code: def get_personas(opt, shared=None):
      if shared and "personas_list" in shared:
          return shared["personas_list"]
      return _load_personas(opt=opt)
  
imports: from typing import Optional
  from parlai.core.params import ParlaiParser
  from parlai.core.opt import Opt
  from parlai.core.worlds import create_task
  from parlai.agents.fixed_response.fixed_response import FixedResponseAgent
  from parlai.tasks.self_chat.worlds import SelfChatWorld
  from parlai.tasks.interactive.worlds import InteractiveWorld
  import random
label_desc: Use image node_id 1 for calling a global function with example usage: get_personas(opt, shared) and returns: _load_personas, shared