code: def __call__(self, img):
      if self.factor == 0:
          return img
      src_h, src_w = img.shape[:2]
      cur_w, cur_h = self.base_w, self.base_h
      scale_img = cv2.resize(
          img, (cur_w, cur_h), interpolation=get_interpolation()
      )
      for _ in range(self.factor):
          scale_img = cv2.pyrDown(scale_img)
      scale_img = cv2.resize(
          scale_img, (src_w, src_h), interpolation=get_interpolation()
      )
      return scale_img
  
imports: import math
  import numbers
  import random
  import cv2
  import numpy
  from paddle.vision.transforms import Compose, ColorJitter
label_desc: Use image node_id 2 for calling the CVRescale obj's underlying member method code with example usage: obj.__call__(img) and returns: scale_img, img