pytorch

37362fff - graph mode: util for fusion of functions which require observation (#39413)

graph mode: util for fusion of functions which require observation (#39413) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/39413 Implementing the request from https://github.com/pytorch/pytorch/pull/39095 WIP so we can align on the API, once it looks good will amend the PR to apply to all relevant functions. Test Plan: ``` python test/test_quantization.py TestQuantizeScriptPTSQOps.test_hardswish ``` Imported from OSS Differential Revision: D21885263 fbshipit-source-id: 029339a99f8c50e45dd1dfb7fd89c20e3188720d