code: def encode_world_info(world_info):
      world_info_json = json.dumps(world_info).encode("utf-8")
      world_info_base64 = base64.urlsafe_b64encode(
          world_info_json
      ).decode("utf-8")
      return world_info_base64
  
imports: import os
  import sys
  import json
  import base64
  import argparse
  import subprocess
  import collections
  from copy import deepcopy
  import signal
  import time
  import torch.cuda
  from .multinode_runner import PDSHRunner, OpenMPIRunner, MVAPICHRunner, SlurmRunner
  from .constants import PDSH_LAUNCHER, OPENMPI_LAUNCHER, MVAPICH_LAUNCHER, SLURM_LAUNCHER
  from ..constants import TORCH_DISTRIBUTED_DEFAULT_PORT
  from ..nebula.constants import NEBULA_EXPORT_ENVS
  from ..utils import logger
  from ..autotuning import Autotuner
label_desc: Use image node_id 6 for calling a global function with example usage: encode_world_info(world_info) and returns: world_info_base64