code: def ddp_barrier():
      """In DDP mode, this function will synchronize all processes.
      torch.distributed.barrier() will block processes until the whole
      group enters this function.
      """
      # Check if we're in a single-threaded section, skip barrier
      if MAIN_PROC_ONLY >= 1:
          return
      elif torch.distributed.is_initialized():
          torch.distributed.barrier()
  
file_path: speechbrain/speechbrain/utils/distributed.py
imports: import datetime
  import os
  import torch
  from functools import wraps
label_desc: Use image node_id 4 for calling a global function with example usage: ddp_barrier() without return types