[quant][graphmode][fx] Testing torchvision (#43526)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/43526
Add tests for graph mode quantization on torchvision and make sure it matches
current eager mode quantization
Test Plan: Imported from OSS
Reviewed By: vkuzo
Differential Revision: D23306683
fbshipit-source-id: 30d27e225d4557bfc1d9aa462086e416aa9a9c0e
