Add a flag to enforce fp32 to fp16 conversion for all inputs of the onnxifi net. (#39931)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/39931
ATT.
Reviewed By: yinghai, ChunliF
Differential Revision: D21993492
fbshipit-source-id: ff386e6e9b95a783906fc1ae6a62462e6559a20b
