code: def vocab_size(self):
      return max(self.special_tokens_decoder.keys()) + 1
  
imports: import pickle
  from typing import List
  import numpy
  from nemo.collections.common.tokenizers.column_coder import ColumnCodes
  from nemo.collections.common.tokenizers.tokenizer_spec import TokenizerSpec
label_desc: Use image node_id 3 for calling the TabularTokenizer obj's underlying member method code with example usage: obj.vocab_size() and returns: unknown