code: public void revertLabels(@NonNull INDArray[] labels, INDArray[] maskArrays, int output) {
          NormalizerStrategy strategy = getStrategy(globalOutputStrategy, perOutputStrategies, output);
          if (strategy != null) {
              INDArray mask = (maskArrays == null ? null : maskArrays[output]);
              //noinspection unchecked
              strategy.revert(labels[output], mask, getOutputStats(output));
          }
      }
docs: Undo (revert) the normalization applied by this DataNormalization instance to the labels of a particular output
  
  @param labels     The normalized array of outputs
  @param maskArrays Optional mask arrays belonging to the outputs
  @param output     the index of the output to revert normalization on