code: def test_save_load(self):
      tokenizer = XLNetTokenizer.load(self.tmp_dir.name)
  
      before_tokens = tokenizer.map_text_to_id(
          "He is very happy, UNwant\u00E9d,running"
      )
  
      with tempfile.TemporaryDirectory() as tmpdirname:
          tokenizer.save(tmpdirname)
          tokenizer = tokenizer.load(tmpdirname)
  
      after_tokens = tokenizer.map_text_to_id(
          "He is very happy, UNwant\u00E9d,running"
      )
      self.assertListEqual(before_tokens, after_tokens)
  
imports: import os
  import pickle
  import tempfile
  import tensorflow
  from texar.tf.data.data_utils import maybe_download
  from texar.tf.data.tokenizers.xlnet_tokenizer import XLNetTokenizer, SPIECE_UNDERLINE
  from texar.tf.utils.test import pretrained_test
label_desc: Use image node_id 6 for calling the XLNetTokenizerTest obj's underlying member method code with example usage: obj.test_save_load() without return types