AAAI Publications, Eleventh Annual Symposium on Combinatorial Search

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Does Fast Beat Thorough? Comparing RTAA* and LSS-LRTA*
Shane Kochvi, Wheeler Ruml

Last modified: 2018-07-02


The RTAA* algorithm has been proposed as an alternative to the LSS-LRTA* algorithm for heuristic search under hard time constraints. It uses a cruder but faster learning procedure. Experimental results on pathfinding in mazes in the unknown terrain setting indicated that RTAA* was superior to LSS-LRTA*. In this paper, we attempt to replicate those results and we extend the analysis to additional domains. Our results suggest that RTAA* is superior to LSS-LRTA* only in situations where the heuristic is already relatively accurate, either inherently or because of large lookahead. Overall, neither algorithm seems superior to the other.

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