Add Tensor::is_cpu, genericize TensorIterator (#54079)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/54079
Fixes https://github.com/pytorch/pytorch/issues/53815
Instead of testing if something is CUDA, we instead test if something
is not CPU. This in the general theming of "Don't be so darn CUDA
centric".
Intruigingly, we didn't have a is_cpu() method on Tensor. Which seems
like a big oversight and one of the reasons how we ended up in this
mess. So in it goes. Maybe we should also get this for Python bindings
as well (but in that case, should probably look into redoing all of the
is_X bindings so they aren't done manually).
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Reviewed By: ngimel
Differential Revision: D27109507
Pulled By: ezyang
fbshipit-source-id: abbe72c2e688c452ffe098d206cb79938b5824b1
