BFloat16 support for torch.sign (#45244)
Summary:
Added BF16 support for torch.sign on CUDA
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45244
Reviewed By: zou3519
Differential Revision: D23932304
Pulled By: izdeby
fbshipit-source-id: e50b9510ecf2337ec0288392d6950046116b2599
