Class-Aware Based KNN Classification Method

Many conventional classification methods start with the hypothesis that the distribution of training samples is same as or at least similar to that of testing samples. In many practical applications, it is difficult to agree with the above hypothesis. And thus the classification performance of some traditional methods, such as support vector machine, is reduced. Therefore, a class-aware based KNN classification method(CA-KNN) is proposed. A sparse representation model is proposed based on the assumption that any testing sample can be represented sparsely by the training samples. The class label information is utilized effectively by CA-KNN to improve the accuracy of the sparse representation. The idea of nearest neighbor classification of KNN is introduced to improve the generalization capability of CA-KNN. And it is proved in theory that CA-KNN classifier is directly related to Bayes decision rule for the minimum error. The experimental and theoretical results show that CA-KNN generates better classification performance. © 2021, Science Press. All right reserved.