code: def next_rendezvous(self) -> Tuple[Store, int, int]:
      raise NotImplementedError()
  
imports: from typing import Any, Dict, SupportsInt, Tuple, cast
  from unittest import TestCase
  from torch.distributed import Store
  from torch.distributed.elastic.rendezvous import RendezvousHandler, RendezvousHandlerRegistry, RendezvousParameters
label_desc: Use image node_id 3 for calling the _DummyRendezvousHandler obj's underlying member method code with example usage: obj.next_rendezvous() without return types