pytorch

4cf76574 - Raise CalledProcessError when torch.distributed launch process not return 0 (#16069)

Raise CalledProcessError when torch.distributed launch process not return 0 (#16069) Summary: `torch.distributed.launch.py` will not raise error when `subprocess.Popen` is not return 0. For better debugging it should always raise an error if processes launched have unusual behavior Pull Request resolved: https://github.com/pytorch/pytorch/pull/16069 Differential Revision: D13709467 Pulled By: ezyang fbshipit-source-id: 31d32a5ec8fed7bccd62d845bfba0e670ed3fe20