A Generalised Approach for Encoding and Reasoning with Qualitative Theories in Answer Set Programming

TL;DR

This paper introduces a unified ASP-based framework for qualitative reasoning that supports multiple calculi and combines qualitative with other reasoning types, demonstrated through a real-world telecommunication case study.

Contribution

It proposes a family of ASP encodings capable of handling any qualitative calculus with binary relations, enabling integrated qualitative and non-qualitative reasoning.

Findings

Encodings outperform one dedicated reasoner in certain cases

Encodings are versatile across different qualitative calculi

Trade-off between performance and interpretability of logic programs

Abstract

Qualitative reasoning involves expressing and deriving knowledge based on qualitative terms such as natural language expressions, rather than strict mathematical quantities. Well over 40 qualitative calculi have been proposed so far, mostly in the spatial and temporal domains, with several practical applications such as naval traffic monitoring, warehouse process optimisation and robot manipulation. Even if a number of specialised qualitative reasoning tools have been developed so far, an important barrier to the wider adoption of these tools is that only qualitative reasoning is supported natively, when real-world problems most often require a combination of qualitative and other forms of reasoning. In this work, we propose to overcome this barrier by using ASP as a unifying formalism to tackle problems that require qualitative reasoning in addition to non-qualitative reasoning. A family of ASP encodings is proposed which can handle any qualitative calculus with binary relations. These encodings are experimentally evaluated using a real-world dataset based on a case study of determining optimal coverage of telecommunication antennas, and compared with the performance of two well-known dedicated reasoners. Experimental results show that the proposed encodings outperform one of the two reasoners, but fall behind the other, an acceptable trade-off given the added benefits of handling any type of reasoning as well as the interpretability of logic programs. This paper is under consideration for acceptance in TPLP.