code: def setup_sub_pg(self):
      rank = dist.get_rank()
      base_rank = rank - (rank % 2)
      ranks = [base_rank, base_rank + 1]
      my_pg = dist.new_group(ranks, use_local_synchronization=True)
      return rank, ranks, my_pg
  
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 11 for calling the TestObjectCollectives obj's underlying member method code with example usage: obj.setup_sub_pg() and returns: rank,  ranks,  my_pg