const auto& op1 = subgraph->operators[1].get();
  const auto& op2 = subgraph->operators[2].get();
  const auto& op3 = subgraph->operators[3].get();
  const auto& op4 = subgraph->operators[4].get();

  ASSERT_THAT(GetBuiltinCode(model_.operator_codes[op1->opcode_index].get()),
              Eq(BuiltinOperator_QUANTIZE));
  ASSERT_THAT(GetBuiltinCode(model_.operator_codes[op2->opcode_index].get()),
              Eq(BuiltinOperator_QUANTIZE));