fix: remove useless dependencies

gan_03.py

@@ -3,7 +3,7 @@
 import matplotlib.pyplot as plt
 import numpy as np
 
-from keras.layers import Dense, Flatten, Reshape, Activation, BatchNormalization, Dropout, Input, Embedding, Multiply, Concatenate
+from keras.layers import Activation, BatchNormalization, Concatenate, Dense, Embedding, Flatten, Input, Multiply, Reshape
 from keras.layers.advanced_activations import LeakyReLU
 from keras.layers.convolutional import Conv2D, Conv2DTranspose
 from keras.models import Sequential, Model