KNN DEMO This is a binary classification problem defined on a N*N field.

k-nn算法实现分类，模式识别作业，分三类，75个训练集，25个测试集，输出对测试集分类的结果,k-nn classification algorithm, pattern recognition operations are classified into three types, 75 training sets, 25 test set, the output of the test set classification results

KNN分类算法，命令行启动，从命令行参数输入文件名-KNN classification algorithm, the command line start, enter the file name from the command line parameter