How to use the rpyc.core.netref.class_factory function in rpyc

def _netref_factory(self, oid, clsname, modname):
        typeinfo = (clsname, modname)
        if typeinfo in self._netref_classes_cache:
            cls = self._netref_classes_cache[typeinfo]
        elif typeinfo in netref.builtin_classes_cache:
            cls = netref.builtin_classes_cache[typeinfo]
        else:
            info = self.sync_request(consts.HANDLE_INSPECT, oid)
            cls = netref.class_factory(clsname, modname, info)
            self._netref_classes_cache[typeinfo] = cls
        return cls(weakref.ref(self), oid)

def _netref_factory(self, oid, clsname, modname):
        typeinfo = (clsname, modname)
        if typeinfo in self._netref_classes_cache:
            cls = self._netref_classes_cache[typeinfo]
        elif typeinfo in netref.builtin_classes_cache:
            cls = netref.builtin_classes_cache[typeinfo]
        else:
            info = self.sync_request(consts.HANDLE_INSPECT, oid)
            cls = netref.class_factory(clsname, modname, info)
            self._netref_classes_cache[typeinfo] = cls
        return cls(weakref.ref(self), oid)

def _netref_factory(self, oid, clsname, modname):
        typeinfo = (clsname, modname)
        if typeinfo in self._netref_classes_cache:
            cls = self._netref_classes_cache[typeinfo]
        elif typeinfo in netref.builtin_classes_cache:
            cls = netref.builtin_classes_cache[typeinfo]
        else:
            info = self.sync_request(consts.HANDLE_INSPECT, oid)
            cls = netref.class_factory(clsname, modname, info)
            self._netref_classes_cache[typeinfo] = cls
        return cls(weakref.ref(self), oid)

def _netref_factory(self, id_pack):  # boxing
        """id_pack is for remote, so when class id fails to directly match """
        cls = None
        if id_pack[2] == 0 and id_pack in self._netref_classes_cache:
            cls = self._netref_classes_cache[id_pack]
        elif id_pack[0] in netref.builtin_classes_cache:
            cls = netref.builtin_classes_cache[id_pack[0]]
        if cls is None:
            # in the future, it could see if a sys.module cache/lookup hits first
            cls_methods = self.sync_request(consts.HANDLE_INSPECT, id_pack)
            cls = netref.class_factory(id_pack, cls_methods)
            if id_pack[2] == 0:
                # only use cached netrefs for classes
                # ... instance caching after gc of a proxy will take some mental gymnastics
                self._netref_classes_cache[id_pack] = cls
        return cls(self, id_pack)