# 1. 寫入過程
# 一張圖片，我寫入了其內(nèi)容，label，長和寬幾個信息
tf_example = tf.train.Example(
    features=tf.train.Features(feature={
      'encoded': bytes_feature(encoded_jpg),
      'label': int64_feature(label),
      'height': int64_feature(height),
      'width': int64_feature(width)}))
# 2. 讀取過程
# 定義解析的TFRecord數(shù)據(jù)格式
def _parse_image(example_proto):
   features = {'encoded':tf.FixedLenFeature((),tf.string),
  'label': tf.FixedLenFeature((), tf.int64),
  'height': tf.FixedLenFeature((), tf.int64),
  'width': tf.FixedLenFeature((), tf.int64)
}
return tf.parse_single_example(example_proto, features)
 
# TFRecord數(shù)據(jù)按照Feature解析出對應(yīng)的真實數(shù)據(jù)
ds = ds.map(lambda x : _parse_image(x), num_parallel_calls=4)

#!/usr/bin/python
# -*- coding: utf-8 -*-
 
import sys
import tensorflow as tf
 
# 用法：python trackTFRecord.py True file1 file2 
# trackTFRecord.py 就是當(dāng)前這個py文件
# True 表示是否輸出具體的數(shù)據(jù)
# file1 file2 表示的是需要查看的TFRecord文件的絕對路徑
# 輸出說明：tf.float32對應(yīng)TFRecord的FloatList，tf.int64對應(yīng)Int64List，tf.string對應(yīng)BytesList
def main():
  print('TFRecord文件個數(shù)為{0}個'.format(len(sys.argv)-2))
  for i in range(2, len(sys.argv)):
    filepath = sys.argv[i]
    with tf.Session() as sess:
      filenames = [filepath]
      # 加載TFRecord數(shù)據(jù)
      ds = tf.data.TFRecordDataset(filenames)
      ds = ds.batch(10)
      ds = ds.prefetch(buffer_size=tf.contrib.data.AUTOTUNE)
      iterator = ds.make_one_shot_iterator()
      # 為了加快速度，僅僅簡單拿一組數(shù)據(jù)看下結(jié)構(gòu)
      batch_data = iterator.get_next()
      res = sess.run(batch_data)
      serialized_example = res[0]
      example_proto = tf.train.Example.FromString(serialized_example)
      features = example_proto.features
      print('{0} 信息如下：'.format(filepath))
      for key in features.feature:
        feature = features.feature[key]
        ftype = None
        fvalue = None
        if len(feature.bytes_list.value) > 0:
          ftype = 'bytes_list'
          fvalue = feature.bytes_list.value
          
        if len(feature.float_list.value) > 0:
          ftype = 'float_list'
          fvalue = feature.float_list.value
          
        if len(feature.int64_list.value) > 0:
          ftype = 'int64_list'
          fvalue = feature.int64_list.value
        
        result = '{0} : {1}'.format(key, ftype)
        if 'True' == sys.argv[1]:
          result = '{0} : {1}'.format(result, fvalue)
        print(result) 
 
if __name__ == "__main__":
  main()

import tensorflow as tf
 
filename = "/Users/zhanhaitao/Desktop/1.png"
# 使用tf.read_file讀進圖片數(shù)據(jù)
image = tf.read_file(filename)
# 主要是為了獲取圖片的寬高
image_jpeg = tf.image.decode_jpeg(image, channels=3, name="decode_jpeg_picture")
# reshape圖片到原始大小2500x2000x3
image_jpeg = tf.reshape(image_jpeg, shape=(2500,2000,3))
# 獲取圖片shape數(shù)據(jù)
img_shape = image_jpeg.shape
width = img_shape[0]
height = img_shape[1]
# 將原圖片tensor生成bytes對象， image將保存到tfrecord
sess = tf.Session()
image = sess.run(image)
sess.close()
# 定義TFRecords文件的保存路徑及其文件名
path_none = "/Users/zhanhaitao/Desktop/a.tfrecord"
# 定義不同壓縮選項的TFRecordWriter
writer_none = tf.python_io.TFRecordWriter(path_none, options=None)
# 將外層features生成特定格式的example
example_none = tf.train.Example(features=tf.train.Features(feature={
"float_val":tf.train.Feature(float_list=tf.train.FloatList(value=[9.99])),
"width":tf.train.Feature(int64_list=tf.train.Int64List(value=[width])),
"height":tf.train.Feature(int64_list=tf.train.Int64List(value=[height])),
"image_raw":tf.train.Feature(bytes_list=tf.train.BytesList(value=[image]))
}))
# example系列化字符串
example_str_none = example_none.SerializeToString()
# 將系列化字符串寫入?yún)f(xié)議緩沖區(qū)
writer_none.write(example_str_none)
 
# 關(guān)閉TFRecords文件操作接口
writer_none.close()
 
print("finish to write data to tfrecord file!")

python trackTFRecord.py False /Users/zhanhaitao/Desktop/a.tfrecord
# 結(jié)果，其中bytes_list對應(yīng)tf.string，int64_list對應(yīng)tf.int64 float_list對應(yīng)tf.float32
# image_raw : bytes_list
# width : int64_list
# float_val : float_list
# height : int64_list