code: def filter_chats(chats, return_flagged=False):
      chats = [
          c
          for c in chats
          if c["dialogue"] is not None and len(c["dialogue"]) > 0
      ]
      return [
          c
          for c in chats
          if (c["flagged_messages"] is not None) == return_flagged
      ]
  
imports: import random
  import io
  import os
  import json
  from parlai.utils.misc import msg_to_str
label_desc: Use image node_id 16 for calling a global function with example usage: filter_chats(chats, return_flagged) and returns: unknown