关键词: 半监督学习, 类别不平衡, Bootstrapping, Internet流量分类

Abstract:

Aiming at the class labeling starvation and class imbalance problems in Internet traffic classification, a bootstrapping based traffic classification method was presented. An initial classifier was trained on a small number of labeled samples, and then it is updated iteratively by predicting the class labels of unlabeled samples and extending the training set. A new algorithm was devised to compute the confidence used for selecting new labeled samples into the extension set. It correctly adopts classifying unlabeled samples with a posterior probability distribution as probabilistic event and to decrease the noise in the extension set. Moreover, the heuristic rule was built with aid of probably approximately correct theory, its biases is toward selecting minority class samples into the extension set so as to reduce class imbalance degree. Experiments show that the bootstrapping based classifier gets improved of 9.46% on overall classification accuracy compared with initial classifier, and the recalls of minority classes get increased about 2.22% averagely compared with the existing method.

Key words: semi-supervised learning, class imbalance, Bootstrapping, Internet traffic classification