text: import tensorflow as tf
  from models.stacked_bidirectional import StackedBidirectional
  
  
  class LstmStackedBidirectional(StackedBidirectional):
      def __init__(self, review_summary_file, checkpointer, num_layers, attention=False):
          """
  
          :param review_summary_file:
          :param checkpointer:
          :param num_layers:
          :param attention:
          """
          super(LstmStackedBidirectional, self).__init__(review_summary_file, checkpointer, num_layers, attention)
  
      def get_cell(self):
          """
          Return the atomic RNN cell type used for this model
          
          :return: The atomic RNN Cell
          """
          return tf.nn.rnn_cell.LSTMCell(self.memory_dim)
  