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@@ -1,442 +0,0 @@
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-# coding=utf-8
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-# Copyright 2018 The Google AI Language Team Authors.
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-#
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-# Licensed under the Apache License, Version 2.0 (the "License");
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-# you may not use this file except in compliance with the License.
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-# You may obtain a copy of the License at
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-#
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-# http://www.apache.org/licenses/LICENSE-2.0
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-#
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-# Unless required by applicable law or agreed to in writing, software
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-# distributed under the License is distributed on an "AS IS" BASIS,
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-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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-# See the License for the specific language governing permissions and
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-# limitations under the License.
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-"""Create masked LM/next sentence masked_lm TF examples for BERT."""
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-
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-from __future__ import absolute_import
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-from __future__ import division
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-from __future__ import print_function
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-
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-import collections
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-import random
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-import tokenization
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-import tensorflow as tf
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-
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-flags = tf.flags
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-
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-FLAGS = flags.FLAGS
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-
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-flags.DEFINE_string("input_file", None,
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- "Input raw text file (or comma-separated list of files).")
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-
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-flags.DEFINE_string(
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- "output_file", None,
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- "Output TF example file (or comma-separated list of files).")
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-
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-flags.DEFINE_string("vocab_file", None,
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- "The vocabulary file that the BERT model was trained on.")
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-
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-flags.DEFINE_bool(
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- "do_lower_case", True,
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- "Whether to lower case the input text. Should be True for uncased "
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- "models and False for cased models.")
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-
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-flags.DEFINE_integer("max_seq_length", 128, "Maximum sequence length.")
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-
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-flags.DEFINE_integer("max_predictions_per_seq", 20,
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- "Maximum number of masked LM predictions per sequence.")
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-
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-flags.DEFINE_integer("random_seed", 12345, "Random seed for data generation.")
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-
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-flags.DEFINE_integer(
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- "dupe_factor", 10,
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- "Number of times to duplicate the input data (with different masks).")
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-
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-flags.DEFINE_float("masked_lm_prob", 0.15, "Masked LM probability.")
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-
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-flags.DEFINE_float(
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- "short_seq_prob", 0.1,
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- "Probability of creating sequences which are shorter than the "
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- "maximum length.")
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-
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-
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-class TrainingInstance(object):
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- """A single training instance (sentence pair)."""
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-
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- def __init__(self, tokens, segment_ids, masked_lm_positions, masked_lm_labels,
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- is_random_next):
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- self.tokens = tokens
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- self.segment_ids = segment_ids
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- self.is_random_next = is_random_next
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- self.masked_lm_positions = masked_lm_positions
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- self.masked_lm_labels = masked_lm_labels
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-
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- def __str__(self):
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- s = ""
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- s += "tokens: %s\n" % (" ".join(
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- [tokenization.printable_text(x) for x in self.tokens]))
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- s += "segment_ids: %s\n" % (" ".join([str(x) for x in self.segment_ids]))
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- s += "is_random_next: %s\n" % self.is_random_next
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- s += "masked_lm_positions: %s\n" % (" ".join(
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- [str(x) for x in self.masked_lm_positions]))
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- s += "masked_lm_labels: %s\n" % (" ".join(
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- [tokenization.printable_text(x) for x in self.masked_lm_labels]))
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- s += "\n"
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- return s
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-
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- def __repr__(self):
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- return self.__str__()
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-
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-
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-def write_instance_to_example_files(instances, tokenizer, max_seq_length,
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- max_predictions_per_seq, output_files):
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- """Create TF example files from `TrainingInstance`s."""
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- writers = []
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- for output_file in output_files:
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- writers.append(tf.python_io.TFRecordWriter(output_file))
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-
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- writer_index = 0
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-
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- total_written = 0
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- for (inst_index, instance) in enumerate(instances):
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- input_ids = tokenizer.convert_tokens_to_ids(instance.tokens)
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- input_mask = [1] * len(input_ids)
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- segment_ids = list(instance.segment_ids)
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- assert len(input_ids) <= max_seq_length
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-
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- while len(input_ids) < max_seq_length:
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- input_ids.append(0)
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- input_mask.append(0)
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- segment_ids.append(0)
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-
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- assert len(input_ids) == max_seq_length
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- assert len(input_mask) == max_seq_length
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- assert len(segment_ids) == max_seq_length
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-
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- masked_lm_positions = list(instance.masked_lm_positions)
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- masked_lm_ids = tokenizer.convert_tokens_to_ids(instance.masked_lm_labels)
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- masked_lm_weights = [1.0] * len(masked_lm_ids)
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-
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- while len(masked_lm_positions) < max_predictions_per_seq:
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- masked_lm_positions.append(0)
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- masked_lm_ids.append(0)
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- masked_lm_weights.append(0.0)
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-
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- next_sentence_label = 1 if instance.is_random_next else 0
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-
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- features = collections.OrderedDict()
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- features["input_ids"] = create_int_feature(input_ids)
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- features["input_mask"] = create_int_feature(input_mask)
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- features["segment_ids"] = create_int_feature(segment_ids)
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- features["masked_lm_positions"] = create_int_feature(masked_lm_positions)
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- features["masked_lm_ids"] = create_int_feature(masked_lm_ids)
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- features["masked_lm_weights"] = create_float_feature(masked_lm_weights)
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- features["next_sentence_labels"] = create_int_feature([next_sentence_label])
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-
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- tf_example = tf.train.Example(features=tf.train.Features(feature=features))
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-
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- writers[writer_index].write(tf_example.SerializeToString())
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- writer_index = (writer_index + 1) % len(writers)
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-
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- total_written += 1
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-
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- if inst_index < 20:
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- tf.logging.info("*** Example ***")
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- tf.logging.info("tokens: %s" % " ".join(
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- [tokenization.printable_text(x) for x in instance.tokens]))
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-
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- for feature_name in features.keys():
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- feature = features[feature_name]
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- values = []
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- if feature.int64_list.value:
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- values = feature.int64_list.value
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- elif feature.float_list.value:
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- values = feature.float_list.value
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- tf.logging.info(
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- "%s: %s" % (feature_name, " ".join([str(x) for x in values])))
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-
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- for writer in writers:
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- writer.close()
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-
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- tf.logging.info("Wrote %d total instances", total_written)
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-
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-
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-def create_int_feature(values):
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- feature = tf.train.Feature(int64_list=tf.train.Int64List(value=list(values)))
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- return feature
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-
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-
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-def create_float_feature(values):
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- feature = tf.train.Feature(float_list=tf.train.FloatList(value=list(values)))
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- return feature
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-
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-
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-def create_training_instances(input_files, tokenizer, max_seq_length,
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- dupe_factor, short_seq_prob, masked_lm_prob,
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- max_predictions_per_seq, rng):
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- """Create `TrainingInstance`s from raw text."""
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- all_documents = [[]]
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-
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- # Input file format:
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- # (1) One sentence per line. These should ideally be actual sentences, not
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- # entire paragraphs or arbitrary spans of text. (Because we use the
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- # sentence boundaries for the "next sentence prediction" task).
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- # (2) Blank lines between documents. Document boundaries are needed so
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- # that the "next sentence prediction" task doesn't span between documents.
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- for input_file in input_files:
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- with tf.gfile.GFile(input_file, "r") as reader:
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- while True:
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- line = tokenization.convert_to_unicode(reader.readline())
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- if not line:
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- break
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- line = line.strip()
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-
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- # Empty lines are used as document delimiters
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- if not line:
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- all_documents.append([])
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- tokens = tokenizer.tokenize(line)
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- if tokens:
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- all_documents[-1].append(tokens)
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-
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- # Remove empty documents
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- all_documents = [x for x in all_documents if x]
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- rng.shuffle(all_documents)
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-
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- vocab_words = list(tokenizer.vocab.keys())
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- instances = []
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- for _ in range(dupe_factor):
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- for document_index in range(len(all_documents)):
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- instances.extend(
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- create_instances_from_document(
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- all_documents, document_index, max_seq_length, short_seq_prob,
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- masked_lm_prob, max_predictions_per_seq, vocab_words, rng))
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-
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- rng.shuffle(instances)
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- return instances
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-
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-
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-def create_instances_from_document(
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- all_documents, document_index, max_seq_length, short_seq_prob,
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- masked_lm_prob, max_predictions_per_seq, vocab_words, rng):
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- """Creates `TrainingInstance`s for a single document."""
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- document = all_documents[document_index]
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-
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- # Account for [CLS], [SEP], [SEP]
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- max_num_tokens = max_seq_length - 3
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-
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- # We *usually* want to fill up the entire sequence since we are padding
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- # to `max_seq_length` anyways, so short sequences are generally wasted
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- # computation. However, we *sometimes*
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- # (i.e., short_seq_prob == 0.1 == 10% of the time) want to use shorter
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- # sequences to minimize the mismatch between pre-training and fine-tuning.
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- # The `target_seq_length` is just a rough target however, whereas
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- # `max_seq_length` is a hard limit.
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- target_seq_length = max_num_tokens
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- if rng.random() < short_seq_prob:
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- target_seq_length = rng.randint(2, max_num_tokens)
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-
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- # We DON'T just concatenate all of the tokens from a document into a long
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- # sequence and choose an arbitrary split point because this would make the
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- # next sentence prediction task too easy. Instead, we split the input into
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- # segments "A" and "B" based on the actual "sentences" provided by the user
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- # input.
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- instances = []
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- current_chunk = []
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- current_length = 0
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- i = 0
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- while i < len(document):
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- segment = document[i]
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- current_chunk.append(segment)
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- current_length += len(segment)
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- if i == len(document) - 1 or current_length >= target_seq_length:
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- if current_chunk:
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- # `a_end` is how many segments from `current_chunk` go into the `A`
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- # (first) sentence.
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- a_end = 1
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- if len(current_chunk) >= 2:
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- a_end = rng.randint(1, len(current_chunk) - 1)
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-
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- tokens_a = []
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- for j in range(a_end):
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- tokens_a.extend(current_chunk[j])
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-
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- tokens_b = []
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- # Random next
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- is_random_next = False
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- if len(current_chunk) == 1 or rng.random() < 0.5:
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- is_random_next = True
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- target_b_length = target_seq_length - len(tokens_a)
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-
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- # This should rarely go for more than one iteration for large
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- # corpora. However, just to be careful, we try to make sure that
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- # the random document is not the same as the document
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- # we're processing.
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- for _ in range(10):
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- random_document_index = rng.randint(0, len(all_documents) - 1)
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- if random_document_index != document_index:
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- break
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-
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- random_document = all_documents[random_document_index]
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- random_start = rng.randint(0, len(random_document) - 1)
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- for j in range(random_start, len(random_document)):
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- tokens_b.extend(random_document[j])
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- if len(tokens_b) >= target_b_length:
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- break
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- # We didn't actually use these segments so we "put them back" so
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- # they don't go to waste.
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- num_unused_segments = len(current_chunk) - a_end
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- i -= num_unused_segments
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- # Actual next
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- else:
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- is_random_next = False
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- for j in range(a_end, len(current_chunk)):
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- tokens_b.extend(current_chunk[j])
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- truncate_seq_pair(tokens_a, tokens_b, max_num_tokens, rng)
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-
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- assert len(tokens_a) >= 1
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- assert len(tokens_b) >= 1
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-
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- tokens = []
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- segment_ids = []
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- tokens.append("[CLS]")
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- segment_ids.append(0)
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- for token in tokens_a:
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- tokens.append(token)
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- segment_ids.append(0)
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-
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- tokens.append("[SEP]")
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- segment_ids.append(0)
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-
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- for token in tokens_b:
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- tokens.append(token)
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- segment_ids.append(1)
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- tokens.append("[SEP]")
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- segment_ids.append(1)
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-
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- (tokens, masked_lm_positions,
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- masked_lm_labels) = create_masked_lm_predictions(
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- tokens, masked_lm_prob, max_predictions_per_seq, vocab_words, rng)
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- instance = TrainingInstance(
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- tokens=tokens,
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- segment_ids=segment_ids,
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- is_random_next=is_random_next,
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- masked_lm_positions=masked_lm_positions,
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- masked_lm_labels=masked_lm_labels)
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- instances.append(instance)
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- current_chunk = []
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- current_length = 0
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- i += 1
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-
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- return instances
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-
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-
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-MaskedLmInstance = collections.namedtuple("MaskedLmInstance",
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- ["index", "label"])
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-
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-
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-def create_masked_lm_predictions(tokens, masked_lm_prob,
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- max_predictions_per_seq, vocab_words, rng):
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- """Creates the predictions for the masked LM objective."""
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-
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- cand_indexes = []
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- for (i, token) in enumerate(tokens):
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- if token == "[CLS]" or token == "[SEP]":
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- continue
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- cand_indexes.append(i)
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-
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- rng.shuffle(cand_indexes)
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-
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- output_tokens = list(tokens)
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-
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- num_to_predict = min(max_predictions_per_seq,
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- max(1, int(round(len(tokens) * masked_lm_prob))))
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-
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- masked_lms = []
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- covered_indexes = set()
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- for index in cand_indexes:
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- if len(masked_lms) >= num_to_predict:
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- break
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- if index in covered_indexes:
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- continue
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- covered_indexes.add(index)
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-
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- masked_token = None
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- # 80% of the time, replace with [MASK]
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- if rng.random() < 0.8:
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- masked_token = "[MASK]"
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- else:
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- # 10% of the time, keep original
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- if rng.random() < 0.5:
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- masked_token = tokens[index]
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- # 10% of the time, replace with random word
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- else:
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- masked_token = vocab_words[rng.randint(0, len(vocab_words) - 1)]
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-
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- output_tokens[index] = masked_token
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-
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- masked_lms.append(MaskedLmInstance(index=index, label=tokens[index]))
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-
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- masked_lms = sorted(masked_lms, key=lambda x: x.index)
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-
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- masked_lm_positions = []
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- masked_lm_labels = []
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- for p in masked_lms:
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- masked_lm_positions.append(p.index)
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- masked_lm_labels.append(p.label)
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-
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- return (output_tokens, masked_lm_positions, masked_lm_labels)
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-
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-
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-def truncate_seq_pair(tokens_a, tokens_b, max_num_tokens, rng):
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|
- """Truncates a pair of sequences to a maximum sequence length."""
|
|
|
- while True:
|
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|
- total_length = len(tokens_a) + len(tokens_b)
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|
|
- if total_length <= max_num_tokens:
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|
- break
|
|
|
-
|
|
|
- trunc_tokens = tokens_a if len(tokens_a) > len(tokens_b) else tokens_b
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|
|
- assert len(trunc_tokens) >= 1
|
|
|
-
|
|
|
- # We want to sometimes truncate from the front and sometimes from the
|
|
|
- # back to add more randomness and avoid biases.
|
|
|
- if rng.random() < 0.5:
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|
- del trunc_tokens[0]
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|
|
- else:
|
|
|
- trunc_tokens.pop()
|
|
|
-
|
|
|
-
|
|
|
-def main(_):
|
|
|
- tf.logging.set_verbosity(tf.logging.INFO)
|
|
|
-
|
|
|
- tokenizer = tokenization.FullTokenizer(
|
|
|
- vocab_file=FLAGS.vocab_file, do_lower_case=FLAGS.do_lower_case)
|
|
|
-
|
|
|
- input_files = []
|
|
|
- for input_pattern in FLAGS.input_file.split(","):
|
|
|
- input_files.extend(tf.gfile.Glob(input_pattern))
|
|
|
-
|
|
|
- tf.logging.info("*** Reading from input files ***")
|
|
|
- for input_file in input_files:
|
|
|
- tf.logging.info(" %s", input_file)
|
|
|
-
|
|
|
- rng = random.Random(FLAGS.random_seed)
|
|
|
- instances = create_training_instances(
|
|
|
- input_files, tokenizer, FLAGS.max_seq_length, FLAGS.dupe_factor,
|
|
|
- FLAGS.short_seq_prob, FLAGS.masked_lm_prob, FLAGS.max_predictions_per_seq,
|
|
|
- rng)
|
|
|
-
|
|
|
- output_files = FLAGS.output_file.split(",")
|
|
|
- tf.logging.info("*** Writing to output files ***")
|
|
|
- for output_file in output_files:
|
|
|
- tf.logging.info(" %s", output_file)
|
|
|
-
|
|
|
- write_instance_to_example_files(instances, tokenizer, FLAGS.max_seq_length,
|
|
|
- FLAGS.max_predictions_per_seq, output_files)
|
|
|
-
|
|
|
-
|
|
|
-if __name__ == "__main__":
|
|
|
- flags.mark_flag_as_required("input_file")
|
|
|
- flags.mark_flag_as_required("output_file")
|
|
|
- flags.mark_flag_as_required("vocab_file")
|
|
|
- tf.app.run()
|