A novel adaptive boundary weighted and synthetic minority oversampling algorithm for imbalanced datasets

Article type: Research Article

Authors: Song, Xudong | Chen, Yilin^{; *} | Liang, Pan | Wan, Xiaohui | Cui, Yunxian

Affiliations: Big Data & Intelligent System Research Group, Dalian Jiaotong University, Dalian, China

Correspondence: [*] Corresponding author. Yilin Chen. E-mail: 1162678372@qq.com.

Abstract: In recent years, imbalanced data learning has attracted a lot of attention from academia and industry as a new challenge. In order to solve the problems such as imbalances between and within classes, this paper proposes an adaptive boundary weighted synthetic minority oversampling algorithm (ABWSMO) for unbalanced datasets. ABWSMO calculates the sample space clustering density based on the distribution of the underlying data and the K-Means clustering algorithm, incorporates local weighting strategies and global weighting strategies to improve the SMOTE algorithm to generate data mechanisms that enhance the learning of important samples at the boundary of unbalanced data sets and avoid the traditional oversampling algorithm generate unnecessary noise. The effectiveness of this sampling algorithm in improving data imbalance is verified by experimentally comparing five traditional oversampling algorithms on 16 unbalanced ratio datasets and 3 classifiers in the UCI database.

Keywords: Imbalanced data, oversampling, classifier, boundary weighted, within and between class imbalance

DOI: 10.3233/JIFS-220937

Journal: Journal of Intelligent & Fuzzy Systems, vol. 44, no. 2, pp. 3245-3259, 2023