是统计分析的一个重要理论.+ q5 i: i! o: A
Principal ComponentsAnalysis (PCA). PCA is a useful statistical technique that has found application in / v2 @: P% j: j- h% dfields such as face recognition and image compression, and is a common technique for* k) s8 n* K' V4 ?& U+ u( N( x
finding patterns in data of high dimension.