code: def adjust_saturation(image, factor):
      """Adjust saturation of an image.
  
      Args
          image: Image to adjust.
          factor: An interval for the factor multiplying the saturation values of each pixel.
      """
      image[..., 1] = np.clip(image[..., 1] * factor, 0, 255)
      return image
  
imports: from __future__ import division
  import numpy
  import cv2
  from PIL import Image
  from .transform import change_transform_origin
label_desc: Use image node_id 14 for calling a global function with example usage: adjust_saturation(image, factor) and returns: image