docstr: Override to return a pair of contexts with which to seed the self chat episode.
  
  This function will be called before the first turn of every episode.
docstr_tok: ["Override","to","return","a","pair","of","contexts","with","which","to","seed","the","self","chat","episode",".","This","function","will","be","called","before","the","first","turn","of","every","episode","."]
code: def get_contexts(self):
      """
      Override to return a pair of contexts with which to seed the self chat episode.
  
      This function will be called before the first turn of every episode.
      """
      return ["Hi!", ""]
  
imports: import copy
  import random
  from typing import Any, Dict, List, Optional
  from parlai.agents.fixed_response.fixed_response import FixedResponseAgent
  from parlai.core.agents import Agent
  from parlai.core.worlds import create_task, DialogPartnerWorld, validate
  from parlai.core.message import Message
label_desc: Use image node_id 3 for calling the SelfChatWorld obj's underlying member method code with example usage: obj.get_contexts() and returns: list