code: def flip_down(img):
      # print 'flip_down'
      new_img = img.transpose(Image.FLIP_TOP_BOTTOM)
      return new_img
  
imports: from __future__ import division
  from builtins import range
  from builtins import object
  import random
  import numpy
  from PIL import Image, ImageEnhance
  import math
label_desc: Use image node_id 10 for calling a global function with example usage: flip_down(img) and returns: new_img