中文说明：knn（k-近邻）用于模式识别，实验所需数据已给出，适用于初学者加深对knn算法的理解。
English Description：
KNN (k-nearest neighbor) is used for pattern recognition, and the experimental data are given. It is suitable for beginners to deepen the understanding of KNN algorithm.
KNN (k-nearest neighbor) for pattern recognition
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中文说明：knn（k-近邻）用于模式识别，实验所需数据已给出，适用于初学者加深对knn算法的理解。
English Description：
KNN (k-nearest neighbor) is used for pattern recognition, and the experimental data are given. It is suitable for beginners to deepen the understanding of KNN algorithm.