class AvatarModel: def __init__(self): self.avatar = Avatar() # 真实图片shape (height, width, depth) self.img_shape = self.avatar.img_shape # 一个batch的图片向量shape (batch, height, width, depth) self.batch_shape = self.avatar.batch_shape # 一个batch包含图片数量 self.batch_size = self.avatar.batch_size # batch数量 self.chunk_size = self.avatar.chunk_size # 噪音图片size self.noise_img_size = 100 # 卷积转置输出通道数量 self.gf_size = 64 # 卷积输出通道数量 self.df_size = 64 # 训练循环次数 self.epoch_size = 150 # 学习率 self.learning_rate = 0.0002 # 优化指数衰减率 self.beta1 = 0.5 # 生成图片数量 self.sample_size = 64 @staticmethod def conv_out_size_same(size, stride): return int(math.ceil(float(size) / float(stride))) @staticmethod def linear(images, output_size, stddev=0.02, bias_start=0.0, name='Linear'): shape = images.get_shape().as_list() with tf.variable_scope(name): w = tf.get_variable("w", [shape[1], output_size], tf.float32, tf.random_normal_initializer(stddev=stddev)) b = tf.get_variable( "b", [output_size], initializer=tf.constant_initializer(bias_start)) return tf.matmul(images, w) + b, w, b @staticmethod def batch_normalizer(x, epsilon=1e-5, momentum=0.9, train=True, name='batch_norm'): with tf.variable_scope(name): return tf.contrib.layers.batch_norm(x, decay=momentum, updates_collections=None, epsilon=epsilon, scale=True, is_training=train) @staticmethod def conv2d(images, output_dim, stddev=0.02, name="conv2d"): with tf.variable_scope(name): # filter : [height, width, in_channels, output_channels] # 注意与转置卷积的不同 filter_shape = [5, 5, images.get_shape()[-1], output_dim] # strides # 对应每一维的filter移动步长 strides_shape = [1, 2, 2, 1] w = tf.get_variable( 'w', filter_shape, initializer=tf.truncated_normal_initializer(stddev=stddev)) b = tf.get_variable('b', [output_dim], initializer=tf.constant_initializer(0.0)) conv = tf.nn.conv2d(images, w, strides=strides_shape, padding='SAME') conv = tf.reshape(tf.nn.bias_add(conv, b), conv.get_shape()) return conv @staticmethod def deconv2d(images, output_shape, stddev=0.02, name='deconv2d'): with tf.variable_scope(name): # filter : [height, width, output_channels, in_channels] # 注意与卷积的不同 filter_shape = [5, 5, output_shape[-1], images.get_shape()[-1]] # strides # 对应每一维的filter移动步长 strides_shape = [1, 2, 2, 1] w = tf.get_variable( 'w', filter_shape, initializer=tf.random_normal_initializer(stddev=stddev)) b = tf.get_variable('biases', [output_shape[-1]], initializer=tf.constant_initializer(0.0)) deconv = tf.nn.conv2d_transpose(images, w, output_shape=output_shape, strides=strides_shape) deconv = tf.nn.bias_add(deconv, b) return deconv, w, b @staticmethod def lrelu(x, leak=0.2): return tf.maximum(x, leak * x) def generator(self, noise_imgs, train=True, reuse=False): with tf.variable_scope('generator', reuse=reuse): # 分别对应每个layer的height, width s_h, s_w, _ = self.img_shape s_h2, s_w2 = self.conv_out_size_same(s_h, 2), self.conv_out_size_same( s_w, 2) s_h4, s_w4 = self.conv_out_size_same(s_h2, 2), self.conv_out_size_same( s_w2, 2) s_h8, s_w8 = self.conv_out_size_same(s_h4, 2), self.conv_out_size_same( s_w4, 2) s_h16, s_w16 = self.conv_out_size_same(s_h8, 2), self.conv_out_size_same( s_w8, 2) # layer 0 # 对输入噪音图片进行线性变换 z, h0_w, h0_b = self.linear(noise_imgs, self.gf_size * 8 * s_h16 * s_w16) # reshape为合适的输入层格式 h0 = tf.reshape(z, [-1, s_h16, s_w16, self.gf_size * 8]) # 对数据进行归一化处理 加快收敛速度 h0 = self.batch_normalizer(h0, train=train, name='g_bn0') # 激活函数 h0 = tf.nn.relu(h0) # layer 1 # 卷积转置进行上采样 h1, h1_w, h1_b = self.deconv2d( h0, [self.batch_size, s_h8, s_w8, self.gf_size * 4], name='g_h1') h1 = self.batch_normalizer(h1, train=train, name='g_bn1') h1 = tf.nn.relu(h1) # layer 2 h2, h2_w, h2_b = self.deconv2d( h1, [self.batch_size, s_h4, s_w4, self.gf_size * 2], name='g_h2') h2 = self.batch_normalizer(h2, train=train, name='g_bn2') h2 = tf.nn.relu(h2) # layer 3 h3, h3_w, h3_b = self.deconv2d( h2, [self.batch_size, s_h2, s_w2, self.gf_size * 1], name='g_h3') h3 = self.batch_normalizer(h3, train=train, name='g_bn3') h3 = tf.nn.relu(h3) # layer 4 h4, h4_w, h4_b = self.deconv2d(h3, self.batch_shape, name='g_h4') return tf.nn.tanh(h4) def discriminator(self, real_imgs, reuse=False): with tf.variable_scope("discriminator", reuse=reuse): # layer 0 # 卷积操作 h0 = self.conv2d(real_imgs, self.df_size, name='d_h0_conv') # 激活函数 h0 = self.lrelu(h0) # layer 1 h1 = self.conv2d(h0, self.df_size * 2, name='d_h1_conv') h1 = self.batch_normalizer(h1, name='d_bn1') h1 = self.lrelu(h1) # layer 2 h2 = self.conv2d(h1, self.df_size * 4, name='d_h2_conv') h2 = self.batch_normalizer(h2, name='d_bn2') h2 = self.lrelu(h2) # layer 3 h3 = self.conv2d(h2, self.df_size * 8, name='d_h3_conv') h3 = self.batch_normalizer(h3, name='d_bn3') h3 = self.lrelu(h3) # layer 4 h4, _, _ = self.linear(tf.reshape(h3, [self.batch_size, -1]), 1, name='d_h4_lin') return tf.nn.sigmoid(h4), h4 @staticmethod def loss_graph(real_logits, fake_logits): # 生成器图片loss # 生成器希望判别器判断出来的标签为1 gen_loss = tf.reduce_mean( tf.nn.sigmoid_cross_entropy_with_logits( logits=fake_logits, labels=tf.ones_like(fake_logits))) # 判别器识别生成器图片loss # 判别器希望识别出来的标签为0 fake_loss = tf.reduce_mean( tf.nn.sigmoid_cross_entropy_with_logits( logits=fake_logits, labels=tf.zeros_like(fake_logits))) # 判别器识别真实图片loss # 判别器希望识别出来的标签为1 real_loss = tf.reduce_mean( tf.nn.sigmoid_cross_entropy_with_logits( logits=real_logits, labels=tf.ones_like(real_logits))) # 判别器总loss dis_loss = tf.add(fake_loss, real_loss) return gen_loss, fake_loss, real_loss, dis_loss @staticmethod def optimizer_graph(gen_loss, dis_loss, learning_rate, beta1): # 所有定义变量 train_vars = tf.trainable_variables() # 生成器变量 gen_vars = [ var for var in train_vars if var.name.startswith('generator') ] # 判别器变量 dis_vars = [ var for var in train_vars if var.name.startswith('discriminator') ] # optimizer # 生成器与判别器作为两个网络需要分别优化 gen_optimizer = tf.train.AdamOptimizer(learning_rate=learning_rate, beta1=beta1).minimize( gen_loss, var_list=gen_vars) dis_optimizer = tf.train.AdamOptimizer(learning_rate=learning_rate, beta1=beta1).minimize( dis_loss, var_list=dis_vars) return gen_optimizer, dis_optimizer def gen(self, epoch): # 生成图片 # tf.reset_default_graph() noise_imgs = tf.placeholder(tf.float32, [None, self.noise_img_size], name='noise_imgs') sample_imgs = self.generator(noise_imgs, train=False, reuse=True) saver = tf.train.Saver() with tf.Session() as sess: sess.run(tf.global_variables_initializer()) saver.restore(sess, tf.train.latest_checkpoint('.')) sample_noise = np.random.uniform(-1, 1, size=(self.sample_size, self.noise_img_size)) samples = sess.run(sample_imgs, feed_dict={noise_imgs: sample_noise}) for num in range(len(samples)): self.avatar.save_img( samples[num], 'samples' + os.sep + str(num) + "epoch" + str(epoch) + '.jpg') def train(self): tf.reset_default_graph() # 真实图片 real_imgs = tf.placeholder(tf.float32, self.batch_shape, name='real_images') # 噪声图片 noise_imgs = tf.placeholder(tf.float32, [None, self.noise_img_size], name='noise_images') # 生成器图片 fake_imgs = self.generator(noise_imgs) # 判别器 real_outputs, real_logits = self.discriminator(real_imgs) fake_outputs, fake_logits = self.discriminator(fake_imgs, reuse=True) # 损失 gen_loss, fake_loss, real_loss, dis_loss = self.loss_graph( real_logits, fake_logits) # 优化 gen_optimizer, dis_optimizer = self.optimizer_graph( gen_loss, dis_loss, self.learning_rate, self.beta1) # 开始训练 saver = tf.train.Saver() step = 0 # 指定占用GPU比例 # tensorflow默认占用全部GPU显存 防止在机器显存被其他程序占用过多时可能在启动时报错 gpu_options = tf.GPUOptions(allow_growth=True) self.sess = tf.Session(config=tf.ConfigProto(gpu_options=gpu_options)) with tf.Session(config=tf.ConfigProto( gpu_options=gpu_options)) as sess: sess.run(tf.global_variables_initializer()) for epoch in range(self.epoch_size): batches = self.avatar.batches() for batch_imgs in batches: noises = np.random.uniform( -1, 1, size=(self.batch_size, self.noise_img_size)).astype(np.float32) # 优化 _ = sess.run(dis_optimizer, feed_dict={ real_imgs: batch_imgs, noise_imgs: noises }) _ = sess.run(gen_optimizer, feed_dict={noise_imgs: noises}) _ = sess.run(gen_optimizer, feed_dict={noise_imgs: noises}) step += 1 print(datetime.now().strftime('%c'), epoch, step) loss_dis = sess.run(dis_loss, feed_dict={ real_imgs: batch_imgs, noise_imgs: noises }) # 判别器对真实图片 loss_real = sess.run(real_loss, feed_dict={ real_imgs: batch_imgs, noise_imgs: noises }) # 判别器对生成器图片 loss_fake = sess.run(fake_loss, feed_dict={ real_imgs: batch_imgs, noise_imgs: noises }) # 生成器损失 loss_gen = sess.run(gen_loss, feed_dict={noise_imgs: noises}) print(datetime.now().strftime('%c'), ' epoch:', epoch, ' step:', step, ' loss_dis:', loss_dis, ' loss_real:', loss_real, ' loss_fake:', loss_fake, ' loss_gen:', loss_gen) model_path = os.getcwd() + os.sep + "avatar" + str( epoch) + ".model" saver.save(sess, model_path, global_step=step) if epoch % 5 == 0: self.gen(epoch)