code: def get_contexts(self):
      random.seed()
      personas_1 = random.choice(self.personas_list)
      personas_2 = random.choice(self.personas_list)
      return [personas_1, personas_2]
  
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 2 for calling the SelfChatWorld obj's underlying member method code with example usage: obj.get_contexts() and returns: list