pytorch

6c235ef2 - Allow `std=0` in `torch.normal`, and error if `std<0` (#51317)

Allow `std=0` in `torch.normal`, and error if `std<0` (#51317) Summary: Part of https://github.com/pytorch/pytorch/issues/49998 Pull Request resolved: https://github.com/pytorch/pytorch/pull/51317 Reviewed By: bdhirsh Differential Revision: D27253939 Pulled By: mruberry fbshipit-source-id: af7a72c3d91549b1a88b73849b6973e7619dc50b