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Landmarks, Critical Paths and Abstractions: What's the Difference Anyway?

Authors
  • Helmert, Malte
  • Domshlak, Carmel
Publication Date
Jan 01, 2010
Source
Dagstuhl Research Online Publication Server
Keywords
Language
English
License
Unknown
External links

Abstract

Current heuristic estimators for classical domain-independent planning are usually based on one of four ideas: delete relaxation, abstraction, critical paths, and, most recently, landmarks. Previously, these different ideas for deriving heuristic functions were largely unconnected. In my talk, I will show that these heuristics are in fact very closely related. Moreover, I will introduce a new admissible heuristic called the landmark cut heuristic which exploits this relationship. In our experiments, the landmark cut heuristic provides better estimates than other current admissible planning heuristics, especially on large problem instances.

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