code: public KerasSequentialModel buildSequential()
              throws IOException, InvalidKerasConfigurationException, UnsupportedKerasConfigurationException {
          KerasSequentialModel sequentialModel = new KerasSequentialModel(this);
          close();
          return sequentialModel;
      }
docs: Build a KerasSequentialModel (corresponding to MultiLayerNetwork) from this model builder.
  
  @return KerasSequentialModel
  @throws IOException I/O exception
  @throws InvalidKerasConfigurationException Invalid configuration
  @throws UnsupportedKerasConfigurationException Unsupported configuration