class_docstr: Splits a string into tokens, and joins them back.
class_docstr_tok: ["Splits","a","string","into","tokens",",","and","joins","them","back","."]
code: def save_to_file(self, filename_prefix):
      filename = self._filename(filename_prefix)
      kwargs = {
          "reserved_tokens": list(self._reserved_tokens),
          "alphanum_only": self._alphanum_only,
      }
      write_lines_to_file(type(self).__name__, filename, [], kwargs)
  
imports: from __future__ import unicode_literals
  import abc
  import hashlib
  import json
  import re
  from tensorflow_datasets.core.utils.lazy_imports_utils import tensorflow
label_desc: Use image node_id 7 for calling the Tokenizer obj's underlying member method code with example usage: obj.save_to_file(filename_prefix) without return types