20th International Conference on Automated Planning and Scheduling

When Abstractions Met Landmarks

author: Carmel Domshlak, Technion - Israel Institute of Technology
published: Nov. 15, 2010, recorded: May 2010, views: 133

Slides

Slides
0:00	When Abstractions Met Landmarks
1:20	Context - 1
2:40	Context - 2
2:57	Context - 3
3:23	Context - 4
3:39	Implicit Abstractions - Fork Decomposition
4:35	Goal Sensitivity - 1
4:59	Goal Sensitivity - 2
5:43	Goal Sensitivity - 3
6:05	Goal Sensitivity - 4
6:14	Landmarks
7:10	Enriching Planning Task - 1
7:40	Enriching Planning Task - 2
7:56	Enriching Planning Task - 3
8:35	Enriching Planning Task - 4
9:02	Landmark-based Heuristics - 1
9:56	Landmark-based Heuristics - 2
10:37	Enriching Planning Task - 1
11:22	Enriching Planning Task - 2
13:02	Evaluation - Forks
15:40	Evaluation - Cost Partition
16:26	Evaluation - Merge & Shrink
17:47	Summary and Future Work - 1
18:21	- Questions

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Description

Abstractions and landmarks are two powerful mechanisms for devising admissible heuristics for classical planning. Here we aim at putting them together by integrating landmark information into abstractions, and propose a concrete realization of this direction suitable for structural-pattern abstractions, as well as for other abstraction heuristics. Our empirical evaluation shows that landmark information can substantially improve the quality of abstraction heuristic estimates.