'Report the spending so far.
Args:
sess: the session to run the tensor.
target_eps: the target epsilon. Unused.
Returns:
the list containing a single EpsDelta, with values as Python floats (as
opposed to numpy.float64). This is to be consistent with
MomentAccountant which can return a list of (eps, delta) pair.'

def get_privacy_spent(self, sess, target_eps=None):

    unused_target_eps = target_eps
    (eps_squared_sum, delta_sum) = sess.run([self._eps_squared_sum, self._delta_sum])
    return [EpsDelta(math.sqrt(eps_squared_sum), float(delta_sum))]
