code: def gen_uid(cls, process_index: int):
      return f"process_info_{process_index}"
  
file_path: mars/mars/services/cluster/procinfo.py
imports: import asyncio
  import sys
  import threading
  import traceback
  from typing import Dict, List
  from ...None import oscar
  from ...oscar.backends.allocate_strategy import ProcessIndex
label_desc: Use image node_id 2 for calling the ProcessInfoActor obj's underlying member method code with example usage: obj.gen_uid(cls, process_index) and returns: str, process_index