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The Importance of Diversity in Neural Network Ensembles: An Empirical Investigation
School of Business and Informatics, University of Borås, SE-501 90 Borås, Sweden.
School of Business and Informatics, University of Borås, SE-501 90 Borås, Sweden.
University of Skövde, School of Humanities and Informatics. University of Skövde, The Informatics Research Centre.
2007 (English)In: The International Joint Conference on Neural Networks, IEEE Press, 2007, 661-666 p.Conference paper, (Refereed)
Abstract [en]

When designing ensembles, it is almost an axiom that the base classifiers must be diverse in order for the ensemble to generalize well. Unfortunately, there is no clear definition of the key term diversity, leading to several diversity measures and many, more or less ad hoc, methods for diversity creation in ensembles. In addition, no specific diversity measure has shown to have a high correlation with test set accuracy. The purpose of this paper is to empirically evaluate ten different diversity measures, using neural network ensembles and 11 publicly available data sets. The main result is that all diversity measures evaluated, in this study too, show low or very low correlation with test set accuracy. Having said that, two measures; double fault and difficulty show slightly higher correlations compared to the other measures. The study furthermore shows that the correlation between accuracy measured on training or validation data and test set accuracy also is rather low. These results challenge ensemble design techniques where diversity is explicitly maximized or where ensemble accuracy on a hold-out set is used for optimization.

Place, publisher, year, edition, pages
IEEE Press, 2007. 661-666 p.
Series
IEEE International Joint Conference on Neural Networks (IJCNN), ISSN 1098-7576
Research subject
Technology
Identifiers
URN: urn:nbn:se:his:diva-2103DOI: 10.1109/IJCNN.2007.4371035ISI: 000254291100115Scopus ID: 2-s2.0-44649141743ISBN: 978-1-4244-1380-5 OAI: oai:DiVA.org:his-2103DiVA: diva2:32379
Available from: 2008-05-30 Created: 2008-05-30 Last updated: 2013-03-18

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Publisher's full textScopushttp://www.ieeexplore.ieee.org/iel5/4370890/4370891/04371035.pdf?tp=&isnumber=4370891&arnumber=4371035

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf