code: def _encode_classes(self):
      class_names = sorted(self.CLASS_NAMES)
  
      for i, e in enumerate(class_names):
          self.class_to_idx[e] = i
          self.idx_to_class[i] = e
  
      self.create_lookup_table()
  
imports: import math
  import os
  import pathlib
  from glob import glob
  from typing import List, Optional, Union
  import matplotlib.pyplot
  import tensorflow
  from chitra.image.tf_image import read_image, resize_image
  from .core import remove_dsstore
  from .utility.tf_utils import get_basename
label_desc: Use image node_id 8 for calling the Clf obj's underlying member method code with example usage: obj._encode_classes() without return types