Fast local search methods for solving limited memory influence diagrams

Denis Deratani Mauá, Fabio Gagliardi Cozman

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

© 2015 Elsevier Inc. All rights reserved. Limited memory influence diagrams are graph-based models that describe decision problems with limited information such as planning with teams and/or agents with imperfect recall. Solving a (limited memory) influence diagram is an NP-hard problem, often approached through local search. In this work we give a closer look at k-neighborhood local search approaches. We show that finding a k-neighboring strategy that improves on the current solution is W[1]-hard and hence unlikely to be polynomial-time tractable. We also show that finding a strategy that resembles an optimal strategy (but may have low expected utility) is NP-hard. We then develop fast schema to perform approximate k-local search; experiments show that our methods improve on current local search algorithms both with respect to time and to accuracy.
Original languageAmerican English
Pages (from-to)230-245
Number of pages16
JournalInternational Journal of Approximate Reasoning
DOIs
StatePublished - 1 Jan 2016
Externally publishedYes

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