src/transformers/models/splinter/tokenization_splinter.py/SplinterTokenizer/question_token_id
class SplinterTokenizer:    def question_token_id(self):
        """
        `Optional[int]`: Id of the question token in the vocabulary, used to condition the answer on a question
        representation.
        """
        return self.convert_tokens_to_ids(self.question_token)