code: def world_size(self):
      return 2
  
file_path: pytorch/test/distributed/fsdp/test_shard_utils.py
imports: import torch
  from torch.distributed.distributed_c10d import _get_default_group
  from torch.distributed.fsdp._shard_utils import _create_chunk_dtensor, _create_chunk_sharded_tensor
  from torch.testing._internal.common_fsdp import FSDPTest
  from torch.testing._internal.common_utils import run_tests
  from torch.testing._internal.distributed._tensor.common_dtensor import DTensorTestBase, skip_if_lt_x_gpu, with_comms
label_desc: Use image node_id 1 for calling the TestShardUtilsDistributedDTensor obj's underlying member method code with example usage: obj.world_size() and returns: int