protected double[] emptyPredictions(int numPredictions){
  double[] predictions=new double[numPredictions];
  Arrays.fill(predictions,Double.NaN);
  return predictions;
}

protected double [ ] emptyPredictions ( int numPredictions ) { double [ ] predictions = new double [ numPredictions ] ; Arrays . fill ( predictions , Double . NaN ) ; return predictions ; }
returns an empty set of predictions , filled with nans
