pytorch

f56c59ea - clarify when to use `as_tuple` in `torch.nonzero`

clarify when to use `as_tuple` in `torch.nonzero` Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/31798 Differential Revision: D19272332 Pulled By: zou3519 fbshipit-source-id: 954d086a7b9f1a719e0dac303a4253bf7ec8e9f4