code: def preserve_token(token, vocab):
      """Returns True if the token should forgo tokenization and be preserved."""
      if not FLAGS.preserve_unused_tokens:
          return False
      if token not in vocab:
          return False
      return bool(_UNUSED_TOKEN_RE.search(token))
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  import re
  import unicodedata
  from absl import flags
  import six
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling a global function with example usage: preserve_token(token, vocab) and returns: bool, False, False