是统计分析的一个重要理论.. N% ?" U- I, G. D0 e
Principal ComponentsAnalysis (PCA). PCA is a useful statistical technique that has found application in5 { L# ~+ r' J" v. a6 g
fields such as face recognition and image compression, and is a common technique for * X1 O0 @/ ?- D/ [finding patterns in data of high dimension.