OSError: CUDA_HOME environment variable is not set. Please set it to your CUDA install root.

[Charlie-Steer]

Upon running ComfyUI I'm getting this error: "OSError: CUDA_HOME environment variable is not set. Please set it to your CUDA install root."

This is on Linux Mint, but I got the same issue when trying previously on Windows 10. I tried reinstalling the python "torch" module, as it seems to be responsible for installing CUDA if I'm not mistaken. I tried installing torch with both commands provided in the ComfyUI repo for both stable and nightly, but none fixed the issue:

pip install torch torchvision torchaudio --extra-index-url https://download.pytorch.org/whl/cu121

pip install --pre torch torchvision torchaudio --index-url https://download.pytorch.org/whl/nightly/cu121

Error Log:

Traceback (most recent call last):
  File "/home/charlie/projects/ComfyUI/nodes.py", line 1888, in load_custom_node
    module_spec.loader.exec_module(module)
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/home/charlie/projects/ComfyUI/custom_nodes/human-parser-comfyui-node/__init__.py", line 1, in <module>
    from .HumanParserLIPCustomNode import HumanParserLIPCustomNode
  File "/home/charlie/projects/ComfyUI/custom_nodes/human-parser-comfyui-node/HumanParserLIPCustomNode.py", line 5, in <module>
    from .utils import generate
  File "/home/charlie/projects/ComfyUI/custom_nodes/human-parser-comfyui-node/utils.py", line 8, in <module>
    from .schp import networks
  File "/home/charlie/projects/ComfyUI/custom_nodes/human-parser-comfyui-node/schp/networks/__init__.py", line 3, in <module>
    from .AugmentCE2P import resnet101
  File "/home/charlie/projects/ComfyUI/custom_nodes/human-parser-comfyui-node/schp/networks/AugmentCE2P.py", line 21, in <module>
    from ..modules import InPlaceABNSync
  File "/home/charlie/projects/ComfyUI/custom_nodes/human-parser-comfyui-node/schp/modules/__init__.py", line 1, in <module>
    from .bn import ABN, InPlaceABN, InPlaceABNSync
  File "/home/charlie/projects/ComfyUI/custom_nodes/human-parser-comfyui-node/schp/modules/bn.py", line 10, in <module>
    from .functions import *
  File "/home/charlie/projects/ComfyUI/custom_nodes/human-parser-comfyui-node/schp/modules/functions.py", line 12, in <module>
    _backend = load(name="inplace_abn",
  File "/home/charlie/projects/ComfyUI/venv/lib/python3.10/site-packages/torch/utils/cpp_extension.py", line 1309, in load
    return _jit_compile(
  File "/home/charlie/projects/ComfyUI/venv/lib/python3.10/site-packages/torch/utils/cpp_extension.py", line 1719, in _jit_compile
    _write_ninja_file_and_build_library(
  File "/home/charlie/projects/ComfyUI/venv/lib/python3.10/site-packages/torch/utils/cpp_extension.py", line 1809, in _write_ninja_file_and_build_library
    extra_ldflags = _prepare_ldflags(
  File "/home/charlie/projects/ComfyUI/venv/lib/python3.10/site-packages/torch/utils/cpp_extension.py", line 1901, in _prepare_ldflags
    if (not os.path.exists(_join_cuda_home(extra_lib_dir)) and
  File "/home/charlie/projects/ComfyUI/venv/lib/python3.10/site-packages/torch/utils/cpp_extension.py", line 2419, in _join_cuda_home
    raise OSError('CUDA_HOME environment variable is not set. '
OSError: CUDA_HOME environment variable is not set. Please set it to your CUDA install root.

Cannot import /home/charlie/projects/ComfyUI/custom_nodes/human-parser-comfyui-node module for custom nodes: CUDA_HOME environment variable is not set. Please set it to your CUDA install root.

It only seems an issue with this particular node:

Import times for custom nodes:
   0.0 seconds: /home/charlie/projects/ComfyUI/custom_nodes/image-resize-comfyui
   0.0 seconds: /home/charlie/projects/ComfyUI/custom_nodes/ComfyUI_IPAdapter_plus
   0.0 seconds: /home/charlie/projects/ComfyUI/custom_nodes/cozy-sal-vton
   0.0 seconds: /home/charlie/projects/ComfyUI/custom_nodes/rgthree-comfy
   0.0 seconds: /home/charlie/projects/ComfyUI/custom_nodes/ComfyUI_essentials
   0.4 seconds: /home/charlie/projects/ComfyUI/custom_nodes/ComfyUI-Impact-Pack
   0.4 seconds (IMPORT FAILED): /home/charlie/projects/ComfyUI/custom_nodes/human-parser-comfyui-node
   1.0 seconds: /home/charlie/projects/ComfyUI/custom_nodes/was-node-suite-comfyui

[gabidobo]

Ok so for some reason the CUDA_HOME env var isn't set by the cuda install process in your scenario, but it is required for loading CPP extensions like our node does.

I think this thread might clear some things up: conda/conda#7757

It's a simple case of pointing the CUDA_HOME var to your CUDA homedir, but I'm not really sure where that is for you.

I'd also check if cudatoolkit is installed, and try installing it if not.