torch torchvision packaging ninja flash-attn --no-build-isolation -v --disable-pip-version-check --no-cache-dir --no-build-isolation --config-settings "--build-option=--cpp_ext" --config-settings "--build-option=--cuda_ext" git+https://github.com/NVIDIA/apex.git -U xformers --index-url https://download.pytorch.org/whl/cu121 -e git+https://github.com/hpcaitech/Open-Sora.git#egg=open-sora