class_docstr: Character vocab with its additonal special tokens.
class_docstr_tok: ["Character","vocab","with","its","additonal","special","tokens","."]
code: def __init__(self, word_delim="<space>", **kwargs):
      super().__init__(**kwargs)
      self.word_delim = word_delim
      self.bow_index = self.add_symbol("<bow>")
      self.eow_index = self.add_symbol("<eow>")
      self.word_delim_index = self.add_symbol(word_delim)
      self.nspecial += 3
  
imports: import os
  import re
  from typing import Dict, List, Optional, Set
  from fairseq.data import dictionary
  from fairseq.file_io import PathManager
  from pytorch_translate import vocab_constants
label_desc: Use image node_id 1 to create a new CharDictionary object from inherited base classes: Dictionary with example: obj = CharDictionary(word_delim)