benchmark

93a4a7fb - Use fuser contextmanager (#784)

Use fuser contextmanager (#784) Summary: This PR uses `fuser` context manager to manage run contexts to replace the old "hacky" implementation. Because the instance generated by `contextlib.contextmanager` can only be applied once, we need to pass in a lambda and instantiate a new instance every time we run the benchmark Pull Request resolved: https://github.com/pytorch/benchmark/pull/784 Reviewed By: davidberard98 Differential Revision: D34797602 Pulled By: xuzhao9 fbshipit-source-id: 95d46301c613b796e2b4c9aafc9e4b1a7fe6e59a