Make tl.shape return tuple for PyTorch backend
#357
Merged
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Currently,
tl.shapereturns a tuple for most backends. However, with the PyTorch backend, it returns atorch.Sizeobject, which can make it more difficult to make backend agnostic code. This pull request makes it return a tuple instead and adds a test that fails if the object returned fromtl.shapeis not atuple.Alternatively, if we don't want to cast the
torch.Sizeto a tuple automatically, then we could add an optionalas_tupleargument to all backends. However, I made it cast to a tuple since that is what's done in the TensorFlow backend.