Remove unnecessary character from beginner's autograd example

[sonnyding1]

Description

In the "Learning PyTorch with Examples" tutorial, the autograd code block started with rimport. This PR fixed the typo by removing r.

[pytorch-bot]

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[malfet]

r prefix in Python means raw string, i.e. one where does not need to escape \
I.e.

>>> print("\n")


>>> print(r"\n")
\n

[sonnyding1]

r prefix in Python means raw string, i.e. one where does not need to escape \ I.e.

Thank you for the heads up, then it should be the problem of the includenodoc directive not parsing the docstring correctly. It seems includenodoc used to be defined in a file custom_directives.py, as mentioned in #550, but the file was removed, and the definition of includenodoc is moved outside of this repository.

Do you know where the includenodoc directive is maintained now? I'd be happy to create an issue and a pull request over there to fix this bug.

[svekars]

I guess we can update the regex here: https://github.com/pytorch/pytorch_sphinx_theme/blob/pytorch_sphinx_theme2/pytorch_sphinx_theme2/custom_directives.py#L39 to accommodate for raw strings. Not sure why it worked before with the old theme. includenodoc only used in that one file.

[sonnyding1]

Thank you, I'll close this PR and submit another over there.