Efficient Single Frontier Bidirectional Search

Proceedings of the International Symposium on Combinatorial Search, 5

Volume

Vol. 5 No. 1 (2012): Fifth Annual Symposium on Combinatorial Search

Full Papers

The Single Frontier Bi-Directional Search (SBS) framework was recently introduced. A node in SBS corresponds to a pair of states, one from each of the frontiers and it uses front-to- front heuristics. In this paper we present an enhanced version of SBS, called eSBS, where pruning and caching techniques are applied, which significantly reduce both time and memory needs of SBS. We then present a hybrid of eSBS and IDA∗ which potentially uses only the square root of the memory required by A∗ but enables to prune many nodes that IDA∗ would generate. Experimental results show the benefit of our new approaches on a number of domains.

10.1609/socs.v3i1.18248