Allow dims=0 in torch.tensordot call (#61331)
Summary:
In one of my previous PRs that rewrite `tensordot` implementation, I mistakenly take empty value of `dims_a` and `dims_b` as illegal values. This turns out to be not true. Empty `dims_a` and `dims_b` are supported, in fact common when `dims` is passed as an integer. This PR removes the unnecessary check.
Fixes https://github.com/pytorch/pytorch/issues/61096
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61331
Reviewed By: eellison
Differential Revision: D29578910
Pulled By: gmagogsfm
fbshipit-source-id: 96e58164491a077ddc7a1d6aa6ccef8c0c9efda2
