docs: public void crossValidateSetSigma(GeneralDataset<L, F> dataset,int kfold) {
      System.err.println("##you are here.");
      crossValidateSetSigma(dataset, kfold, new MultiClassAccuracyStats<L>(MultiClassAccuracyStats.USE_LOGLIKELIHOOD), new GoldenSectionLineSearch(true, 1e-2, min, max));
    }