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url-kaist / patchwork-plusplus

Patchwork++: Fast and robust ground segmentation method for 3D LiDAR scans. @ IROS'22

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I cannot run python example code (demo_sequential.py and demo_visualize). I get cannot find pypatchworkpp!

khaledmohamedgamal opened this issue · comments

commented
  • The pypatchworkpp.cpython-38-x86_64-linux-gnu.so is built in /build/python_wrapper. However when I run python examples/python/demo_sequential.py, I get this message Cannot find pypatchworkpp!
  • The CPP examples work fine.
  • When I was searching for similar error I found someone who solved similar problem with pybind11, and he wrote "I fixed this by making sure the module name in my bindings macro, matches the module name in the CMakeLists.txt file."
  • https://stackoverflow.com/questions/50688184/how-do-i-import-a-module-created-with-pybind11-on-ubuntu
commented

Hi @khaledmohamedgamal,

Could you please try sudo make install after make? I'm not sure that it solve the problem, but please try it and let me know your progress. I will try to find other potential causes. Thank you.

commented

Thanks a lot @seungjae24 for your reply, and the work you have done in this repo,
I found the solution it is related that I have many version of python in my machine, and pybind11 when creating the .so, it used the python version in usr/local. For example, I have conda environment with python 3.9, but the python that pybind11 sees is python 3.7; therefore, when I tried to import pypatchworkpp from python script with python version different than the python version that pybind11 sees, I got this error.

Here is the solution to specify the python version:
The target Python version can be selected by setting PYBIND11_PYTHON_VERSION or an exact Python installation can be specified with PYTHON_EXECUTABLE when you run cmake. For example:

cmake -DPYBIND11_PYTHON_VERSION**=3**.6 ..

# Another method:
cmake -DPYTHON_EXECUTABLE**=**/path/to/python ..

commented

Thank you for sharing your problem and solution, @khaledmohamed00!

It will help others who may struggle similar situation as you. Thank you once again :)