Journal
IEEE TRANSACTIONS ON CYBERNETICS
Volume 47, Issue 9, Pages 2850-2861Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCYB.2016.2579658
Keywords
Class-imbalance; clustering; ensemble learning; evolutionary algorithms (EAs); evolutionary cluster-based over-sampling ensemble (ECO-Ensemble); synthetic data generation
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Funding
- Economic Development Board Industrial Postgraduate Programme Fund [R-263-000-A14-592]
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Class imbalance problems, where the number of samples in each class is unequal, is prevalent in numerous real world machine learning applications. Traditional methods which are biased toward the majority class are ineffective due to the relative severity of misclassifying rare events. This paper proposes a novel evolutionary cluster-based oversampling ensemble framework, which combines a novel cluster-based synthetic data generation method with an evolutionary algorithm (EA) to create an ensemble. The proposed synthetic data generation method is based on contemporary ideas of identifying oversampling regions using clusters. The novel use of EA serves a twofold purpose of optimizing the parameters of the data generation method while generating diverse examples leveraging on the characteristics of EAs, reducing overall computational cost. The proposed method is evaluated on a set of 40 imbalance datasets obtained from the University of California, Irvine, database, and outperforms current state-of-the-art ensemble algorithms tackling class imbalance problems.
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