code: def distributed_init(config):
      if config.distributed.world_size == 1:
          raise ValueError(
              "Cannot initialize distributed with distributed_world_size=1"
          )
      logger.info(f"XLA Mode:{is_xla()}")
  
      if is_xla():
          config.device_id = xm.get_local_ordinal()
          config.distributed.rank = xm.get_ordinal()
      elif dist.is_initialized():
          warnings.warn(
              "Distributed is already initialized, cannot initialize twice!"
          )
          config.distributed.rank = dist.get_rank()
      else:
          logger.info(
              f"Distributed Init (Rank {config.distributed.rank}): "
              f"{config.distributed.init_method}"
          )
  
          nccl_config = config.distributed.get("nccl", {})
  
          if nccl_config.get("nsocks_perthread", None):
              os.environ["NCCL_NSOCKS_PERTHREAD"] = str(
                  nccl_config["nsocks_perthread"]
              )
              logger.info(
                  f"NCCL_NSOCKS_PERTHREAD: {os.environ['NCCL_NSOCKS_PERTHREAD']}"
              )
  
          if nccl_config.get("socket_nthreads", None):
              os.environ["NCCL_SOCKET_NTHREADS"] = str(
                  nccl_config["socket_nthreads"]
              )
              logger.info(
                  f"NCCL_SOCKET_NTHREADS: {os.environ['NCCL_SOCKET_NTHREADS']}"
              )
  
          dist.init_process_group(
              backend=config.distributed.backend,
              init_method=config.distributed.init_method,
              world_size=config.distributed.world_size,
              rank=config.distributed.rank,
          )
          logger.info(
              f"Initialized Host {socket.gethostname()} as Rank "
              f"{config.distributed.rank}"
          )
  
          if (
              "MASTER_ADDR" not in os.environ
              or "MASTER_PORT" not in os.environ
          ):
              # Set for onboxdataloader support
              split = config.distributed.init_method.split("//")
              assert len(split) == 2, (
                  "host url for distributed should be split by '//' "
                  + "into exactly two elements"
              )
  
              split = split[1].split(":")
              assert (
                  len(split) == 2
              ), "host url should be of the form <host_url>:<host_port>"
              os.environ["MASTER_ADDR"] = split[0]
              os.environ["MASTER_PORT"] = split[1]
  
          # perform a dummy all-reduce to initialize the NCCL communicator
          dummpy_tensor = torch.zeros(1)
          dist.all_reduce(dummpy_tensor.cuda())
  
          suppress_output(is_main())
          config.distributed.rank = dist.get_rank()
      return config.distributed.rank
  
imports: import contextlib
  import logging
  import os
  import pickle
  import socket
  import subprocess
  import warnings
  from itertools import chain
  import torch
  from mmf.common.registry import registry
  from torch import distributed
label_desc: Use image node_id 18 for calling a global function with example usage: distributed_init(config) and returns: config