code: def pad_code(self):
      return self.vocab["PAD"]
  
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 5 for calling the Vocabulary obj's underlying member method code with example usage: obj.pad_code() and returns: self