code: def format_chats(chat_list):
      if chat_list[0]["ds"] < "2020-06-24":
          return format_chats_orig(chat_list)
      else:
          return format_chats_june_2020(chat_list)
  
imports: import random
  import io
  import os
  import json
  from parlai.utils.misc import msg_to_str
label_desc: Use image node_id 14 for calling a global function with example usage: format_chats(chat_list) and returns: format_chats_orig, format_chats_june_2020