Got an error buildind old_detectron2

Got the following error when performing `pip install -e` on the `old-detectron2` directory.
```
~/miniconda3/envs/zsref/lib/python3.8/site-packages/torch/utils/cpp_extension.py:782: UserWarning: The detected CUDA version (11.5) has a minor version mismatch with the version that was used to compile PyTorch (11.3). Most likely this shouldn't be a problem.
```