面向非均衡数据类的朴素贝叶斯改进算法

An improved naive Bayesian algorithm for unbalanced data classes

针对朴素贝叶斯分类器存在对非均衡样本分类时,易将少数类样本分到多数类的问题,利用感受性曲线的性质和深度特征加权的思想,提出一种面向非均衡数据类的朴素贝叶斯加权算法(DA-WNB)。为了验证该算法对不平衡数据分类的有效性,实验结果以AUC、真正类率、整体精度为指标,仿真结果表明,该算法能提高少数类分类准确率(最高达60%),且能保持较高的整体精度。

Naive Bayesian classifier is easy to divide minority-class samples into majority class samples while classifying unbalanced samples. In view of this phenomenon,an deep AUC (area under curve) weighted naive Bayesian (DA - WNB) algorithm for unbalanced data classes is proposed,which is based on property of receiver operating characteristic curve and thought of deep feature weighting. In order to verify the effectiveness of the algorithm for unbalanced data classification,the AUC,true positive rate(TPR)and overall accuracy are taken as the indicators for experiments. The simulation results show that the algorithm can improve the minority-class classification accuracy highest to 60%,and can maintain the high overall accuracy.