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Anytime heuristic search (2007)
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| Venue: | Journal of Artificial Intelligence Research (JAIR |
| Citations: | 62 - 3 self |
BibTeX
@ARTICLE{Hansen07anytimeheuristic,
author = {Eric A. Hansen and Rong Zhou},
title = {Anytime heuristic search},
journal = {Journal of Artificial Intelligence Research (JAIR},
year = {2007},
volume = {28},
pages = {267--297}
}
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Abstract
We describe how to convert the heuristic search algorithm A * into an anytime algorithm that finds a sequence of improved solutions and eventually converges to an optimal solution. The approach we adopt uses weighted heuristic search to find an approximate solution quickly, and then continues the weighted search to find improved solutions as well as to improve a bound on the suboptimality of the current solution. When the time available to solve a search problem is limited or uncertain, this creates an anytime heuristic search algorithm that allows a flexible tradeoff between search time and solution quality. We analyze the properties of the resulting Anytime A * algorithm, and consider its performance in three domains; sliding-tile puzzles, STRIPS planning, and multiple sequence alignment. To illustrate the generality of this approach, we also describe how to transform the memoryefficient search algorithm Recursive Best-First Search (RBFS) into an anytime algorithm. 1.
Keyphrases
anytime algorithm anytime heuristic search improved solution heuristic search anytime heuristic search algorithm flexible tradeoff strip planning approximate solution sliding-tile puzzle search problem current solution weighted search optimal solution solution quality multiple sequence alignment search time
