undefined symbol: dnrm2_

[vnmabus]

If you install the latest version of this library in an empty environment in Python 3.9, and you then perform import fdasrsf, the following error is raised:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File ".../lib/python3.9/site-packages/fdasrsf/__init__.py", line 43, in <module>
    from .time_warping import (
  File ".../lib/python3.9/site-packages/fdasrsf/time_warping.py", line 9, in <module>
    import fdasrsf.utility_functions as uf
  File ".../python3.9/site-packages/fdasrsf/utility_functions.py", line 24, in <module>
    import crbfgs as cr
ImportError: .../python3.9/site-packages/crbfgs.cpython-39-x86_64-linux-gnu.so: undefined symbol: dnrm2_

I obtained that error in my CI tests.

[jdtuck]

This is caused by not finding a blas library in the CI. The new optimizer (rbfgs) in Cython requires blas. In conda this is not an issue and on most machines. Easiest fix is to pip install mkl-devel in the CI. I have debated adding this to the requirements, but haven't decided as it pops up in small situations.

[jdtuck]

Also sorry @vnmabus I totally missed this one.

[vnmabus]

@jdtuck I followed your advice, but it still does not work (it now says ImportError: DLL load failed while importing crbfgs: The specified module could not be found.):
https://github.com/GAA-UAM/scikit-fda/actions/runs/7883161339/job/21509586537

If the issue is due to the rbfgs optimizer (which I do not use) a possible way to sidestep the problem is to import the module only when that particular optimizer is used.

[jdtuck]

We could do that, but I don't understand this error. It tells me the Windows CI is not compiling properly....

[jdtuck]

@vnmabus #38 should fix this for you, can you confirm.

[vnmabus]

If I both install mkl-devel and use #38, then it works for me. However, this is just a workaround, and the cause for the error remains to be identified.

[jdtuck]

Agreed but it is a work around for now and I think this is a windows specific issue

[jdtuck]

I will merge and release today for this and keep exploring