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Accurate ensemble pruning with PL-bagging

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  • Chung, Dongjun
  • Kim, Hyunjoong

Abstract

Ensemble pruning deals with the selection of base learners prior to combination in order to improve prediction accuracy and efficiency. In the ensemble literature, it has been pointed out that in order for an ensemble classifier to achieve higher prediction accuracy, it is critical for the ensemble classifier to consist of accurate classifiers which at the same time diverse as much as possible. In this paper, a novel ensemble pruning method, called PL-bagging, is proposed. In order to attain the balance between diversity and accuracy of base learners, PL-bagging employs positive Lasso to assign weights to base learners in the combination step. Simulation studies and theoretical investigation showed that PL-bagging filters out redundant base learners while it assigns higher weights to more accurate base learners. Such improved weighting scheme of PL-bagging further results in higher classification accuracy and the improvement becomes even more significant as the ensemble size increases. The performance of PL-bagging was compared with state-of-the-art ensemble pruning methods for aggregation of bootstrapped base learners using 22 real and 4 synthetic datasets. The results indicate that PL-bagging significantly outperforms state-of-the-art ensemble pruning methods such as Boosting-based pruning and Trimmed bagging.

Suggested Citation

  • Chung, Dongjun & Kim, Hyunjoong, 2015. "Accurate ensemble pruning with PL-bagging," Computational Statistics & Data Analysis, Elsevier, vol. 83(C), pages 1-13.
  • Handle: RePEc:eee:csdana:v:83:y:2015:i:c:p:1-13
    DOI: 10.1016/j.csda.2014.09.003
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    References listed on IDEAS

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    1. Croux, Christophe & Joossens, Kristel & Lemmens, Aurelie, 2007. "Trimmed bagging," Computational Statistics & Data Analysis, Elsevier, vol. 52(1), pages 362-368, September.
    2. Hothorn, Torsten & Lausen, Berthold, 2005. "Bundling classifiers by bagging trees," Computational Statistics & Data Analysis, Elsevier, vol. 49(4), pages 1068-1078, June.
    3. Zhang, Chun-Xia & Zhang, Jiang-She & Zhang, Gai-Ying, 2009. "Using Boosting to prune Double-Bagging ensembles," Computational Statistics & Data Analysis, Elsevier, vol. 53(4), pages 1218-1231, February.
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    Cited by:

    1. Youness Manzali & Mohamed Elfar, 2023. "Random Forest Pruning Techniques: A Recent Review," SN Operations Research Forum, Springer, vol. 4(2), pages 1-14, June.

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