code: def __len__(self):
      return self.vocab_size
  
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 2 for calling the TabularTokenizer obj's underlying member method code with example usage: obj.__len__() and returns: self