def set_tgt_lang_special_tokens(self, lang: str) -> None:
        """Reset the special tokens to the target language setting. No prefix and suffix=[eos, tgt_lang_code]."""
        lang = self._convert_lang_code_special_format(lang)

        self.cur_lang_code = self.lang_code_to_id[lang] if lang is not None else None
        self.prefix_tokens = []
        if self.cur_lang_code is not None:
            self.suffix_tokens = [self.eos_token_id, self.cur_lang_code]
        else:
            self.suffix_tokens = [self.eos_token_id]
Reset the special tokens to the target language setting. No prefix and suffix=[eos, tgt_lang_code].
dpkd/transformers/src/transformers/models/plbart/tokenization_plbart.py