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Computational and Mathematical Methods in Medicine
Volume 2013 (2013), Article ID 768404, 10 pages
Research Article

Iterative Reweighted Noninteger Norm Regularizing SVM for Gene Expression Data Classification

1Department of Automation, China University of Petroleum, Beijing 102249, China
2Beijing Aerospace Propulsion Institute, Beijing 10076, China

Received 8 May 2013; Accepted 26 June 2013

Academic Editor: Seiya Imoto

Copyright © 2013 Jianwei Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Support vector machine is an effective classification and regression method that uses machine learning theory to maximize the predictive accuracy while avoiding overfitting of data. L2 regularization has been commonly used. If the training dataset contains many noise variables, L1 regularization SVM will provide a better performance. However, both L1 and L2 are not the optimal regularization method when handing a large number of redundant values and only a small amount of data points is useful for machine learning. We have therefore proposed an adaptive learning algorithm using the iterative reweighted p-norm regularization support vector machine for 0 < p ≤ 2. A simulated data set was created to evaluate the algorithm. It was shown that a p value of 0.8 was able to produce better feature selection rate with high accuracy. Four cancer data sets from public data banks were used also for the evaluation. All four evaluations show that the new adaptive algorithm was able to achieve the optimal prediction error using a p value less than L1 norm. Moreover, we observe that the proposed Lp penalty is more robust to noise variables than the L1 and L2 penalties.