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Using Tabled Logic Programming to Solve the Petrobras Planning Problem

Published online by Cambridge University Press:  21 July 2014

ROMAN BARTÁK  and
NENG-FA ZHOU
ROMAN BARTÁK
Affiliation:
Charles University in Prague, Faculty of Mathematics and Physics, Prague, Czech Republic (e-mail: [email protected])
NENG-FA ZHOU
Affiliation:
The City University of New York, Brooklyn College, New York, USA (e-mail: [email protected])
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Abstract

Tabling has been used for some time to improve efficiency of Prolog programs by memorizing answered queries. The same idea can be naturally used to memorize visited states during search for planning. In this paper we present a planner developed in the Picat language to solve the Petrobras planning problem. Picat is a novel Prolog-like language that provides pattern matching, deterministic and non-deterministic rules, and tabling as its core modelling and solving features. We demonstrate these capabilities using the Petrobras problem, where the goal is to plan transport of cargo items from ports to platforms using vessels with limited capacity. Monte Carlo Tree Search has been so far the best technique to tackle this problem and we will show that by using tabling we can achieve much better runtime efficiency and better plan quality.

Keywords

tablingresource-bounded searchsymmetry breakingplanninglogistics
Type
Regular Papers
Information
Theory and Practice of Logic Programming , Volume 14 , Special Issue 4-5: 30th International Conference on Logic Programming , July 2014 , pp. 697 - 710
Copyright
Copyright © Cambridge University Press 2014 

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