code: def get_model(self):
          '''
          `object` of model as a function approximator,
          which has `lstm_model` whose type is `pydbm.rnn.lstm_model.LSTMModel`.
          '''
          class Model(object):
              def __init__(self, lstm_model):
                  self.lstm_model = lstm_model
          return Model(self.__lstm_modelf get_model(self):
          '''
          `object` of model as a function approximator,
          which has `lstm_model` whose type is `pydbm.rnn.lstm_model.LSTMModel`.
          '''
          class Model(object):
              def __init__(self, lstm_model):
                  self.lstm_model = lstm_model
          return Model(self.__lstm_model)
docs: `object` of model as a function approximator,
          which has `lstm_model` whose type is `pydbm.rnn.lstm_model.LSTMModel`.