Apply PEP 8 formatting to transformer_tutorial.py imports

[jgerityneurala]

This PR brings all imports to the top of the surrounding code, according to PEP 8.

The change that brought me here was

class TransformerModel(nn.Module):
    def __init__(self, ntoken, ninp, nhead, nhid, nlayers, dropout=0.5):
        super(TransformerModel, self).__init__()
        from torch.nn import TransformerEncoder, TransformerEncoderLayer
        # ...

An import inside of __init__() like this is extremely uncommon, and it does not look like it's necessary to have it here in this case. If there is a reason the change shouldn't be made, there should explanatory text of why it is an exception to "imports are always at the top of the file" as PEP 8 has it. I know this project isn't explicitly PEP 8, but this doesn't vary too much across style conventions IME.

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[holly1238]

Hi @jgerityneurala! Can you sign the CLA agreement so that I can merge the pull request? Thanks!

[jgerityneurala]

Hi @jgerityneurala! Can you sign the CLA agreement so that I can merge the pull request? Thanks!

Whoops, I didn't realize there was one when I submitted this PR. Just signed it, thanks.

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[jgerityneurala]

CI failure is due to exceeding the timeout, shouldn't be caused by this PR's content