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- W52011011 abstract "A great deal of research has addressed the problem of generating optimal plans, but these plans are of limited use in circumstances where noisy sensors, unanticipated exogenous actions, or imperfect models result in discrepancies between predicted and observed states of the world during plan execution. Such discrepancies bring into question the continued optimality of the plan being executed and, according to current-day practice, are resolved by aborting the plan and replanning, often unnecessarily. In this paper we address the problem of monitoring the continued optimality of a given plan at execution time, in the face of such discrepancies. While replanning cannot be avoided when critical aspects of the environment change, our objective is to avoid replanning unnecessarily. We address the problem by building on practical approaches to monitoring plan validity. We begin by formalizing plan validity in the situation calculus and characterizing common approaches to monitoring plan validity. We then generalize this characterization to the notion of plan optimality and propose an algorithm that verifies continued plan optimality. We have implemented our algorithm and tested it on simulated execution failures in well-known planning domains. Experimental results yield a significant speedup in performance over the alternative of replanning, clearly demonstrating the merit of our approach." @default.
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- W52011011 date "2007-09-22" @default.
- W52011011 modified "2023-09-23" @default.
- W52011011 title "Monitoring plan optimality during execution" @default.
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