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import os import textwrap import pytest from sklearn import __version__ from sklearn.utils._openmp_helpers import _openmp_parallelism_enabled def test_openmp_parallelism_enabled(): # Check that sklearn is built with OpenMP-based parallelism enabled. # This test can be skipped by setting the environment variable # ``SKLEARN_SKIP_OPENMP_TEST``. if os.getenv("SKLEARN_SKIP_OPENMP_TEST"): pytest.skip("test explicitly skipped (SKLEARN_SKIP_OPENMP_TEST)") base_url = "dev" if __version__.endswith(".dev0") else "stable" err_msg = textwrap.dedent( """ This test fails because scikit-learn has been built without OpenMP. This is not recommended since some estimators will run in sequential mode instead of leveraging thread-based parallelism. You can find instructions to build scikit-learn with OpenMP at this address: https://scikit-learn.org/{}/developers/advanced_installation.html You can skip this test by setting the environment variable SKLEARN_SKIP_OPENMP_TEST to any value. """ ).format(base_url) assert _openmp_parallelism_enabled(), err_msg
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