Finding Priorities of Circumscription Policy as a Skeptical Explanation in Abduction

Toshiko WAKAKI  Ken SATOH  Katsumi NITTA  Seiichiro SAKURAI  

IEICE TRANSACTIONS on Information and Systems   Vol.E81-D   No.10   pp.1111-1119
Publication Date: 1998/10/25
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Artificial Intelligence and Cognitive Science
skeptical explanations,  abductive framework,  circumscription policy,  parallel circumscription,  prioritized circumscription,  abductive logic programming,  extended logic programs,  answer set semantics,  

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In the commonsense reasoning, priorities among rules are often required to be found out in order to derive the desired conclusion as a theorem of the reasoning. In this paper, first we present the bottom-up and top-down abduction procedures to compute skeptical explanations and secondly show that priorities of circumscription to infer a desired theorem can be abduced as a skeptical explanation in abduction. In our approach, the required priorities can be computed based on the procedure to compute skeptical explanations provided in this paper as well as Wakaki and Satoh's method of compiling circumscription into extended logic programs. The method, for example, enables us to automatically find the adequate priority w. r. t. the Yale Shooting Problem to express a human natural reasoning in the framework of circumscription.