Affiliations: [a] School of Computer Science and Technology, Anhui University of Technology, Maanshan, Anhui, China | [b] Anhui Engineering Research Center for Intelligent Applications and Security of Industrial Internet, Maanshan, Anhui, China | [c] Institute of Artificial Intelligence, Hefei Comprehensive National Science Center, Hefei, Anhui, China | [d] Department of Radiology, Maanshan People’s Hospital, Maanshan, Anhui, China
Correspondence:
[*]
Corresponding author: Wei Xue, School of Computer Science and Technology, Anhui University of Technology, Maanshan, Anhui 243032, China. E-mail: xuewei@ahut.edu.cn.
Abstract: Imbalanced data classification has received much attention in machine learning, and many oversampling methods exist to solve this problem. However, these methods may suffer from insufficient noise filtering, overlap between synthetic and original samples, etc., resulting in degradation of classification performance. To this end, we propose a hybrid sampling with two-step noise filtering (HSNF) method in this paper, which consists of three modules. In the first module, HSNF denoises twice according to different noise discrimination mechanisms. Note that denoising mechanism is essentially based on the Euclidean distance between samples. Then in the second module, the minority class samples are divided into two categories, boundary samples and safe samples, respectively, and a portion of the boundary majority class samples are removed. In the third module, different oversampling methods are used to synthesize instances for boundary minority class samples and safe minority class samples. Experimental results on synthetic data and benchmark datasets demonstrate the effectiveness of HSNF in comparison with several popular methods. The code of HSNF will be released.
