code: def barrier() -> None:
      """
      Wrapper over torch.distributed.barrier, returns without waiting
      if the distributed process group is not initialized instead of throwing error.
      """
      if (
          not torch.distributed.is_available()
          or not torch.distributed.is_initialized()
      ):
          return
      torch.distributed.barrier()
  
imports: import io
  import tempfile
  from typing import Any, Callable, List, Tuple
  import torch
label_desc: Use image node_id 13 for calling a global function with example usage: barrier() without return types