基于弱分类器调整的多分类Adaboost算法

doi:10.11999/JEIT150544

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Abstract

Adaboost.M1 requires each weak classifier,s accuracy rate more than 1/2. But it is difficult to find a weak classifier which accuracy rate more than 1/2 in a multiple classification issues. Some scholars put forward the Stagewise Additive Modeling using a Multi-class Exponential loss function (SAMME) algorithm, it reduces the weak classifier accuracy requirements, from more than 1/2 to more than 1/k (k is the category number). SAMME algorithm reduces the difficulty to find weak classifier. But, due to the SAMME algorithm is no guarantee that the effectiveness of the weak classifier, which does not ensure that the final classifier improves classification accuracy. This paper analyzes the multi-class Adaboost algorithm by graphic method and math method, and then a new kind of multi-class classification method is proposed which not only reduces the weak classifier accuracy requirements, but also ensures the effectiveness of the weak classifier. In the benchmark experiments on UCI data sets show that the proposed algorithm are better than the SAMME, and achieves the effect of Adaboost.M1.

Key words： Multi-class classification Stagewise Additive Modeling using a Multi-class Exponential loss function (SAMME) Adaboost.M1

Received: 11 May 2015 Published: 18 November 2015

PACS:

TP391.4

Corresponding Authors: YANG Xinwu E-mail: yang_xinwu@bjut.edu.cn

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	YANG Xinwu
	MA Zhuang
	YUAN Shun

Cite this article:

YANG Xinwu,MA Zhuang,YUAN Shun. Multi-class Adaboost Algorithm Based on the Adjusted Weak Classifier[J]. JEIT, 2016, 38(2): 373-380.

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http://jeit.ie.ac.cn/EN/10.11999/JEIT150544 OR http://jeit.ie.ac.cn/EN/Y2016/V38/I2/373

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