基于MINIST数据集训练辅助分类器ACGAN（生成对抗网络）
运行生成文件
效果展示
plot_epoch_073_generated（图片文件）
代码注释
# -*- coding: utf-8 -*-
"""
Train an Auxiliary Classifier Generative Adversarial Network (ACGAN) on the
MNIST dataset. See https://arxiv.org/abs/1610.09585 for more details.
基于MINIST数据集训练辅助分类器ACGAN（生成对抗网络）
详情见：https://arxiv.org/abs/1610.09585
You should start to see reasonable images after ~5 epochs, and good images
by ~15 epochs. You should use a GPU, as the convolution-heavy operations are
very slow on the CPU. Prefer the TensorFlow backend if you plan on iterating,
as the compilation time can be a blocker using Theano.
5周期后，开始看到合理的图像，大约15周期后，看到合理的图像。
应该使用GPU，因为卷积运算在CPU上的速度非常慢。如果计划迭代，则首选TensorFlow后端，
因为使用Theano编译时速度慢。
Timings:
Hardware | Backend | Time / Epoch
-------------------------------------------
CPU | TF | 3 hrs
Titan X (maxwell) | TF | 4 min
Titan X (maxwell) | TH | 7 min
Consult https://github.com/lukedeo/keras-acgan for more information and
example output
更多信息和示例输出，请参阅https://github.com/lukedeo/keras-acgan
"""
from __future__ import print_function
from collections import defaultdict
try:
import cPickle as pickle
except ImportError:
import pickle
from PIL import Image
from six.moves import range
from keras.datasets import mnist
from keras import layers
from keras.layers import Input, Dense, Reshape, Flatten, Embedding, Dropout
from keras.layers import BatchNormalization
from keras.layers.advanced_activations import LeakyReLU
from keras.layers.convolutional import Conv2DTranspose, Conv2D
from keras.models import Sequential, Model
from keras.optimizers import Adam
from keras.utils.generic_utils import Progbar
import numpy as np
np.random.seed(1337)
num_classes = 10
def build_generator(latent_size):
# we will map a pair of (z, L), where z is a latent vector and L is a
# label drawn from P_c, to image space (..., 28, 28, 1)
#映射一对(z, L)，其中z是一个隐矢，L是P_c绘制的标签。，到图像空间（…，28, 28, 1）
cnn = Sequential()
cnn.add(Dense(3 * 3 * 384, input_dim=latent_size, activation='relu'))
cnn.add(Reshape((3, 3, 384)))
# upsample to (7, 7, ...)
# 上采样到（7, 7，…）
cnn.add(Conv2DTranspose(192, 5, strides=1, padding='valid',
activation='relu',
kernel_initializer='glorot_normal'))
cnn.add(BatchNormalization())
# upsample to (14, 14, ...)
# 上采样到(14, 14, ...)
cnn.add(Conv2DTranspose(96, 5, strides=2, padding='same',
activation='relu',
kernel_initializer='glorot_normal'))
cnn.add(BatchNormalization())
# upsample to (28, 28, ...)
# 上采样到(28, 28, ...)
cnn.add(Conv2DTranspose(1, 5, strides=2, padding='same',
activation='tanh',
kernel_initializer='glorot_normal'))
# this is the z space commonly referred to in GAN papers
# GAN文献中常用的Z空间。
latent = Input(shape=(latent_size, ))
# this will be our label
# 标签
image_class = Input(shape=(1,), dtype='int32')
cls = Flatten()(Embedding(num_classes, latent_size,
embeddings_initializer='glorot_normal')(image_class))
# hadamard product between z-space and a class conditional embedding
# z-space与条件嵌入的Hadamard积
h = layers.multiply([latent, cls])
fake_image = cnn(h)
return Model([latent, image_class], fake_image)
def build_discriminator():
# build a relatively standard conv net, with LeakyReLUs as suggested in
# the reference paper
# 根据论文，建立一个相对标准的conv网络（卷积网络）
cnn = Sequential()
cnn.add(Conv2D(32, 3, padding='same', strides=2,
input_shape=(28, 28, 1)))
cnn.add(LeakyReLU(0.2))
cnn.add(Dropout(0.3))
cnn.add(Conv2D(64, 3, padding='same', strides=1))
cnn.add(LeakyReLU(0.2))
cnn.add(Dropout(0.3))
cnn.add(Conv2D(128, 3, padding='same', strides=2))
cnn.add(LeakyReLU(0.2))
cnn.add(Dropout(0.3))
cnn.add(Conv2D(256, 3, padding='same', strides=1))
cnn.add(LeakyReLU(0.2))
cnn.add(Dropout(0.3))
cnn.add(Flatten())
image = Input(shape=(28, 28, 1))
features = cnn(image)
# first output (name=generation) is whether or not the discriminator
# thinks the image that is being shown is fake, and the second output
# (name=auxiliary) is the class that the discriminator thinks the image
# belongs to.
# 第一输出（name=generation）是鉴别器是否认为所显示的图像是假的，而第二输出（名称＝辅助）是鉴别器认为图像属于的类。
fake = Dense(1, activation='sigmoid', name='generation')(features)
aux = Dense(num_classes, activation='softmax', name='auxiliary')(features)
return Model(image, [fake, aux])
if __name__ == '__main__':
# batch and latent size taken from the paper
# 来自论文的批次和尺寸
epochs = 100
batch_size = 100
latent_size = 100
# Adam parameters suggested in https://arxiv.org/abs/1511.06434
# Adm参数详见：https://arxiv.org/abs/1511.06434
adam_lr = 0.0002
adam_beta_1 = 0.5
# build the discriminator
# 创建判别器
print('Discriminator model:')
discriminator = build_discriminator()
discriminator.compile(
optimizer=Adam(lr=adam_lr, beta_1=adam_beta_1),
loss=['binary_crossentropy', 'sparse_categorical_crossentropy']
)
discriminator.summary()
# build the generator
# 创建生成器
generator = build_generator(latent_size)
latent = Input(shape=(latent_size, ))
image_class = Input(shape=(1,), dtype='int32')
# get a fake image
# 获取赝品图片
fake = generator([latent, image_class])
# we only want to be able to train generation for the combined model
# 为组合模型训练生成器。
discriminator.trainable = False
fake, aux = discriminator(fake)
combined = Model([latent, image_class], [fake, aux])
print('Combined model:')
combined.compile(
optimizer=Adam(lr=adam_lr, beta_1=adam_beta_1),
loss=['binary_crossentropy', 'sparse_categorical_crossentropy']
)
combined.summary()
# get our mnist data, and force it to be of shape (..., 28, 28, 1) with
# range [-1, 1]
# 获取MNIST数据集，并强制调整它的形状为（…，28, 28, 1）。取值范围[-1, 1]
(x_train, y_train), (x_test, y_test) = mnist.load_data()
x_train = (x_train.astype(np.float32) - 127.5) / 127.5 # 图像像素取值范围[0,255]，以其1/2作为基准
x_train = np.expand_dims(x_train, axis=-1)
x_test = (x_test.astype(np.float32) - 127.5) / 127.5
x_test = np.expand_dims(x_test, axis=-1)
num_train, num_test = x_train.shape[0], x_test.shape[0]
train_history = defaultdict(list)
test_history = defaultdict(list)
for epoch in range(1, epochs + 1):
print('Epoch {}/{}'.format(epoch, epochs))
num_batches = int(x_train.shape[0] / batch_size)
progress_bar = Progbar(target=num_batches)
# we don't want the discriminator to also maximize the classification
# accuracy of the auxiliary classifier on generated images, so we
# don't train discriminator to produce class labels for generated
# images (see https://openreview.net/forum?id=rJXTf9Bxg).
# 我们不希望鉴别器也最大化辅助分类器在生成图像上的分类精度，所以我们不训练鉴别器来产生生成图像的类标签
# （详见：https://openreview.net/forum?id=rJXTf9Bxg）
# To preserve sum of sample weights for the auxiliary classifier,
# we assign sample weight of 2 to the real images.
# 为了保持辅助分类器的样本权重之和，分配2个相同的实际图像的样本权重。
disc_sample_weight = [np.ones(2 * batch_size),
np.concatenate((np.ones(batch_size) * 2,
np.zeros(batch_size)))]
epoch_gen_loss = []
epoch_disc_loss = []
for index in range(num_batches):
# generate a new batch of noise
# 产生新一批噪声
noise = np.random.uniform(-1, 1, (batch_size, latent_size))
# get a batch of real images
# 获取一批真实图像
image_batch = x_train[index * batch_size:(index + 1) * batch_size]
label_batch = y_train[index * batch_size:(index + 1) * batch_size]
# sample some labels from p_c
# 从p_c取样标签
sampled_labels = np.random.randint(0, num_classes, batch_size)
# generate a batch of fake images, using the generated labels as a
# conditioner. We reshape the sampled labels to be
# (batch_size, 1) so that we can feed them into the embedding
# layer as a length one sequence
# 生成一批假图像，使用生成的标签作为调节器。我们将采样标签整形为（batch_size, 1），
# 这样我们就可以把它们作为长度一个序列输入到嵌入层中。
generated_images = generator.predict(
[noise, sampled_labels.reshape((-1, 1))], verbose=0)
x = np.concatenate((image_batch, generated_images))
# use one-sided soft real/fake labels
# 使用单面软真/假标签
# Salimans et al., 2016
# https://arxiv.org/pdf/1606.03498.pdf (Section 3.4)
soft_zero, soft_one = 0, 0.95
y = np.array([soft_one] * batch_size + [soft_zero] * batch_size)
aux_y = np.concatenate((label_batch, sampled_labels), axis=0)
# see if the discriminator can figure itself out...
# 看看鉴别器是否能算出它自己…
epoch_disc_loss.append(discriminator.train_on_batch(
x, [y, aux_y], sample_weight=disc_sample_weight))
# make new noise. we generate 2 * batch size here such that we have
# the generator optimize over an identical number of images as the
# discriminator
# 制造新的噪音。产生 * batch大小在这里，这样我们有生成器优化在相同数量的图像作为鉴别器
noise = np.random.uniform(-1, 1, (2 * batch_size, latent_size))
sampled_labels = np.random.randint(0, num_classes, 2 * batch_size)
# we want to train the generator to trick the discriminator
# For the generator, we want all the {fake, not-fake} labels to say
# not-fake
# 训练生成器来欺骗鉴别器，希望鉴别器对所有的{假，不假}标签都说不是假的。
trick = np.ones(2 * batch_size) * soft_one
epoch_gen_loss.append(combined.train_on_batch(
[noise, sampled_labels.reshape((-1, 1))],
[trick, sampled_labels]))
progress_bar.update(index + 1)
print('Testing for epoch {}:'.format(epoch))
# evaluate the testing loss here
# 评估测试损失
# generate a new batch of noise
# 产生新一批噪声
noise = np.random.uniform(-1, 1, (num_test, latent_size))
# sample some labels from p_c and generate images from them
# 从p_c中采样一些标签并根据标签生成图像
sampled_labels = np.random.randint(0, num_classes, num_test)
generated_images = generator.predict(
[noise, sampled_labels.reshape((-1, 1))], verbose=False)
x = np.concatenate((x_test, generated_images))
y = np.array([1] * num_test + [0] * num_test)
aux_y = np.concatenate((y_test, sampled_labels), axis=0)
# see if the discriminator can figure itself out...
# 看看鉴别器是否能算出…
discriminator_test_loss = discriminator.evaluate(
x, [y, aux_y], verbose=False)
discriminator_train_loss = np.mean(np.array(epoch_disc_loss), axis=0)
# make new noise
# 制造新噪音
noise = np.random.uniform(-1, 1, (2 * num_test, latent_size))
sampled_labels = np.random.randint(0, num_classes, 2 * num_test)
trick = np.ones(2 * num_test)
generator_test_loss = combined.evaluate(
[noise, sampled_labels.reshape((-1, 1))],
[trick, sampled_labels], verbose=False)
generator_train_loss = np.mean(np.array(epoch_gen_loss), axis=0)
# generate an epoch report on performance
# 生成有关性能的周期性报告
train_history['generator'].append(generator_train_loss)
train_history['discriminator'].append(discriminator_train_loss)
test_history['generator'].append(generator_test_loss)
test_history['discriminator'].append(discriminator_test_loss)
print('{0:<22s} | {1:4s} | {2:15s} | {3:5s}'.format(
'component', *discriminator.metrics_names))
print('-' * 65)
ROW_FMT = '{0:<22s} | {1:<4.2f} | {2:<15.4f} | {3:<5.4f}'
print(ROW_FMT.format('generator (train)',
*train_history['generator'][-1]))
print(ROW_FMT.format('generator (test)',
*test_history['generator'][-1]))
print(ROW_FMT.format('discriminator (train)',
*train_history['discriminator'][-1]))
print(ROW_FMT.format('discriminator (test)',
*test_history['discriminator'][-1]))
# save weights every epoch
# 保存每个周期的权重
generator.save_weights(
'params_generator_epoch_{0:03d}.hdf5'.format(epoch), True)
discriminator.save_weights(
'params_discriminator_epoch_{0:03d}.hdf5'.format(epoch), True)
# generate some digits to display
# 生成一些数字显示
num_rows = 40
noise = np.tile(np.random.uniform(-1, 1, (num_rows, latent_size)),
(num_classes, 1))
sampled_labels = np.array([
[i] * num_rows for i in range(num_classes)
]).reshape(-1, 1)
# get a batch to display
# 获得批量显示
generated_images = generator.predict(
[noise, sampled_labels], verbose=0)
# prepare real images sorted by class label
# 准备按类标签排序的真实图像
real_labels = y_train[(epoch - 1) * num_rows * num_classes:
epoch * num_rows * num_classes]
indices = np.argsort(real_labels, axis=0)
real_images = x_train[(epoch - 1) * num_rows * num_classes:
epoch * num_rows * num_classes][indices]
# display generated images, white separator, real images
# 显示生成的图像，白色分离器，真实图像
img = np.concatenate(
(generated_images,
np.repeat(np.ones_like(x_train[:1]), num_rows, axis=0),
real_images))
# arrange them into a grid
# 将它们排列成网格
img = (np.concatenate([r.reshape(-1, 28)
for r in np.split(img, 2 * num_classes + 1)
], axis=-1) * 127.5 + 127.5).astype(np.uint8)
Image.fromarray(img).save(
'plot_epoch_{0:03d}_generated.png'.format(epoch))
with open('acgan-history.pkl', 'wb') as f:
pickle.dump({'train': train_history, 'test': test_history}, f)代码执行
C:\ProgramData\Anaconda3\python.exe E:/keras-master/examples/mnist_acgan.py
Using TensorFlow backend.
Discriminator model:
__________________________________________________________________________________________________
Layer (type) Output Shape Param # Connected to
==================================================================================================
input_1 (InputLayer) (None, 28, 28, 1) 0
__________________________________________________________________________________________________
sequential_1 (Sequential) (None, 12544) 387840 input_1[0][0]
__________________________________________________________________________________________________
generation (Dense) (None, 1) 12545 sequential_1[1][0]
__________________________________________________________________________________________________
auxiliary (Dense) (None, 10) 125450 sequential_1[1][0]
==================================================================================================
Total params: 525,835
Trainable params: 525,835
Non-trainable params: 0
__________________________________________________________________________________________________
Combined model:
__________________________________________________________________________________________________
Layer (type) Output Shape Param # Connected to
==================================================================================================
input_4 (InputLayer) (None, 100) 0
__________________________________________________________________________________________________
input_5 (InputLayer) (None, 1) 0
__________________________________________________________________________________________________
model_2 (Model) (None, 28, 28, 1) 2657897 input_4[0][0]
input_5[0][0]
__________________________________________________________________________________________________
model_1 (Model) [(None, 1), (None, 1 525835 model_2[1][0]
==================================================================================================
Total params: 3,183,732
Trainable params: 2,657,321
Non-trainable params: 526,411
__________________________________________________________________________________________________
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600/600 [==============================] - 135s 225ms/step
Testing for epoch 1:
component | loss | generation_loss | auxiliary_loss
-----------------------------------------------------------------
generator (train) | 1.40 | 0.9750 | 0.4249
generator (test) | 1.18 | 1.1657 | 0.0161
discriminator (train) | 1.55 | 0.6922 | 0.8536
discriminator (test) | 0.59 | 0.4920 | 0.0960
Epoch 2/100
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Testing for epoch 100:
component | loss | generation_loss | auxiliary_loss
-----------------------------------------------------------------
generator (train) | 0.76 | 0.7628 | 0.0005
generator (test) | 0.82 | 0.8151 | 0.0000
discriminator (train) | 0.71 | 0.6932 | 0.0145
discriminator (test) | 0.70 | 0.6942 | 0.0106
Process finished with exit code 0Keras详细介绍
中文：http://keras-cn.readthedocs.io/en/latest/
实例下载
https://github.com/keras-team/keras
https://github.com/keras-team/keras/tree/master/examples
完整项目下载
方便没积分童鞋，请加企鹅452205574，共享文件夹。
包括：代码、数据集合（图片）、已生成model、安装库文件等。
