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arXiv · 1105.5442

The Divide-and-Conquer Subgoal-Ordering Algorithm for Speeding up Logic Inference

O. Ledeniov·S. Markovitch
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Abstract

It is common to view programs as a combination of logic and control: the logic part defines what the program must do, the control part -- how to do it. The Logic Programming paradigm was developed with the intention of separating the logic from the control. Recently, extensive research has been conducted on automatic generation of control for logic programs. Only a few of these works considered the issue of automatic generation of control for improving the efficiency of logic programs. In this paper we present a novel algorithm for automatic finding of lowest-cost subgoal orderings. The algorithm works using the divide-and-conquer strategy. The given set of subgoals is partitioned into smaller sets, based on co-occurrence of free variables. The subsets are ordered recursively and merged, yielding a provably optimal order. We experimentally demonstrate the utility of the algorithm by testing it in several domains, and discuss the possibilities of its cooperation with other existing methods.

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O. Ledeniov, S. Markovitch. 2011-05-27. The Divide-and-Conquer Subgoal-Ordering Algorithm for Speeding up Logic Inference. https://doi.org/10.1613/jair.509

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