code: def test_subpg_all_gather_object(self):
      rank, ranks, my_pg = self.setup_sub_pg()
      out_list = [None] * len(ranks)
      dist.all_gather_object(out_list, rank, group=my_pg)
      self.assertEqual(ranks, out_list)
  
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 13 for calling the TestObjectCollectives obj's underlying member method code with example usage: obj.test_subpg_all_gather_object() without return types