Resolve undefined errors in huggingface.py and model.py

[swarajpande5]

Resolves some undefined errors I found while exploring the codebase.

[ericcurtin]

We need more CI for this kinda thing, that's for sure

[swarajpande5]

@ericcurtin Definitely, flake8 could help in this, however flake8 might collide with autopep8 being used.

[ericcurtin]

SGTM, opened an issue so we can get to it at some point:

#125

I'm all for adding these tools, unless they start to make our builds unreasonably unstable, but we can always turn any of these tools off again if that happens.