Export ElementwiseLinear to ONNX (Mul + Add). (#17411)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17411
Reshape-based approach to support dynamic shape.
The first Reshape flatten inner dimensions and the second one recover the actual shape.
No Shape/Reshape will be generated unless necessary.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16716
Reviewed By: zrphercule
Differential Revision: D14094532
Pulled By: houseroad
fbshipit-source-id: bad6a1fbf5963ef3dd034ef4bf440f5a5d6980bc
