# 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. from __future__ import annotations import copy 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 transformers.utils.generic import ModelOutput from ...test_modeling_tf_common import ids_tensor from ..bert.test_modeling_tf_bert import TFBertModelTester from ..gpt2.test_modeling_tf_gpt2 import TFGPT2ModelTester from ..rembert.test_modeling_tf_rembert import TFRemBertModelTester from ..roberta.test_modeling_tf_roberta import TFRobertaModelTester if is_tf_available(): import tensorflow as tf from transformers import ( AutoConfig, AutoTokenizer, EncoderDecoderConfig, TFAutoModel, TFAutoModelForCausalLM, TFBertLMHeadModel, TFBertModel, TFEncoderDecoderModel, TFGPT2LMHeadModel, 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, kwargs=kwargs, ) 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, kwargs=kwargs, ) 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, kwargs=kwargs, ) 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, kwargs=kwargs, ) 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, kwargs=kwargs, ) 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, kwargs=kwargs, ) 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, kwargs=kwargs, ) # Make sure `loss` exist self.assertIn("loss", outputs_encoder_decoder) batch_size, seq_len = decoder_input_ids.shape expected_shape = (batch_size, seq_len, 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_output_with_attentions( self, outputs_encoder_decoder, config, input_ids, decoder_config, decoder_input_ids ): 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_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, kwargs=kwargs, ) self._check_output_with_attentions( outputs_encoder_decoder, config, input_ids, decoder_config, decoder_input_ids ) def check_encoder_decoder_model_output_attentions_from_config( self, config, input_ids, attention_mask, encoder_hidden_states, decoder_config, decoder_input_ids, decoder_attention_mask, **kwargs, ): # Similar to `check_encoder_decoder_model_output_attentions`, but with `output_attentions` triggered from the # config file. Contrarily to most models, changing the model's config won't work -- the defaults are loaded # from the inner models' configurations. 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) enc_dec_model.config.output_attentions = True # model config -> won't work 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, kwargs=kwargs, ) self.assertTrue( all( key not in outputs_encoder_decoder for key in ["encoder_attentions", "decoder_attentions", "cross_attentions"] ) ) config.output_attentions = True # inner model config -> will work decoder_config.output_attentions = True 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, kwargs=kwargs, ) self._check_output_with_attentions( outputs_encoder_decoder, config, input_ids, decoder_config, decoder_input_ids ) 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) # Generate until max length if hasattr(enc_dec_model.config, "eos_token_id"): enc_dec_model.config.eos_token_id = None if hasattr(enc_dec_model.config, "decoder") and hasattr(enc_dec_model.config.decoder, "eos_token_id"): enc_dec_model.config.decoder.eos_token_id = None # 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 check_pt_tf_outputs(self, tf_outputs, pt_outputs, model_class, tol=1e-5, name="outputs", attributes=None): """Check the outputs from PyTorch and TensorFlow models are close enough. Checks are done in a recursive way. Args: model_class: The class of the model that is currently testing. For example, `TFBertModel`, TFBertForMaskedLM`, `TFBertForSequenceClassification`, etc. Mainly used for providing more informative error messages. name (`str`): The name of the output. For example, `output.hidden_states`, `output.attentions`, etc. attributes (`Tuple[str]`): The names of the output's element if the output is a tuple/list with each element being a named field in the output. """ self.assertEqual(type(name), str) if attributes is not None: self.assertEqual(type(attributes), tuple, f"{name}: The argument `attributes` should be a `tuple`") # Allow `ModelOutput` (e.g. `CLIPOutput` has `text_model_output` and `vision_model_output`). if isinstance(tf_outputs, ModelOutput): self.assertTrue( isinstance(pt_outputs, ModelOutput), f"{name}: `pt_outputs` should an instance of `ModelOutput` when `tf_outputs` is", ) tf_keys = [k for k, v in tf_outputs.items() if v is not None] pt_keys = [k for k, v in pt_outputs.items() if v is not None] self.assertEqual(tf_keys, pt_keys, f"{name}: Output keys differ between TF and PyTorch") # convert to the case of `tuple` # appending each key to the current (string) `names` attributes = tuple([f"{name}.{k}" for k in tf_keys]) self.check_pt_tf_outputs( tf_outputs.to_tuple(), pt_outputs.to_tuple(), model_class, tol=tol, name=name, attributes=attributes ) # Allow `list` (e.g. `TransfoXLModelOutput.mems` is a list of tensors.) elif type(tf_outputs) in [tuple, list]: self.assertEqual(type(tf_outputs), type(pt_outputs), f"{name}: Output types differ between TF and PyTorch") self.assertEqual(len(tf_outputs), len(pt_outputs), f"{name}: Output lengths differ between TF and PyTorch") if attributes is not None: # case 1: each output has assigned name (e.g. a tuple form of a `ModelOutput`) self.assertEqual( len(attributes), len(tf_outputs), f"{name}: The tuple `names` should have the same length as `tf_outputs`", ) else: # case 2: each output has no assigned name (e.g. hidden states of each layer) -> add an index to `names` attributes = tuple([f"{name}_{idx}" for idx in range(len(tf_outputs))]) for tf_output, pt_output, attr in zip(tf_outputs, pt_outputs, attributes): self.check_pt_tf_outputs(tf_output, pt_output, model_class, tol=tol, name=attr) elif isinstance(tf_outputs, tf.Tensor): self.assertTrue( isinstance(pt_outputs, torch.Tensor), f"{name}: `pt_outputs` should a tensor when `tf_outputs` is" ) tf_outputs = tf_outputs.numpy() pt_outputs = pt_outputs.detach().to("cpu").numpy() self.assertEqual( tf_outputs.shape, pt_outputs.shape, f"{name}: Output shapes differ between TF and PyTorch" ) # deal with NumPy's scalars to make replacing nan values by 0 work. if np.isscalar(tf_outputs): tf_outputs = np.array([tf_outputs]) pt_outputs = np.array([pt_outputs]) tf_nans = np.isnan(tf_outputs) pt_nans = np.isnan(pt_outputs) pt_outputs[tf_nans] = 0 tf_outputs[tf_nans] = 0 pt_outputs[pt_nans] = 0 tf_outputs[pt_nans] = 0 max_diff = np.amax(np.abs(tf_outputs - pt_outputs)) self.assertLessEqual(max_diff, tol, f"{name}: Difference between torch and tf is {max_diff} (>= {tol}).") else: raise ValueError( "`tf_outputs` should be an instance of `tf.Tensor`, a `tuple`, or an instance of `tf.Tensor`. Got" f" {type(tf_outputs)} instead." ) def prepare_pt_inputs_from_tf_inputs(self, tf_inputs_dict): pt_inputs_dict = {} for name, key in tf_inputs_dict.items(): if type(key) == bool: pt_inputs_dict[name] = key elif name == "input_values": pt_inputs_dict[name] = torch.from_numpy(key.numpy()).to(torch.float32) elif name == "pixel_values": pt_inputs_dict[name] = torch.from_numpy(key.numpy()).to(torch.float32) elif name == "input_features": pt_inputs_dict[name] = torch.from_numpy(key.numpy()).to(torch.float32) # other general float inputs elif tf_inputs_dict[name].dtype.is_floating: pt_inputs_dict[name] = torch.from_numpy(key.numpy()).to(torch.float32) else: pt_inputs_dict[name] = torch.from_numpy(key.numpy()).to(torch.long) return pt_inputs_dict def check_pt_tf_models(self, tf_model, pt_model, tf_inputs_dict): pt_inputs_dict = self.prepare_pt_inputs_from_tf_inputs(tf_inputs_dict) # send pytorch inputs to the correct device pt_inputs_dict = { k: v.to(device=torch_device) if isinstance(v, torch.Tensor) else v for k, v in pt_inputs_dict.items() } # send pytorch model to the correct device pt_model.to(torch_device) # Check predictions on first output (logits/hidden-states) are close enough given low-level computational differences pt_model.eval() with torch.no_grad(): pt_outputs = pt_model(**pt_inputs_dict) tf_outputs = tf_model(tf_inputs_dict) # tf models returned loss is usually a tensor rather than a scalar. # (see `hf_compute_loss`: it uses `tf.keras.losses.Reduction.NONE`) # Change it here to a scalar to match PyTorch models' loss tf_loss = getattr(tf_outputs, "loss", None) if tf_loss is not None: tf_outputs.loss = tf.math.reduce_mean(tf_loss) self.check_pt_tf_outputs(tf_outputs, pt_outputs, type(tf_model)) def check_pt_tf_equivalence(self, tf_model, pt_model, tf_inputs_dict): """Wrap `check_pt_tf_models` to further check PT -> TF again""" self.check_pt_tf_models(tf_model, pt_model, tf_inputs_dict) # PT -> TF with tempfile.TemporaryDirectory() as tmpdirname: pt_model.save_pretrained(tmpdirname) tf_model = TFEncoderDecoderModel.from_pretrained(tmpdirname, from_pt=True) self.check_pt_tf_models(tf_model, pt_model, tf_inputs_dict) def check_pt_to_tf_equivalence(self, config, decoder_config, tf_inputs_dict): """EncoderDecoderModel requires special way to cross load (PT -> TF)""" encoder_decoder_config = EncoderDecoderConfig.from_encoder_decoder_configs(config, decoder_config) # Output all for aggressive testing encoder_decoder_config.output_hidden_states = True # All models tested in this file have attentions encoder_decoder_config.output_attentions = True pt_model = EncoderDecoderModel(encoder_decoder_config) with tempfile.TemporaryDirectory() as tmpdirname: pt_model.save_pretrained(tmpdirname) tf_model = TFEncoderDecoderModel.from_pretrained(tmpdirname, from_pt=True) self.check_pt_tf_equivalence(tf_model, pt_model, tf_inputs_dict) def check_tf_to_pt_equivalence(self, config, decoder_config, tf_inputs_dict): """EncoderDecoderModel requires special way to cross load (TF -> PT)""" encoder_decoder_config = EncoderDecoderConfig.from_encoder_decoder_configs(config, decoder_config) # Output all for aggressive testing encoder_decoder_config.output_hidden_states = True # TODO: A generalizable way to determine this attribute encoder_decoder_config.output_attentions = True tf_model = TFEncoderDecoderModel(encoder_decoder_config) # Make sure model is built before saving tf_model(**tf_inputs_dict) with tempfile.TemporaryDirectory() as tmpdirname: tf_model.save_pretrained(tmpdirname) pt_model = EncoderDecoderModel.from_pretrained(tmpdirname, from_tf=True) self.check_pt_tf_equivalence(tf_model, pt_model, tf_inputs_dict) 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_output_attentions_from_config(self): input_ids_dict = self.prepare_config_and_inputs() self.check_encoder_decoder_model_output_attentions_from_config(**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) def assert_almost_equals(self, a: np.ndarray, b: np.ndarray, tol: float): diff = np.abs((a - b)).max() self.assertLessEqual(diff, tol, f"Difference between torch and tf is {diff} (>= {tol}).") @is_pt_tf_cross_test def test_pt_tf_model_equivalence(self): config_inputs_dict = self.prepare_config_and_inputs() labels = config_inputs_dict.pop("decoder_token_labels") # Keep only common arguments arg_names = [ "config", "input_ids", "attention_mask", "decoder_config", "decoder_input_ids", "decoder_attention_mask", "encoder_hidden_states", ] config_inputs_dict = {k: v for k, v in config_inputs_dict.items() if k in arg_names} config = config_inputs_dict.pop("config") decoder_config = config_inputs_dict.pop("decoder_config") # Output all for aggressive testing config.output_hidden_states = True decoder_config.output_hidden_states = True # All models tested in this file have attentions config.output_attentions = True decoder_config.output_attentions = True tf_inputs_dict = config_inputs_dict # `encoder_hidden_states` is not used in model call/forward del tf_inputs_dict["encoder_hidden_states"] # Make sure no sequence has all zeros as attention mask, otherwise some tests fail due to the inconsistency # of the usage `1e-4`, `1e-9`, `1e-30`, `-inf`. for k in ["attention_mask", "decoder_attention_mask"]: attention_mask = tf_inputs_dict[k] # Make sure no all 0s attention masks - to avoid failure at this moment. # Put `1` at the beginning of sequences to make it still work when combining causal attention masks. # TODO: remove this line once a fix regarding large negative values for attention mask is done. attention_mask = tf.concat( [tf.ones_like(attention_mask[:, :1], dtype=attention_mask.dtype), attention_mask[:, 1:]], axis=-1 ) tf_inputs_dict[k] = attention_mask tf_inputs_dict_with_labels = copy.copy(tf_inputs_dict) tf_inputs_dict_with_labels["labels"] = labels self.assertTrue(decoder_config.cross_attention_hidden_size is None) # Original test: check without `labels` and without `enc_to_dec_proj` projection self.assertTrue(config.hidden_size == decoder_config.hidden_size) self.check_pt_to_tf_equivalence(config, decoder_config, tf_inputs_dict) self.check_tf_to_pt_equivalence(config, decoder_config, tf_inputs_dict) # check with `labels` self.check_pt_to_tf_equivalence(config, decoder_config, tf_inputs_dict_with_labels) self.check_tf_to_pt_equivalence(config, decoder_config, tf_inputs_dict_with_labels) # check `enc_to_dec_proj` work as expected decoder_config.hidden_size = decoder_config.hidden_size * 2 self.assertTrue(config.hidden_size != decoder_config.hidden_size) self.check_pt_to_tf_equivalence(config, decoder_config, tf_inputs_dict) self.check_tf_to_pt_equivalence(config, decoder_config, tf_inputs_dict) def test_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.decoder.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 setUp(self): self.encoder_model_tester = TFBertModelTester(self, batch_size=13) self.decoder_model_tester = TFBertModelTester(self, batch_size=13) def get_pretrained_model(self): return TFEncoderDecoderModel.from_encoder_decoder_pretrained( "hf-internal-testing/tiny-random-bert", "hf-internal-testing/tiny-random-bert", ) 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): encoder_config_and_inputs = self.encoder_model_tester.prepare_config_and_inputs() decoder_config_and_inputs = self.decoder_model_tester.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"]).numpy().tolist() summary = tokenizer.batch_decode(output_ids, skip_special_tokens=True) self.assertEqual(summary, [EXPECTED_SUMMARY_STUDENTS]) # Test with the TF checkpoint model = TFEncoderDecoderModel.from_pretrained("ydshieh/bert2bert-cnn_dailymail-fp16") output_ids = model.generate(input_ids=input_dict["input_ids"]).numpy().tolist() summary = tokenizer.batch_decode(output_ids, skip_special_tokens=True) self.assertEqual(summary, [EXPECTED_SUMMARY_STUDENTS]) @require_tf class TFGPT2EncoderDecoderModelTest(TFEncoderDecoderMixin, unittest.TestCase): def setUp(self): self.encoder_model_tester = TFBertModelTester(self, batch_size=13) self.decoder_model_tester = TFGPT2ModelTester(self) def get_pretrained_model(self): return TFEncoderDecoderModel.from_encoder_decoder_pretrained( "hf-internal-testing/tiny-random-bert", "hf-internal-testing/tiny-random-gpt2", ) def get_encoder_decoder_model(self, config, decoder_config): encoder_model = TFBertModel(config, name="encoder") decoder_model = TFGPT2LMHeadModel(decoder_config, name="decoder") return encoder_model, decoder_model def prepare_config_and_inputs(self): encoder_config_and_inputs = self.encoder_model_tester.prepare_config_and_inputs() decoder_config_and_inputs = self.decoder_model_tester.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_attention_mask, decoder_head_mask, decoder_token_type_ids, 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_bert2gpt2_summarization(self): from transformers import EncoderDecoderModel tokenizer_in = AutoTokenizer.from_pretrained("bert-base-cased") tokenizer_out = AutoTokenizer.from_pretrained("gpt2") """Not working, because pt checkpoint has `encoder.encoder.layer...` while tf model has `encoder.bert.encoder.layer...`. (For GPT2 decoder, there is no issue) model = TFEncoderDecoderModel.from_pretrained("patrickvonplaten/bert2gpt2-cnn_dailymail-fp16", from_pt=True) """ # workaround to load from pt _model = EncoderDecoderModel.from_pretrained("patrickvonplaten/bert2gpt2-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 = """SAS Alpha Epsilon suspended the students, but university president says it's permanent.\nThe fraternity has had to deal with a string of student deaths since 2010.\nSAS has more than 200,000 members, many of whom are students.\nA student died while being forced into excessive alcohol consumption.""" input_dict = tokenizer_in(ARTICLE_STUDENTS, return_tensors="tf") output_ids = model.generate(input_ids=input_dict["input_ids"]).numpy().tolist() summary = tokenizer_out.batch_decode(output_ids, skip_special_tokens=True) self.assertEqual(summary, [EXPECTED_SUMMARY_STUDENTS]) @require_tf class TFRoBertaEncoderDecoderModelTest(TFEncoderDecoderMixin, unittest.TestCase): def setUp(self): self.encoder_model_tester = TFRobertaModelTester(self) self.decoder_model_tester = TFRobertaModelTester(self) def get_pretrained_model(self): return TFEncoderDecoderModel.from_encoder_decoder_pretrained( "hf-internal-testing/tiny-random-roberta", "hf-internal-testing/tiny-random-roberta", ) 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): encoder_config_and_inputs = self.encoder_model_tester.prepare_config_and_inputs() decoder_config_and_inputs = self.decoder_model_tester.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 setUp(self): self.encoder_model_tester = TFRemBertModelTester(self) self.decoder_model_tester = TFRemBertModelTester(self) def get_pretrained_model(self): return TFEncoderDecoderModel.from_encoder_decoder_pretrained( "hf-internal-testing/tiny-random-rembert", "hf-internal-testing/tiny-random-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): encoder_config_and_inputs = self.encoder_model_tester.prepare_config_and_inputs() decoder_config_and_inputs = self.decoder_model_tester.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.build() decoder = TFBertLMHeadModel(config.decoder) decoder.build() 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) # Make sure `from_pretrained` following `save_pretrained` work and give the same result with tempfile.TemporaryDirectory() as tmp_dirname: encoder_decoder_tf.save_pretrained(tmp_dirname) encoder_decoder_tf = TFEncoderDecoderModel.from_pretrained(tmp_dirname) logits_tf_2 = encoder_decoder_tf(input_ids=input_ids, decoder_input_ids=decoder_input_ids).logits max_diff = np.max(np.abs(logits_tf_2.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 = TFEncoderDecoderModel.load_weight_prefix 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)