Active Tuples-based Scheme for Bounding Posterior Beliefs
  The paper presents a scheme for computing lower and upper bounds on the
posterior marginals in Bayesian networks with discrete variables. Its power
lies in its ability to use any available scheme that bounds the probability of
evidence or posterior marginals and enhance its performance in an anytime
manner. The scheme uses the cutset conditioning principle to tighten existing
bounding schemes and to facilitate anytime behavior, utilizing a fixed number
of cutset tuples. The accuracy of the bounds improves as the number of used
cutset tuples increases and so does the computation time. We demonstrate
empirically the value of our scheme for bounding posterior marginals and
probability of evidence using a variant of the bound propagation algorithm as a
plug-in scheme.
