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utils.py
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utils.py
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import os
import scipy
import numpy as np
import tensorflow as tf
def load_mnist(batch_size, is_training=True):
path = os.path.join('data', 'mnist')
if is_training:
fd = open(os.path.join(path, 'train-images-idx3-ubyte'))
loaded = np.fromfile(file=fd, dtype=np.uint8)
trainX = loaded[16:].reshape((60000, 28, 28, 1)).astype(np.float32)
fd = open(os.path.join(path, 'train-labels-idx1-ubyte'))
loaded = np.fromfile(file=fd, dtype=np.uint8)
trainY = loaded[8:].reshape((60000)).astype(np.int32)
trX = trainX[:55000] / 255.
trY = trainY[:55000]
valX = trainX[55000:, ] / 255.
valY = trainY[55000:]
num_tr_batch = 55000 // batch_size
num_val_batch = 5000 // batch_size
return trX, trY, num_tr_batch, valX, valY, num_val_batch
else:
fd = open(os.path.join(path, 't10k-images-idx3-ubyte'))
loaded = np.fromfile(file=fd, dtype=np.uint8)
teX = loaded[16:].reshape((10000, 28, 28, 1)).astype(np.float)
fd = open(os.path.join(path, 't10k-labels-idx1-ubyte'))
loaded = np.fromfile(file=fd, dtype=np.uint8)
teY = loaded[8:].reshape((10000)).astype(np.int32)
num_te_batch = 10000 // batch_size
return teX / 255., teY, num_te_batch
def load_fashion_mnist(batch_size, is_training=True):
path = os.path.join('data', 'fashion-mnist')
if is_training:
fd = open(os.path.join(path, 'train-images-idx3-ubyte'))
loaded = np.fromfile(file=fd, dtype=np.uint8)
trainX = loaded[16:].reshape((60000, 28, 28, 1)).astype(np.float32)
fd = open(os.path.join(path, 'train-labels-idx1-ubyte'))
loaded = np.fromfile(file=fd, dtype=np.uint8)
trainY = loaded[8:].reshape((60000)).astype(np.int32)
trX = trainX[:55000] / 255.
trY = trainY[:55000]
valX = trainX[55000:, ] / 255.
valY = trainY[55000:]
num_tr_batch = 55000 // batch_size
num_val_batch = 5000 // batch_size
return trX, trY, num_tr_batch, valX, valY, num_val_batch
else:
fd = open(os.path.join(path, 't10k-images-idx3-ubyte'))
loaded = np.fromfile(file=fd, dtype=np.uint8)
teX = loaded[16:].reshape((10000, 28, 28, 1)).astype(np.float)
fd = open(os.path.join(path, 't10k-labels-idx1-ubyte'))
loaded = np.fromfile(file=fd, dtype=np.uint8)
teY = loaded[8:].reshape((10000)).astype(np.int32)
num_te_batch = 10000 // batch_size
return teX / 255., teY, num_te_batch
def load_data(dataset, batch_size, is_training=True, one_hot=False):
if dataset == 'mnist':
return load_mnist(batch_size, is_training)
elif dataset == 'fashion-mnist':
return load_fashion_mnist(batch_size, is_training)
else:
raise Exception('Invalid dataset, please check the name of dataset:', dataset)
def get_batch_data(dataset, batch_size, num_threads):
if dataset == 'mnist':
trX, trY, num_tr_batch, valX, valY, num_val_batch = load_mnist(batch_size, is_training=True)
elif dataset == 'fashion-mnist':
trX, trY, num_tr_batch, valX, valY, num_val_batch = load_fashion_mnist(batch_size, is_training=True)
data_queues = tf.train.slice_input_producer([trX, trY])
X, Y = tf.train.shuffle_batch(data_queues, num_threads=num_threads,
batch_size=batch_size,
capacity=batch_size * 64,
min_after_dequeue=batch_size * 32,
allow_smaller_final_batch=False)
return(X, Y)
def save_images(imgs, size, path):
'''
Args:
imgs: [batch_size, image_height, image_width]
size: a list with tow int elements, [image_height, image_width]
path: the path to save images
'''
imgs = (imgs + 1.) / 2 # inverse_transform
return(scipy.misc.imsave(path, mergeImgs(imgs, size)))
def mergeImgs(images, size):
h, w = images.shape[1], images.shape[2]
imgs = np.zeros((h * size[0], w * size[1], 3))
for idx, image in enumerate(images):
i = idx % size[1]
j = idx // size[1]
imgs[j * h:j * h + h, i * w:i * w + w, :] = image
return imgs