Method is_subgraph

bmf/engine/c_engine/src/loader/py_module_loader.cpp:163–166

    }

    bool is_subgraph() override {
        py::gil_scoped_acquire gil;
        return py::cast<bool>(call_func("is_subgraph"));
    }

    bool get_graph_config(JsonParam &json_param) override {
        return guard_call<int32_t>([&]() {