code: public static MultiLayerNetwork loadCheckpointMLN(File rootDir, int checkpointNum){
          File f = getFileForCheckpoint(rootDir, checkpointNum);
          try {
              return ModelSerializer.restoreMultiLayerNetwork(f, true);
          } catch (IOException e){
              throw new RuntimeException(e);
          }
      }
docs: Load a MultiLayerNetwork for the given checkpoint number
  
  @param rootDir       The directory that the checkpoint resides in
  @param checkpointNum Checkpoint model to load
  @return The loaded model