code: def is_master():
      return get_rank() == 0
  
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 5 for calling a global function with example usage: is_master() and returns: unknown