docs: public void fit(@NonNull MultiDataSet dataSet) {
          List<S.Builder> featureNormBuilders = new ArrayList<>();
          List<S.Builder> labelNormBuilders = new ArrayList<>();
  
          fitPartial(dataSet, featureNormBuilders, labelNormBuilders);
  
          featureStats = buildList(featureNormBuilders);
          if (isFitLabel()) {
              labelStats = buildList(labelNormBuilders);
          }
      }