Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45936
`Tensor` has been a view into a `Function` that was supposed to be used
for a more general case when we have multiple computations over the same
domain (aka multiple output functions). We have never got to a point
where we need this and now have other ideas in mind on how to support
this case if need be. For now, let's just nuke `Function` to reduce the
overall system complexity.
The change should not affect any existing behavior.
Test Plan: Imported from OSS
Reviewed By: bertmaher
Differential Revision: D24153214
Pulled By: ZolotukhinM
fbshipit-source-id: 26d5f11db5d661ff5e1135f4a49eff1c6d4c1bd5
