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Admissible Pruning Strategies based on plan minimality for Plan-Space Planning

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Proceedings of the Fourteenth International Joint Conference on Artificial Intelligence. Planning. Pages 1627-1634.

Abstract

Although plan-space planners have been shown to be flexible and efficient in plan generation. they do suffer from the problem of "looping" -- that is, they may spend an inordinate amount of time doing locally seemingly useful but globally useless refinements. In this paper. I review the anatomy of looping and argue that looping is intimately tied to the production of non-minimal solutions. I then propose two classes of admissible pruning techniques based on the notion of plan minimality. I show that the first one is admissible for planners which do not protect their establishments. but allow a precondition to be reestablished any number of times. The second one is admissible for planners which protect their establishments through causal links. I also discuss the complexity of the proposed pruning strategies, and their potential applications.

Subbarao Kambhampati. 1995. Admissible Pruning Strategies based on plan minimality for Plan-Space Planning. In Proceedings of the Fourteenth International Joint Conference on Artificial Intelligence, IJCAI-95. IJCAI, 1627–1634. https://ijcai.org/proceedings/1995/210
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