code: def map_uni_to_alphanum(uni):
      """Maps [0-9 A-Z a-z] to numbers 0-62."""
      if 48 <= uni <= 57:
          return uni - 48
      elif 65 <= uni <= 90:
          return uni - 65 + 10
      return uni - 97 + 36
  
imports: import io
  import numpy
  from PIL import Image
  from six.moves import zip_longest
  from skimage import draw
  import tensorflow.compat.v1
label_desc: Use image node_id 2 for calling a global function with example usage: map_uni_to_alphanum(uni) and returns: unknown, unknown, unknown