code: def world_size(self) -> int:
      return 2
  
imports: import shutil
  import tempfile
  from functools import wraps
  from typing import Any, Callable, Dict, Optional, Tuple
  import torch
  import torch.distributed
  import torch.distributed.checkpoint
  import torch.nn
  from torch.distributed.checkpoint._fsspec_filesystem import FsspecReader, FsspecWriter
  from torch.distributed.checkpoint.optimizer import load_sharded_optimizer_state_dict
  from torch.distributed.fsdp import FullyShardedDataParallel
  from torch.distributed.fsdp.fully_sharded_data_parallel import StateDictType
  from torch.testing._internal.common_distributed import requires_nccl, skip_if_lt_x_gpu
  from torch.testing._internal.common_utils import run_tests, TestCase
  from torch.testing._internal.distributed._shard.sharded_tensor import ShardedTensorTestBase, with_comms
label_desc: Use image node_id 1 for calling the TestFSSpecWithDist obj's underlying member method code with example usage: obj.world_size() and returns: int