code: def check_diff_to_scalar(A, x, rank=None):
      """assert A == x"""
      assert np.sum(np.abs((A - x).asnumpy())) == 0, (
          rank,
          A.asnumpy(),
          x,
      )
  
file_path: mxnet/tests/nightly/dist_device_sync_kvstore_byteps.py
imports: import sys
  import mxnet
  import numpy
  import numpy.random
  import time
  import argparse
  from mxnet.log import get_logger
  import logging
  from mxnet.kvstore import BytePS
label_desc: Use image node_id 1 for calling a global function with example usage: check_diff_to_scalar(A, x, rank) without return types