message: correctly access the vocab_size
diff: @@ -419,7 +419,7 @@ class TextVectorization(CombinerPreprocessingLayer):
  super(TextVectorization, self).adapt(preprocessed_inputs, reset_state)
  def get_vocabulary(self):
  - if self.vocab_size == 0:
  + if self._vocab_size == 0:
  return []
  keys, values = self._get_table_data()
  