Populate producer_info.json in any PyTorch model at FB (#21662)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21662
Use hook added in https://github.com/pytorch/pytorch/pull/20863 to auto-write a file with environment information (including user, machine, Flow, etc).
Reviewed By: natalialunova
Differential Revision: D15690185
fbshipit-source-id: ccaaeda9562db32925041d18f394fb98fab8db99
