code: public static ComputationGraphConfiguration importKerasModelConfiguration(String modelJsonFilename)
              throws IOException, InvalidKerasConfigurationException, UnsupportedKerasConfigurationException {
          KerasModel kerasModel = new KerasModel().modelBuilder().modelJsonFilename(modelJsonFilename)
                  .enforceTrainingConfig(false).buildModel();
          return kerasModel.getComputationGraphConfiguration();
      }
docs: Load Keras (Functional API) Model for which the configuration was saved
  separately using calls to model.to_json() and model.save_weights(...).
  
  @param modelJsonFilename path to JSON file storing Keras Model configuration
  @return ComputationGraph
  @throws IOException IO exception
  @see ComputationGraph