2019-09-13 19:12:50 +02:00
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# Copyright (c) 2019 NVIDIA CORPORATION. All rights reserved.
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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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2019-07-25 16:53:05 +02:00
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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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import collections
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import json
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import math
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import os
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import random
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import modeling
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import optimization
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import tokenization
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import six
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import tensorflow as tf
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import horovod.tensorflow as hvd
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import time
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import csv
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flags = tf.flags
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FLAGS = None
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def extract_flags():
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## Required parameters
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flags.DEFINE_string(
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"data_dir", None,
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"The input data dir. Should contain the .tsv files (or other data files) "
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"for the task.")
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flags.DEFINE_string("task_name", None, "The name of the task to train.")
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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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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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flags.DEFINE_integer(
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"max_seq_length", 128,
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"The maximum total input sequence length after WordPiece tokenization. "
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"Sequences longer than this will be truncated, and sequences shorter "
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"than this will be padded.")
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flags.DEFINE_bool(
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"verbose_logging", False,
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"If true, all of the warnings related to data processing will be printed. "
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"A number of warnings are expected for a normal SQuAD evaluation.")
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flags.mark_flag_as_required("data_dir")
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flags.mark_flag_as_required("task_name")
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flags.mark_flag_as_required("vocab_file")
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return flags.FLAGS
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class InputExample(object):
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"""A single training/test example for simple sequence classification."""
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def __init__(self, guid, text_a, text_b=None, label=None):
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"""Constructs a InputExample.
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Args:
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guid: Unique id for the example.
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text_a: string. The untokenized text of the first sequence. For single
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sequence tasks, only this sequence must be specified.
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text_b: (Optional) string. The untokenized text of the second sequence.
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Only must be specified for sequence pair tasks.
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label: (Optional) string. The label of the example. This should be
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specified for train and dev examples, but not for test examples.
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"""
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self.guid = guid
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self.text_a = text_a
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self.text_b = text_b
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self.label = label
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class PaddingInputExample(object):
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"""Fake example so the num input examples is a multiple of the batch size.
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When running eval/predict on the TPU, we need to pad the number of examples
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to be a multiple of the batch size, because the TPU requires a fixed batch
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size. The alternative is to drop the last batch, which is bad because it means
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the entire output data won't be generated.
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We use this class instead of `None` because treating `None` as padding
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battches could cause silent errors.
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"""
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class InputFeatures(object):
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"""A single set of features of data."""
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def __init__(self,
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input_ids,
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input_mask,
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segment_ids,
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label_id,
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is_real_example=True):
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self.input_ids = input_ids
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self.input_mask = input_mask
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self.segment_ids = segment_ids
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self.label_id = label_id
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self.is_real_example = is_real_example
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class DataProcessor(object):
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"""Base class for data converters for sequence classification data sets."""
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def get_train_examples(self, data_dir):
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"""Gets a collection of `InputExample`s for the train set."""
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raise NotImplementedError()
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def get_dev_examples(self, data_dir):
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"""Gets a collection of `InputExample`s for the dev set."""
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raise NotImplementedError()
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def get_test_examples(self, data_dir):
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"""Gets a collection of `InputExample`s for prediction."""
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raise NotImplementedError()
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def get_labels(self):
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"""Gets the list of labels for this data set."""
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raise NotImplementedError()
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@classmethod
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def _read_tsv(cls, input_file, quotechar=None):
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"""Reads a tab separated value file."""
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with tf.gfile.Open(input_file, "r") as f:
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reader = csv.reader(f, delimiter="\t", quotechar=quotechar)
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lines = []
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for line in reader:
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lines.append(line)
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return lines
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class XnliProcessor(DataProcessor):
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"""Processor for the XNLI data set."""
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def __init__(self):
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self.language = "zh"
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def get_train_examples(self, data_dir):
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"""See base class."""
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lines = self._read_tsv(
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os.path.join(data_dir, "multinli",
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"multinli.train.%s.tsv" % self.language))
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examples = []
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for (i, line) in enumerate(lines):
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if i == 0:
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continue
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guid = "train-%d" % (i)
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text_a = tokenization.convert_to_unicode(line[0])
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text_b = tokenization.convert_to_unicode(line[1])
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label = tokenization.convert_to_unicode(line[2])
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if label == tokenization.convert_to_unicode("contradictory"):
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label = tokenization.convert_to_unicode("contradiction")
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examples.append(
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InputExample(guid=guid, text_a=text_a, text_b=text_b, label=label))
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return examples
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def get_dev_examples(self, data_dir):
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"""See base class."""
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lines = self._read_tsv(os.path.join(data_dir, "xnli.dev.tsv"))
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examples = []
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for (i, line) in enumerate(lines):
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if i == 0:
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continue
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guid = "dev-%d" % (i)
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language = tokenization.convert_to_unicode(line[0])
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if language != tokenization.convert_to_unicode(self.language):
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continue
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text_a = tokenization.convert_to_unicode(line[6])
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text_b = tokenization.convert_to_unicode(line[7])
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label = tokenization.convert_to_unicode(line[1])
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examples.append(
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InputExample(guid=guid, text_a=text_a, text_b=text_b, label=label))
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return examples
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def get_labels(self):
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"""See base class."""
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return ["contradiction", "entailment", "neutral"]
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class MnliProcessor(DataProcessor):
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"""Processor for the MultiNLI data set (GLUE version)."""
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def get_train_examples(self, data_dir):
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"""See base class."""
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return self._create_examples(
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self._read_tsv(os.path.join(data_dir, "train.tsv")), "train")
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def get_dev_examples(self, data_dir):
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"""See base class."""
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return self._create_examples(
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self._read_tsv(os.path.join(data_dir, "dev_matched.tsv")),
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"dev_matched")
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def get_test_examples(self, data_dir):
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"""See base class."""
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return self._create_examples(
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self._read_tsv(os.path.join(data_dir, "test_matched.tsv")), "test")
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def get_labels(self):
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"""See base class."""
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return ["contradiction", "entailment", "neutral"]
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def _create_examples(self, lines, set_type):
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"""Creates examples for the training and dev sets."""
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examples = []
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for (i, line) in enumerate(lines):
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if i == 0:
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continue
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guid = "%s-%s" % (set_type, tokenization.convert_to_unicode(line[0]))
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text_a = tokenization.convert_to_unicode(line[8])
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text_b = tokenization.convert_to_unicode(line[9])
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if set_type == "test":
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label = "contradiction"
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else:
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label = tokenization.convert_to_unicode(line[-1])
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examples.append(
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InputExample(guid=guid, text_a=text_a, text_b=text_b, label=label))
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return examples
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class MrpcProcessor(DataProcessor):
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"""Processor for the MRPC data set (GLUE version)."""
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def get_train_examples(self, data_dir):
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"""See base class."""
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return self._create_examples(
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self._read_tsv(os.path.join(data_dir, "train.tsv")), "train")
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def get_dev_examples(self, data_dir):
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"""See base class."""
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return self._create_examples(
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self._read_tsv(os.path.join(data_dir, "dev.tsv")), "dev")
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def get_test_examples(self, data_dir):
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"""See base class."""
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return self._create_examples(
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self._read_tsv(os.path.join(data_dir, "test.tsv")), "test")
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def get_labels(self):
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"""See base class."""
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return ["0", "1"]
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def _create_examples(self, lines, set_type):
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"""Creates examples for the training and dev sets."""
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examples = []
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for (i, line) in enumerate(lines):
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if i == 0:
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continue
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guid = "%s-%s" % (set_type, i)
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text_a = tokenization.convert_to_unicode(line[3])
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text_b = tokenization.convert_to_unicode(line[4])
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if set_type == "test":
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label = "0"
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else:
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label = tokenization.convert_to_unicode(line[0])
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examples.append(
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InputExample(guid=guid, text_a=text_a, text_b=text_b, label=label))
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return examples
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class ColaProcessor(DataProcessor):
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"""Processor for the CoLA data set (GLUE version)."""
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def get_train_examples(self, data_dir):
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"""See base class."""
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return self._create_examples(
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self._read_tsv(os.path.join(data_dir, "train.tsv")), "train")
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def get_dev_examples(self, data_dir):
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"""See base class."""
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return self._create_examples(
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self._read_tsv(os.path.join(data_dir, "dev.tsv")), "dev")
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def get_test_examples(self, data_dir):
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"""See base class."""
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return self._create_examples(
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self._read_tsv(os.path.join(data_dir, "test.tsv")), "test")
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def get_labels(self):
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"""See base class."""
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return ["0", "1"]
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def _create_examples(self, lines, set_type):
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"""Creates examples for the training and dev sets."""
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examples = []
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for (i, line) in enumerate(lines):
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# Only the test set has a header
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if set_type == "test" and i == 0:
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continue
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guid = "%s-%s" % (set_type, i)
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if set_type == "test":
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text_a = tokenization.convert_to_unicode(line[1])
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label = "0"
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else:
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text_a = tokenization.convert_to_unicode(line[3])
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label = tokenization.convert_to_unicode(line[1])
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examples.append(
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InputExample(guid=guid, text_a=text_a, text_b=None, label=label))
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return examples
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def _truncate_seq_pair(tokens_a, tokens_b, max_length):
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"""Truncates a sequence pair in place to the maximum length."""
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# This is a simple heuristic which will always truncate the longer sequence
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# one token at a time. This makes more sense than truncating an equal percent
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# of tokens from each, since if one sequence is very short then each token
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# that's truncated likely contains more information than a longer sequence.
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while True:
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total_length = len(tokens_a) + len(tokens_b)
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if total_length <= max_length:
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break
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if len(tokens_a) > len(tokens_b):
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tokens_a.pop()
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else:
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tokens_b.pop()
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def convert_single_example(ex_index, example, label_list, max_seq_length,
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tokenizer, verbose_logging=False):
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"""Converts a single `InputExample` into a single `InputFeatures`."""
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if isinstance(example, PaddingInputExample):
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return InputFeatures(
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input_ids=[0] * max_seq_length,
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input_mask=[0] * max_seq_length,
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segment_ids=[0] * max_seq_length,
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label_id=0,
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is_real_example=False)
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label_map = {}
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for (i, label) in enumerate(label_list):
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label_map[label] = i
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tokens_a = tokenizer.tokenize(example.text_a)
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tokens_b = None
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if example.text_b:
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tokens_b = tokenizer.tokenize(example.text_b)
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if tokens_b:
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# Modifies `tokens_a` and `tokens_b` in place so that the total
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# length is less than the specified length.
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# Account for [CLS], [SEP], [SEP] with "- 3"
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_truncate_seq_pair(tokens_a, tokens_b, max_seq_length - 3)
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else:
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# Account for [CLS] and [SEP] with "- 2"
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if len(tokens_a) > max_seq_length - 2:
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tokens_a = tokens_a[0:(max_seq_length - 2)]
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# The convention in BERT is:
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# (a) For sequence pairs:
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# tokens: [CLS] is this jack ##son ##ville ? [SEP] no it is not . [SEP]
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# type_ids: 0 0 0 0 0 0 0 0 1 1 1 1 1 1
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# (b) For single sequences:
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# tokens: [CLS] the dog is hairy . [SEP]
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# type_ids: 0 0 0 0 0 0 0
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#
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# Where "type_ids" are used to indicate whether this is the first
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# sequence or the second sequence. The embedding vectors for `type=0` and
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# `type=1` were learned during pre-training and are added to the wordpiece
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# embedding vector (and position vector). This is not *strictly* necessary
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# since the [SEP] token unambiguously separates the sequences, but it makes
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# it easier for the model to learn the concept of sequences.
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#
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# For classification tasks, the first vector (corresponding to [CLS]) is
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# used as the "sentence vector". Note that this only makes sense because
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# the entire model is fine-tuned.
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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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tokens.append("[SEP]")
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segment_ids.append(0)
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if tokens_b:
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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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input_ids = tokenizer.convert_tokens_to_ids(tokens)
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# The mask has 1 for real tokens and 0 for padding tokens. Only real
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# tokens are attended to.
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input_mask = [1] * len(input_ids)
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# Zero-pad up to the sequence length.
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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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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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label_id = label_map[example.label]
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if ex_index < 5 and verbose_logging:
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tf.logging.info("*** Example ***")
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tf.logging.info("guid: %s" % (example.guid))
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tf.logging.info("tokens: %s" % " ".join(
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[tokenization.printable_text(x) for x in tokens]))
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tf.logging.info("input_ids: %s" % " ".join([str(x) for x in input_ids]))
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tf.logging.info("input_mask: %s" % " ".join([str(x) for x in input_mask]))
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tf.logging.info("segment_ids: %s" % " ".join([str(x) for x in segment_ids]))
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tf.logging.info("label: %s (id = %d)" % (example.label, label_id))
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feature = InputFeatures(
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input_ids=input_ids,
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input_mask=input_mask,
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segment_ids=segment_ids,
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label_id=label_id,
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|
is_real_example=True)
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|
return feature
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|
# This function is not used by this file but is still used by the Colab and
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|
# people who depend on it.
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|
|
def convert_examples_to_features(examples, label_list, max_seq_length,
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|
|
tokenizer):
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|
|
"""Convert a set of `InputExample`s to a list of `InputFeatures`."""
|
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|
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|
|
features = []
|
|
|
|
for (ex_index, example) in enumerate(examples):
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|
|
if ex_index % 10000 == 0:
|
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|
|
tf.logging.info("Writing example %d of %d" % (ex_index, len(examples)))
|
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|
|
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|
feature = convert_single_example(ex_index, example, label_list,
|
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|
|
max_seq_length, tokenizer, FLAGS.verbose_logging)
|
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|
|
|
|
|
|
features.append(feature)
|
|
|
|
return features
|
|
|
|
|
|
|
|
def file_based_convert_examples_to_features(
|
|
|
|
examples, label_list, max_seq_length, tokenizer, output_file):
|
|
|
|
"""Convert a set of `InputExample`s to a TFRecord file."""
|
|
|
|
|
|
|
|
writer = tf.python_io.TFRecordWriter(output_file)
|
|
|
|
|
|
|
|
for (ex_index, example) in enumerate(examples):
|
|
|
|
if ex_index % 10000 == 0:
|
|
|
|
tf.logging.info("Writing example %d of %d" % (ex_index, len(examples)))
|
|
|
|
|
|
|
|
feature = convert_single_example(ex_index, example, label_list,
|
|
|
|
max_seq_length, tokenizer)
|
|
|
|
|
|
|
|
def create_int_feature(values):
|
|
|
|
f = tf.train.Feature(int64_list=tf.train.Int64List(value=list(values)))
|
|
|
|
return f
|
|
|
|
|
|
|
|
features = collections.OrderedDict()
|
|
|
|
features["input_ids"] = create_int_feature(feature.input_ids)
|
|
|
|
features["input_mask"] = create_int_feature(feature.input_mask)
|
|
|
|
features["segment_ids"] = create_int_feature(feature.segment_ids)
|
|
|
|
features["label_ids"] = create_int_feature([feature.label_id])
|
|
|
|
features["is_real_example"] = create_int_feature(
|
|
|
|
[int(feature.is_real_example)])
|
|
|
|
|
|
|
|
tf_example = tf.train.Example(features=tf.train.Features(feature=features))
|
|
|
|
writer.write(tf_example.SerializeToString())
|
|
|
|
writer.close()
|
|
|
|
|
|
|
|
def main():
|
|
|
|
processors = {
|
|
|
|
"cola": ColaProcessor,
|
|
|
|
"mnli": MnliProcessor,
|
|
|
|
"mrpc": MrpcProcessor,
|
|
|
|
"xnli": XnliProcessor,
|
|
|
|
}
|
|
|
|
task_name = FLAGS.task_name.lower()
|
|
|
|
if task_name not in processors:
|
|
|
|
raise ValueError("Task not found: %s" % (task_name))
|
|
|
|
processor = processors[task_name]()
|
|
|
|
label_list = processor.get_labels()
|
|
|
|
|
|
|
|
tokenizer = tokenization.FullTokenizer(
|
|
|
|
vocab_file=FLAGS.vocab_file, do_lower_case=FLAGS.do_lower_case)
|
|
|
|
tf.gfile.MakeDirs(FLAGS.data_dir + "final_tfrecords_sharded")
|
|
|
|
train_examples = processor.get_train_examples(FLAGS.data_dir)
|
|
|
|
train_file = os.path.join(FLAGS.data_dir, "final_tfrecords_sharded/" + task_name + "train.tf_record")
|
|
|
|
file_based_convert_examples_to_features(
|
|
|
|
train_examples, label_list, FLAGS.max_seq_length, tokenizer, train_file)
|
|
|
|
|
|
|
|
eval_examples = processor.get_dev_examples(FLAGS.data_dir)
|
|
|
|
eval_file = os.path.join(FLAGS.data_dir, "final_tfrecords_sharded/" + task_name + "eval.tf_record")
|
|
|
|
file_based_convert_examples_to_features(
|
|
|
|
eval_examples, label_list, FLAGS.max_seq_length, tokenizer, eval_file)
|
|
|
|
|
|
|
|
predict_examples = processor.get_test_examples(FLAGS.data_dir)
|
|
|
|
predict_file = os.path.join(FLAGS.data_dir, "final_tfrecords_sharded/" + task_name + "predict.tf_record")
|
|
|
|
file_based_convert_examples_to_features(predict_examples, label_list,
|
|
|
|
FLAGS.max_seq_length, tokenizer,
|
|
|
|
predict_file)
|
|
|
|
|
|
|
|
if __name__ == "__main__":
|
|
|
|
main()
|