ImportError: Failed to load PyTorch C extensions

[Andreas Tille <tille@debian.org>]

Hi,

when I pushed python-array-api-compat to new two weeks ago this has
built nicely on Salsa CI[1] but now it fails[2] when trying to load
pytorch:

=========================== short test summary info ============================
FAILED tests/test_array_namespace.py::test_array_namespace[None-torch] - ImportError: Failed to load PyTorch C extensions:
    It appears that PyTorch has loaded the `torch/_C` folder
    of the PyTorch repository rather than the C extensions which
    are expected in the `torch._C` namespace. This can occur when
    using the `install` workflow. e.g.
        $ python setup.py install && python -c "import torch"
    This error can generally be solved using the `develop` workflow
        $ python setup.py develop && python -c "import torch"  # This should succeed
    or by running Python from a different directory.
FAILED tests/test_array_namespace.py::test_array_namespace[2021.12-torch] - ImportError: Failed to load PyTorch C extensions:
...


Any idea what might be wrong here?

Kind regards
    Andreass.


[1] https://salsa.debian.org/python-team/packages/python-array-api-compat/-/pipelines/602473
[2] https://salsa.debian.org/python-team/packages/python-array-api-compat/-/jobs/5003765

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