code: def reduce_across_processes(val):
      t = torch.tensor(val, device="cuda")
      dist.barrier()
      dist.all_reduce(t)
      return t
  
imports: import datetime
  import os
  import time
  from collections import defaultdict, deque
  import torch
  import torch.distributed
  import torch.nn.functional
label_desc: Use image node_id 5 for calling a global function with example usage: reduce_across_processes(val) and returns: t