Prior work has shown that context-specific independence (CSI) in Bayes networks can be exploited to speed up belief updating. We examine how networks with variables exhibiting mutual exclusion (e.g. "selector variables"), as well as CSI, can be efficiently updated. In particular, singly-connected networks, that have an additional common selector variable, can be updated in linear time, where quadratic time would be needed without the mutual exclusion requirement. The above result has direct applications, as such network topologies can be used in predicting the ramifications of user selection in some multimedia systems.
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