code: def default_uid(cls):
      return SupervisorLocatorActor.__name__
  
file_path: mars/mars/services/cluster/worker/locator.py
imports: import logging
  from typing import List
  from ....None import oscar
  from ..core import NodeRole, NodeStatus
  from ..locator import SupervisorLocatorActor
label_desc: Use image node_id 2 for calling the WorkerSupervisorLocatorActor obj's underlying member method code with example usage: obj.default_uid(cls) and returns: SupervisorLocatorActor