Masashi Sode

Results 2 issues of Masashi Sode

use convergence calculation of the entropy instead of `max_iter`.

enhancement

Inherit [_BaseKFold](https://github.com/scikit-learn/scikit-learn/blob/0fb307bf39bbdacd6ed713c00724f8f871d60370/sklearn/model_selection/_split.py#L269) in MCSKFold to unify the interface.

enhancement