transformers.modeling_tf_outputs import TFBaseModelOutput if is_torch_available(): import torch from transformers import BertLMHeadModel, BertModel, EncoderDecoderModel @require_tf class TFEncoderDecoderMixin: def get_encoder_decoder_model(self, config, decoder_config): raise NotImplementedError def prepare_config_and_inputs(self): raise NotImplementedError def get_pretrained_model(self): raise NotImplementedError def check_encoder_decoder_model_from_pretrained_configs( self, config, input_ids, attention_mask, encoder_hidden_states, decoder_config, decoder_input_ids, decoder_attention_mask, **kwargs ): encoder_decoder_config = EncoderDecoderConfig.from_encoder_decoder_configs(config, decoder_config) self.assertTrue(encoder_decoder_config.decoder.is_decoder) enc_dec_model = TFEncoderDecoderModel(encoder_decoder_config) self.assertTrue(enc_dec_model.config.is_encoder_decoder) outputs_encoder_decoder = enc_dec_model( input_ids=input_ids, decoder_input_ids=decoder_input_ids, attention_mask=attention_mask, decoder_attention_mask=decoder_attention_mask, ) self.assertEqual( outputs_encoder_decoder["logits"].shape, (decoder_input_ids.shape + (decoder_config.vocab_size,)) ) self.assertEqual( outputs_encoder_decoder["encoder_last_hidden_state"].shape, (input_ids.shape + (config.hidden_size,)) ) def check_encoder_decoder_model( self, config, input_ids, attention_mask, encoder_hidden_states, decoder_config, decoder_input_ids, decoder_attention_mask, **kwargs ): encoder_model, decoder_model = self.get_encoder_decoder_model(config, decoder_config) enc_dec_model = TFEncoderDecoderModel(encoder=encoder_model, decoder=decoder_model) self.assertTrue(enc_dec_model.config.decoder.is_decoder) self.assertTrue(enc_dec_model.config.decoder.add_cross_attention) self.assertTrue(enc_dec_model.config.is_encoder_decoder) outputs_encoder_decoder = enc_dec_model( input_ids=input_ids, decoder_input_ids=decoder_input_ids, attention_mask=attention_mask, decoder_attention_mask=decoder_attention_mask, ) self.assertEqual( outputs_encoder_decoder["logits"].shape, (decoder_input_ids.shape + (decoder_config.vocab_size,)) ) self.assertEqual( outputs_encoder_decoder["encoder_last_hidden_state"].shape, (input_ids.shape + (config.hidden_size,)) ) encoder_outputs = TFBaseModelOutput(last_hidden_state=encoder_hidden_states) outputs_encoder_decoder = enc_dec_model( input_ids=None, encoder_outputs=encoder_outputs, decoder_input_ids=decoder_input_ids, attention_mask=attention_mask, decoder_attention_mask=decoder_attention_mask, ) self.assertEqual( outputs_encoder_decoder["logits"].shape, (decoder_input_ids.shape + (decoder_config.vocab_size,)) ) self.assertEqual( outputs_encoder_decoder["encoder_last_hidden_state"].shape, (input_ids.shape + (config.hidden_size,)) ) def check_encoder_decoder_model_from_pretrained( self, config, input_ids, attention_mask, encoder_hidden_states, decoder_config, decoder_input_ids, decoder_attention_mask, return_dict, **kwargs ): encoder_model, decoder_model = self.get_encoder_decoder_model(config, decoder_config) kwargs = {"encoder_model": encoder_model, "decoder_model": decoder_model, "return_dict": return_dict} enc_dec_model = TFEncoderDecoderModel.from_encoder_decoder_pretrained(**kwargs) outputs_encoder_decoder = enc_dec_model( input_ids=input_ids, decoder_input_ids=decoder_input_ids, attention_mask=attention_mask, decoder_attention_mask=decoder_attention_mask, return_dict=True, ) self.assertEqual( outputs_encoder_decoder["logits"].shape, (decoder_input_ids.shape + (decoder_config.vocab_size,)) ) self.assertEqual( outputs_encoder_decoder["encoder_last_hidden_state"].shape, (input_ids.shape + (config.hidden_size,)) ) def check_save_and_load( self, config, input_ids, attention_mask, encoder_hidden_states, decoder_config, decoder_input_ids, decoder_attention_mask, **kwargs ): encoder_model, decoder_model = self.get_encoder_decoder_model(config, decoder_config) enc_dec_model = TFEncoderDecoderModel(encoder=encoder_model, decoder=decoder_model) outputs = enc_dec_model( input_ids=input_ids, decoder_input_ids=decoder_input_ids, attention_mask=attention_mask, decoder_attention_mask=decoder_attention_mask, ) out_2 = np.array(outputs[0]) out_2[np.isnan(out_2)] = 0 with tempfile.TemporaryDirectory() as tmpdirname: enc_dec_model.save_pretrained(tmpdirname) enc_dec_model = TFEncoderDecoderModel.from_pretrained(tmpdirname) after_outputs = enc_dec_model( input_ids=input_ids, decoder_input_ids=decoder_input_ids, attention_mask=attention_mask, decoder_attention_mask=decoder_attention_mask, ) out_1 = np.array(after_outputs[0]) out_1[np.isnan(out_1)] = 0 max_diff = np.amax(np.abs(out_1 - out_2)) self.assertLessEqual(max_diff, 1e-5) def check_encoder_decoder_model_labels( self, config, input_ids, attention_mask, encoder_hidden_states, decoder_config, decoder_input_ids, decoder_attention_mask, labels, **kwargs ): encoder_model, decoder_model = self.get_encoder_decoder_model(config, decoder_config) enc_dec_model = TFEncoderDecoderModel(encoder=encoder_model, decoder=decoder_model) outputs_encoder_decoder = enc_dec_model( input_ids=input_ids, decoder_input_ids=decoder_input_ids, attention_mask=attention_mask, decoder_attention_mask=decoder_attention_mask, labels=labels, ) # Make sure `loss` exist assert "loss" in outputs_encoder_decoder batch_size, seq_len = decoder_input_ids.shape expected_shape = (batch_size, seq_len - 1, decoder_config.vocab_size) self.assertEqual(outputs_encoder_decoder["logits"].shape, expected_shape) self.assertEqual( outputs_encoder_decoder["encoder_last_hidden_state"].shape, (input_ids.shape + (config.hidden_size,)) ) def check_encoder_decoder_model_output_attentions( self, config, input_ids, attention_mask, encoder_hidden_states, decoder_config, decoder_input_ids, decoder_attention_mask, **kwargs ): # make the decoder inputs a different shape from the encoder inputs to harden the test decoder_input_ids = decoder_input_ids[:, :-1] decoder_attention_mask = decoder_attention_mask[:, :-1] encoder_model, decoder_model = self.get_encoder_decoder_model(config, decoder_config) enc_dec_model = TFEncoderDecoderModel(encoder=encoder_model, decoder=decoder_model) outputs_encoder_decoder = enc_dec_model( input_ids=input_ids, decoder_input_ids=decoder_input_ids, attention_mask=attention_mask, decoder_attention_mask=decoder_attention_mask, output_attentions=True, ) encoder_attentions = outputs_encoder_decoder["encoder_attentions"] self.assertEqual(len(encoder_attentions), config.num_hidden_layers) self.assertEqual( encoder_attentions[0].shape[-3:], (config.num_attention_heads, input_ids.shape[-1], input_ids.shape[-1]) ) decoder_attentions = outputs_encoder_decoder["decoder_attentions"] num_decoder_layers = ( decoder_config.num_decoder_layers if hasattr(decoder_config, "num_decoder_layers") else decoder_config.num_hidden_layers ) self.assertEqual(len(decoder_attentions), num_decoder_layers) self.assertEqual( decoder_attentions[0].shape[-3:], (decoder_config.num_attention_heads, decoder_input_ids.shape[-1], decoder_input_ids.shape[-1]), ) cross_attentions = outputs_encoder_decoder["cross_attentions"] self.assertEqual(len(cross_attentions), num_decoder_layers) cross_attention_input_seq_len = decoder_input_ids.shape[-1] * ( 1 + (decoder_config.ngram if hasattr(decoder_config, "ngram") else 0) ) self.assertEqual( cross_attentions[0].shape[-3:], (decoder_config.num_attention_heads, cross_attention_input_seq_len, input_ids.shape[-1]), ) def check_encoder_decoder_model_generate(self, input_ids, config, decoder_config, **kwargs): encoder_model, decoder_model = self.get_encoder_decoder_model(config, decoder_config) enc_dec_model = TFEncoderDecoderModel(encoder=encoder_model, decoder=decoder_model) # Bert does not have a bos token id, so use pad_token_id instead generated_output = enc_dec_model.generate( input_ids, decoder_start_token_id=enc_dec_model.config.decoder.pad_token_id ) self.assertEqual(tuple(generated_output.shape.as_list()), (input_ids.shape[0],) + (decoder_config.max_length,)) def test_encoder_decoder_model(self): input_ids_dict = self.prepare_config_and_inputs() self.check_encoder_decoder_model(**input_ids_dict) def test_encoder_decoder_model_from_pretrained_configs(self): input_ids_dict = self.prepare_config_and_inputs() self.check_encoder_decoder_model_from_pretrained_configs(**input_ids_dict) def test_encoder_decoder_model_from_pretrained(self): input_ids_dict = self.prepare_config_and_inputs() self.check_encoder_decoder_model_from_pretrained(**input_ids_dict, return_dict=False) def test_encoder_decoder_model_from_pretrained_return_dict(self): input_ids_dict = self.prepare_config_and_inputs() self.check_encoder_decoder_model_from_pretrained(**input_ids_dict, return_dict=True) def test_save_and_load_from_pretrained(self): input_ids_dict = self.prepare_config_and_inputs() self.check_save_and_load(**input_ids_dict) def test_encoder_decoder_model_labels(self): input_ids_dict = self.prepare_config_and_inputs() self.check_encoder_decoder_model_labels(**input_ids_dict) def test_encoder_decoder_model_output_attentions(self): input_ids_dict = self.prepare_config_and_inputs() self.check_encoder_decoder_model_output_attentions(**input_ids_dict) def test_encoder_decoder_model_generate(self): input_ids_dict = self.prepare_config_and_inputs() self.check_encoder_decoder_model_generate(**input_ids_dict) @slow def test_real_model_save_load_from_pretrained(self): model_2 = self.get_pretrained_model() input_ids = ids_tensor([13, 5], model_2.config.encoder.vocab_size) decoder_input_ids = ids_tensor([13, 1], model_2.config.encoder.vocab_size) attention_mask = ids_tensor([13, 5], vocab_size=2) outputs = model_2( input_ids=input_ids, decoder_input_ids=decoder_input_ids, attention_mask=attention_mask, ) out_2 = np.array(outputs[0]) out_2[np.isnan(out_2)] = 0 with tempfile.TemporaryDirectory() as tmp_dirname: model_2.save_pretrained(tmp_dirname) model_1 = TFEncoderDecoderModel.from_pretrained(tmp_dirname) after_outputs = model_1( input_ids=input_ids, decoder_input_ids=decoder_input_ids, attention_mask=attention_mask, ) out_1 = np.array(after_outputs[0]) out_1[np.isnan(out_1)] = 0 max_diff = np.amax(np.abs(out_1 - out_2)) self.assertLessEqual(max_diff, 1e-5) @require_tf class TFBertEncoderDecoderModelTest(TFEncoderDecoderMixin, unittest.TestCase): def get_pretrained_model(self): return TFEncoderDecoderModel.from_encoder_decoder_pretrained("bert-base-uncased", "bert-base-uncased") def get_encoder_decoder_model(self, config, decoder_config): encoder_model = TFBertModel(config, name="encoder") decoder_model = TFBertLMHeadModel(decoder_config, name="decoder") return encoder_model, decoder_model def prepare_config_and_inputs(self): model_tester_encoder = TFBertModelTester(self, batch_size=13) model_tester_decoder = TFBertModelTester(self, batch_size=13) encoder_config_and_inputs = model_tester_encoder.prepare_config_and_inputs() decoder_config_and_inputs = model_tester_decoder.prepare_config_and_inputs_for_decoder() ( config, input_ids, token_type_ids, attention_mask, sequence_labels, token_labels, choice_labels, ) = encoder_config_and_inputs ( decoder_config, decoder_input_ids, decoder_token_type_ids, decoder_attention_mask, decoder_sequence_labels, decoder_token_labels, decoder_choice_labels, encoder_hidden_states, encoder_attention_mask, ) = decoder_config_and_inputs # make sure that cross attention layers are added decoder_config.add_cross_attention = True # disable cache for now decoder_config.use_cache = False return { "config": config, "input_ids": input_ids, "attention_mask": attention_mask, "decoder_config": decoder_config, "decoder_input_ids": decoder_input_ids, "decoder_token_type_ids": decoder_token_type_ids, "decoder_attention_mask": decoder_attention_mask, "decoder_sequence_labels": decoder_sequence_labels, "decoder_token_labels": decoder_token_labels, "decoder_choice_labels": decoder_choice_labels, "encoder_hidden_states": encoder_hidden_states, "labels": decoder_token_labels, } @slow @is_pt_tf_cross_test def test_bert2bert_summarization(self): from transformers import EncoderDecoderModel tokenizer = AutoTokenizer.from_pretrained("bert-base-uncased") """Not working, because pt checkpoint has `encoder.encoder.layer...` while tf model has `encoder.bert.encoder.layer...` (For Bert decoder, there is no issue, because `BertModel` is wrapped into `decoder` as `bert`) model = TFEncoderDecoderModel.from_pretrained("patrickvonplaten/bert2bert-cnn_dailymail-fp16", from_pt=True) """ # workaround to load from pt _model = EncoderDecoderModel.from_pretrained("patrickvonplaten/bert2bert-cnn_dailymail-fp16") _model.encoder.save_pretrained("./encoder") _model.decoder.save_pretrained("./decoder") model = TFEncoderDecoderModel.from_encoder_decoder_pretrained( "./encoder", "./decoder", encoder_from_pt=True, decoder_from_pt=True ) model.config = _model.config ARTICLE_STUDENTS = """(CNN)Sigma Alpha Epsilon is under fire for a video showing party-bound fraternity members singing a racist chant. SAE's national chapter suspended the students, but University of Oklahoma President David Boren took it a step further, saying the university's affiliation with the fraternity is permanently done. The news is shocking, but it's not the first time SAE has faced controversy. SAE was founded March 9, 1856, at the University of Alabama, five years before the American Civil War, according to the fraternity website. When the war began, the group had fewer than 400 members, of which "369 went to war for the Confederate States and seven for the Union Army," the website says. The fraternity now boasts more than 200,000 living alumni, along with about 15,000 undergraduates populating 219 chapters and 20 "colonies" seeking full membership at universities. SAE has had to work hard to change recently after a string of member deaths, many blamed on the hazing of new recruits, SAE national President Bradley Cohen wrote in a message on the fraternity's website. The fraternity's website lists more than 130 chapters cited or suspended for "health and safety incidents" since 2010. At least 30 of the incidents involved hazing, and dozens more involved alcohol. However, the list is missing numerous incidents from recent months. Among them, according to various media outlets: Yale University banned the SAEs from campus activities last month after members allegedly tried to interfere with a sexual misconduct investigation connected to an initiation rite. Stanford University in December suspended SAE housing privileges after finding sorority members attending a fraternity function were subjected to graphic sexual content. And Johns Hopkins University in November suspended the fraternity for underage drinking. "The media has labeled us as the 'nation's deadliest fraternity,' " Cohen said. In 2011, for example, a student died while being coerced into excessive alcohol consumption, according to a lawsuit. SAE's previous insurer dumped the fraternity. "As a result, we are paying Lloyd's of London the highest insurance rates in the Greek-letter world," Cohen said. Universities have turned down SAE's attempts to open new chapters, and the fraternity had to close 12 in 18 months over hazing incidents.""" EXPECTED_SUMMARY_STUDENTS = """sae was founded in 1856, five years before the civil war. the fraternity has had to work hard to change recently. the university of oklahoma president says the university's affiliation with the fraternity is permanently done. the sae has had a string of members in recent months.""" input_dict = tokenizer(ARTICLE_STUDENTS, return_tensors="tf") output_ids = model.generate(input_ids=input_dict["input_ids"], max_length=None).numpy().tolist() summary = tokenizer.batch_decode(output_ids, skip_special_tokens=True) self.assertEqual(summary, [EXPECTED_SUMMARY_STUDENTS]) @require_tf class TFRoBertaEncoderDecoderModelTest(TFEncoderDecoderMixin, unittest.TestCase): def get_pretrained_model(self): return TFEncoderDecoderModel.from_encoder_decoder_pretrained("roberta-base", "roberta-base") def get_encoder_decoder_model(self, config, decoder_config): encoder_model = TFRobertaModel(config, name="encoder") decoder_model = TFRobertaForCausalLM(decoder_config, name="decoder") return encoder_model, decoder_model def prepare_config_and_inputs(self): model_tester_encoder = TFRobertaModelTester(self) model_tester_decoder = TFRobertaModelTester(self) encoder_config_and_inputs = model_tester_encoder.prepare_config_and_inputs() decoder_config_and_inputs = model_tester_decoder.prepare_config_and_inputs_for_decoder() ( config, input_ids, token_type_ids, input_mask, sequence_labels, token_labels, choice_labels, ) = encoder_config_and_inputs ( decoder_config, decoder_input_ids, decoder_token_type_ids, decoder_input_mask, decoder_sequence_labels, decoder_token_labels, decoder_choice_labels, encoder_hidden_states, encoder_attention_mask, ) = decoder_config_and_inputs # make sure that cross attention layers are added decoder_config.add_cross_attention = True # disable cache for now decoder_config.use_cache = False return { "config": config, "input_ids": input_ids, "attention_mask": input_mask, "decoder_config": decoder_config, "decoder_input_ids": decoder_input_ids, "decoder_token_type_ids": decoder_token_type_ids, "decoder_attention_mask": decoder_input_mask, "decoder_sequence_labels": decoder_sequence_labels, "decoder_token_labels": decoder_token_labels, "decoder_choice_labels": decoder_choice_labels, "encoder_hidden_states": encoder_hidden_states, "labels": decoder_token_labels, } @require_tf class TFRembertEncoderDecoderModelTest(TFEncoderDecoderMixin, unittest.TestCase): def get_pretrained_model(self): return TFEncoderDecoderModel.from_encoder_decoder_pretrained("google/rembert", "google/rembert") def get_encoder_decoder_model(self, config, decoder_config): encoder_model = TFRemBertModel(config, name="encoder") decoder_model = TFRemBertForCausalLM(decoder_config, name="decoder") return encoder_model, decoder_model def prepare_config_and_inputs(self): model_tester_encoder = TFRemBertModelTester(self) model_tester_decoder = TFRemBertModelTester(self) encoder_config_and_inputs = model_tester_encoder.prepare_config_and_inputs() decoder_config_and_inputs = model_tester_decoder.prepare_config_and_inputs_for_decoder() ( config, input_ids, token_type_ids, input_mask, sequence_labels, token_labels, choice_labels, ) = encoder_config_and_inputs ( decoder_config, decoder_input_ids, decoder_token_type_ids, decoder_input_mask, decoder_sequence_labels, decoder_token_labels, decoder_choice_labels, encoder_hidden_states, encoder_attention_mask, ) = decoder_config_and_inputs # make sure that cross attention layers are added decoder_config.add_cross_attention = True # disable cache for now decoder_config.use_cache = False return { "config": config, "input_ids": input_ids, "attention_mask": input_mask, "decoder_config": decoder_config, "decoder_input_ids": decoder_input_ids, "decoder_token_type_ids": decoder_token_type_ids, "decoder_attention_mask": decoder_input_mask, "decoder_sequence_labels": decoder_sequence_labels, "decoder_token_labels": decoder_token_labels, "decoder_choice_labels": decoder_choice_labels, "encoder_hidden_states": encoder_hidden_states, "labels": decoder_token_labels, } @require_tf class TFEncoderDecoderModelTest(unittest.TestCase): def get_from_encoderdecoder_pretrained_model(self): return TFEncoderDecoderModel.from_encoder_decoder_pretrained("bert-base-cased", "bert-base-cased") def get_decoder_config(self): config = AutoConfig.from_pretrained("bert-base-cased") config.is_decoder = True config.add_cross_attention = True return config def get_encoderdecoder_model(self): return TFEncoderDecoderModel.from_pretrained("patrickvonplaten/bert2bert-cnn_dailymail-fp16") def get_encoder_decoder_models(self): encoder_model = TFBertModel.from_pretrained("bert-base-cased", name="encoder") decoder_model = TFBertLMHeadModel.from_pretrained( "bert-base-cased", config=self.get_decoder_config(), name="decoder" ) return {"encoder": encoder_model, "decoder": decoder_model} def _check_configuration_tie(self, model): assert id(model.decoder.config) == id(model.config.decoder) assert id(model.encoder.config) == id(model.config.encoder) @slow def test_configuration_tie(self): model = self.get_from_encoderdecoder_pretrained_model() self._check_configuration_tie(model) model = TFEncoderDecoderModel(**self.get_encoder_decoder_models()) self._check_configuration_tie(model) # # This should be enabled once we upload the TF version of # # "patrickvonplaten/bert2bert-cnn_dailymail-fp16" to the Hub. # model = self.get_encoderdecoder_model() # self._check_configuration_tie(model) @require_tf class TFEncoderDecoderModelSaveLoadTests(unittest.TestCase): def get_encoder_decoder_config(self): encoder_config = AutoConfig.from_pretrained("bert-base-uncased") decoder_config = AutoConfig.from_pretrained("bert-base-uncased", is_decoder=True, add_cross_attention=True) return EncoderDecoderConfig.from_encoder_decoder_configs(encoder_config, decoder_config) def get_encoder_decoder_config_small(self): encoder_config = AutoConfig.from_pretrained("hf-internal-testing/tiny-bert") decoder_config = AutoConfig.from_pretrained( "hf-internal-testing/tiny-bert", is_decoder=True, add_cross_attention=True ) return EncoderDecoderConfig.from_encoder_decoder_configs(encoder_config, decoder_config) def test_encoder_decoder_save_load_from_encoder_decoder(self): config = self.get_encoder_decoder_config_small() # create two random BERT models for bert2bert & initialize weights (+cross_attention weights) encoder = TFBertModel(config.encoder) encoder(encoder.dummy_inputs) decoder = TFBertLMHeadModel(config.decoder) decoder(decoder.dummy_inputs) encoder_decoder_orig = TFEncoderDecoderModel(encoder=encoder, decoder=decoder) input_ids = ids_tensor([13, 5], encoder.config.vocab_size) decoder_input_ids = ids_tensor([13, 1], decoder.config.vocab_size) logits_orig = encoder_decoder_orig(input_ids=input_ids, decoder_input_ids=decoder_input_ids).logits with tempfile.TemporaryDirectory() as tmp_dirname: encoder_path = os.path.join(tmp_dirname, "encoder") decoder_path = os.path.join(tmp_dirname, "decoder") encoder.save_pretrained(encoder_path) decoder.save_pretrained(decoder_path) encoder_decoder = TFEncoderDecoderModel.from_encoder_decoder_pretrained(encoder_path, decoder_path) logits_1 = encoder_decoder(input_ids=input_ids, decoder_input_ids=decoder_input_ids).logits self.assertTrue(logits_orig.numpy().sum() - logits_1.numpy().sum() < 1e-3) max_diff = np.max(np.abs(logits_1.numpy() - logits_orig.numpy())) self.assertAlmostEqual(max_diff, 0.0, places=4) with tempfile.TemporaryDirectory() as tmp_dirname: encoder_decoder.save_pretrained(tmp_dirname) encoder_decoder = TFEncoderDecoderModel.from_pretrained(tmp_dirname) logits_2 = encoder_decoder(input_ids=input_ids, decoder_input_ids=decoder_input_ids).logits max_diff = np.max(np.abs(logits_2.numpy() - logits_orig.numpy())) self.assertAlmostEqual(max_diff, 0.0, places=4) @require_torch @is_pt_tf_cross_test def test_encoder_decoder_save_load_from_encoder_decoder_from_pt(self): config = self.get_encoder_decoder_config_small() # create two random BERT models for bert2bert & initialize weights (+cross_attention weights) encoder_pt = BertModel(config.encoder).to(torch_device).eval() decoder_pt = BertLMHeadModel(config.decoder).to(torch_device).eval() encoder_decoder_pt = EncoderDecoderModel(encoder=encoder_pt, decoder=decoder_pt).to(torch_device).eval() input_ids = ids_tensor([13, 5], encoder_pt.config.vocab_size) decoder_input_ids = ids_tensor([13, 1], decoder_pt.config.vocab_size) pt_input_ids = torch.tensor(input_ids.numpy(), device=torch_device, dtype=torch.long) pt_decoder_input_ids = torch.tensor(decoder_input_ids.numpy(), device=torch_device, dtype=torch.long) logits_pt = encoder_decoder_pt(input_ids=pt_input_ids, decoder_input_ids=pt_decoder_input_ids).logits # PyTorch => TensorFlow with tempfile.TemporaryDirectory() as tmp_dirname_1, tempfile.TemporaryDirectory() as tmp_dirname_2: encoder_decoder_pt.encoder.save_pretrained(tmp_dirname_1) encoder_decoder_pt.decoder.save_pretrained(tmp_dirname_2) encoder_decoder_tf = TFEncoderDecoderModel.from_encoder_decoder_pretrained( tmp_dirname_1, tmp_dirname_2, encoder_from_pt=True, decoder_from_pt=True ) logits_tf = encoder_decoder_tf(input_ids=input_ids, decoder_input_ids=decoder_input_ids).logits max_diff = np.max(np.abs(logits_pt.detach().cpu().numpy() - logits_tf.numpy())) self.assertAlmostEqual(max_diff, 0.0, places=3) # TensorFlow => PyTorch with tempfile.TemporaryDirectory() as tmp_dirname: encoder_decoder_tf.save_pretrained(tmp_dirname) encoder_decoder_pt = EncoderDecoderModel.from_pretrained(tmp_dirname, from_tf=True) max_diff = np.max(np.abs(logits_pt.detach().cpu().numpy() - logits_tf.numpy())) self.assertAlmostEqual(max_diff, 0.0, places=3) @slow def test_encoder_decoder_from_pretrained(self): load_weight_prefix = "tf_encoder_decoder_model_1" config = self.get_encoder_decoder_config() encoder_tokenizer = AutoTokenizer.from_pretrained("bert-base-uncased") decoder_tokenizer = AutoTokenizer.from_pretrained("bert-base-uncased") input_ids = encoder_tokenizer("who sings does he love me with reba", return_tensors="tf").input_ids decoder_input_ids = decoder_tokenizer("Linda Davis", return_tensors="tf").input_ids with tempfile.TemporaryDirectory() as tmp_dirname: # Since most of HF's models don't have pretrained cross-attention layers, they are randomly # initialized even if we create models using `from_pretrained` method. # For the tests, the decoder need to be a model with pretrained cross-attention layers. # So we create pretrained models (without `load_weight_prefix`), save them, and later, # we load them using `from_pretrained`. # (we don't need to do this for encoder, but let's make the code more similar between encoder/decoder) encoder = TFAutoModel.from_pretrained("bert-base-uncased", name="encoder") # It's necessary to specify `add_cross_attention=True` here. decoder = TFAutoModelForCausalLM.from_pretrained( "bert-base-uncased", is_decoder=True, add_cross_attention=True, name="decoder" ) pretrained_encoder_dir = os.path.join(tmp_dirname, "pretrained_encoder") pretrained_decoder_dir = os.path.join(tmp_dirname, "pretrained_decoder") encoder.save_pretrained(pretrained_encoder_dir) decoder.save_pretrained(pretrained_decoder_dir) del encoder del decoder enc_dec_model = TFEncoderDecoderModel.from_encoder_decoder_pretrained( pretrained_encoder_dir, pretrained_decoder_dir, ) # check that the from pretrained methods work enc_dec_model.save_pretrained(tmp_dirname) enc_dec_model = TFEncoderDecoderModel.from_pretrained(tmp_dirname) output = enc_dec_model(input_ids, decoder_input_ids=decoder_input_ids, labels=decoder_input_ids) loss_pretrained = output.loss del enc_dec_model # Create the model using `__init__` with loaded ``pretrained`` encoder / decoder encoder = TFAutoModel.from_pretrained( pretrained_encoder_dir, load_weight_prefix=load_weight_prefix, name="encoder" ) decoder = TFAutoModelForCausalLM.from_pretrained( pretrained_decoder_dir, load_weight_prefix=load_weight_prefix, name="decoder" ) enc_dec_model = TFEncoderDecoderModel(config=config, encoder=encoder, decoder=decoder) output = enc_dec_model(input_ids, decoder_input_ids=decoder_input_ids, labels=decoder_input_ids) loss_init = output.loss max_diff = np.max(np.abs(loss_pretrained - loss_init)) expected_diff = 0.0 self.assertAlmostEqual(max_diff, expected_diff, places=4)