code: def reduce_from_all_processes(self):
      if not torch.distributed.is_available():
          return
      if not torch.distributed.is_initialized():
          return
      torch.distributed.barrier()
      torch.distributed.all_reduce(self.mat)
  
imports: from collections import defaultdict, deque
  import datetime
  import time
  import torch
  import torch.distributed
  import errno
  import os
label_desc: Use image node_id 5 for calling the ConfusionMatrix obj's underlying member method code with example usage: obj.reduce_from_all_processes() without return types