Conda install on Windows: cannot import OpenTURNS

[josephmure]

Hi! A Windows user sent me the following error:

import openturns as ot

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\...\AppData\Local\miniforge3\lib\site-packages\openturns\__init__.py", line 49, in <module>
    from .common import *
  File "C:\Users\...\AppData\Local\miniforge3\lib\site-packages\openturns\common.py", line 12, in <module>
    from . import _common
ImportError: DLL load failed while importing _common: La procédure spécifiée est introuvable.

This user did a fresh install of Miniforge3 for Windows: https://github.com/conda-forge/miniforge/releases/download/23.1.0-3/Miniforge3-23.1.0-3-Windows-x86_64.exe

On this fresh install, he ran the command to install openturns and pandas:

conda install openturns pandas

After the install (which reported no error), Pandas could be imported, but OpenTURNS could not (see error message above).

[josephmure]

Note that this user was in the end able to install and import OpenTURNS, but had to use pip.

[josephmure]

Update: the same issue has been reported by @antonio-canavate on our forum and the conda-forge bug tracker.

[amole-arup]

I have also had this problem with openturns in a micromamba environment. I installed everything using micromamba from conda-forge channel (including openturns). It only occurs when importing in a Spyder console. I haven't had any problem when using VS Code.

[jschueller]

yep, this is due to a conflict with numpy (and scipy) mingw runtime

a workaround is to use numpy binary from pip:
pip install numpy --force-reinstall --no-deps

[amole-arup]

Are you saying that it is a conflict between Spyder and NumPy? If you are talking about a direct conflict, then it does not make sense to me because I didn't have any errors when I imported when using VS Code (see screen capture). The environment is exactly the same as the one where I had an import error above.

[jschueller]

no between openturns and numpy, the latter being pulled by spyder

[amole-arup]

That seems to be a strange behaviour by Spyder. Why would it pull in a different version of NumPy than the one provided in the Environment?

[antonio-canavate]

Hi @jschueller, I have just tried and it works perfectly.

Thanks a lot

Best

Toni

[jschueller]

cf conda-forge/openturns-feedstock#186