code: public static MultiLayerNetwork loadCheckpointMLN(File rootDir, Checkpoint checkpoint) {
          return loadCheckpointMLN(rootDir, checkpoint.getCheckpointNum());
      }
docs: Load a MultiLayerNetwork for the given checkpoint that resides in the specified root directory
  
  @param rootDir    Root directory for the checkpoint
  @param checkpoint Checkpoint model to load
  @return The loaded model