code: @Override
    protected Futures remove_impl(Futures fs) {
      if (trainingFrame != null && origTrainingFrame != null)
        Frame.deleteTempFrameAndItsNonSharedVecs(trainingFrame, origTrainingFrame);
      if (leaderboard != null) leaderboard.remove(fs);
      if (userFeedback != null) userFeedback.remove(fs);
      return super.remove_impl(fs);
    }
docs: Delete the AutoML-related objects, but leave the grids and models that it built.