import tensorflow as tf


    for layer in range(self.config["contextualization_layers"]):
      with tf.variable_scope("layer_{}".format(layer)):
        with tf.variable_scope("fw_cell"):
          cell_fw = util.CustomLSTMCell(self.config["contextualization_size"], num_sentences, self.lstm_dropout)
        with tf.variable_scope("bw_cell"):
