def set_src_lang_special_tokens(self, src_lang) -> None:
        """Reset the special tokens to the source lang setting. No prefix and suffix=[eos, src_lang_code]."""
        self.cur_lang_code = self.lang_code_to_id[src_lang]
        self.prefix_tokens = []
        self.suffix_tokens = [self.eos_token_id, self.cur_lang_code]
Reset the special tokens to the source lang setting. No prefix and suffix=[eos, src_lang_code].
dpkd/transformers/src/transformers/models/mbart/tokenization_mbart.py