Is sofa-launcher Necessary for ModelOrderReduction?

[yu-mei]

Hi Community,

I am trying to use modelOrderReduction to simplify my robot. I am trying to test my environement using: runSofa modelOrderReduction.py accroding the guidance: https://modelorderreduction.readthedocs.io/en/latest/usage/install/installation.html. I used binary version so I did not setup: export PYTHONPATH=$PYTHONPATH:/PathToYourSofaSrcFolder/tools/sofa-launcher

I got the error that:

[DEPRECATED] [SofaPython3::SceneLoader] Unable to completely load the scene from file 'modelOrderReduction.py'.
Python exception:
ImportError: You need to give to PYTHONPATH the path to sofa-launcher in order to use this tool
Enter this command in your terminal (for temporary use) or in your .bashrc to resolve this:
export PYTHONPATH=/PathToYourSofaSrcFolder/tools/sofa-launcher

My SOFA version is v24.06.00 Binary for Linux, and the modelOrderReduction.py is under plugins/ModelOrderReduction/tools. My .bashrc is:

export SOFA_ROOT=/home/Software/SOFA_24.06.00/
export PYTHONPATH=/home/Software/SOFA_24.06.00/plugins/SofaPython3/lib/python3/site-packages:$PYTHONPATH
export PYTHONPATH=/home/Software/SOFA_24.06.00/plugins/STLIB/lib/python3/site-packages:$PYTHONPATH
alias runSofa='/home/Software/SOFA_24.06.00/bin/runSofa'

I am wondering if the modelOrderReduction.py requires the complied source version because of sofa-launcher.

[yu-mei]

Dear creative community members ( @bakpaul @alxbilger @hugtalbot @olivier-goury@EulalieCoevoet @damienmarchal), I am wondering if you have any comments on this basic but crucial question. Thanks for your attention!

[yu-mei]

Hi paul, It still has the same issue after I add this to my bash.rc and source it:

export PYTHONPATH=$PYTHONPATH:/home/yu/Apps/SOFA_24.06.00/share/sofa/sofa-launcher

The error is same:
ImportError: You need to give to PYTHONPATH the path to sofa-launcher in order to use this tool
Enter this command in your terminal (for temporary use) or in your .bashrc to resolve this:
export PYTHONPATH=/PathToYourSofaSrcFolder/tools/sofa-launcher

[bakpaul]

Two questions :

1. Did you make sure the folder existsed or you simply copy pasted my suggestion ? If it doesn't, you can dosnload sofa-launcher in a standalone fashion here : https://github.com/sofa-framework/sofa-launcher
2. I hope the file name bash.rc is a typo because it should be ~/.bashrc. Did you source your bashrc again after adding this line ?

[yu-mei]

Two questions :

1. Did you make sure the folder existsed or you simply copy pasted my suggestion ? If it doesn't, you can dosnload sofa-launcher in a standalone fashion here : https://github.com/sofa-framework/sofa-launcher
2. I hope the file name bash.rc is a typo because it should be ~/.bashrc. Did you source your bashrc again after adding this line ?

Hi Pual,

Sorry for delayed reply. To answer your questions:

1. yes, I am sure the sofa-launcher folder is located in the right place: /SOFA_24.06.00/share/sofa/sofa-launcher. And it is exactly same as the standalone fashion;
2. Yes, it is ~/.bashrc.

I am running in the terminal:
python3 modelOrderReduction.py

But the error is still there
Traceback (most recent call last): File "/home/yu/Software/SOFA_24.06.00/plugins/ModelOrderReduction/tools/modelOrderReduction.py", line 40, in <module> from mor.reduction import ReduceModel ModuleNotFoundError: No module named 'mor'

Is there anything I need to set up to import MOR? Thanks!

[bakpaul]

Hello, it is not the same error as before. Now it is mor that is not found. Make sure the filder containing mor Python module is present in your PYTHONPATH.

Be careful, environement loading (eg using conda env our venv) might sometimes break your PYTHONPATH. Make the export after loading your working env.

[yu-mei]

Hello, it is not the same error as before. Now it is mor that is not found. Make sure the filder containing mor Python module is present in your PYTHONPATH.

Be careful, environement loading (eg using conda env our venv) might sometimes break your PYTHONPATH. Make the export after loading your working env.

Hi, I am not sure how can I include the mor python module, and I am following the guidance in https://modelorderreduction.readthedocs.io/en/latest/usage/install/installation.html. It only suggests including the sofa-launcher in PYTHONPATH.

Yes, I used conda environment, I tired conda activate and then export the PYTHONPATH, but the error is still there. I tried not to use conda, just base environment, but it still has same issue cannot load mor.

[yu-mei]

Hello, it is not the same error as before. Now it is mor that is not found. Make sure the filder containing mor Python module is present in your PYTHONPATH.
Be careful, environement loading (eg using conda env our venv) might sometimes break your PYTHONPATH. Make the export after loading your working env.

Hi, I am not sure how can I include the mor python module, and I am following the guidance in https://modelorderreduction.readthedocs.io/en/latest/usage/install/installation.html. It only suggests including the sofa-launcher in PYTHONPATH.

Yes, I used conda environment, I tired conda activate and then export the PYTHONPATH, but the error is still there. I tried not to use conda, just base environment, but it still has same issue cannot load mor.

I just find after adding: export PYTHONPATH=/home/yu/Software/SOFA_24.06.00/plugins/ModelOrderReduction/lib/python3/site-packages:$PYTHONPATH to my .bashrc, it will solve my problem. I am wondering if I need to add the site-packages of each plugin to PYTHONPATH if I need to use python3 to run the scene.

[bakpaul]

Yes it is what I suggested. Otherwise, how could python know your module existe and where to find it ?

[yu-mei]

Yes it is what I suggested. Otherwise, how could python know your module existe and where to find it ?

I see. I thought it might like plugin_list.conf so that the sofapython3 can detect all plugins' site-packages only single time. Thank you for your answers and suggestions!