Fix up test code

tutorial-contents/401_CNN.py

@@ -122,7 +122,7 @@ for epoch in range(EPOCH):
 plt.ioff()
 
 # print 10 predictions from test data
-test_output = cnn(test_x[:10])
+test_output, _ = cnn(test_x[:10])
 pred_y = torch.max(test_output, 1)[1].data.numpy().squeeze()
 print(pred_y, 'prediction number')
 print(test_y[:10].numpy(), 'real number')