class_docstr: Uses the checked sentence (knowledge) as label.
class_docstr_tok: ["Uses","the","checked","sentence","(","knowledge",")","as","label","."]
code: def checked_sentence_kword(self):
      return "checked_sentence"
  
imports: from parlai.core.mutators import register_mutator, MessageMutator, ManyEpisodeMutator
  from parlai.core.message import Message
  import parlai.tasks.wizard_of_internet.constants
  import random
label_desc: Use image node_id 1 for calling the CheckedSentenceAsLabel obj's underlying member method code with example usage: obj.checked_sentence_kword() and returns: str