- Using `_estimator_type` to set the estimator type is deprecated. Inherit from
  :class:`~sklearn.base.ClassifierMixin`, :class:`~sklearn.base.RegressorMixin`,
  :class:`~sklearn.base.TransformerMixin`, or :class:`~sklearn.base.OutlierMixin`
  instead. Alternatively, you can set `estimator_type` in :class:`~sklearn.utils.Tags`
  in the `__sklearn_tags__` method.
  By `Adrin Jalali`_
