¹ College of Computer Science and Technology,Tianjin University, Tianjin, 300072 China; College of Mathematics and Computer, Hebei University, Baoing, 071002 China
² College of Electronic and Information Engineering, Hebei University, Baoding, 071002 China

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Abstract—One of the main difficulties in machine learning is how to solve large-scale problems effectively, and the labeled data are limited and fairly expensive to obtain. In this paper a new semi-supervised SVM algorithm is proposed. It applies tri-training to improve SVM. The semisupervised SVM makes use of the large number of unlabeled data to modify the classifiers iteratively. Although tri-training doesn’t put any constraints on the classifier, the proposed method uses three different SVMs as the classification algorithm. Experiments on UCI datasets and application to the intrusion anomaly detection show that tritraining can improve the classification accuracy of SVM and its improved algorithms. We also find the accuracy of final classifier will be higher by increasing the difference of classifiers. Theoretical analysis and experiments show that the proposed method has excellent accuracy and classification speed.

Index Terms—semi-supervised learning, co-training, tritraining, support vector machine, intrusion detection

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Cite: Jimin Li, Wei Zhang, and KunLun Li, " A Novel Semi-supervised SVM Based on Tri-training for Intrusition Detection," Journal of Computers vol. 5, no. 4, pp. 638-645, 2010.