Support 0-d tensors in CUDA MultiLabelMarginCriterion. (#30765)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30765
It is already supported in CPU and is pretty easy to add for consistency.
Restacked version of: https://github.com/pytorch/pytorch/pull/30727
Test Plan: Imported from OSS
Differential Revision: D18821557
Pulled By: gchanan
fbshipit-source-id: e6aa3e91000ff3fd63941defc7d30aef58ae2f82
