Array ( [0] => Array ( [title] => L12A [link] => https://www.youtube.com/embed/pAuK4bayhdw ) [1] => Array ( [title] => L12B [link] => https://www.youtube.com/embed/aer2PR1xHtg ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第12R講 稀疏矩陣 / Principal Component Analysis (PCA)