A Theory of Heuristic Information in Game-Tree Search by Chun-Hung Tzeng PDF

By Chun-Hung Tzeng

ISBN-10: 3642613683

ISBN-13: 9783642613685

ISBN-10: 3642648126

ISBN-13: 9783642648120

Searching is a crucial method in so much AI platforms, specifically in these AI creation structures which includes a world database, a collection of construction ideas, and a regulate process. as a result of intractability of uninformed seek strategies, using heuristic details is important in so much looking strategies of AI structures. this crucial thought of heuristic informatioD is the crucial subject of this booklet. We first use the 8-puzzle and the sport tic-tac-toe (noughts and crosses) as examples to assist our dialogue. The 8-puzzle comprises 8 numbered movable tiles set in a three x three body. One cellphone of the body is empty in order that it truly is attainable to maneuver an adjoining numbered tile into the empty cellphone. Given tile configurations, preliminary and aim, an 8-puzzle challenge contains altering the preliminary configuration into the target configuration, as illustrated in Fig. 1.1. an answer to this challenge is a chain of strikes best from the preliminary configuration to the objective configuration, and an optimum answer is an answer having the smallest variety of strikes. now not all difficulties have recommendations; for instance, in Fig. 1.1, challenge 1 has many options whereas challenge 2 has no resolution at all.

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Suppose that Fi is a Borel subfield generated by the partition of a game space corresponding to a heuristic search. Then we treat Xi =EFJX) as an estimator of X. If {F;} is an increasing sequence of Borel subfields, then {Xi' F;} becomes a martingale. This means that X i + 1 is a more precise estimator of X than is Xi. Such a model for estimating random variables is discussed fully in Chap. 7. 5 Probabilistic Game Models and Game Values In this chapter we introduce a formal definition of a probabilistic game model for further theoretical study.

Thus, E. = 1, that is, the probability that MAX wins the game starting from a node of height n if both players use minimax optimal strategies. Since M 0 is the value at a terminal node, its expected value is the probability of 1 at the terminal node: Eo=p· Let n > 0 be an even integer. Then, M. is the minimax value of a MAX node; M. = 0 if and only if the minimax value of each successor of the node is zero. _1)b. That is, if n is even. Now let n > 0 be an odd integer. Then, M. is the minimax value of a MIN node; 46 Probabilistic Game Models and Game Values M n = 1 if and only if the minimax value of each successor of the node is one.

4 Average Propagation The conventional minimaxing process is the right way to combine values at a node if those values are actual minimax values. It is also the best way to combine values ifthe player's opinions ofthe values of previously analyzed positions do not change on later moves, that is, if those values can be treated as actual values. However, real game-playing programs reanalyze positions after each move is made and usually come up with slightly different opinions on the later analyses.

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A Theory of Heuristic Information in Game-Tree Search by Chun-Hung Tzeng


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