diff tool (#66854)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66854
diff tool and script to test correctness of flatbuffer format
Test Plan:
`./verify_flatbuffer.sh | pastry`
P463163180
Reviewed By: zhxchen17
Differential Revision: D31752696
fbshipit-source-id: bea00102b21e62c02367853c8bec2742b483fbda