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Domain-Independent Cost-Optimal Planning in ASP

Published online by Cambridge University Press:  20 September 2019

DAVID SPIES ,
JIA-HUAI YOU Open the ORCID record for JIA-HUAI YOU [Opens in a new window]  and
RYAN HAYWARD
DAVID SPIES
Affiliation:
University of Alberta, Edmonton, Canada
JIA-HUAI YOU
Affiliation:
University of Alberta, Edmonton, Canada
RYAN HAYWARD
Affiliation:
University of Alberta, Edmonton, Canada
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Abstract

We investigate the problem of cost-optimal planning in ASP. Current ASP planners can be trivially extended to a cost-optimal one by adding weak constraints, but only for a given makespan (number of steps). It is desirable to have a planner that guarantees global optimality. In this paper, we present two approaches to addressing this problem. First, we show how to engineer a cost-optimal planner composed of two ASP programs running in parallel. Using lessons learned from this, we then develop an entirely new approach to cost-optimal planning, stepless planning, which is completely free of makespan. Experiments to compare the two approaches with the only known cost-optimal planner in SAT reveal good potentials for stepless planning in ASP.

Keywords

Cost-Optimal PlanningAnswer Set ProgrammingCORE-2 ASP Standard.
Type
Original Article
Information
Theory and Practice of Logic Programming , Volume 19 , Special Issue 5-6: 35th International Conference on Logic Programming , September 2019 , pp. 1124 - 1142
Copyright
© Cambridge University Press 2019 

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