code: public void load(@NonNull List<File> featureFiles, @NonNull List<File> labelFiles) throws IOException {
          setFeatureStats(load(featureFiles));
          if (isFitLabel()) {
              setLabelStats(load(labelFiles));
          }
      }
docs: Load means and standard deviations from the file system
  
  @param featureFiles source files for features, requires 2 files per input, alternating mean and stddev files
  @param labelFiles   source files for labels, requires 2 files per output, alternating mean and stddev files