Remove Caffe2 thread-pool leak warning (#60318)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/57273.
Some users reported that they dislike the Caffe2 thread-pool leak warning, as it floods their logs, and have requested disabling it, or have asked for a way to filter it.
It seems caffe2 pthreadpool already exists because of some dependency in the binary distribution, so `torch.set_num_threads()` invocation isn't required to reproduce the issue (as is otherwise the case when building from the master branch).
https://github.com/pytorch/pytorch/issues/60171's test script does have a `set_num_threads` invocation & hence that's why I was able to reproduce the issue after building from the master branch's source code.
cc malfet & ejguan, who have the authority to make a decision.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/60318
Reviewed By: albanD
Differential Revision: D29265771
Pulled By: ezyang
fbshipit-source-id: 26f678af2fec45ef8f7e1d39a57559790eb9e94b
