code: def is_primary() -> bool:
      """
      Returns True if this is rank 0 of a distributed training job OR if it is
      a single trainer job. Otherwise False.
      """
      return get_rank() == _PRIMARY_RANK
  
imports: import io
  import tempfile
  from typing import Any, Callable, List, Tuple
  import torch
label_desc: Use image node_id 4 for calling a global function with example usage: is_primary() and returns: unknown