Bind VariableFunctions as a module, not a class with static methods. (#38136)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/38136
This was a bit trickier than I expected, because modules have
to be importable to be pickleable, but adding a module to another
module in the C API isn't really the right way to make it importable.
We hack around it by manually adding the module to sys.modules.
Thanks Richard Zou for an extremely useful prior attempt which helped
me make this work.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Differential Revision: D21487840
Pulled By: ezyang
fbshipit-source-id: 368da9b9c50e5de4d7dd265e6f9f189a882d75c1
