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9d84f9e6 - Fix fvcore flops counting for torchvision models

Fix fvcore flops counting for torchvision models Summary: For now, we only support fvcore flops counting for torchvision models. Reviewed By: FindHao Differential Revision: D47672523 fbshipit-source-id: dce911484ec63823272d49dea0b49be5e2f62398