class_docstr: Mutator that filters out episodes that end in an utterance asking 'do you want to
  talk about ...'.
  
  This accounts for roughly 7k episodes.
class_docstr_tok: ["Mutator","that","filters","out","episodes","that","end","in","an","utterance","asking","'do","you","want","to","talk","about","...","'",".","This","accounts","for","roughly","7k","episodes","."]
code: def _filter_fn(self, message: Message) -> bool:
      utterances = message["text"].split("\n")
      return "do you want to talk about" not in utterances[-1].lower()
  
imports: from typing import Optional, List
  from parlai.core.params import ParlaiParser
  import os
  from parlai.core.opt import Opt
  from parlai.core.teachers import ParlAIDialogTeacher
  from parlai.core.mutators import register_mutator, ManyEpisodeMutator
  from parlai.tasks.bot_adversarial_dialogue.build import build_dialogue_datasets, build_human_safety_eval_dataset, build_human_nonadv_safety_eval_dataset, get_adversarial_dialogue_folder, get_human_safety_eval_folder, get_human_nonadv_safety_eval_folder
  import parlai.utils.logging
  from parlai.utils.io import PathManager
  from parlai.utils.misc import str_to_msg
  from parlai.tasks.dialogue_safety.agents import OK_CLASS, NOT_OK_CLASS
  from parlai.core.message import Message
  from parlai.utils.misc import warn_once
label_desc: Use image node_id 1 for calling the FilterWantToTalkAboutLabelsMutator obj's underlying member method code with example usage: obj._filter_fn(message) and returns: unknown