The build for Linux pylatest_pip_openblas_pandas Azure pipeline, still raise warnings in test execution (see cmarmo/scikit-learn/#11).

command line and environment

+ python -m pytest --showlocals --durations=20 --junitxml=test-data.xml --cov-config=/home/vsts/work/1/s/.coveragerc --cov sklearn -Werror::DeprecationWarning -Werror::FutureWarning -Werror --pyargs sklearn
============================= test session starts ==============================
platform linux -- Python 3.8.1, pytest-4.6.2, py-1.8.1, pluggy-0.13.1
rootdir: /home/vsts/work/tmp_folder, inifile: setup.cfg
plugins: xdist-1.31.0, cov-2.8.1, forked-1.1.3
collected 9107 items / 3 errors / 9104 selected

Failing tests

• sklearn/ensemble/tests/test_gradient_boosting.py:431: [MRG] Define custom markers for pytest. #16652

  _pytest.warning_types.PytestUnknownMarkWarning: Unknown pytest.mark.network - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/latest/mark.html
  

• sklearn/utils/estimator_checks.py:401: in
  checks_with_marks = (

  sklearn.exceptions.SkipTestWarning: Explicit SKIP via _skip_test tag for estimator ClassifierChain.
  

• sklearn/utils/estimator_checks.py:349: in
  yield from ((estimator, partial(check, name))

  sklearn.exceptions.SkipTestWarning: Explicit SKIP via _skip_test tag for estimator ClassifierChain.
  

• sklearn/utils/estimator_checks.py:252: in _yield_all_checks
  warnings.warn("Explicit SKIP via _skip_test tag for estimator "

  sklearn.exceptions.SkipTestWarning: Explicit SKIP via _skip_test tag for estimator ClassifierChain.
  

Check the log here