On Transposition Tables for Single-Agent Search and Planning: Summary of Results
DOI:
https://doi.org/10.1609/socs.v1i1.18164Keywords:
IDA*, transposition table, admissibility, completenessAbstract
Transposition tables are a well-known method for pruning duplicates in heuristic search. This paper presents a detailed analysis of transposition tables for IDA*. We show that some straightforward implementations of IDA* with transposition tables (IDA*+TT) can result in suboptimal solutions being returned. Furthermore, straightforward implementations of IDA*+TT are not complete. We identify several variants of IDA*+TT which are guaranteed to return the optimal solution, as well as a complete variant. An empirical study shows that IDA*+TT can significantly improve upon the performance of A* in domain-independent planning.
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Published
2010-08-25
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Oral Presentations