docs: public static INDArray output(Model model, INDArray input) {
  
          if (model instanceof MultiLayerNetwork) {
              final MultiLayerNetwork multiLayerNetwork = (MultiLayerNetwork) model;
              final INDArray output = multiLayerNetwork.output(input);
              return output;
          }
  
          if (model instanceof ComputationGraph) {
              final ComputationGraph computationGraph = (ComputationGraph) model;
              final INDArray output = computationGraph.outputSingle(input);
              return output;
          }
  
          final String message;
          if (model.getClass().getName().startsWith("org.deeplearning4j")) {
              message = model.getClass().getName() + " models are not yet supported and " +
                      "pull requests are welcome: https://github.com/deeplearning4j/deeplearning4j";
          } else {
              message = model.getClass().getName() + " models are unsupported.";
          }
  
          throw new UnsupportedOperationException(message);
      }