[Bug] mmcv._ext builds without error, but ModuleNotFoundError on verification demo #3305
Description
Prerequisite
- I have searched Issues and Discussions but cannot get the expected help.
- The bug has not been fixed in the latest version(https://github.com/open-mmlab/mmcv).
Environment
I am building mmcv from source on my Windows 11 machine by following the steps for "Build and install MMCV" given at mmcv Github page. Specifically, I followed the instructions for Full version (CUDA ops) given there.
When I execute the command python setup.py build_ext given there, the display says:
building 'mmcv._ext' extension
After that it does compile several files and does not report any error.
When I execute the python setup.py develop command given there for installing the built package(s), it runs fine and also displays:
Successfully built mmcv
Installing collected packages: mmcv
Successfully installed mmcv-2.2.0
After that I ran the following command given there to "Validate Installation":
python .dev_scripts/check_installation.py
But, that results in the following error:
ModuleNotFoundError: No module named 'mmcv._ext'
Why would that be in spite of saying "building 'mmcv._ext' extension" and not reporting any error during either the build step or installation step?
Reproduces the problem - code sample
python .dev_scripts/check_installation.py
Reproduces the problem - command or script
python .dev_scripts/check_installation.py
Reproduces the problem - error message
(train) c:\qlabRoot\projects\VtTrain\mmcv>python .dev_scripts/check_installation.py
Traceback (most recent call last):
File "c:\qlabRoot\projects\VtTrain\mmcv.dev_scripts\check_installation.py", line 4, in
from mmcv.ops import box_iou_rotated
File "C:\qlabRoot\projects\VtTrain\mmcv\mmcv\ops_init_.py", line 3, in
from .active_rotated_filter import active_rotated_filter
File "C:\qlabRoot\projects\VtTrain\mmcv\mmcv\ops\active_rotated_filter.py", line 10, in
ext_module = ext_loader.load_ext(
'ext',
['active_rotated_filter_forward', 'active_rotated_filter_backward'])
File "C:\qlabRoot\projects\VtTrain\mmcv\mmcv\utils\ext_loader.py", line 13, in load_ext
ext = importlib.import_module('mmcv.' + name)
File "C:\Users\vajja\anaconda3\envs\train\Lib\importlib_init.py", line 88, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ModuleNotFoundError: No module named 'mmcv._ext'
Additional information
No response