TY - JOUR
AU - Pommerening, Florian
AU - RĂ¶ger, Gabriele
AU - Helmert, Malte
AU - Cambazard, Hadrien
AU - Rousseau, Louis-Martin
AU - Salvagnin, Domenico
PY - 2019/07/06
Y2 - 2021/04/17
TI - Lagrangian Decomposition for Optimal Cost Partitioning
JF - Proceedings of the International Conference on Automated Planning and Scheduling
JA - ICAPS
VL - 29
IS - 1
SE - Main Track
DO -
UR - https://ojs.aaai.org/index.php/ICAPS/article/view/3496
SP - 338-347
AB - <p>Optimal cost partitioning of classical planning heuristics has been shown to lead to excellent heuristic values but is often prohibitively expensive to compute. Lagrangian decomposition and Lagrangian relaxation are classical tools in mathematical programming that apply to optimization problems with a special block structure. We analyze the application of Lagrangian decomposition to cost partitioning in the context of operator-counting heuristics and interpret Lagrangian multipliers as cost functions for the combined heuristics. This allows us to view the computation of an optimal cost partitioning as an iterative process that can be seeded with any cost partitioning and improves over time. We derive an anytime algorithm to compute an optimal non-negative cost partitioning of abstraction heuristics without involving an LP solver. In each iteration, the computation reduces to independent shortest path problems in all abstractions. Finally, we discuss the extension to general cost functions.</p>
ER -