code: def get_external_address(self, process_index: int) -> str:
      return self._conf["pools"][process_index]["external_address"][0]
  
file_path: mars/mars/oscar/backends/config.py
imports: from typing import Union, List, Dict, Any
label_desc: Use image node_id 5 for calling the ActorPoolConfig obj's underlying member method code with example usage: obj.get_external_address(process_index) and returns: self