code: def classes_to_clusters(self):
          
          array = javabridge.call(self.jobject, "getClassesToClusters", "()[I")
          if array is None:
              return None
          else:
              return javabridge.get_env().get_int_array_elements(array)
docs: Return the array (ordered by cluster number) of minimum error class to cluster mappings.
  
          :return: the mappings
          :rtype: ndarray