docs: public static Evaluation getEvaluation(ComputationGraph model, MultiDataSetIterator testData) {
          if (model.getNumOutputArrays() != 1)
              throw new IllegalStateException("GraphSetSetAccuracyScoreFunction cannot be "
                              + "applied to ComputationGraphs with more than one output. NumOutputs = "
                              + model.getNumOutputArrays());
  
          return model.evaluate(testData);
      }