code: def refine_bound(ul, br):
      """Adjust bound"""
      ul[0] = min(ul[0], br[0] - 5)
      ul[1] = min(ul[1], br[1] - 5)
      br[0] = max(br[0], ul[0] + 5)
      br[1] = max(br[1], ul[1] + 5)
      return ul, br
  
imports: from __future__ import absolute_import
  from __future__ import division
  import math
  import random
  import numpy
  import mxnet
  from mxnet import nd, image
  from mxnet.gluon.data.vision import transforms
  from ...utils.filesystem import try_import_cv2
label_desc: Use image node_id 16 for calling a global function with example usage: refine_bound(ul, br) and returns: ul,  br