src/transformers/models/mbart50/tokenization_mbart50.py/MBart50Tokenizer/set_tgt_lang_special_tokens
class MBart50Tokenizer:    def set_tgt_lang_special_tokens(self, tgt_lang: str) -> None:
        """Reset the special tokens to the target language setting. prefix=[tgt_lang_code] and suffix=[eos]."""
        self.cur_lang_code_id = self.lang_code_to_id[tgt_lang]
        self.prefix_tokens = [self.cur_lang_code_id]
        self.suffix_tokens = [self.eos_token_id]