Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/21598
Appears in Collections:Computing Science and Mathematics Conference Papers and Proceedings
Peer Review Status: Refereed
Authors: Brownlee, Alexander
McCall, John
Christie, Lee
Contact Email: sbr@cs.stir.ac.uk
Title: Structural Coherence of Problem and Algorithm: An Analysis for EDAs on all 2-bit and 3-bit Problems
Citation: Brownlee A, McCall J & Christie L (2015) Structural Coherence of Problem and Algorithm: An Analysis for EDAs on all 2-bit and 3-bit Problems In: Proceedings of the 2015 IEEE Congress on Evolutionary Computation, Piscataway, NJ, USA: IEEE Press. IEEE Congress on Evolutionary Computation 2015, 25.5.2015 - 28.5.2015, Sendai, Japan, pp. 2066-2073.
Issue Date: 25-May-2015
Conference Name: IEEE Congress on Evolutionary Computation 2015
Conference Dates: 2015-05-25T00:00:00Z
Conference Location: Sendai, Japan
Abstract: Metaheuristics assume some kind of coherence between decision and objective spaces. Estimation of Distribution algorithms approach this by constructing an explicit probabilistic model of high fitness solutions, the structure of which is intended to reflect the structure of the problem. In this context, ``structure'' means the dependencies or interactions between problem variables in a probabilistic graphical model. There are many approaches to discovering these dependencies, and existing work has already shown that often these approaches discover ``unnecessary'' elements of structure - that is, elements which are not needed to correctly rank solutions. This work performs an exhaustive analysis of all 2 and 3 bit problems, grouped into classes based on mononotic invariance. It is shown in (Christie, 2014) that each class has a minimal Walsh structure that can be used to solve the problem. We compare the structure discovered by different structure learning approaches to the minimal Walsh structure for each class, with summaries of which interactions are (in)correctly identified. Our analysis reveals a large number of symmetries that may be used to simplify problem solving. We show that negative selection can result in improved coherence between discovered and necessary structure, and conclude with some directions for a general programme of study building on this work.
Type: Conference Paper
Status: Book Chapter: author post-print (pre-copy editing)
Rights: Publisher allows this work to be made available in this repository. Published in Proceedings of IEEE Congress on Evolutionary Computation 2015 by IEEE with the following policy: Authors and/or their employers shall have the right to post the accepted version of IEEE-copyrighted articles on their own personal servers or the servers of their institutions or employers without permission from IEEE, provided that the posted version includes a prominently displayed IEEE copyright notice and, when published, a full citation to the original IEEE publication, including a link to the article abstract in IEEE Xplore. Authors shall not post the final, published versions of their papers.
URI: http://hdl.handle.net/1893/21598
URL: http://ieeexplore.ieee.org/document/7257139/?arnumber=7257139&tag=1
Affiliation: Computing Science - CSM Dept
Robert Gordon University
Robert Gordon University

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