python bert code

pytorch-bert-code/bert/convert_tf_checkpoint_to_pytorch.py

@@ -0,0 +1,105 @@
+# coding=utf-8
+# Copyright 2018 The HugginFace 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.
+"""Convert BERT checkpoint."""
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import re
+import argparse
+import tensorflow as tf
+import torch
+import numpy as np
+
+from modeling import BertConfig, BertModel
+
+parser = argparse.ArgumentParser()
+
+## Required parameters
+parser.add_argument("--tf_checkpoint_path",
+                    default = None,
+                    type = str,
+                    required = True,
+                    help = "Path the TensorFlow checkpoint path.")
+parser.add_argument("--bert_config_file",
+                    default = None,
+                    type = str,
+                    required = True,
+                    help = "The config json file corresponding to the pre-trained BERT model. \n"
+                        "This specifies the model architecture.")
+parser.add_argument("--pytorch_dump_path",
+                    default = None,
+                    type = str,
+                    required = True,
+                    help = "Path to the output PyTorch model.")
+
+args = parser.parse_args()
+
+def convert():
+    # Initialise PyTorch model
+    config = BertConfig.from_json_file(args.bert_config_file)
+    model = BertModel(config)
+
+    # Load weights from TF model
+    path = args.tf_checkpoint_path
+    print("Converting TensorFlow checkpoint from {}".format(path))
+
+    init_vars = tf.train.list_variables(path)
+    names = []
+    arrays = []
+    for name, shape in init_vars:
+        print("Loading {} with shape {}".format(name, shape))
+        array = tf.train.load_variable(path, name)
+        print("Numpy array shape {}".format(array.shape))
+        names.append(name)
+        arrays.append(array)
+
+    for name, array in zip(names, arrays):
+        name = name[5:]  # skip "bert/"
+        print("Loading {}".format(name))
+        name = name.split('/')
+        if name[0] in ['redictions', 'eq_relationship']:
+            print("Skipping")
+            continue
+        pointer = model
+        for m_name in name:
+            if re.fullmatch(r'[A-Za-z]+_\d+', m_name):
+                l = re.split(r'_(\d+)', m_name)
+            else:
+                l = [m_name]
+            if l[0] == 'kernel':
+                pointer = getattr(pointer, 'weight')
+            else:
+                pointer = getattr(pointer, l[0])
+            if len(l) >= 2:
+                num = int(l[1])
+                pointer = pointer[num]
+        if m_name[-11:] == '_embeddings':
+            pointer = getattr(pointer, 'weight')
+        elif m_name == 'kernel':
+            array = np.transpose(array)
+        try:
+            assert pointer.shape == array.shape
+        except AssertionError as e:
+            e.args += (pointer.shape, array.shape)
+            raise
+        pointer.data = torch.from_numpy(array)
+
+    # Save pytorch-model
+    torch.save(model.state_dict(), args.pytorch_dump_path)
+
+if __name__ == "__main__":
+    convert()

pytorch-bert-code/bert/run.sh

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+python3 convert_tf_checkpoint_to_pytorch.py --tf_checkpoint_path bert_model.ckpt --bert_config_file bert_config.json --pytorch_dump_path bert_model.bin