是统计分析的一个重要理论. ( I/ \9 O/ D( I3 X* d4 UPrincipal ComponentsAnalysis (PCA). PCA is a useful statistical technique that has found application in% o1 q5 H$ w+ s& @
fields such as face recognition and image compression, and is a common technique for" J8 E& J3 o, \1 Q
finding patterns in data of high dimension.