D. Poole. Decision-theoretic defaults. In Proceedings of the Ninth Biennial Canadian Artificial Intelligence Conference, pages 190--197, 1992.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....aspect of defaults needed or useful to represent many domains. Bases for precedence information include not only specificity dominance but also reliability and authority of sources [Grosof, 1993] decision theoretic utility (e.g. rules about emergencies have higher precedence) Grosof, 1991] [Poole, 1992] , and temporal directionality (e.g. freshness; or Shoham s [1988] chronological minimization) 1.2 Virtues of Circumscription as a Focus Formalism Circumscription is a historically central and relatively wellstudied non monotonic formalism, with a number of attractive characteristics. First, ....

David Poole. Decision-theoretic defaults. In Proceedings of Canadian AI Conference (CSCSI-92), pages 190--197, Vancouver, B. C., May 1992.

....user in our setting allows such an assumption. In the concluding section we discuss qualitative ways around this problem. However, the scheme presented here has a certain naive appeal, which may be partly due to the observation that defaults are usually expressed with such considerations in mind [27, 25]. Furthermore, the scheme is conceptually simple in that it embodies a principle analogous to the separability of state estimation and control [11] An agent can calculate what is (probably) true of the world and subsequently and independently base its decisions upon these beliefs. Finally, our ....

David Poole. Decision-theoretic defaults. In Proceedings of Canadian Society for Computational Studies of Intelligence Conference, pages 190--197, Vancouver, 1992.

....B) A :B) A B) B A) C A) C B) for some C, where A B stands for the indicative conditional (defined by ( BjA) 0) It states that every dependence must have a causal explanation, either direct or indirect (via some common cause) 6. 3 Other Decision Theoretic Accounts Poole [16] has proposed a quantitative decisiontheoretic account of defaults, taking the utility of A, given evidence e, to be (Aje) Sigma ( A)P ( je) 37) This requires a specification of an action dependent preference function for each ( A) pair. Our proposal (in line with [21] attributes ....

Poole, D., "Decision-theoretic defaults," Ninth Canadian Conference on AI, Vancouver, Canada, 190-197, May 1992.

....not suggest 10 We do not address here the issue of how one determines appropriate acceptance rules. Below we show how such acceptance rules can interpreted in a very strong probabilistic way that guarantees this to be the case; but in general decision theoretic criteria should be brought to bear [24, 8]. 11 One example is using standard acceptance rules so that P A (B) k ensures that P (BjA) that this interpretation is the correct way to view Popper functions, but simply present it as an alternative to illustrate the feasibility of this point of view. Imagine an agent whose epistemic ....

David Poole. Decision-theoretic defaults. In Proceedings of Canadian Society for Computational Studies of Intelligence Conference, pages 190--197, Vancouver, 1992.

....aspect of defaults needed or useful to represent many domains. Bases for precedence information include not only specificity dominance but also reliability and authority of sources [Grosof, 1993] decision theoretic utility (e.g. rules about emergencies have higher precedence) Grosof, 1991] [Poole, 1992] , and temporal directionality (e.g. freshness; or Shoham s [1988] chronological minimization) 1.2 Virtues of Circumscription as a Focus Formalism Circumscription is a historically central and relatively wellstudied non monotonic formalism, with a number of attractive characteristics. First, ....

David Poole. Decision-theoretic defaults. In Proceedings of Canadian AI Conference (CSCSI-92), pages 190--197, Vancouver, B. C., May 1992.

....provided by this theory when formalizing our intuitions about decision making. It also provides common ground with other work that shares these tools. In particular, we examine the relation between our defaults and statements such if , than a is an optimal action that have been studied by Poole [ Poole, 1992 ] We combine the two types of statements in one framework, leading to a rich knowledge representation language. Because Poole s work shares the fundamental notions of decision theory, we can integrate his approach into our framework in a semantically clean way. Finally, decision theoretic ....

....(e.g. Langlotz et al. 1986 ] More recently, decision theoretic foundations for defaults were advocated by Shoham (1987) and Doyle (1989) Doyle provides a formal analysis of Pascal s wager and shows how an assumption (the existence of God) can be justified in terms of utility. Finally, Poole (1992) examined a concrete notion of defaults that are grounded in terms of decision theory. Unlike previous works (with the exception of [ Poole, 1992 ] see Section 3) we make decision theory the basis of a formal definition of defaults. This paper is organized as follows. In Section 1, we review the ....

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D. Poole. Decision theoretic defaults. In Proc. 8th Annual Conference on Uncertainty Artificial Intelligence (UAI '92), pp. 190--197. 1992.

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D. Poole. Decision-theoretic defaults. In Proceedings of the Ninth Biennial Canadian Artificial Intelligence Conference, pages 190--197, 1992.

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