docs: public static int numExamplesTrain(Set dataSet) {
          switch (dataSet) {
              case COMPLETE:
                  return NUM_COMPLETE_TRAIN;
              case MERGE:
                  return NUM_MERGE_TRAIN;
              case BALANCED:
                  return NUM_BALANCED_TRAIN;
              case LETTERS:
                  return NUM_LETTERS_TRAIN;
              case DIGITS:
                  return NUM_DIGITS_TRAIN;
              case MNIST:
                  return NUM_MNIST_TRAIN;
              default:
                  throw new UnsupportedOperationException("Unknown Set: " + dataSet);
          }
      }