def set_tgt_lang_special_tokens(self, lang: str) -> None:
        """Reset the special tokens to the target lang setting.
        Prefix=[eos, tgt_lang_code] and suffix=[eos].
        """
        self.cur_lang_code = self.convert_tokens_to_ids(lang)
        self.init_kwargs["tgt_lang"] = lang

        if self.cur_lang_code == self.unk_token_id:
            logger.warning_once(
                f"`tgt_lang={lang}` has not be found in the vocabulary. Behaviour will probably be unexpected because the language token id will be replaced by the unknown token id."
            )

        self.prefix_tokens = [self.eos_token_id, self.cur_lang_code]
        self.suffix_tokens = [self.eos_token_id]
Reset the special tokens to the target lang setting.
        Prefix=[eos, tgt_lang_code] and suffix=[eos].
        
dpkd/transformers/src/transformers/models/seamless_m4t/tokenization_seamless_m4t.py