code: def all_reduce(x: torch.Tensor):
      if get_world_size() > 1:
          # reduce with a sum
          torch.distributed.all_reduce(x, group=_GROUP)
  
file_path: xformers/examples/llama_inference/mp_utils.py
imports: import functools
  import os
  from typing import Optional
  import torch
  from torch.distributed import ProcessGroup
label_desc: Use image node_id 5 for calling a global function with example usage: all_reduce(x) without return types