Torchhub: More robust assumption regarding main or master branch (#64364)
Summary:
Closes https://github.com/pytorch/pytorch/issues/63753
This PR changes the assumption regarding the default branch of a repo to the following:
> If main exist then use main,otherwise use master
This will make torchhub more robust w.r.t. to the ongoing changes where repo use `main` instead of `master` as the development / default branch.
cc nairbv NicolasHug
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64364
Reviewed By: saketh-are
Differential Revision: D30731551
Pulled By: NicolasHug
fbshipit-source-id: 7232a30e956dcccca21933a29de5eddd711aa99b
