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Tensor Flow TFRecord Creation
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"""-------------------------------------------------------------------------------------------------------------------------------------------------- | |
REFERENCE: | |
---------- | |
Code adapted from Google Tensor FLow Git Hub Repositiory: | |
https://github.com/tensorflow/models/blob/f87a58cd96d45de73c9a8330a06b2ab56749a7fa/research/inception/inception/data/build_image_data.py | |
@author: Oluwole Oyetoke | |
@date: 5th December, 2017 | |
@langauge: Python/TF | |
@email: oluwoleoyetoke@gmail.com | |
INTRODUCTION: | |
------------- | |
Converts image dataset to a sharded dataset. The sharded dataset consists of Tensor Flow Records Format (TFRecords) and with Example protos. | |
train_directory/train-00000-of-01024 | |
train_directory/train-00001-of-01024 | |
... | |
train_directory/train-01023-of-01024 | |
and | |
validation_directory/validation-00000-of-00128 | |
validation_directory/validation-00001-of-00128 | |
... | |
validation_directory/validation-00127-of-00128 | |
EXPECTATIONS: | |
------------ | |
1. Image data set should be in .jpeg format | |
2. It is adviced that you have only folders in the base directory containing your training images." | |
"Base folder-->Subfolders-->Each subfolder containing specific classes of image." | |
"E.g Training Folder -> stop_sign_folder -> 1.jpg, 2.jpg, 3.jpg...."; | |
(data_dir/label_0/image0.jpeg | |
(data_dir/label_0/image1.jpg) | |
3.The sub-directory should be the unique label associated with the images in the folder. | |
SHARDS CONTENT: | |
-------------- | |
Where we have selected [x] number of image files per training dataset shard and [y] number of image files per evaluation dataset shard, | |
for each of the shards, each record within the TFRecord file (shard) is a serialized example proto consisting of the following fields: | |
image/encoded: string containing JPEG encoded image in RGB colorspace | |
image/height: integer, image height in pixels | |
image/width: integer, image width in pixels | |
image/colorspace: string, specifying the colorspace, always 'RGB' | |
image/channels: integer, specifying the number of channels, always 3 | |
image/format: string, specifying the format, always 'JPEG' | |
image/filename: string containing the basename of the image file e.g. 'n01440764_10026.JPEG' or 'ILSVRC2012_val_00000293.JPEG' | |
image/class/label:integer specifying the index in a classification layer. The label ranges from [0, num_labels] where 0 is unused and left as the background class. | |
image/class/text: string specifying the human-readable version of the label e.g. 'dog' | |
If your data set involves bounding boxes, please look at build_imagenet_data.py. | |
#IMPORTS | |
-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
from __future__ import absolute_import | |
from __future__ import division | |
from __future__ import print_function | |
from datetime import datetime | |
from PIL import Image | |
from time import sleep | |
import os | |
import random | |
import sys | |
import threading | |
import numpy as np | |
import tensorflow as tf | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
# SETTING SOME GLOBAL DATA | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
tf.app.flags.DEFINE_string('train_directory', '/home/olu/Dev/data_base/sign_base/training_227x227', 'Training data directory') | |
tf.app.flags.DEFINE_string('validation_directory', '/home/olu/Dev/data_base/sign_base/training_227x227', 'Validation data directory') | |
tf.app.flags.DEFINE_string('output_directory', '/home/olu/Dev/data_base/sign_base/output/TFRecord_227x227', 'Output data directory') | |
tf.app.flags.DEFINE_integer('train_shards', 2, 'Number of shards in training TFRecord files.') | |
tf.app.flags.DEFINE_integer('validation_shards', 2, 'Number of shards in validation TFRecord files.') | |
tf.app.flags.DEFINE_integer('num_threads', 2, 'Number of threads to preprocess the images.') | |
tf.app.flags.DEFINE_string('labels_file', '/home/olu/Dev/data_base/sign_base/labels.txt', 'Labels_file.txt') | |
tf.app.flags.DEFINE_integer("image_height", 227, "Height of the output image after crop and resize.") #Alexnet takes 227 x 227 image input | |
tf.app.flags.DEFINE_integer("image_width", 227, "Width of the output image after crop and resize.") | |
FLAGS = tf.app.flags.FLAGS | |
""" The labels file contains a list of valid labels are held in this file. The file contains entries such as: | |
speed_100 | |
speed_120 | |
no_car_overtaking | |
no_truck_overtaking | |
Each line corresponds to a label, and each label (per line) is mapped to an integer corresponding to the line number starting from 0. | |
-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
# WRAPPER FOR INSERTING int64 FEATURES int64 FEATURES & BYTES FEATURES INTO EXAMPLES PROTO | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
def _int64_feature(value): | |
if not isinstance(value, list): | |
value = [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])) | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
#FUNCTION FOR BUILDING A PROTO | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
def _convert_to_example(filename, image_buffer, label, text, shape_buffer): | |
"""Build an Example proto for an example. | |
Args: | |
filename: string, path to an image file, e.g., '/path/to/example.JPG' | |
image_buffer: string, JPEG encoding of RGB image | |
label: integer, identifier for the ground truth for the network | |
text: string, unique human-readable, e.g. 'dog' | |
height: integer, image height in pixels | |
width: integer, image width in pixels | |
Returns: | |
Example proto | |
""" | |
colorspace = 'RGB' | |
channels = 3 | |
image_format = 'JPEG' | |
#Save TFrecord containing image_bytes, shape [337,337,3], label, text, filename | |
example = tf.train.Example(features=tf.train.Features(feature={ | |
'image/shape': _bytes_feature(shape_buffer), | |
'image/class/label': _int64_feature(label), | |
'image/class/text': _bytes_feature(tf.compat.as_bytes(text)), | |
'image/filename': _bytes_feature(tf.compat.as_bytes(os.path.basename(filename))), | |
'image/encoded': _bytes_feature(image_buffer)})) | |
return example | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
#CLASS WIH FUNCTIONS TO HELP ENCODE & DECODE IMAGES | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
class ImageCoder(object): | |
def __init__(self): | |
# Create a single Session to run all image coding calls. | |
self._sess = tf.Session() | |
# Initializes function that converts PNG to JPEG data. | |
self._png_data = tf.placeholder(dtype=tf.string) | |
image = tf.image.decode_png(self._png_data, channels=3) | |
self._png_to_jpeg = tf.image.encode_jpeg(image, format='rgb', quality=100) | |
# Initializes function that decodes RGB JPEG data. | |
self._decode_jpeg_data = tf.placeholder(dtype=tf.string) | |
self._decode_jpeg = tf.image.decode_jpeg(self._decode_jpeg_data, channels=3) | |
def png_to_jpeg(self, image_data): | |
return self._sess.run(self._png_to_jpeg, | |
feed_dict={self._png_data: image_data}) | |
def decode_jpeg(self, image_data): | |
image = self._sess.run(self._decode_jpeg, | |
feed_dict={self._decode_jpeg_data: image_data}) | |
assert len(image.shape) == 3 | |
assert image.shape[2] == 3 | |
return image | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
# PRE-PROCESS SINGLE IMAGE(Check if PNG, convert to JPEG, confirm conversion) | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
def _is_png(filename): | |
"""Determine if a file contains a PNG format image. | |
Args: | |
filename: string, path of the image file. | |
Returns: | |
boolean indicating if the image is a PNG. | |
""" | |
return '.png' in filename | |
def _process_image(filename, coder): | |
"""Process a single image file. | |
Args: | |
filename: string, path to an image file e.g., '/path/to/example.JPG'. | |
coder: instance of ImageCoder to provide TensorFlow image coding utils. | |
Returns: | |
image_buffer: string, JPEG encoding of RGB image. | |
height: integer, image height in pixels. | |
width: integer, image width in pixels. | |
""" | |
#Resize image to networks input size | |
size=(FLAGS.image_height, FLAGS.image_width) | |
original_image = Image.open(filename) | |
width, height = original_image.size | |
#print('The original image size is {wide} wide x {height} high'.format(wide=width, height=height)) | |
resized_image = original_image.resize(size) | |
width, height = resized_image.size | |
#print('The resized image size is {wide} wide x {height} high'.format(wide=width, height=height)) | |
resized_image.save(filename) | |
#Sleep a bit before file is re-read 5 milliseconds | |
sleep(0.005) | |
#ensure that all dataset images have been conveted to .jpeg | |
image = np.asarray(original_image, np.uint8) #get image data | |
shape = np.array(image.shape, np.int32) #get image shape | |
shape_data = shape.tobytes() #convert image shape to bytes | |
image_data = image.tobytes() # convert image to raw data bytes in the array. | |
""" ANOTHER METHOD | |
# Read the image file. | |
with tf.gfile.FastGFile(filename, 'rb') as f: | |
image_data = f.read() | |
# Convert any PNG to JPEG's for consistency. | |
if _is_png(filename): | |
print('Converting PNG to JPEG for %s' % filename) | |
image_data = coder.png_to_jpeg(image_data) | |
# Decode the RGB JPEG. | |
image = coder.decode_jpeg(image_data) | |
# Check that image converted to RGB | |
assert len(image.shape) == 3 | |
height = image.shape[0] | |
width = image.shape[1] | |
assert image.shape[2] == 3""" | |
return image_data, shape_data | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
# PROCESS BATCHES OF IMAGES AS AS EXAMPLE PROTO SAVED TO TFRecord PER SHARD | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
def _process_image_files_batch(coder, thread_index, ranges, name, filenames, | |
texts, labels, num_shards): | |
"""Processes and saves list of images as TFRecord in 1 thread. | |
Args: | |
coder: instance of ImageCoder to provide TensorFlow image coding utils. | |
thread_index: integer, unique batch to run index is within [0, len(ranges)). | |
ranges: list of pairs of integers specifying ranges of each batches to | |
analyze in parallel. | |
name: string, unique identifier specifying the data set | |
filenames: list of strings; each string is a path to an image file | |
texts: list of strings; each string is human readable, e.g. 'dog' | |
labels: list of integer; each integer identifies the ground truth | |
num_shards: integer number of shards for this data set. | |
""" | |
# Each thread produces N shards where N = int(num_shards / num_threads). | |
# For instance, if num_shards = 128, and the num_threads = 2, then the first | |
# thread would produce shards [0, 64). | |
num_threads = len(ranges) | |
assert not num_shards % num_threads | |
num_shards_per_batch = int(num_shards / num_threads) #Same as number of shards per thread | |
shard_ranges = np.linspace(ranges[thread_index][0], | |
ranges[thread_index][1], | |
num_shards_per_batch + 1).astype(int) | |
num_files_in_thread = ranges[thread_index][1] - ranges[thread_index][0] | |
counter = 0 | |
for s in range(num_shards_per_batch): | |
# Generate a sharded version of the file name, e.g. 'train-00002-of-00010' | |
shard = thread_index * num_shards_per_batch + s | |
output_filename = '%s-%.5d-of-%.5d' % (name, shard, num_shards) | |
output_file = os.path.join(FLAGS.output_directory, output_filename) | |
writer = tf.python_io.TFRecordWriter(output_file) | |
shard_counter = 0 | |
files_in_shard = np.arange(shard_ranges[s], shard_ranges[s + 1], dtype=int) | |
for i in files_in_shard: | |
filename = filenames[i] | |
label = labels[i] | |
text = texts[i] | |
try: | |
# image_buffer, height, width = _process_image(filename, coder) | |
image_buffer, shape_buffer = _process_image(filename, coder) | |
except Exception as e: | |
print(e) | |
print('SKIPPED: Unexpected eror while decoding %s.' % filename) | |
continue | |
example = _convert_to_example(filename, image_buffer, label, | |
text, shape_buffer) | |
writer.write(example.SerializeToString()) | |
shard_counter += 1 | |
counter += 1 | |
if not counter % 1000: | |
print('%s [thread %d]: Processed %d of %d images in thread batch.' % | |
(datetime.now(), thread_index, counter, num_files_in_thread)) | |
sys.stdout.flush() | |
writer.close() | |
print('%s [thread %d]: Wrote %d images to %s' % | |
(datetime.now(), thread_index, shard_counter, output_file)) | |
sys.stdout.flush() | |
shard_counter = 0 | |
print('%s [thread %d]: Wrote %d images to %d shards.' % | |
(datetime.now(), thread_index, counter, num_files_in_thread)) | |
sys.stdout.flush() | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
# PROCESS AND SAVES LIST OF IMAGES AS TFRecord OF EXAMPLE PROTOS (Entire Dataset details sent here) | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
def _process_image_files(name, filenames, texts, labels, num_shards): | |
"""Process and save list of images as TFRecord of Example protos. | |
Args: | |
name: string, unique identifier specifying the data set | |
filenames: list of strings; each string is a path to an image file | |
texts: list of strings; each string is human readable, e.g. 'dog' | |
labels: list of integer; each integer identifies the ground truth | |
num_shards: integer number of shards for this data set. | |
""" | |
assert len(filenames) == len(texts) | |
assert len(filenames) == len(labels) | |
# Break all images into batches with a [ranges[i][0], ranges[i][1]]. | |
spacing = np.linspace(0, len(filenames), FLAGS.num_threads + 1).astype(np.int) | |
ranges = [] | |
for i in range(len(spacing) - 1): | |
ranges.append([spacing[i], spacing[i + 1]]) | |
# Launch a thread for each batch. | |
print('Launching %d threads for spacings: %s' % (FLAGS.num_threads, ranges)) | |
sys.stdout.flush() | |
# Create a mechanism for monitoring when all threads are finished. | |
coord = tf.train.Coordinator() | |
# Create a generic TensorFlow-based utility for converting all image codings. | |
coder = ImageCoder() | |
threads = [] | |
for thread_index in range(len(ranges)): | |
args = (coder, thread_index, ranges, name, filenames, | |
texts, labels, num_shards) | |
#From the entire data set details sent to _process_image_files, convert then to proto examples in batches (per no of threads set) and save as TFRecord | |
t = threading.Thread(target=_process_image_files_batch, args=args) | |
t.start() | |
threads.append(t) | |
# Wait for all the threads to terminate. | |
coord.join(threads) | |
print('%s: Finished writing all %d images in data set.' % | |
(datetime.now(), len(filenames))) | |
sys.stdout.flush() | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
#BUILD LIST OF ALL IMAGES FILES AND LABELS IN THE DATA SET | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
def _find_image_files(data_dir, labels_file): | |
""" | |
Args: | |
data_dir: string, path to the root directory of images. | |
Assumes that the image data set resides in JPEG files located in | |
the following directory structure. | |
data_dir/dog/another-image.JPEG | |
data_dir/dog/my-image.jpg | |
where 'dog' is the label associated with these images. | |
labels_file: string, path to the labels file. | |
The list of valid labels are held in this file. Assumes that the file | |
contains entries as such: | |
dog | |
cat | |
flower | |
where each line corresponds to a label. We map each label contained in | |
the file to an integer starting with the integer 0 corresponding to the | |
label contained in the first line. | |
Returns: | |
filenames: list of strings; each string is a path to an image file. | |
texts: list of strings; each string is the class, e.g. 'dog' | |
labels: list of integer; each integer identifies the ground truth. | |
""" | |
print('Determining list of input files and labels from %s ' % labels_file) | |
unique_labels = [l.strip() for l in tf.gfile.FastGFile( | |
labels_file, 'r').readlines()] | |
labels = [] | |
filenames = [] | |
texts = [] | |
# Leave label index 0 empty as a background class. | |
label_index = 1 | |
# Construct the list of JPEG files and labels. | |
for text in unique_labels: | |
jpeg_file_path = '%s/%s/*' % (data_dir, text) | |
print("File path %s \n" % jpeg_file_path); | |
matching_files = tf.gfile.Glob(jpeg_file_path) | |
labels.extend([label_index] * len(matching_files)) | |
texts.extend([text] * len(matching_files)) | |
filenames.extend(matching_files) | |
if not label_index % 100: | |
print('Finished finding files in %d of %d classes.' % ( | |
label_index, len(labels))) | |
label_index += 1 | |
# Shuffle the ordering of all image files in order to guarantee | |
# random ordering of the images with respect to label in the | |
# saved TFRecord files. Make the randomization repeatable. | |
shuffled_index = list(range(len(filenames))) | |
random.seed(12345) | |
random.shuffle(shuffled_index) | |
filenames = [filenames[i] for i in shuffled_index] | |
texts = [texts[i] for i in shuffled_index] | |
labels = [labels[i] for i in shuffled_index] | |
print('Found %d JPEG files across %d labels inside %s' % | |
(len(filenames), len(unique_labels), data_dir)) | |
return filenames, texts, labels | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
#CALL TO PROCESS DATASET IS MADE HERE | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
def _process_dataset(name, directory, num_shards, labels_file): | |
"""Process a complete data set and save it as a TFRecord. | |
Args: | |
name: string, unique identifier specifying the data set. | |
directory: string, root path to the data set. | |
num_shards: integer number of shards for this data set. | |
labels_file: string, path to the labels file. | |
""" | |
filenames, texts, labels = _find_image_files(directory, labels_file) #Build list of dataset image file (path to them) and their labels as string and integer | |
_process_image_files(name, filenames, texts, labels, num_shards) #Process the entire list of images in the dataset into a TF record | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
#MAIN | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" | |
def main(unused_argv): | |
assert not FLAGS.train_shards % FLAGS.num_threads, ('Please make the FLAGS.num_threads commensurate with FLAGS.train_shards') | |
assert not FLAGS.validation_shards % FLAGS.num_threads, ('Please make the FLAGS.num_threads commensurate with ''FLAGS.validation_shards') | |
print('Result will be saved to %s' % FLAGS.output_directory) | |
# Run it! | |
_process_dataset('validation', FLAGS.validation_directory, FLAGS.validation_shards, FLAGS.labels_file) | |
_process_dataset('train', FLAGS.train_directory, FLAGS.train_shards, FLAGS.labels_file) | |
if __name__ == '__main__': | |
tf.app.run() | |
"""-------------------------------------------------------------------------------------------------------------------------------------------------------""" |
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