code: def mycmp(x, y):
      return cmp(x[1], y[1])
  
imports: import sys
  from past.builtins import cmp
  import skimage.io
  import skimage.feature
  import skimage.color
  import skimage.transform
  import skimage.util
  import skimage.segmentation
  import numpy
label_desc: Use image node_id 13 for calling a global function with example usage: mycmp(x, y) and returns: cmp