code: public static void exportRocChartsToHtmlFile(ROC roc, File file) throws IOException {
          String rocAsHtml = rocChartToHtml(roc);
          FileUtils.writeStringToFile(file, rocAsHtml);
      }
docs: Given a {@link ROC} chart, export the ROC chart and precision vs. recall charts to a stand-alone HTML file
  @param roc  ROC to export
  @param file File to export to