中文说明：主成分分析PCA对数据矩阵进行降维，可以减少计算量，缩短计算时间，降低CPU负载，需要考虑实时性的场合可以采用主成分分析PCA对数据进行处理。只需要对程序当中的k值进行调整，即可降维到相应的维数，简单方便
English Description：
Principal component analysis PCA can reduce the dimension of data matrix, which can reduce the amount of calculation, shorten the calculation time and reduce the CPU load. Only need to adjust the K value of the program, can reduce the dimension to the corresponding dimension, simple and convenient