convert_to_records.py路徑修改

# Copyright 2015 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#
#     http://www.apache.org/licenses/LICENSE-2.0
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# ==============================================================================

"""Converts MNIST data to TFRecords file format with Example protos."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import argparse
import os
import sys

import tensorflow as tf

from tensorflow.contrib.learn.python.learn.datasets import mnist

FLAGS = None


def _int64_feature(value):
  return tf.train.Feature(int64_list=tf.train.Int64List(value=[value]))


def _bytes_feature(value):
  return tf.train.Feature(bytes_list=tf.train.BytesList(value=[value]))


def convert_to(data_set, name):
  """Converts a dataset to tfrecords."""
  images = data_set.images
  labels = data_set.labels
  num_examples = data_set.num_examples

  if images.shape[0] != num_examples:
    raise ValueError('Images size %d does not match label size %d.' %
                     (images.shape[0], num_examples))
  rows = images.shape[1]
  cols = images.shape[2]
  depth = images.shape[3]

  filename = os.path.join(FLAGS.directory, name + '.tfrecords')
  print('Writing', filename)
  writer = tf.python_io.TFRecordWriter(filename)
  for index in range(num_examples):
    image_raw = images[index].tostring()
    example = tf.train.Example(features=tf.train.Features(feature={
        'height': _int64_feature(rows),
        'width': _int64_feature(cols),
        'depth': _int64_feature(depth),
        'label': _int64_feature(int(labels[index])),
        'image_raw': _bytes_feature(image_raw)}))
    writer.write(example.SerializeToString())
  writer.close()


def main(unused_argv):
  # Get the data.
  data_sets = mnist.read_data_sets(FLAGS.directory,
                                   dtype=tf.uint8,
                                   reshape=False,
                                   validation_size=FLAGS.validation_size)

  # Convert to Examples and write the result to TFRecords.
  convert_to(data_sets.train, 'train')
  convert_to(data_sets.validation, 'validation')
  convert_to(data_sets.test, 'test')


if __name__ == '__main__':
  parser = argparse.ArgumentParser()
  parser.add_argument(
      '--directory',
      type=str,
      default='/tmp/data',
      help='Directory to download data files and write the converted result'
  )
  parser.add_argument(
      '--validation_size',
      type=int,
      default=5000,
      help="""\
      Number of examples to separate from the training data for the validation
      set.\
      """
  )
  FLAGS, unparsed = parser.parse_known_args()
  tf.app.run(main=main, argv=[sys.argv[0]] + unparsed)

這段代碼是用來轉換MNIST到標準的tensorflow格式——TFRecords的，默認路徑寫在了/tmp/data下。我這裏直接改成了MNIST_data/ ，然後裏面放上MNIST的那四個gz文件就可以了。這是修改路徑的方法。運行結果是


Extracting MNIST_data/train-images-idx3-ubyte.gz
Extracting MNIST_data/train-labels-idx1-ubyte.gz
Extracting MNIST_data/t10k-images-idx3-ubyte.gz
Extracting MNIST_data/t10k-labels-idx1-ubyte.gz
Writing MNIST_data/train.tfrecords
Writing MNIST_data/validation.tfrecords
Writing MNIST_data/test.tfrecords
然後在MNIST_data/ 下可以看到生成的三個TFRecords文件。


最終目標是訓練自己的圖片，初步懷疑gz解壓縮以後就是原始圖片，明天可以嘗試把自己的圖片也弄成gz文件然後生成TFRecords。另外，接着嘗試從隊列中讀取數據。對比教程和官方教程。