BUG: segfaults in testsuite with PyPy on ppc64le #16956
Description
Describe the bug
While working on conda-forge/scikit-learn-feedstock#123, I found that some tests segfault specifically on ppc64le with PyPy (but not with other runtimes on ppc64le, or with PyPy on other platforms). I gather that there's no CI for PyPy here, but in any case, @rth asked me to open a bug here.
Here are the logs from the CI run .
=================================== FAILURES ===================================
________________________ ensemble/tests/test_bagging.py ________________________
[gw0] linux -- Python 3.6.9 $PREFIX/bin/python
worker 'gw0' crashed while running 'ensemble/tests/test_bagging.py::test_sparse_classification'
________________________ linear_model/tests/test_sgd.py ________________________
[gw2] linux -- Python 3.6.9 $PREFIX/bin/python
worker 'gw2' crashed while running 'linear_model/tests/test_sgd.py::test_sgd_averaged_computed_correctly[SGDRegressor]'
________________________ metrics/tests/test_ranking.py _________________________
[gw1] linux -- Python 3.6.9 $PREFIX/bin/python
worker 'gw1' crashed while running 'metrics/tests/test_ranking.py::test_score_scale_invariance'
__________________ manifold/tests/test_spectral_embedding.py ___________________
[gw3] linux -- Python 3.6.9 $PREFIX/bin/python
worker 'gw3' crashed while running 'manifold/tests/test_spectral_embedding.py::test_spectral_embedding_callable_affinity[sparse]'
rker 'gw3' crashed while running 'manifold/tests
=============================== warnings summary ===============================
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