import tensorflow as tf

`       See the top of the file for details.
    """
    with tf.variable_scope(scope, reuse=reuse):
        observations_ph = U.ensure_tf_input(make_obs_ph("observation"))
        stochastic_ph = tf.placeholder(tf.bool, (), name="stochastic")
        update_eps_ph = tf.placeholder(tf.float32, (), name="update_eps")

        eps = tf.get_variable("eps", (), initializer=tf.constant_initializer(0))
