def _signature(self) -> str:
        """Generate the unique signature of the gemm op.

        Returns
        -------
        str
            The unique signature of the gemm op.
        """
        op_name = self._attrs["op"] + ("split_" + str(self._attrs["split_k"]))
        signature = sha1(op_name.encode("utf-8")).hexdigest()
        return signature
Generate the unique signature of the gemm op.

        Returns
        -------
        str
            The unique signature of the gemm op.
        
python/aitemplate/compiler/ops/gemm_universal/gemm_common.py