是统计分析的一个重要理论. 0 E( ~, C. u) S }- n+ zPrincipal ComponentsAnalysis (PCA). PCA is a useful statistical technique that has found application in* @; v) M" Q# r
fields such as face recognition and image compression, and is a common technique for/ [/ v- E3 d5 @
finding patterns in data of high dimension.