code: def test_invertibility_on_random_strings(self):
      for _ in range(1000):
          s = "".join(
              six.unichr(random.randint(0, 65535)) for _ in range(10)
          )
          self.assertEqual(s, tokenizer.decode(tokenizer.encode(s)))
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import random
  import six
  from six.moves import range
  from tensor2tensor.data_generators import tokenizer
  import tensorflow.compat.v1
label_desc: Use image node_id 3 for calling the TokenizerTest obj's underlying member method code with example usage: obj.test_invertibility_on_random_strings() without return types