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Formula-Based Probabilistic Inference
Proceedings of the 26th Conference on Uncertainty in Artificial Intelligence, PMLR R8:218-227, 2010.
Abstract
Computing the probability of a formula given the probabilities or weights associated with other formulas is a natural extension of logical infer- ence to the probabilistic setting. Surprisingly, this problem has received little attention in the lit- erature to date, particularly considering that it in- cludes many standard inference problems as spe- cial cases. In this paper, we propose two algo- rithms for this problem: formula decomposition and conditioning, which is an exact method, and formula importance sampling, which is an ap- proximate method. The latter is, to our knowl- edge, the first application of model counting to approximate probabilistic inference. Unlike con- ventional variable-based algorithms, our algo- rithms work in the dual realm of logical formu- las. Theoretically, we show that our algorithms can greatly improve efficiency by exploiting the structural information in the formulas. Empiri- cally, we show that they are indeed quite pow- erful, often achieving substantial performance gains over state-of-the-art schemes.