code: def device(self):
      return (
          torch.device(self.rank)
          if BACKEND == dist.Backend.NCCL
          else torch.device("cpu")
      )
  
imports: import os
  import sys
  from functools import wraps, partial
  import torch
  import torch.distributed
  from torch.testing._internal.common_distributed import MultiProcessTestCase, TEST_SKIPS
  from torch.testing._internal.common_utils import run_tests, TEST_WITH_DEV_DBG_ASAN
label_desc: Use image node_id 2 for calling the TestObjectCollectives obj's underlying member method code with example usage: obj.device() and returns: unknown