QA doc: import torch before it is used

[ByronHsu]

What does this PR do?

import torch before it is used in qa doc. Otherwise, it complains import error.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read the contributor guideline,
  Pull Request section?
• Was this discussed/approved via a Github issue or the forum? Please add a link
  to it if that's the case.
• Did you make sure to update the documentation with your changes? Here are the
  documentation guidelines, and
  here are tips on formatting docstrings.
• Did you write any new necessary tests?

Who can review?

@stevhliu

[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.

[stevhliu]

Thanks for the fix! I think you just need to run make style to get the tests to pass. Also pinging @amyeroberts for a final review!

[amyeroberts]

@ByronHsu Thanks for you contribution and improving our docs!

Just a small nit from me. As @stevhliu mentions, you'll need to run make fixup locally at the top level of the repo and push any changes to resolve the failing quality checks. Once done, we're good to merge :)

[ByronHsu]

@amyeroberts @stevhliu mind checking again? thanks!

[amyeroberts]

@ByronHsu Thanks again for fixing! All looks good 👍