code: def forward(self, sentences, question):
      self.register_all(sentences)
      a = self.query(question)
      return a
  
imports: import collections
  import json
  import os
  import numpy
  import six
  import chainer
  from chainer import backend
  import chainer.functions
  from chainer import initializers
  import chainer.links
  import babi
label_desc: Use image node_id 5 for calling the MemNN obj's underlying member method code with example usage: obj.forward(sentences, question) and returns: a