Integrate PyTorch quantization APIs into ensemble export modules (#309)
Summary:
Pull Request resolved: https://github.com/pytorch/translate/pull/309
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16481
This gives us a boolean flag `quantize` on the `BeamSearch` module that allows us to apply FBGEMM quantization to a pretrained PyTorch model and export this to PyTorch native runtime.
Reviewed By: jmp84
Differential Revision: D13514776
fbshipit-source-id: 3f7cbff0782aae54c9623ad1ea7e66d7f49e2b32
