class_docstr: Runs end-to-end tokenization: punctuation splitting + wordpiece
class_docstr_tok: ["Runs","end-to-end","tokenization",":","punctuation","splitting","+","wordpiece"]
code: def tokenize(self, text):
      split_tokens = []
      for token in self.basic_tokenizer.tokenize(text):
          for sub_token in self.wordpiece_tokenizer.tokenize(token):
              split_tokens.append(sub_token)
      return split_tokens
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  import unicodedata
  import os
  import logging
  from .file_utils import cached_path
label_desc: Use image node_id 2 for calling the BertTokenizer obj's underlying member method code with example usage: obj.tokenize(text) and returns: split_tokens