return true;
        }
      }
    }
    return false;
  }

  // Returns the producer op code of the specified tensor_idx.
  bool GetProducerOpCode(const Model* model, uint32_t subgraph_idx,
                         uint32_t tensor_idx, BuiltinOperator* op_code) {
    const auto subgraph = model->subgraphs()->Get(subgraph_idx);