pytorch

cc1902a5 - Revert "Add warning when importing caffe2 on build without BUILD_CAFFE2=1"

Revert "Add warning when importing caffe2 on build without BUILD_CAFFE2=1" This reverts commit b142a224c6ee4ed99361837bc8dd3f78cdb8f234. Reverted https://github.com/pytorch/pytorch/pull/73770 on behalf of https://github.com/suo