Separate libtorch tests from libtorch build. (#26927)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/26927
When we build a "normal" copy of PyTorch, we internally build a copy
of libtorch. If we want to test libtorch: we have a choice:
test against the regular PyTorch build, or test against the libtorch
only build. All of our libtorch tests require Python-side PyTorch
to run. So it makes more sense to test the regular PyTorch build.
There is probably still utility in making sure that it is still
possible to build libtorch only, but in that case we should endeavour
to run tests that ONLY require libtorch build, and not Python side
stuff.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Differential Revision: D17695384
Pulled By: ezyang
fbshipit-source-id: 02522a8be0f5944f2b6255a8f1281e53ce2dcc6f
