src/transformers/models/esm/tokenization_esm.py/EsmTokenizer/build_inputs_with_special_tokens
class EsmTokenizer:    def build_inputs_with_special_tokens(
        self, token_ids_0: List[int], token_ids_1: Optional[List[int]] = None
    ) -> List[int]:
        if token_ids_1 is None:
            return [self.cls_token_id] + token_ids_0 + [self.eos_token_id]
        cls = [self.cls_token_id]
        sep = [self.eos_token_id]  # No sep token in ESM vocabulary
        return cls + token_ids_0 + sep + token_ids_1 + sep