SRGAN-------discriminator
w_init = tf.random_normal_initializer(stddev=0.02)b_init = None # tf.constant_initializer(value=0.0)gamma_init = tf.random_normal_initializer(1., 0.02)和之前一样的初始化操作df_dim = 64lrelu = lambda x: tl.act.lrelu(x, 0.2)leaky_relu中alpha=0.2表示x<0时激活函数的