code: def invoke_on_rank_and_broadcast_result(
      pg: dist.ProcessGroup,
      rank: int,
      func: Callable[..., T],
      *args: Any,
      **kwargs: Any,
  ) -> T:
      """
      Invokes a function on the designated rank and broadcasts the result to all
      members within the group.
  
      Example::
  
          id = invoke_on_rank_and_broadcast_result(pg, 0, allocate_id)
      """
      if pg.rank() == rank:
          res = func(*args, **kwargs)
          object_list = [res]
      else:
          object_list = [None]
      if pg.size() > 1:
          dist.broadcast_object_list(object_list, rank, group=pg)
      return cast(T, object_list[0])
  
imports: from functools import wraps
  from typing import Any, Callable, cast, Optional, TypeVar
  import torch.distributed
label_desc: Use image node_id 2 for calling a global function with example usage: invoke_on_rank_and_broadcast_result(pg, rank, func) and returns: cast