code: def num_rank_is_power_2(num_rank):
      """
      Tests if the given number of ranks is of power of 2. This check is required
      for Adasum allreduce.
      TODO support non-power of 2 ranks.
      """
      return num_rank != 0 and ((num_rank & (num_rank - 1)) == 0)
  
imports: import json
  import multiprocessing
  import os
  import sys
  import sysconfig
  import warnings
  from contextlib import contextmanager
  from horovod.common.exceptions import get_version_mismatch_message, HorovodVersionMismatchError
label_desc: Use image node_id 15 for calling a global function with example usage: num_rank_is_power_2(num_rank) and returns: unknown