error when building from source

[Shaistrong]

Command

pip install -v -U git+https://github.com/facebookresearch/xformers.git@main#egg=xformers

To Reproduce

attempt to install from source

Environment

• PyTorch Version (e.g., 1.0): 2.1.0+cu121
• OS (e.g., Linux): Microsoft Windows 11 Home
• How you installed PyTorch (conda, pip, source): conda
• Build command you used (if compiling from source): pip install -v -U git+https://github.com/facebookresearch/xformers.git@main#egg=xformers
• Python version: 3.10.9
• CUDA/cuDNN version: 12.1
• GPU models and configuration: 4070ti
• Any other relevant information:
• the error I'm getting is: ninja: error: Stat(C:/Users/joker/AppData/Local/Temp/pip-install-0um11ta2/xformers_7bae8db5c8e145569eac020431c758f0/build/temp.win-amd64-cpython-310/Release/Users/joker/AppData/Local/Temp/pip-install-0um11ta2/xformers_7bae8db5c8e145569eac020431c758f0/third_party/flash-attention/csrc/flash_attn/flash_api.obj): Filename longer than 260 characters during building process

[danthe3rd]

Hi @Shaistrong Windows has a limitation on the maximum path length - that's quite annoying, but it's not related to xFormers. I'm not sure how to work around this... Can't you install a binary wheel from xFormers with this directly?

pip3 install -U xformers --index-url https://download.pytorch.org/whl/cu121

[arvindsun]

I think I have a fix here: https://github.com/facebookresearch/xformers/pull/935

[soulteary]

try https://github.com/facebookresearch/xformers/issues/960