code: def rel_levenshtein(s1, s2):
      """Relative Levenshtein distance taking its upper bound into consideration and return a value in [0, 1]"""
      maxlen = max(len(s1), len(s2))
      if maxlen > 0:
          return levenshtein(s1, s2) / float(maxlen)
      else:
          return 0
  
imports: import xml.etree.ElementTree
  from collections import OrderedDict
  import json
  import struct
  import imghdr
  import numpy
  from .geom import pt, rect
label_desc: Use image node_id 9 for calling a global function with example usage: rel_levenshtein(s1, s2) and returns: unknown, int