code: def resize_max(img, max_side):
      
      h, w = img.shape[:2]
      if h > w:
          nh = max_side
          nw = w * (nh / h)
      else:
          nw = max_side
          nh = h * (nw / w)
  
      return cv.resize(img, (nw, nh))
docs: Resize the image to threshold the maximum dimension within max_side
      :param img:
      :param max_side: Length of the maximum height or width
      :return: