[Issue 7] Update import torchvision.models as models

[gesuwen]

Create a new _UpdateTorchvisionModelsImports class to replace all "import torchvision.models as models" to "from torchvision import models"

[gesuwen]

@kit1980 I am aware that we could refactor the new class I added and _UpdateFunctorchImports into a generalized class for import replacement. Shall I do it here, or leave it for a future commit?

[kit1980]

@gesuwen Thank you for the PR.

I've left some comments and I think in general this should be a separate rule with a separate code, like TOR201, to report the issue.
Just reporting the issue should be probably done first.
Changing the code can be done later, in a different PR even.

[gesuwen]

@gesuwen Thank you for the PR.

I've left some comments and I think in general this should be a separate rule with a separate code, like TOR201, to report the issue. Just reporting the issue should be probably done first. Changing the code can be done later, in a different PR even.

@kit1980 Thanks for your review! I just updated the PR, resolving all suggestions. Commit 2 move the new visitor to the vision dir and include giving LintViolation warning + replacement option. Could you please help review again and let me know if there is any addition suggestion?

[kit1980]

@gesuwen Looks good to me, thanks!

I'll do the codemod part later after factoring some things around import replacements.