Discovery - University of Dundee - Online Publications

Library & Learning Centre

Learning when to use lazy learning in constraint solving

Learning when to use lazy learning in constraint solving

Research output: Chapter in Book/Report/Conference proceedingConference contribution

View graph of relations


  • Ian P. Gent
  • Chris Jefferson
  • Lars Kotthoff
  • Ian Miguel
  • Neil C. A. Moore
  • Peter Nightingale
  • Karen Petrie

Research units


Original languageEnglish
Title of host publicationECAI 2010
Subtitle of host publication19th European Conference on Artificial Intelligence, 16-20 August 2010, Lisbon, Portugal - including Prestigious Applications of Artificial Intelligence (PAIS-2010). Proceedings
EditorsHelder Coelho, Rudi Studer, Michael Wooldridge
Place of PublicationAmsterdam
PublisherIOS Press
Number of pages6
ISBN (Electronic)9781607506065
ISBN (Print)9781607506058
StatePublished - 2010
Event19th European Conference on Artificial Intelligence - Lisbon, Portugal

Publication series

NameFrontiers in artificial intelligence and applications
PublisherIOS Press
ISSN (Print)0922-6389


Conference19th European Conference on Artificial Intelligence
Abbreviated titleECAI 2010
Internet address


Learning in the context of constraint solving is a technique by which previously unknown constraints are uncovered during search and used to speed up subsequent search. Recently, lazy learning, similar to a successful idea from satisfiability modulo theories solvers, has been shown to be an effective means of incorporating constraint learning into a solver. Although a powerful technique to reduce search in some circumstances, lazy learning introduces a substantial overhead, which can outweigh its benefits. Hence, it is desirable to know beforehand whether or not it is expected to be useful. We approach this problem using machine learning (ML). We show that, in the context of a large benchmark set, standard ML approaches can be used to learn a simple, cheap classifier which performs well in identifying instances on which lazy learning should or should not be used. Furthermore, we demonstrate significant performance improvements of a system using our classifier and the lazy learning and standard constraint solvers over a standard solver. Through rigorous cross-validation across the different problem classes in our benchmark set, we show the general applicability of our learned classifier.



Library & Learning Centre

Contact | Accessibility | Policy