pytorch

d98bd5e1 - [test all] Back out "Revert D20171428: [profiler] fix chrome tracing for profiler run with cuda"

[test all] Back out "Revert D20171428: [profiler] fix chrome tracing for profiler run with cuda" Summary: There was an error in https://github.com/pytorch/pytorch/pull/30724/files that resulted in export_chrome_trace generating invalid JSON. This only came up when the profiler is run with use_cuda=True from what it looks like. In the future, we should have tests that ensure we generate valid JSON because we no longer use the json library. ghstack-source-id: 99508836 Test Plan: Added a unit test. Differential Revision: D20237040 fbshipit-source-id: 510befbdf4ec39632ac56544afcddee6c8cc3aca