def get_weight_path(self, op: Operation) -> str:
        """
        Get the weight path for a constant operation.
        By default, the weight is saved in {weight_dir}/weight.bin
        """
        assert (
            op.op_type == "const"
        ), f"Expected op (op.name) be a const op. Got op_type of {op.op_type}."
        return os.path.join(self.weights_dir, _WEIGHTS_FILE_NAME)

        Get the weight path for a constant operation.
        By default, the weight is saved in {weight_dir}/weight.bin
        
coremltools/converters/mil/backend/mil/load.py