Pytorch nn.MSELoss without specifying target
I was having difficulty with my loss getting stuck at a particular value. It would always decrease to a certain value, then stop decreasing. The code regarding the loss was:
criterion = nn.MSELoss()
loss = criterion(y_pred, y_batch.unsqueeze(1))

When I changed it to:
criterion = nn.MSELoss()
loss = criterion(y_pred, target=y_batch)

the issue was fixed.
What was happening before when the target was not specified? Does the target need to be specified for every Pytorch loss function? I found nothing in the documentation about target specifications.

It looks like target is the name of the second positional argument, that's all. The only difference between the two lines is the unsqueezing of dim=1 on the second one.
