docs: def is_probabilistic_classifier(clf):
      # type: (Any) -> bool
      """ Return True if a classifier can return probabilities """
      if not hasattr(clf, 'predict_proba'):
          return False
      if isinstance(clf, OneVsRestClassifier):
          # It currently has a predict_proba method, but does not check if
          # wrapped estimator has a predict_proba method.
          return hasattr(clf.estimator, 'predict_proba')
      return True