fixed small bug in demo/gan/mnist and is stable version

demo/gan/gan_conf.py

@@ -31,7 +31,7 @@ print('mode=%s' % mode)
 # the dim of the noise (z) as the input of the generator network
 noise_dim = 10
 # the dim of the hidden layer
-hidden_dim = 15
+hidden_dim = 10
 # the dim of the generated sample
 sample_dim = 2
 

demo/gan/gan_trainer.py

@@ -91,7 +91,7 @@ def load_mnist_data(imageFile):
     data = data / 255.0 * 2.0 - 1.0
 
     f.close()
-    return data
+    return data.astype('float32')
 
 def load_cifar_data(cifar_path):
     batch_size = 10000