Fix blitz neural networks shape mismatch (#213)

Author: tiangolo

beginner_source/blitz/neural_networks_tutorial.py

@@ -160,6 +160,7 @@ def num_flat_features(self, x):
 
 output = net(input)
 target = Variable(torch.arange(1, 11))  # a dummy target, for example
+target = target.view(1, -1)  # make it the same shape as output
 criterion = nn.MSELoss()
 
 loss = criterion(output, target)