---
title: "Dealing with Multiple Classes in Online Class Imbalance Learning"
authors:
  - "Shuo Wang"
  - "Leandro L. Minku"
  - "Xin Yao"
doi: ""
url: "https://ijcai.org/proceedings/2016/302"
pdf: "https://ijcai.org/proceedings/2016/0302.pdf"
venue: "Proceedings of the Twenty-Fifth International Joint Conference on Artificial Intelligence"
year: 2016
pages: "2118-2123"
track: ""
keywords:
---

# Dealing with Multiple Classes in Online Class Imbalance Learning

Shuo Wang, Leandro L. Minku, Xin Yao

*Proceedings of the Twenty-Fifth International Joint Conference on Artificial Intelligence*, pages 2118-2123.

## Abstract

Online class imbalance learning deals with data streams having very skewed class distributions in a timely fashion. Although a few methods have been proposed to handle such problems, most of them focus on two-class cases. Multi-class imbalance imposes additional challenges in learning. This paper studies the combined challenges posed by multi-class imbalance and online learning, and aims at a more effective and adaptive solution. First, we introduce two resampling-based ensemble methods, called MOOB and MUOB, which can process multi-class data directly and strictly online with an adaptive sampling rate. Then, we look into the impact of multi-minority and multi-majority cases on MOOB and MUOB in comparison to other methods under stationary and dynamic scenarios. Both multi-minority and multi-majority make a negative impact. MOOB shows the best and most stable G-mean in most stationary and dynamic cases.