Projects per year
Abstract
We explore the problem of stepwise explaining how to solve constraint satisfaction problems, with a use case on logic grid puzzles. More specifically, we study the problem of explaining the inference steps that one can take during propagation, in a way that is easy to interpret for a person. Thereby, we aim to give the constraint solver explainable agency, which can help in building trust in the solver by being able to understand and even learn from the explanations. The main challenge is that of finding a sequence of simple explanations, where each explanation should aim to be as cognitively easy as possible for a human to verify and understand. This contrasts with the arbitrary combination of facts and constraints that the solver may use when propagating. We propose the use of a cost function to quantify how simple an individual explanation of an inference step is, and identify the explanationproduction problem of finding the best sequence of explanations of a CSP. Our approach is agnostic of the underlying constraint propagation mechanisms, and can provide explanations even for inference steps resulting from combinations of constraints. In case multiple constraints are involved, we also develop a mechanism that allows to break the most difficult steps up and thus gives the user the ability to zoom in on specific parts of the explanation. Our proposed algorithm iteratively constructs the explanation sequence by using an optimistic estimate of the cost function to guide the search for the best explanation at each step. Our experiments on logic grid puzzles show the feasibility of the approach in terms of the quality of the individual explanations and the resulting explanation sequences obtained.
Original language  English 

Article number  103550 
Journal  Artificial Intelligence 
Volume  300 
DOIs  
Publication status  Published  Nov 2021 
Keywords
 Artificial Intelligence
 constraint satisfaction
 explanation
 Explainable AI
 MUS
 Natural language processing
 Logic programming
 explanatory framework
Fingerprint
Dive into the research topics of 'A framework for stepwise explaining how to solve constraint satisfaction problems'. Together they form a unique fingerprint.Projects
 2 Active

FWOAL1002: FRESCO: A FRamework for Explainable Solving and Constraint Optimization
1/01/21 → 31/12/24
Project: Fundamental

VLAAI1: Subsidie: Onderzoeksprogramma Artificiële Intelligentie (AI) Vlaanderen
1/07/19 → 31/12/22
Project: Applied
Research output
 3 Conference paper

Efficiently Explaining CSPs with Unsatisfiable Subset Optimization
Gamba, E., Bogaerts, B. & Guns, T., 2021, Efficiently Explaining CSPs with Unsatisfiable Subset Optimization . IJCAI, p. 13811388 191Research output: Chapter in Book/Report/Conference proceeding › Conference paper
Open AccessFile12 Downloads (Pure) 
Stepwise Explanations of Constraint Satisfaction Problems
Bogaerts, B., Gamba, E., Guns, T. & Claes, J., 24 Aug 2020, ECAI 2020  24th European Conference on Artificial Intelligence, including 10th Conference on Prestigious Applications of Artificial Intelligence, PAIS 2020  Proceedings. De Giacomo, G., Catala, A., Dilkina, B., Milano, M., Barro, S., Bugarin, A. & Lang, J. (eds.). IOS Press, Vol. 325. p. 640647 8 p. (Frontiers in Artificial Intelligence and Applications; vol. 325).Research output: Chapter in Book/Report/Conference proceeding › Conference paper
Open AccessFile2 Citations (Scopus)28 Downloads (Pure) 
ZebraTutor: Explaining how to solve logic grid puzzles (demo)
Claes, J., Bogaerts, B., Canoy, R., Gamba, E. & Guns, T., 1 Jan 2019, Proceedings of the 31st Benelux Conference on Artificial Intelligence (demos). Vol. 2491. p. 9696 1 p. (CEUR Workshop Proceedings).Research output: Chapter in Book/Report/Conference proceeding › Conference paper
Open AccessFile
Activities
 1 Talk or presentation at a workshop/seminar

Stepwise Explaining How to Solve Constraint Satisfaction Problems
Bart Bogaerts (Speaker), Emilio Gamba (Contributor), Tias Guns (Contributor)13 Sep 2020Activity: Talk or presentation › Talk or presentation at a workshop/seminar
File