import tensorflow as tf

      with tf.variable_scope("root", initializer=tf.constant_initializer(0.5)):
        enc_inp = [tf.constant(1, tf.int32, shape=[2]) for i in range(2)]
        dec_inp = [tf.constant(i, tf.int32, shape=[2]) for i in range(3)]
        cell = tf.nn.rnn_cell.BasicLSTMCell(2, state_is_tuple=True)
