code: def _create_rnn_cells(self):
          
          lstm_cell = tf.nn.rnn_cell.LSTMCell(
              self.num_hidden, forget_bias=0.0)
          lstm_cell = tf.nn.rnn_cell.DropoutWrapper(
              lstm_cell, output_keep_prob=self.dropout)
          self.cell = tf.nn.rnn_cell.MultiRNNCell(
              [lstm_cell] * self.num_layers)
docs: Create the LSTM cells.