add GPT2 to init - fix weights loading - remove tf.function

pytorch_transformers/__init__.py

@@ -99,13 +99,19 @@ if _tf_available:
     from .modeling_tf_auto import (TFAutoModel, TFAutoModelForSequenceClassification, TFAutoModelForQuestionAnswering,
                                    TFAutoModelWithLMHead)
 
-    from .modeling_tf_bert import (TFBertPreTrainedModel, TFBertModel, TFBertForPreTraining,
+    from .modeling_tf_bert import (TFBertPreTrainedModel, TFBertMainLayer, TFBertEmbeddings,
+                                   TFBertModel, TFBertForPreTraining,
                                    TFBertForMaskedLM, TFBertForNextSentencePrediction,
                                    TFBertForSequenceClassification, TFBertForMultipleChoice,
                                    TFBertForTokenClassification, TFBertForQuestionAnswering,
-                                   load_bert_pt_weights_in_tf,
+                                   load_bert_pt_weights_in_tf2,
                                    TF_BERT_PRETRAINED_MODEL_ARCHIVE_MAP)
 
+    from .modeling_tf_gpt2 import (TFGPT2PreTrainedModel, TFGPT2MainLayer, TFGPT2Embeddings,
+                                   TFGPT2Model, TFGPT2LMHeadModel, TFGPT2DoubleHeadsModel,
+                                   load_gpt2_pt_weights_in_tf2,
+                                   TF_GPT2_PRETRAINED_MODEL_ARCHIVE_MAP)
+
 
 # Files and general utilities
 from .file_utils import (PYTORCH_TRANSFORMERS_CACHE, PYTORCH_PRETRAINED_BERT_CACHE,

pytorch_transformers/convert_pytorch_checkpoint_to_tf2.py

@@ -21,22 +21,32 @@ from __future__ import print_function
 import argparse
 import tensorflow as tf
 
-from pytorch_transformers import BertConfig, TFBertForPreTraining, load_bert_pt_weights_in_tf
+import pytorch_transformers
+
+from pytorch_transformers import (BertConfig, TFBertForPreTraining, load_bert_pt_weights_in_tf2,
+                                  GPT2Config, TFGPT2LMHeadModel, load_gpt2_pt_weights_in_tf2)
 
 import logging
 logging.basicConfig(level=logging.INFO)
 
+MODEL_CLASSES = {
+    'bert': (BertConfig, TFBertForPreTraining, load_bert_pt_weights_in_tf2),
+    'gpt2': (GPT2Config, TFGPT2LMHeadModel, load_gpt2_pt_weights_in_tf2),
+}
+
 def convert_pt_checkpoint_to_tf(model_type, pytorch_checkpoint_path, config_file, tf_dump_path):
-    if model_type == 'bert':
-        # Initialise TF model
-        config = BertConfig.from_json_file(config_file)
-        print("Building TensorFlow model from configuration: {}".format(str(config)))
-        model = TFBertForPreTraining(config)
+    if model_type not in MODEL_CLASSES:
+        raise ValueError("Unrecognized model type, should be one of {}.".format(list(MODEL_CLASSES.keys())))
+
+    config_class, model_class, loading_fct = MODEL_CLASSES[model_type]
+
+    # Initialise TF model
+    config = config_class.from_json_file(config_file)
+    print("Building TensorFlow model from configuration: {}".format(str(config)))
+    model = model_class(config)
 
-        # Load weights from tf checkpoint
-        model = load_bert_pt_weights_in_tf(model, config, pytorch_checkpoint_path)
-    else:
-        raise ValueError("Unrecognized model type, should be one of ['bert'].")
+    # Load weights from tf checkpoint
+    model = loading_fct(model, config, pytorch_checkpoint_path)
 
     # Save pytorch-model
     print("Save TensorFlow model to {}".format(tf_dump_path))
@@ -50,7 +60,7 @@ if __name__ == "__main__":
                         default = None,
                         type = str,
                         required = True,
-                        help = "Model type selcted in the list of.")
+                        help = "Model type selcted in the list of {}.".format(list(MODEL_CLASSES.keys())))
     parser.add_argument("--pytorch_checkpoint_path",
                         default = None,
                         type = str,

pytorch_transformers/modeling_tf_bert.py

@@ -51,7 +51,7 @@ TF_BERT_PRETRAINED_MODEL_ARCHIVE_MAP = {
 }
 
 
-def load_bert_pt_weights_in_tf(tf_model, config, pytorch_checkpoint_path):
+def load_bert_pt_weights_in_tf2(tf_model, config, pytorch_checkpoint_path):
     """ Load pytorch checkpoints in a TF 2.0 model and save it using HDF5 format
         We use HDF5 to easily do transfer learning
         (see https://github.com/tensorflow/tensorflow/blob/ee16fcac960ae660e0e4496658a366e2f745e1f0/tensorflow/python/keras/engine/network.py#L1352-L1357).
@@ -164,7 +164,7 @@ class TFBertEmbeddings(tf.keras.layers.Layer):
                     mean=0., stddev=self.hidden_size**-0.5))
         super(TFBertEmbeddings, self).build(input_shape)
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, mode="embedding", training=False):
         """Get token embeddings of inputs.
         Args:
@@ -248,7 +248,7 @@ class TFBertSelfAttention(tf.keras.layers.Layer):
         x = tf.reshape(x, (batch_size, -1, self.num_attention_heads, self.attention_head_size))
         return tf.transpose(x, perm=[0, 2, 1, 3])
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         hidden_states, attention_mask, head_mask = inputs
 
@@ -297,7 +297,7 @@ class TFBertSelfOutput(tf.keras.layers.Layer):
         self.LayerNorm = tf.keras.layers.LayerNormalization(epsilon=config.layer_norm_eps, name='LayerNorm')
         self.dropout = tf.keras.layers.Dropout(config.hidden_dropout_prob)
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         hidden_states, input_tensor = inputs
 
@@ -317,7 +317,7 @@ class TFBertAttention(tf.keras.layers.Layer):
     def prune_heads(self, heads):
         raise NotImplementedError
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         input_tensor, attention_mask, head_mask = inputs
 
@@ -336,7 +336,7 @@ class TFBertIntermediate(tf.keras.layers.Layer):
         else:
             self.intermediate_act_fn = config.hidden_act
 
-    @tf.function
+    # @tf.function
     def call(self, hidden_states):
         hidden_states = self.dense(hidden_states)
         hidden_states = self.intermediate_act_fn(hidden_states)
@@ -350,7 +350,7 @@ class TFBertOutput(tf.keras.layers.Layer):
         self.LayerNorm = tf.keras.layers.LayerNormalization(epsilon=config.layer_norm_eps, name='LayerNorm')
         self.dropout = tf.keras.layers.Dropout(config.hidden_dropout_prob)
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         hidden_states, input_tensor = inputs
 
@@ -368,7 +368,7 @@ class TFBertLayer(tf.keras.layers.Layer):
         self.intermediate = TFBertIntermediate(config, name='intermediate')
         self.bert_output = TFBertOutput(config, name='output')
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         hidden_states, attention_mask, head_mask = inputs
 
@@ -387,7 +387,7 @@ class TFBertEncoder(tf.keras.layers.Layer):
         self.output_hidden_states = config.output_hidden_states
         self.layer = [TFBertLayer(config, name='layer_{}'.format(i)) for i in range(config.num_hidden_layers)]
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         hidden_states, attention_mask, head_mask = inputs
 
@@ -420,7 +420,7 @@ class TFBertPooler(tf.keras.layers.Layer):
         super(TFBertPooler, self).__init__(**kwargs)
         self.dense = tf.keras.layers.Dense(config.hidden_size, activation='tanh', name='dense')
 
-    @tf.function
+    # @tf.function
     def call(self, hidden_states):
         # We "pool" the model by simply taking the hidden state corresponding
         # to the first token.
@@ -439,7 +439,7 @@ class TFBertPredictionHeadTransform(tf.keras.layers.Layer):
             self.transform_act_fn = config.hidden_act
         self.LayerNorm = tf.keras.layers.LayerNormalization(epsilon=config.layer_norm_eps, name='LayerNorm')
 
-    @tf.function
+    # @tf.function
     def call(self, hidden_states):
         hidden_states = self.dense(hidden_states)
         hidden_states = self.transform_act_fn(hidden_states)
@@ -463,7 +463,7 @@ class TFBertLMPredictionHead(tf.keras.layers.Layer):
                                     trainable=True,
                                     name='bias')
 
-    @tf.function
+    # @tf.function
     def call(self, hidden_states):
         hidden_states = self.transform(hidden_states)
         hidden_states = self.decoder(hidden_states) + self.bias
@@ -475,7 +475,7 @@ class TFBertMLMHead(tf.keras.layers.Layer):
         super(TFBertMLMHead, self).__init__(**kwargs)
         self.predictions = TFBertLMPredictionHead(config, name='predictions')
 
-    @tf.function
+    # @tf.function
     def call(self, sequence_output):
         prediction_scores = self.predictions(sequence_output)
         return prediction_scores
@@ -486,7 +486,7 @@ class TFBertNSPHead(tf.keras.layers.Layer):
         super(TFBertNSPHead, self).__init__(**kwargs)
         self.seq_relationship = tf.keras.layers.Dense(2, name='seq_relationship')
 
-    @tf.function
+    # @tf.function
     def call(self, pooled_output):
         seq_relationship_score = self.seq_relationship(pooled_output)
         return seq_relationship_score
@@ -511,7 +511,7 @@ class TFBertMainLayer(tf.keras.layers.Layer):
         """
         raise NotImplementedError
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         if not isinstance(inputs, (dict, tuple, list)):
             input_ids = inputs
@@ -579,7 +579,7 @@ class TFBertPreTrainedModel(TFPreTrainedModel):
     """
     config_class = BertConfig
     pretrained_model_archive_map = TF_BERT_PRETRAINED_MODEL_ARCHIVE_MAP
-    load_pt_weights = load_bert_pt_weights_in_tf
+    load_pt_weights = load_bert_pt_weights_in_tf2
     base_model_prefix = "bert"
 
 
@@ -693,7 +693,7 @@ class TFBertModel(TFBertPreTrainedModel):
         super(TFBertModel, self).__init__(config, *inputs, **kwargs)
         self.bert = TFBertMainLayer(config, name='bert')
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         outputs = self.bert(inputs, training=training)
         return outputs
@@ -732,7 +732,7 @@ class TFBertForPreTraining(TFBertPreTrainedModel):
         self.bert = TFBertMainLayer(config, name='bert')
         self.cls_nsp = TFBertNSPHead(config, name='cls_nsp')
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         outputs = self.bert(inputs, training=training)
 
@@ -774,7 +774,7 @@ class TFBertForMaskedLM(TFBertPreTrainedModel):
 
         self.bert = TFBertMainLayer(config, name='bert')
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         outputs = self.bert(inputs, training=training)
 
@@ -818,7 +818,7 @@ class TFBertForNextSentencePrediction(TFBertPreTrainedModel):
         self.bert = TFBertMainLayer(config, name='bert')
         self.cls_nsp = TFBertNSPHead(config, name='cls_nsp')
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         outputs = self.bert(inputs, training=training)
 
@@ -863,7 +863,7 @@ class TFBertForSequenceClassification(TFBertPreTrainedModel):
         self.dropout = tf.keras.layers.Dropout(config.hidden_dropout_prob)
         self.classifier = tf.keras.layers.Dense(config.num_labels, name='classifier')
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         outputs = self.bert(inputs, training=training)
 
@@ -912,7 +912,7 @@ class TFBertForMultipleChoice(TFBertPreTrainedModel):
         self.dropout = tf.keras.layers.Dropout(config.hidden_dropout_prob)
         self.classifier = tf.keras.layers.Dense(1, name='classifier')
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         if not isinstance(inputs, (dict, tuple, list)):
             input_ids = inputs
@@ -989,7 +989,7 @@ class TFBertForTokenClassification(TFBertPreTrainedModel):
         self.dropout = tf.keras.layers.Dropout(config.hidden_dropout_prob)
         self.classifier = tf.keras.layers.Dense(config.num_labels, name='classifier')
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         outputs = self.bert(inputs, training=training)
 
@@ -1040,7 +1040,7 @@ class TFBertForQuestionAnswering(TFBertPreTrainedModel):
         self.bert = TFBertMainLayer(config, name='bert')
         self.qa_outputs = tf.keras.layers.Dense(config.num_labels, name='qa_outputs')
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         outputs = self.bert(inputs, training=training)
 

pytorch_transformers/modeling_tf_gpt2.py

@@ -39,7 +39,7 @@ TF_GPT2_PRETRAINED_MODEL_ARCHIVE_MAP = {"gpt2": "https://s3.amazonaws.com/models
                                      "gpt2-large": "https://s3.amazonaws.com/models.huggingface.co/bert/gpt2-large-tf_model.h5"}
 
 
-def load_gpt2_pt_weights_in_tf(tf_model, config, pytorch_checkpoint_path):
+def load_gpt2_pt_weights_in_tf2(tf_model, config, pytorch_checkpoint_path):
     """ Load pytorch checkpoints in a TF 2.0 model and save it using HDF5 format
         We use HDF5 to easily do transfer learning
         (see https://github.com/tensorflow/tensorflow/blob/ee16fcac960ae660e0e4496658a366e2f745e1f0/tensorflow/python/keras/engine/network.py#L1352-L1357).
@@ -67,24 +67,29 @@ def load_gpt2_pt_weights_in_tf(tf_model, config, pytorch_checkpoint_path):
     weight_value_tuples = []
     for symbolic_weight in symbolic_weights:
         name = symbolic_weight.name
-        name = name.replace('cls_mlm', 'cls')  # We had to split this layer in two in the TF model to be
-        name = name.replace('cls_nsp', 'cls')  # able to do transfer learning (Keras only allow to remove full layers)
         name = name.replace(':0', '')
-        name = name.replace('layer_', 'layer/')
+        name = name.replace('h_', 'h/')
         name = name.split('/')
-        name = name[1:]
+        name = name[2:]
 
         transpose = bool(name[-1] == 'kernel')
-        if name[-1] == 'kernel' or name[-1] == 'embeddings':
+        if name[-1] == 'kernel' or name[-1] == 'embeddings' or name[-1] == 'gamma':
             name[-1] = 'weight'
+        if name[-1] == 'beta':
+            name[-1] = 'bias'
 
         name = '.'.join(name)
-        assert name in state_dict
+        assert name in state_dict, "Weight {} not in PyTorch model".format(name)
         array = state_dict[name].numpy()
 
         if transpose:
             array = numpy.transpose(array)
 
+        if len(symbolic_weight.shape) > len(array.shape):
+            array = array[None, ...]
+        if len(symbolic_weight.shape) < len(array.shape):
+            array = np.squeeze(array)
+
         try:
             assert list(symbolic_weight.shape) == list(array.shape)
         except AssertionError as e:
@@ -138,7 +143,7 @@ class TFAttention(tf.keras.layers.Layer):
         pass
 
     @staticmethod
-    @tf.function
+    # @tf.function
     def causal_attention_mask(nd, ns, dtype):
         """1's in the lower triangle, counting from the lower right corner.
         Same as tf.matrix_band_part(tf.ones([nd, ns]), -1, ns-nd), but doesn't produce garbage on TPUs.
@@ -148,7 +153,7 @@ class TFAttention(tf.keras.layers.Layer):
         m = i >= j - ns + nd
         return tf.cast(m, dtype)
 
-    @tf.function
+    # @tf.function
     def _attn(self, inputs, training=False):
         q, k, v, attention_mask, head_mask = inputs
         # q, k, v have shape [batch, heads, sequence, features]
@@ -180,21 +185,21 @@ class TFAttention(tf.keras.layers.Layer):
             outputs.append(w)
         return outputs
 
-    @tf.function
+    # @tf.function
     def merge_heads(self, x):
         x = tf.transpose(x, [0, 2, 1, 3])
         x_shape = shape_list(x)
         new_x_shape = x_shape[:-2] + [x_shape[-2] * x_shape[-1]]
         return tf.reshape(x, new_x_shape)
 
-    @tf.function
+    # @tf.function
     def split_heads(self, x):
         x_shape = shape_list(x)
         new_x_shape = x_shape[:-1] + [self.n_head, x_shape[-1] // self.n_head]
         x = tf.reshape(x, new_x_shape)
         return tf.transpose(x, (0, 2, 1, 3))  # (batch, head, seq_length, head_features)
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         x, layer_past, attention_mask, head_mask = inputs
 
@@ -230,7 +235,7 @@ class TFMLP(tf.keras.layers.Layer):
         self.act = gelu
         self.dropout = tf.keras.layers.Dropout(config.resid_pdrop)
 
-    @tf.function
+    # @tf.function
     def call(self, x, training=False):
         h = self.act(self.c_fc(x))
         h2 = self.c_proj(h)
@@ -248,7 +253,7 @@ class TFBlock(tf.keras.layers.Layer):
         self.ln_2 = tf.keras.layers.LayerNormalization(epsilon=config.layer_norm_epsilon, name='ln_2')
         self.mlp = TFMLP(4 * nx, config, name='mlp')
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         x, layer_past, attention_mask, head_mask = inputs
 
@@ -284,7 +289,7 @@ class TFGPT2Embeddings(tf.keras.layers.Layer):
                 mean=0., stddev=self.hidden_size**-0.5))
         super(TFGPT2Embeddings, self).build(input_shape)
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, mode="embedding"):
         """Get token embeddings of inputs.
         Args:
@@ -349,7 +354,7 @@ class TFGPT2MainLayer(tf.keras.layers.Layer):
         """
         raise NotImplementedError
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         if not isinstance(inputs, (dict, tuple, list)):
             input_ids = inputs
@@ -465,7 +470,7 @@ class TFGPT2PreTrainedModel(TFPreTrainedModel):
     """
     config_class = GPT2Config
     pretrained_model_archive_map = TF_GPT2_PRETRAINED_MODEL_ARCHIVE_MAP
-    load_pt_weights = load_gpt2_pt_weights_in_tf
+    load_pt_weights = load_gpt2_pt_weights_in_tf2
     base_model_prefix = "transformer"
 
 
@@ -563,7 +568,7 @@ class TFGPT2Model(TFGPT2PreTrainedModel):
         super(TFGPT2Model, self).__init__(config, *inputs, **kwargs)
         self.transformer = TFGPT2MainLayer(config, name='transformer')
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         outputs = self.transformer(inputs, training=training)
         return outputs
@@ -605,7 +610,7 @@ class TFGPT2LMHeadModel(TFGPT2PreTrainedModel):
         super(TFGPT2LMHeadModel, self).__init__(config, *inputs, **kwargs)
         self.transformer = TFGPT2MainLayer(config, name='transformer')
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         transformer_outputs = self.transformer(inputs, training=training)
         hidden_states = transformer_outputs[0]
@@ -675,7 +680,7 @@ class TFGPT2DoubleHeadsModel(TFGPT2PreTrainedModel):
         self.multiple_choice_head = TFSequenceSummary(config, name='multiple_choice_head')
 
 
-    @tf.function
+    # @tf.function
     def call(self, inputs, training=False):
         if not isinstance(inputs, (dict, tuple, list)):
             input_ids = inputs