code: def distort_img(x):
      x = tl.prepro.flip_axis(x, axis=1, is_random=True)
      x = tl.prepro.crop(x, wrg=28, hrg=28, is_random=True)
      return x
  
label_desc: Use image node_id 1 for calling a global function with example usage: distort_img(x) and returns: x