GIR-based ensemble sampling approaches for imbalanced learning
Document Type
Article
Date of Original Version
11-1-2017
Abstract
This paper presents two adaptive ensemble sampling approaches for imbalanced learning: one is the undersampling-based approach, and the other one is the oversampling-based approach, with the objectives of bias reduction and adaptive learning. Both of these two approaches are based on a novel class imbalance metric, termed generalized imbalance ratio (GIR), instead of the conventional sample size ratio. Specifically, these two sampling-based approaches adaptively split the imbalanced learning problem into multiple balanced learning subproblems in a probabilistic way, which forces the classifiers trained in the subproblems focus on those difficult to learn samples. In each subproblem, several weak classifiers are trained in a boosting manner. A final stronger classifier is further built by combining all these weak classifiers in a bagging manner. Extensive experiments are conducted on real-life UCI imbalanced data sets to evaluate the performance of the proposed methods. The superior performance demonstrates the effectiveness of the proposed methods and indicates wide potential applications in data mining.
Publication Title, e.g., Journal
Pattern Recognition
Volume
71
Citation/Publisher Attribution
Tang, Bo, and Haibo He. "GIR-based ensemble sampling approaches for imbalanced learning." Pattern Recognition 71, (2017): 306-319. doi: 10.1016/j.patcog.2017.06.019.