code: def get_3rd_point(a, b):
      direct = a - b
      return b + np.array([-direct[1], direct[0]], dtype=np.float32)
  
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 6 for calling a global function with example usage: get_3rd_point(a, b) and returns: unknown