code: def single_or_rankzero():
      return (
          not _current_communicator or _current_communicator.rank == 0
      )
  
imports: import os
  import nnabla.communicators
  from nnabla.logger import logger
label_desc: Use image node_id 3 for calling a global function with example usage: single_or_rankzero() and returns: unknown