code: public boolean invert(int id) {
      switch (id) {
        case EVALUATION_CC:
        case EVALUATION_ACC:
        case EVALUATION_KAPPA:
        case EVALUATION_MATTHEWS_CC:
        case EVALUATION_PRECISION:
        case EVALUATION_WEIGHTED_PRECISION:
        case EVALUATION_RECALL:
        case EVALUATION_WEIGHTED_RECALL:
        case EVALUATION_AUC:
        case EVALUATION_WEIGHTED_AUC:
        case EVALUATION_PRC:
        case EVALUATION_WEIGHTED_PRC:
        case EVALUATION_FMEASURE:
        case EVALUATION_WEIGHTED_FMEASURE:
        case EVALUATION_TRUE_POSITIVE_RATE:
        case EVALUATION_TRUE_NEGATIVE_RATE:
          return true;
        default:
          return false;
      }
    }
docs: Returns whether to negate the metric for sorting purposes.
  
  @param id		the metric id
  @return		true if to invert