支持向量機(jī)(SVM )作為一種分類技術(shù)已經(jīng)成功運(yùn)用于入侵檢測(cè)，但是支持向量機(jī)的
性能與參數(shù)的選擇相關(guān)。在實(shí)際應(yīng)用中支持向量機(jī)的參數(shù)選取問(wèn)題一直沒(méi)有得到很好地解決。粒子群優(yōu)化（PSO）算法作為一種基于群智能方法的進(jìn)化計(jì)算技術(shù)，具有良好的全局搜索能力。為了能夠自動(dòng)獲取最優(yōu)的支持向量機(jī)參數(shù)，提出了在入侵檢測(cè)系統(tǒng)中基于改進(jìn)微粒群優(yōu)化(IPSO)算法的支持向量機(jī)參數(shù)選擇方法，以kdd99數(shù)據(jù)集進(jìn)行了仿真實(shí)驗(yàn)。仿真實(shí)驗(yàn)結(jié)果表明：基于粒子群訓(xùn)練的支持向量機(jī)方法能夠比較好地提高入侵檢測(cè)系統(tǒng)中數(shù)據(jù)的分類精度。
關(guān)鍵詞：粒子群優(yōu)化；支持向量機(jī)；入侵檢測(cè)系統(tǒng)
Abstract : As a classification technical , support vector machines（SVM）have been applied in intrusion detection successful, But the performance of SVM is determined by its hyper parameters. In practice, the problem on how to select parameters of SVM is not solved properly. As an evolutionary computation technique based on swarm intelligence particle swarm optimization (PSO) algorithm has high global search ability, In order to optimize parameters of SVM automatically, a parameter selection approach based on PSO is proposed in this paper. Experiments with the data set kdd99 show that the method which based on PSO training of the SVM can improve the classification accuracy of dataset in IDS.
Key words: Particle swarm optimization; support vector machines; Intrusion detection system