code: def gen_uid(cls, session_id: str):
      return f"{session_id}_svc_session_actor1"
  
file_path: mars/mars/services/tests/test_svcs/test_svc1/supervisor.py
imports: from .....None import oscar
  from ....core import AbstractService
label_desc: Use image node_id 1 for calling the SvcSessionActor1 obj's underlying member method code with example usage: obj.gen_uid(cls, session_id) and returns: session_id, str