Specify cuda version in setup.py when pip install -e .

see: https://stackoverflow.com/questions/66738473/installing-pytorch-with-cuda-in-setup-py

In setup function, use something like:

"torch@https://download.pytorch.org/whl/cu111/torch-1.8.0%2Bcu111-cp37-cp37m-linux_x86_64.whl",
"torchvision@https://download.pytorch.org/whl/cu111/torchvision-0.9.0%2Bcu111-cp37-cp37m-linux_x86_64.wh",
"torchaudio@https://download.pytorch.org/whl/torchaudio-0.8.0-cp36-cp36m-linux_x86_64.whl"

version links are from: https://download.pytorch.org/whl/torch_stable.html

• method above is ok to download, but still failed to build.

The following succeeds for building sam-2 with cu118:

pip install torch==2.3.1 torchvision==0.18.1 torchaudio==2.3.1 --index-url https://download.pytorch.org/whl/cu118
pip install --no-build-isolation -e .
# and delete these packages in `setup.py`