Optimal-Generation Variants of EPEA

Meir Goldenberg, Ariel Felner, Nathan R. Sturtevant, Robert C. Holte, Jonathan Schaeffer
2013 Symposium on Combinatorial Search  
It is known that A* is optimal with respect to the expanded nodes (Dechter and Pearl 1985) (D&P). The exact meaning of this optimality varies depending on the class of algorithms and instances over which A* is claimed to be optimal. A* does not provide any optimality guarantees with respect to the generated nodes. However, such guarantees may be critical for optimally solving instances of domains with a large branching factor. In this paper, we introduce two new variants of the recently
more » ... ed Enhanced Partial Expansion A* algorithm (EPEA*) (Felner et al. 2012). We leverage the results of D&P to show that these variants possess optimality with respect to the generated nodes in much the same sense as A* possesses optimality with respect to the expanded nodes. The results in this paper are theoretical. A study of the practical performance of the new variants is beyond the scope of this paper.
dblp:conf/socs/GoldenbergFSHS13 fatcat:xqu4qwq7xja6rdwsb6frkcghgq