Revert changes in #270 due to revert decision in sklearn #273
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This PR reverts the changes introduced in #270. These changes were introduced to be compatible with changes in sklearn's
check_is_fitted
introduced in scikit-learn/scikit-learn#14545Since then the last release of sklearn reverted these changes as they were creating some problems, see scikit-learn/scikit-learn#15947
This avoids the hassle of checking Python version, and the need to have sklearn >= 0.22.0 for Python >= 3.5