MMCV not compatible with Pytorch 2.6

[tqwork]

Looking in links: https://download.openmmlab.com/mmcv/dist/cu124/torch2.6.0/index.html
Collecting mmcv==2.2.0
Using cached mmcv-2.2.0.tar.gz (479 kB)
Installing build dependencies ... done
Getting requirements to build wheel ... error
error: subprocess-exited-with-error

× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> [17 lines of output]
Traceback (most recent call last):
File "/home/jovyan/miniconda3/envs/ft-fsod/lib/python3.10/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 389, in
main()
File "/home/jovyan/miniconda3/envs/ft-fsod/lib/python3.10/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 373, in main
json_out["return_val"] = hook(**hook_input["kwargs"])
File "/home/jovyan/miniconda3/envs/ft-fsod/lib/python3.10/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 143, in get_requires_for_build_wheel
return hook(config_settings)
File "/tmp/pip-build-env-os4yxgvo/overlay/lib/python3.10/site-packages/setuptools/build_meta.py", line 333, in get_requires_for_build_wheel
return self._get_build_requires(config_settings, requirements=[])
File "/tmp/pip-build-env-os4yxgvo/overlay/lib/python3.10/site-packages/setuptools/build_meta.py", line 301, in _get_build_requires
self.run_setup()
File "/tmp/pip-build-env-os4yxgvo/overlay/lib/python3.10/site-packages/setuptools/build_meta.py", line 520, in run_setup
super().run_setup(setup_script=setup_script)
File "/tmp/pip-build-env-os4yxgvo/overlay/lib/python3.10/site-packages/setuptools/build_meta.py", line 317, in run_setup
exec(code, locals())
File "", line 5, in
ModuleNotFoundError: No module named 'pkg_resources'
[end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed to build 'mmcv' when getting requirements to build wheel

[xuanlongORZ]

Hi,
This issue might be caused by the latest setuptools package, which removed pkg_resources. You can try to downgrade setuptools for example using pip install "setuptools<81" (the version in my environment is 60.2.0), then install mmcv again.

[tqwork]

Yes, my setuptools is the same version as yours. I still didn't manage to install it successfully. I will share my environment and the installed libraries.

GPU: H100
CUDA: 12.9
Python: 3.10.20

Package Version

---

addict 2.4.0
aliyun-python-sdk-core 2.16.0
aliyun-python-sdk-kms 2.16.5
certifi 2026.6.17
cffi 2.0.0
charset-normalizer 3.4.7
click 8.4.2
colorama 0.4.6
contourpy 1.3.2
crcmod 1.7
cryptography 49.0.0
cycler 0.12.1
filelock 3.14.0
fonttools 4.63.0
fsspec 2026.4.0
idna 3.18
Jinja2 3.1.6
jmespath 0.10.0
kiwisolver 1.5.0
Markdown 3.10.2
markdown-it-py 4.2.0
MarkupSafe 3.0.3
matplotlib 3.10.9
mdurl 0.1.2
mmengine 0.10.7
model-index 0.1.11
mpmath 1.3.0
networkx 3.4.2
numpy 2.2.6
nvidia-cublas-cu12 12.4.5.8
nvidia-cuda-cupti-cu12 12.4.127
nvidia-cuda-nvrtc-cu12 12.4.127
nvidia-cuda-runtime-cu12 12.4.127
nvidia-cudnn-cu12 9.1.0.70
nvidia-cufft-cu12 11.2.1.3
nvidia-curand-cu12 10.3.5.147
nvidia-cusolver-cu12 11.6.1.9
nvidia-cusparse-cu12 12.3.1.170
nvidia-cusparselt-cu12 0.6.2
nvidia-nccl-cu12 2.21.5
nvidia-nvjitlink-cu12 12.4.127
nvidia-nvtx-cu12 12.4.127
opencv-python 4.13.0.92
opendatalab 0.0.10
openmim 0.3.9
openxlab 0.1.3
ordered-set 4.1.0
oss2 2.17.0
packaging 24.2
pandas 2.3.3
pillow 12.2.0
pip 26.1.2
platformdirs 4.10.0
pycparser 3.0
pycryptodome 3.23.0
Pygments 2.20.0
pyparsing 3.3.2
python-dateutil 2.9.0.post0
pytz 2023.4
PyYAML 6.0.3
requests 2.28.2
rich 13.4.2
setuptools 60.2.0
six 1.17.0
sympy 1.13.1
tabulate 0.10.0
termcolor 3.3.0
tomli 2.4.1
torch 2.6.0+cu124
torchvision 0.21.0+cu124
tqdm 4.65.2
triton 3.2.0
typing_extensions 4.15.0
tzdata 2026.2
urllib3 1.26.20
wheel 0.47.0
yapf 0.43.0

Looking in links: https://download.openmmlab.com/mmcv/dist/cu124/torch2.6.0/index.html
Collecting mmcv==2.1.0
Using cached mmcv-2.1.0.tar.gz (471 kB)
Installing build dependencies ... done
Getting requirements to build wheel ... error
error: subprocess-exited-with-error

× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> [17 lines of output]
Traceback (most recent call last):
File "/home/jovyan/miniconda3/envs/ft-fsod/lib/python3.10/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 389, in
main()
File "/home/jovyan/miniconda3/envs/ft-fsod/lib/python3.10/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 373, in main
json_out["return_val"] = hook(**hook_input["kwargs"])
File "/home/jovyan/miniconda3/envs/ft-fsod/lib/python3.10/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 143, in get_requires_for_build_wheel
return hook(config_settings)
File "/tmp/pip-build-env-pnjxf1nr/overlay/lib/python3.10/site-packages/setuptools/build_meta.py", line 333, in get_requires_for_build_wheel
return self._get_build_requires(config_settings, requirements=[])
File "/tmp/pip-build-env-pnjxf1nr/overlay/lib/python3.10/site-packages/setuptools/build_meta.py", line 301, in _get_build_requires
self.run_setup()
File "/tmp/pip-build-env-pnjxf1nr/overlay/lib/python3.10/site-packages/setuptools/build_meta.py", line 520, in run_setup
super().run_setup(setup_script=setup_script)
File "/tmp/pip-build-env-pnjxf1nr/overlay/lib/python3.10/site-packages/setuptools/build_meta.py", line 317, in run_setup
exec(code, locals())
File "", line 5, in
ModuleNotFoundError: No module named 'pkg_resources'
[end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed to build 'mmcv' when getting requirements to build wheel

[xuanlongORZ]

I noticed that the traceback shows that the error occurs inside pip's isolated build environment: /tmp/pip-build-env-.../overlay/lib/python3.10/site-packages/ rather than your conda environment: miniconda3/envs/ft-fsod/lib/python3.10/site-packages/

This suggests that the temporary build environment created by pip either contains a different setuptools installation or an incomplete one, where pkg_resources is unavailable. So the issue may be related to pip's build isolation rather than mmcv or PyTorch itself.

I'm afraid I'm not good at handling these ... GPT's suggestion is to use pip install --no-build-isolation mmcv==2.1.0 or pip install -U openmim; mim install mmcv==2.1.0, you might have a try.