code: def _integ(img, r, c, rl, cl):
      r = _clip(r, 0, img.shape[0] - 1)
      c = _clip(c, 0, img.shape[1] - 1)
  
      r2 = _clip(r + rl, 0, img.shape[0] - 1)
      c2 = _clip(c + cl, 0, img.shape[1] - 1)
  
      ans = img[r, c] + img[r2, c2] - img[r, c2] - img[r2, c]
      return max(0, ans)
  
label_desc: Use image node_id 2 for calling a global function with example usage: _integ(img, r, c, rl, cl) and returns: max