code: def size(self):
      return len(self.vocab) // 2
  
imports: import tensorflow
  from tensorflow.contrib import rnn
  from tensorflow.python.ops import array_ops
  from ..models.basic_model import BasicModel
  import numpy
  import os
label_desc: Use image node_id 2 for calling the Vocabulary obj's underlying member method code with example usage: obj.size() and returns: unknown