Tests test_theil_sen_parallel and test_multi_output_classification_partial_fit_parallelism hang on Windows #12263
Description
Description
Install scikit-learn 0.20.0 on Windows as follows:
conda create -n hang python=3.6.5
pip install scikit-learn==0.20.0
pip install pytest
Steps/Code to Reproduce
The following two individual test runs hang (never finish, and remain uninterruptable):
pytest -v --pyarg sklearn.tests.test_multioutput::test_multi_output_classification_partial_fit_parallelismpytest -v --pyarg sklearn.linear_model.tests.test_theil_sen::test_theil_sen_parallelExpected Results
Expecting them to pass as they do on Linux, or skipped in the distribution
Actual Results
Tests hang in both pip installed scikit-learn, as well in scikit-learn installed via conda itself.
Reproduced on "Windows Server 2012 R2 Standard".
Versions
>pip list
Package Version
-------------- ---------
atomicwrites 1.2.1
attrs 18.2.0
certifi 2018.8.24
colorama 0.3.9
more-itertools 4.3.0
numpy 1.15.2
pip 10.0.1
pluggy 0.7.1
py 1.6.0
pytest 3.8.2
scikit-learn 0.20.0
scipy 1.1.0
setuptools 40.2.0
six 1.11.0
wheel 0.31.1
wincertstore 0.2