import tensorflow as tf

        if out_dim is not None:
            with tf.variable_scope(name) :
                self.gamma= tf.get_variable('gamma',[1,1,1,out_dim], initializer=tf.constant_initializer(1.0))
                self.beta = tf.get_variable('beta',[out_dim], initializer=tf.constant_initializer(0.0))
