[ENH] fix side effects in check_estimator utility
#2597
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fkiraly
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module:tests
chrisholder
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May 2, 2022
lmmentel
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The
check_estimatorutility can test estimator instances, which is useful to test specific hyper-parameter settings.Unfortunately, this had side effects on the passed estimator - which was used in testing throughout - and would break if the estimator was already fitted.
This PR fixes that issue by passing a clone and not the reference to the testing framework, in
run_tests.