class_docstr: Sentencepiece tokenizer with tf.text interface.
docstr: Returns size of the vocabulary in Sentencepiece model.
code: def vocab_size(self):
      """Returns size of the vocabulary in Sentencepiece model."""
      return self._vocab_size
  
file_path: text/tensorflow_text/python/ops/fast_sentencepiece_tokenizer.py
imports: import tensorflow.compat.v2
  from tensorflow.python.ops.ragged import ragged_tensor
  from tensorflow_text.core.pybinds import pywrap_model_converter
  from tensorflow.python.framework import load_library
  from tensorflow.python.platform import resource_loader
label_desc: Use image node_id 4 for calling the FastSentencepieceTokenizer obj's underlying member method code with example usage: obj.vocab_size() and returns: self