pytorch

614871d9 - use relative path to load libthnvrtc (#19690)

use relative path to load libthnvrtc (#19690) Summary: We had a few hard to repro cases where very occasionally libthnvrtc failed to be loaded due to what looked like garbled dladdr return in `info.dli_fname` field. We could not root cause why this is happening, but this workaround avoids the problem altogether. $ORIGIN is already added to RPATH as the first search location, so dlopen("libthnnvrtc.so") will look for libthnvrtc in the caller (`libtorch.so.1`) directory, which was the purpose of the previous code that was getting `libtorch.so.1` directory using dladdr. ``` root@4ec0aab027a0:/opt/conda/lib/python3.6/site-packages/torch/lib# readelf -d ./libtorch.so.1 | grep RPATH 0x000000000000000f (RPATH) Library rpath: [$ORIGIN:/usr/local/cuda/lib64:/opt/conda/lib] ``` Hopefully, same should be happening on Mac. cc zdevito ezyang Pull Request resolved: https://github.com/pytorch/pytorch/pull/19690 Differential Revision: D15076990 Pulled By: soumith fbshipit-source-id: a4d2992ccf26953f1fc73f17c4e752d69c58e2fc