- Make `predict`, `predict_proba`, and `score` of
  :class:`neighbors.KNeighborsClassifier` and
  :class:`neighbors.RadiusNeighborsClassifier` accept `X=None` as input. In this case
  predictions for all training set points are returned, and points are not included
  into their own neighbors.
  By :user:`Dmitry Kobak <dkobak>`
