Test TensorTypeSet instead of autograd_meta_ for variable-ness. (#28543)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/28543
By the current autograd_meta_ <=> type_set_ invariant (now explicitly documented
in the right place!), these are equivalent. But when I introduce null
autograd_meta_ optimization, they won't be equivalent anymore: TensorTypeSet is
going to give me the right information no matter what.
In the long run, this patch will be a wash, because everything will "be a variable"
in the long term. But I am making this change now to make sure that the invariant
actually holds.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Differential Revision: D18171157
Pulled By: ezyang
fbshipit-source-id: cbba8fd5df9e6873a8757925db5f578fecbd2486
