private HNSet buildInputSet(int index) {

    return MethodsOverIndividuals.buildHNSet(
        geneticMiningMatrices.getStartMatrix().get(index),
        geneticMiningMatrices.getCausalMatrix().viewColumn(index),
        generator);
  }
 private HNSet buildOutputSet(int index) {
   return MethodsOverIndividuals.buildHNSet(
       geneticMiningMatrices.getEndMatrix().get(index),
       geneticMiningMatrices.getCausalMatrix().viewRow(index),
       generator);
 }