code: def normalize(n, source_min, source_max, target_min=0, target_max=1):
      return (
          (n - source_min)
          * (target_max - target_min)
          / (source_max - source_min)
      ) + target_min
  
imports: import numpy
  import skimage.io
  import skimage.util
  import os
label_desc: Use image node_id 3 for calling a global function with example usage: normalize(n, source_min, source_max, target_min, target_max) and returns: unknown