code: public static String leafScoreFromDistribution(double[] classDistribution, Instances instances) {
          double sum = 0, maxCount = 0;
          int maxIndex = 0;
          if (classDistribution != null) {
              sum = Utils.sum(classDistribution);
              maxIndex = Utils.maxIndex(classDistribution);
              maxCount = classDistribution[maxIndex];
          }
          return instances.classAttribute().value(maxIndex);
      }
docs: Retrieves a String representing the score of the given class distribution.
  
  @param classDistribution The class distribution to calculate a score for.
  @param instances         The header {@link weka.core.Instances}.
  @return A String representing the score of the given class distribution.