// check op and versioning.
  EXPECT_THAT(model_.operator_codes, SizeIs(2));
  EXPECT_THAT(GetBuiltinCode(model_.operator_codes[0].get()),
              Eq(BuiltinOperator_ADD));
  ASSERT_THAT(model_.operator_codes[0]->version, Eq(2));
  EXPECT_THAT(GetBuiltinCode(model_.operator_codes[1].get()),
              Eq(BuiltinOperator_RESHAPE));
  ASSERT_THAT(model_.operator_codes[1]->version, Eq(1));
}

        SubgraphName(set_implicit_main_func, e.index(), *subgraph);
    uint32_t subgraph_index = static_cast<uint32_t>(e.index());
    auto func_or_error = ConvertSubgraph(
        *subgraph, name, model->operator_codes, func_names, model->buffers,
        base_loc, builder,
        /*is_entry_point=*/
        set_implicit_main_func
            ? e.index() == 0
            : subgraph_to_signature_map.contains(subgraph_index),