for (size_t i = 0; i < op->outputs()->size(); ++i) {
        if (op->outputs()->Get(i) == tensor_idx) {
          const uint32_t op_code_idx = op->opcode_index();
          *op_code = GetBuiltinCode(model->operator_codes()->Get(op_code_idx));
          return true;
        }
      }
    }
    return false;
  }
};

// Returns true if everything between the two graphs
// are identical except for name field.