text: # -*- encoding:utf-8 -*-
  from __future__ import unicode_literals
  
  
  # Special token ids.
  PAD_ID = 0
  UNK_ID = 100
  CLS_ID = 101
  SEP_ID = 102
  MASK_ID = 103
  
  # Special token words.
  PAD_TOKEN = '[PAD]'
  UNK_TOKEN = '[UNK]'
  CLS_TOKEN = '[CLS]'
  SEP_TOKEN = '[SEP]'
  MASK_TOKEN = '[MASK]'
  