code: def area_of(left_top, right_bottom):
      hw = np.clip(right_bottom - left_top, 0.0, None)
      return hw[..., 0] * hw[..., 1]
  
file_path: PaddleHub/modules/image/face_detection/ultra_light_fast_generic_face_detector_1mb_640/processor.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import time
  import base64
  import cv2
  import numpy
label_desc: Use image node_id 2 for calling a global function with example usage: area_of(left_top, right_bottom) and returns: unknown