import tensorflow as tf


        else:
            if activation == 'linear':
                cell_basic = tf.contrib.rnn.BasicRNNCell(state_size,activation=tf.identity)
                cell_drop=tf.contrib.rnn.DropoutWrapper(cell_basic,variational_recurrent=True,dtype=tf.float32, input_size=num_input,input_keep_prob=input_prob,state_keep_prob=state_prob)

