code: def vocab_size(self):
      # the +1 is because we add the blank id
      return self.vocab_len + 1
  
imports: import itertools
  import math
  from typing import Iterable, List, Optional, Tuple, Union
  import numpy
  import torch
  from nemo.collections.common.tokenizers.tokenizer_spec import TokenizerSpec
  from nemo.core.classes import NeuralModule, typecheck
  from nemo.core.neural_types import LengthsType, LogprobsType, NeuralType, PredictionsType
label_desc: Use image node_id 5 for calling the _TokensWrapper obj's underlying member method code with example usage: obj.vocab_size() and returns: unknown