Adds model verification testing#467

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PulkitMishra wants to merge 4 commits intofacebook:mainfrom

PulkitMishra:model_validate

Commits on Aug 21, 2021

adds verify_models folder for integration testing
PulkitMishra
committed
adds script for creating virtual environment and a pyre connection
PulkitMishra
committed

Commits on Aug 22, 2021