{"id":26243,"date":"2025-03-29T09:05:38","date_gmt":"2025-03-29T02:05:38","guid":{"rendered":"https:\/\/interdata.vn\/blog\/?p=26243"},"modified":"2025-03-29T09:05:38","modified_gmt":"2025-03-29T02:05:38","slug":"pca-la-gi","status":"publish","type":"post","link":"https:\/\/interdata.vn\/blog\/pca-la-gi\/","title":{"rendered":"PCA l\u00e0 g\u00ec? Th\u00f4ng tin n\u00ean bi\u1ebft v\u1ec1 Principal Component Analysis"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">N\u1ed8I DUNG<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/interdata.vn\/blog\/pca-la-gi\/#PCA-la-gi\" >PCA l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/interdata.vn\/blog\/pca-la-gi\/#Ly-do-nen-dung-PCA\" >L\u00fd do n\u00ean d\u00f9ng PCA?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/interdata.vn\/blog\/pca-la-gi\/#Cach-thuc-hoat-dong-cua-PCA\" >C\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a PCA<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/interdata.vn\/blog\/pca-la-gi\/#Uu-va-Nhuoc-diem-cua-Principal-Component-Analysis-%E2%80%93-PCA\" >\u01afu v\u00e0 Nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a Principal Component Analysis &#8211; PCA<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/interdata.vn\/blog\/pca-la-gi\/#Uu-diem-cua-PCA\" >\u01afu \u0111i\u1ec3m c\u1ee7a PCA<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/interdata.vn\/blog\/pca-la-gi\/#Nhuoc-diem-cua-PCA\" >Nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a PCA<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/interdata.vn\/blog\/pca-la-gi\/#So-sanh-PCA-voi-K-means-clustering\" >So s\u00e1nh PCA v\u1edbi K-means clustering<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/interdata.vn\/blog\/pca-la-gi\/#Ung-dung-cua-Principal-Component-Analysis\" >\u1ee8ng d\u1ee5ng c\u1ee7a Principal Component Analysis<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/interdata.vn\/blog\/pca-la-gi\/#Khi-nao-nen-su-dung-Principal-Component-Analysis\" >Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng Principal Component Analysis<\/a><\/li><\/ul><\/nav><\/div>\n<p>Principal Component Analysis (PCA) l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt gi\u1ea3m chi\u1ec1u d\u1eef li\u1ec7u m\u1ea1nh m\u1ebd v\u00e0 ph\u1ed5 bi\u1ebfn trong khoa h\u1ecdc d\u1eef li\u1ec7u, gi\u00fap \u0111\u01a1n gi\u1ea3n h\u00f3a c\u00e1c <a href=\"https:\/\/interdata.vn\/blog\/dataset-la-gi\/\">t\u1eadp d\u1eef li\u1ec7u<\/a> ph\u1ee9c t\u1ea1p m\u00e0 v\u1eabn gi\u1eef \u0111\u01b0\u1ee3c ph\u1ea7n l\u1edbn th\u00f4ng tin c\u1ed1t l\u00f5i. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd gi\u00fap b\u1ea1n hi\u1ec3u r\u00f5 <a href=\"https:\/\/interdata.vn\/blog\/pca-la-gi\/\"><strong>PCA l\u00e0 g\u00ec<\/strong><\/a>, c\u00e1ch ho\u1ea1t \u0111\u1ed9ng, c\u00f9ng v\u1edbi \u01b0u &#8211; nh\u01b0\u1ee3c \u0111i\u1ec3m v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf \u0111\u1ec3 b\u1ea1n c\u00f3 th\u1ec3 hi\u1ec3u chi ti\u1ebft h\u01a1n v\u1ec1 ph\u00e2n t\u00edch th\u00e0nh ph\u1ea7n ch\u00ednh &#8211; PCA.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"PCA-la-gi\"><\/span>PCA l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Principal Component Analysis &#8211; PCA (Ph\u00e2n t\u00edch th\u00e0nh ph\u1ea7n ch\u00ednh) \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p th\u00f4ng d\u1ee5ng \u0111\u1ec3 thu g\u1ecdn s\u1ed1 chi\u1ec1u c\u1ee7a d\u1eef li\u1ec7u trong ng\u00e0nh khoa h\u1ecdc d\u1eef li\u1ec7u<\/strong>. Tr\u1ecdng t\u00e2m c\u1ee7a PCA l\u00e0 l\u00e0m gi\u1ea3m \u0111i s\u1ed1 l\u01b0\u1ee3ng thu\u1ed9c t\u00ednh (bi\u1ebfn) c\u1ee7a m\u1ed9t b\u1ed9 d\u1eef li\u1ec7u, nh\u01b0ng \u0111\u1ed3ng th\u1eddi ph\u1ea3i c\u1ed1 g\u1eafng b\u1ea3o to\u00e0n t\u1ed1i \u0111a l\u01b0\u1ee3ng th\u00f4ng tin c\u1ed1t l\u00f5i ch\u1ee9a \u0111\u1ef1ng trong \u0111\u00f3.<\/p>\n<p>Ng\u01b0\u1eddi ta \u1ee9ng d\u1ee5ng PCA nh\u1eb1m x\u1eed l\u00fd nh\u1eefng th\u00e1ch th\u1ee9c n\u1ea3y sinh t\u1eeb s\u1ef1 ph\u1ee9c t\u1ea1p c\u1ee7a d\u1eef li\u1ec7u, qua \u0111\u00f3 g\u00f3p ph\u1ea7n n\u00e2ng cao hi\u1ec7u qu\u1ea3 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a c\u00e1c m\u00f4 h\u00ecnh h\u1ecdc m\u00e1y.<\/p>\n<figure id=\"attachment_26247\" aria-describedby=\"caption-attachment-26247\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/03\/PCA-la-gi.jpg\" alt=\"PCA l\u00e0 g\u00ec\" width=\"800\" height=\"450\" class=\"size-full wp-image-26247\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/03\/PCA-la-gi.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/03\/PCA-la-gi-300x169.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/03\/PCA-la-gi-768x432.jpg 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/03\/PCA-la-gi-750x422.jpg 750w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-26247\" class=\"wp-caption-text\">PCA l\u00e0 g\u00ec?<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Ly-do-nen-dung-PCA\"><\/span>L\u00fd do n\u00ean d\u00f9ng PCA?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Vi\u1ec7c x\u1eed l\u00fd c\u00e1c b\u1ed9 d\u1eef li\u1ec7u c\u00f3 quy m\u00f4 l\u1edbn th\u01b0\u1eddng g\u1eb7p tr\u1edf ng\u1ea1i do s\u1ed1 l\u01b0\u1ee3ng \u0111\u1eb7c tr\u01b0ng (bi\u1ebfn) qu\u00e1 nhi\u1ec1u, khi\u1ebfn cho vi\u1ec7c minh h\u1ecda d\u1eef li\u1ec7u b\u1eb1ng h\u00ecnh \u1ea3nh v\u00e0 ti\u1ebfn h\u00e0nh ph\u00e2n t\u00edch tr\u1edf n\u00ean ph\u1ee9c t\u1ea1p. PCA mang l\u1ea1i gi\u1ea3i ph\u00e1p th\u00f4ng qua c\u00e1c l\u1ee3i \u00edch sau:<\/p>\n<ul>\n<li><strong>Thu g\u1ecdn kh\u00f4ng gian \u0111\u1eb7c tr\u01b0ng<\/strong>: K\u1ef9 thu\u1eadt n\u00e0y gi\u00fap \u0111\u01a1n gi\u1ea3n h\u00f3a <a href=\"https:\/\/interdata.vn\/blog\/cau-truc-du-lieu\/\">c\u1ea5u tr\u00fac d\u1eef li\u1ec7u<\/a>, l\u00e0m cho m\u00f4 h\u00ecnh b\u1edbt ph\u1ee9c t\u1ea1p h\u01a1n.<\/li>\n<li><strong>Lo\u1ea1i b\u1ecf th\u00f4ng tin nhi\u1ec5u<\/strong>: PCA \u01b0u ti\u00ean c\u00e1c th\u00e0nh ph\u1ea7n ch\u1ee9a nhi\u1ec1u th\u00f4ng tin nh\u1ea5t (th\u00e0nh ph\u1ea7n ch\u00ednh), nh\u1edd \u0111\u00f3 c\u00f3 th\u1ec3 lo\u1ea1i b\u1ecf nh\u1eefng \u0111\u1eb7c tr\u01b0ng \u00edt \u0111\u00f3ng g\u00f3p ho\u1eb7c g\u00e2y nhi\u1ec5u.<\/li>\n<li><strong>T\u0103ng c\u01b0\u1eddng hi\u1ec7u qu\u1ea3 m\u00f4 h\u00ecnh<\/strong>: Vi\u1ec7c gi\u1ea3m chi\u1ec1u d\u1eef li\u1ec7u gi\u00fap r\u00fat ng\u1eafn th\u1eddi gian c\u1ea7n thi\u1ebft cho qu\u00e1 tr\u00ecnh hu\u1ea5n luy\u1ec7n m\u00f4 h\u00ecnh c\u0169ng nh\u01b0 khi m\u00f4 h\u00ecnh th\u1ef1c hi\u1ec7n d\u1ef1 \u0111o\u00e1n.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Cach-thuc-hoat-dong-cua-PCA\"><\/span>C\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a PCA<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>PCA <strong>t\u00f3m t\u1eaft n\u1ed9i dung th\u00f4ng tin<\/strong> c\u1ee7a c\u00e1c b\u1ed9 d\u1eef li\u1ec7u l\u1edbn v\u00e0o m\u1ed9t t\u1eadp h\u1ee3p nh\u1ecf c\u00e1c bi\u1ebfn kh\u00f4ng t\u01b0\u01a1ng quan, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh. C\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh n\u00e0y l\u00e0 c\u00e1c t\u1ed5 h\u1ee3p tuy\u1ebfn t\u00ednh c\u1ee7a c\u00e1c bi\u1ebfn g\u1ed1c, c\u00f3 ph\u01b0\u01a1ng sai l\u1edbn nh\u1ea5t so v\u1edbi c\u00e1c t\u1ed5 h\u1ee3p tuy\u1ebfn t\u00ednh kh\u00e1c. C\u00e1c th\u00e0nh ph\u1ea7n n\u00e0y s\u1ebd n\u1eafm b\u1eaft c\u00e0ng nhi\u1ec1u th\u00f4ng tin t\u1eeb b\u1ed9 d\u1eef li\u1ec7u g\u1ed1c c\u00e0ng t\u1ed1t.<\/p>\n<p>K\u1ef9 thu\u1eadt th\u1ed1ng k\u00ea n\u00e0y bao g\u1ed3m c\u1ea3 <strong>\u0111\u1ea1i s\u1ed1 tuy\u1ebfn t\u00ednh v\u00e0 c\u00e1c ph\u00e9p to\u00e1n ma tr\u1eadn<\/strong>, v\u00e0 n\u00f3 bi\u1ebfn \u0111\u1ed5i b\u1ed9 d\u1eef li\u1ec7u g\u1ed1c th\u00e0nh m\u1ed9t h\u1ec7 t\u1ecda \u0111\u1ed9 m\u1edbi \u0111\u01b0\u1ee3c c\u1ea5u tr\u00fac b\u1edfi c\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh. C\u00e1c vect\u01a1 ri\u00eang v\u00e0 gi\u00e1 tr\u1ecb ri\u00eang t\u1eeb ma tr\u1eadn hi\u1ec7p ph\u01b0\u01a1ng sai, l\u00e0 c\u01a1 s\u1edf c\u1ee7a c\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh, cho ph\u00e9p ph\u00e2n t\u00edch c\u00e1c ph\u00e9p bi\u1ebfn \u0111\u1ed5i tuy\u1ebfn t\u00ednh n\u00e0y.<\/p>\n<p>H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng b\u1ea1n c\u00f3 m\u1ed9t b\u1ed9 d\u1eef li\u1ec7u v\u1edbi nhi\u1ec1u \u0111\u1eb7c tr\u01b0ng, k\u1ebft qu\u1ea3 l\u00e0 m\u1ed9t bi\u1ec3u \u0111\u1ed3 ph\u00e2n t\u00e1n \u0111a chi\u1ec1u. C\u00e1c vect\u01a1 ri\u00eang cung c\u1ea5p h\u01b0\u1edbng bi\u1ebfn thi\u00ean trong bi\u1ec3u \u0111\u1ed3 ph\u00e2n t\u00e1n. Gi\u00e1 tr\u1ecb ri\u00eang l\u00e0 c\u00e1c h\u1ec7 s\u1ed1 c\u1ee7a c\u00e1c vect\u01a1 ri\u00eang, cho bi\u1ebft m\u1ee9c \u0111\u1ed9 quan tr\u1ecdng c\u1ee7a d\u1eef li\u1ec7u theo h\u01b0\u1edbng \u0111\u00f3.<\/p>\n<p>Do \u0111\u00f3, gi\u00e1 tr\u1ecb ri\u00eang cao c\u00f3 ngh\u0129a l\u00e0 vect\u01a1 ri\u00eang t\u01b0\u01a1ng \u1ee9ng quan tr\u1ecdng h\u01a1n. V\u00ec c\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh \u0111\u1ea1i di\u1ec7n cho c\u00e1c h\u01b0\u1edbng c\u00f3 ph\u01b0\u01a1ng sai t\u1ed1i \u0111a trong d\u1eef li\u1ec7u, ch\u00fang c\u0169ng ch\u00ednh l\u00e0 c\u00e1c vect\u01a1 ri\u00eang c\u1ee7a ma tr\u1eadn hi\u1ec7p ph\u01b0\u01a1ng sai.<\/p>\n<p>Hai th\u00e0nh ph\u1ea7n ch\u00ednh ch\u00ednh \u0111\u01b0\u1ee3c t\u00ednh trong PCA: th\u00e0nh ph\u1ea7n ch\u00ednh \u0111\u1ea7u ti\u00ean (PC1) v\u00e0 th\u00e0nh ph\u1ea7n ch\u00ednh th\u1ee9 hai (PC2).<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Uu-va-Nhuoc-diem-cua-Principal-Component-Analysis-%E2%80%93-PCA\"><\/span>\u01afu v\u00e0 Nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a Principal Component Analysis &#8211; PCA<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Uu-diem-cua-PCA\"><\/span>\u01afu \u0111i\u1ec3m c\u1ee7a PCA<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><strong>X\u1eed l\u00fd \u0111a c\u1ed9ng tuy\u1ebfn<\/strong>: PCA t\u1ea1o ra c\u00e1c bi\u1ebfn m\u1edbi kh\u00f4ng c\u00f3 m\u1ed1i t\u01b0\u01a1ng quan \u0111\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 khi c\u00e1c \u0111\u1eb7c tr\u01b0ng g\u1ed1c c\u00f3 s\u1ef1 t\u01b0\u01a1ng quan cao.<\/li>\n<li><strong>Gi\u1ea3m nhi\u1ec5u<\/strong>: PCA lo\u1ea1i b\u1ecf c\u00e1c th\u00e0nh ph\u1ea7n c\u00f3 ph\u01b0\u01a1ng sai th\u1ea5p (\u0111\u01b0\u1ee3c cho l\u00e0 nhi\u1ec5u), gi\u00fap l\u00e0m r\u00f5 d\u1eef li\u1ec7u.<\/li>\n<li><strong>N\u00e9n d\u1eef li\u1ec7u<\/strong>: \u0110\u1ea1i di\u1ec7n d\u1eef li\u1ec7u v\u1edbi \u00edt th\u00e0nh ph\u1ea7n h\u01a1n, gi\u1ea3m nhu c\u1ea7u l\u01b0u tr\u1eef v\u00e0 t\u0103ng t\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd.<\/li>\n<li><strong>Ph\u00e1t hi\u1ec7n \u0111i\u1ec3m ngo\u1ea1i lai<\/strong>: PCA x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111i\u1ec3m d\u1eef li\u1ec7u b\u1ea5t th\u01b0\u1eddng b\u1eb1ng c\u00e1ch ch\u1ec9 ra nh\u1eefng \u0111i\u1ec3m l\u1ec7ch l\u1ea1c \u0111\u00e1ng k\u1ec3 trong kh\u00f4ng gian gi\u1ea3m chi\u1ec1u.<\/li>\n<\/ul>\n<figure id=\"attachment_26248\" aria-describedby=\"caption-attachment-26248\" style=\"width: 797px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/03\/Uu-va-Nhuoc-diem-cua-Principal-Component-Analysis-PCA.jpg\" alt=\"\u01afu v\u00e0 Nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a Principal Component Analysis - PCA\" width=\"797\" height=\"528\" class=\"size-full wp-image-26248\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/03\/Uu-va-Nhuoc-diem-cua-Principal-Component-Analysis-PCA.jpg 797w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/03\/Uu-va-Nhuoc-diem-cua-Principal-Component-Analysis-PCA-300x199.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/03\/Uu-va-Nhuoc-diem-cua-Principal-Component-Analysis-PCA-768x509.jpg 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/03\/Uu-va-Nhuoc-diem-cua-Principal-Component-Analysis-PCA-750x497.jpg 750w\" sizes=\"auto, (max-width: 797px) 100vw, 797px\" \/><figcaption id=\"caption-attachment-26248\" class=\"wp-caption-text\">\u01afu v\u00e0 Nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a Principal Component Analysis &#8211; PCA<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Nhuoc-diem-cua-PCA\"><\/span>Nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a PCA<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><strong>Kh\u00f3 kh\u0103n trong vi\u1ec7c gi\u1ea3i th\u00edch<\/strong>: C\u00e1c th\u00e0nh ph\u1ea7n m\u1edbi l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a c\u00e1c bi\u1ebfn g\u1ed1c, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 kh\u00f3 gi\u1ea3i th\u00edch.<\/li>\n<li><strong>Nh\u1ea1y c\u1ea3m v\u1edbi t\u1ef7 l\u1ec7 d\u1eef li\u1ec7u<\/strong>: PCA y\u00eau c\u1ea7u d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a \u0111\u00fang c\u00e1ch tr\u01b0\u1edbc khi \u00e1p d\u1ee5ng, n\u1ebfu kh\u00f4ng k\u1ebft qu\u1ea3 c\u00f3 th\u1ec3 g\u00e2y hi\u1ec3u l\u1ea7m.<\/li>\n<li><strong>M\u1ea5t th\u00f4ng tin<\/strong>: Vi\u1ec7c gi\u1ea3m chi\u1ec1u c\u00f3 th\u1ec3 l\u00e0m m\u1ea5t m\u1ed9t s\u1ed1 th\u00f4ng tin quan tr\u1ecdng n\u1ebfu gi\u1eef qu\u00e1 \u00edt th\u00e0nh ph\u1ea7n.<\/li>\n<li><strong>Gi\u1ea3 \u0111\u1ecbnh tuy\u1ebfn t\u00ednh<\/strong>: PCA ho\u1ea1t \u0111\u1ed9ng t\u1ed1t nh\u1ea5t khi m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c bi\u1ebfn l\u00e0 tuy\u1ebfn t\u00ednh v\u00e0 c\u00f3 th\u1ec3 g\u1eb7p kh\u00f3 kh\u0103n v\u1edbi d\u1eef li\u1ec7u phi tuy\u1ebfn t\u00ednh.<\/li>\n<li><strong>\u0110\u1ed9 ph\u1ee9c t\u1ea1p t\u00ednh to\u00e1n<\/strong>: PCA c\u00f3 th\u1ec3 ch\u1eadm v\u00e0 ti\u00eau t\u1ed1n t\u00e0i nguy\u00ean khi <a href=\"https:\/\/interdata.vn\/blog\/data-preprocessing-la-gi\/\">x\u1eed l\u00fd d\u1eef li\u1ec7u<\/a> r\u1ea5t l\u1edbn.<\/li>\n<li><strong>Nguy c\u01a1 overfitting<\/strong>: Vi\u1ec7c s\u1eed d\u1ee5ng qu\u00e1 nhi\u1ec1u th\u00e0nh ph\u1ea7n ho\u1eb7c l\u00e0m vi\u1ec7c v\u1edbi m\u1ed9t b\u1ed9 d\u1eef li\u1ec7u nh\u1ecf c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn c\u00e1c m\u00f4 h\u00ecnh kh\u00f4ng c\u00f3 kh\u1ea3 n\u0103ng t\u1ed5ng qu\u00e1t t\u1ed1t.<\/li>\n<\/ul>\n<p>PCA gi\u00fap c\u00f4 \u0111\u1ecdng d\u1eef li\u1ec7u ph\u1ee9c t\u1ea1p th\u00e0nh c\u00e1c y\u1ebfu t\u1ed1 th\u00f4ng tin quan tr\u1ecdng nh\u1ea5t, l\u00e0m cho qu\u00e1 tr\u00ecnh ph\u00e2n t\u00edch tr\u1edf n\u00ean \u0111\u01a1n gi\u1ea3n v\u00e0 hi\u1ec7u qu\u1ea3 h\u01a1n.<\/p>\n<p>PCA x\u00e1c \u0111\u1ecbnh c\u00e1c ph\u01b0\u01a1ng h\u01b0\u1edbng (g\u1ecdi l\u00e0 th\u00e0nh ph\u1ea7n ch\u00ednh) n\u01a1i d\u1eef li\u1ec7u thay \u0111\u1ed5i nhi\u1ec1u nh\u1ea5t. Sau \u0111\u00f3, PCA chi\u1ebfu d\u1eef li\u1ec7u l\u00ean nh\u1eefng ph\u01b0\u01a1ng h\u01b0\u1edbng n\u00e0y, gi\u1ea3m s\u1ed1 chi\u1ec1u c\u1ee7a d\u1eef li\u1ec7u nh\u01b0ng v\u1eabn gi\u1eef l\u1ea1i c\u00e0ng nhi\u1ec1u th\u00f4ng tin c\u00e0ng t\u1ed1t. T\u1eadp h\u1ee3p c\u00e1c bi\u1ebfn kh\u00f4ng t\u01b0\u01a1ng quan m\u1edbi (th\u00e0nh ph\u1ea7n ch\u00ednh) s\u1ebd d\u1ec5 l\u00e0m vi\u1ec7c h\u01a1n v\u00e0 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c nhi\u1ec7m v\u1ee5 nh\u01b0 h\u1ed3i quy, ph\u00e2n lo\u1ea1i ho\u1eb7c tr\u1ef1c quan h\u00f3a.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"So-sanh-PCA-voi-K-means-clustering\"><\/span>So s\u00e1nh PCA v\u1edbi K-means clustering<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>PCA v\u00e0 K-means <a href=\"https:\/\/interdata.vn\/blog\/clustering-la-gi\/\">clustering<\/a> \u0111\u1ec1u l\u00e0 c\u00e1c <strong>k\u1ef9 thu\u1eadt h\u1ecdc m\u00e1y kh\u00f4ng gi\u00e1m s\u00e1t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong ph\u00e2n t\u00edch d\u1eef li\u1ec7u<\/strong>, nh\u01b0ng ch\u00fang c\u00f3 m\u1ee5c ti\u00eau v\u00e0 ph\u01b0\u01a1ng ph\u00e1p kh\u00e1c nhau. PCA \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 gi\u1ea3m chi\u1ec1u d\u1eef li\u1ec7u, trong khi <a href=\"https:\/\/interdata.vn\/blog\/k-means-clustering-la-gi\/\">K-means clustering<\/a> nh\u00f3m c\u00e1c \u0111i\u1ec3m d\u1eef li\u1ec7u l\u1ea1i v\u1edbi nhau d\u1ef1a tr\u00ean s\u1ef1 t\u01b0\u01a1ng \u0111\u1ed3ng. K\u1ef9 thu\u1eadt b\u1ea1n ch\u1ecdn ph\u1ee5 thu\u1ed9c v\u00e0o b\u1ed9 d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 v\u00e0 m\u1ee5c ti\u00eau ph\u00e2n t\u00edch c\u1ee7a b\u1ea1n.<\/p>\n<p>PCA t\u1ea1o ra c\u00e1c bi\u1ebfn m\u1edbi, nh\u01b0 c\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh, l\u00e0 c\u00e1c t\u1ed5 h\u1ee3p tuy\u1ebfn t\u00ednh c\u1ee7a c\u00e1c bi\u1ebfn g\u1ed1c. PCA nh\u1eadn \u0111\u1ea7u v\u00e0o l\u00e0 m\u1ed9t b\u1ed9 d\u1eef li\u1ec7u v\u1edbi nhi\u1ec1u bi\u1ebfn v\u00e0 <strong>t\u1ea1o ra m\u1ed9t b\u1ed9 d\u1eef li\u1ec7u trong kh\u00f4ng gian con th\u1ea5p h\u01a1n<\/strong>, t\u1ee9c l\u00e0 m\u1ed9t b\u1ed9 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c gi\u1ea3m chi\u1ec1u v\u1edbi \u00edt bi\u1ebfn h\u01a1n. N\u00f3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong ph\u00e2n t\u00edch d\u1eef li\u1ec7u kh\u00e1m ph\u00e1 \u0111\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c m\u00f4 h\u00ecnh d\u1ef1 \u0111o\u00e1n, nh\u01b0ng c\u0169ng \u0111\u01b0\u1ee3c d\u00f9ng trong ti\u1ec1n x\u1eed l\u00fd d\u1eef li\u1ec7u \u0111\u1ec3 gi\u1ea3m chi\u1ec1u.<\/p>\n<p>K-means l\u00e0 m\u1ed9t <a href=\"https:\/\/interdata.vn\/blog\/thuat-toan-algorithm\/\">thu\u1eadt to\u00e1n<\/a> ph\u00e2n c\u1ee5m, <strong>g\u00e1n c\u00e1c \u0111i\u1ec3m d\u1eef li\u1ec7u v\u00e0o c\u00e1c nh\u00f3m<\/strong> d\u1ef1a tr\u00ean kho\u1ea3ng c\u00e1ch t\u1eeb c\u00e1c t\u00e2m c\u1ee5m. N\u00f3 nh\u1eadn \u0111\u1ea7u v\u00e0o l\u00e0 m\u1ed9t b\u1ed9 d\u1eef li\u1ec7u v\u1edbi m\u1ed9t ho\u1eb7c nhi\u1ec1u bi\u1ebfn v\u00e0 t\u1ea1o ra m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c nh\u00f3m v\u1edbi c\u00e1c \u0111i\u1ec3m d\u1eef li\u1ec7u t\u01b0\u01a1ng t\u1ef1 nhau. N\u00f3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ph\u00e2n c\u1ee5m d\u1eef li\u1ec7u cho nhi\u1ec1u m\u1ee5c \u0111\u00edch kh\u00e1c nhau, nh\u01b0 <a href=\"https:\/\/interdata.vn\/blog\/image-segmentation-la-gi\/\">ph\u00e2n \u0111o\u1ea1n h\u00ecnh \u1ea3nh<\/a>, ph\u00e2n nh\u00f3m kh\u00e1ch h\u00e0ng v\u00e0 ph\u00e1t hi\u1ec7n b\u1ea5t th\u01b0\u1eddng.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Ung-dung-cua-Principal-Component-Analysis\"><\/span>\u1ee8ng d\u1ee5ng c\u1ee7a Principal Component Analysis<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u00c1p d\u1ee5ng PCA c\u00f3 th\u1ec3 gi\u00fap ti\u1ec1n x\u1eed l\u00fd ho\u1eb7c tr\u00edch xu\u1ea5t c\u00e1c \u0111\u1eb7c tr\u01b0ng th\u00f4ng tin quan tr\u1ecdng nh\u1ea5t t\u1eeb c\u00e1c b\u1ed9 d\u1eef li\u1ec7u c\u00f3 nhi\u1ec1u bi\u1ebfn. Ti\u1ec1n x\u1eed l\u00fd gi\u00fap gi\u1ea3m \u0111\u1ed9 ph\u1ee9c t\u1ea1p trong khi v\u1eabn gi\u1eef l\u1ea1i th\u00f4ng tin quan tr\u1ecdng.<\/p>\n<p>M\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng ph\u1ed5 bi\u1ebfn c\u1ee7a PCA bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>N\u00e9n h\u00ecnh \u1ea3nh: <\/strong>PCA gi\u1ea3m chi\u1ec1u c\u1ee7a h\u00ecnh \u1ea3nh trong khi v\u1eabn gi\u1eef l\u1ea1i c\u00e1c th\u00f4ng tin thi\u1ebft y\u1ebfu. N\u00f3 gi\u00fap t\u1ea1o ra c\u00e1c \u0111\u1ea1i di\u1ec7n h\u00ecnh \u1ea3nh g\u1ecdn nh\u1eb9 h\u01a1n, l\u00e0m cho vi\u1ec7c l\u01b0u tr\u1eef v\u00e0 truy\u1ec1n t\u1ea3i h\u00ecnh \u1ea3nh d\u1ec5 d\u00e0ng h\u01a1n.<\/li>\n<li><strong>Tr\u1ef1c quan h\u00f3a d\u1eef li\u1ec7u: <\/strong>PCA gi\u00fap tr\u1ef1c quan h\u00f3a d\u1eef li\u1ec7u c\u00f3 nhi\u1ec1u chi\u1ec1u b\u1eb1ng c\u00e1ch chi\u1ebfu n\u00f3 v\u00e0o kh\u00f4ng gian c\u00f3 \u00edt chi\u1ec1u h\u01a1n, ch\u1eb3ng h\u1ea1n nh\u01b0 bi\u1ec3u \u0111\u1ed3 2D ho\u1eb7c 3D. \u0110i\u1ec1u n\u00e0y l\u00e0m cho vi\u1ec7c gi\u1ea3i th\u00edch v\u00e0 kh\u00e1m ph\u00e1 d\u1eef li\u1ec7u tr\u1edf n\u00ean \u0111\u01a1n gi\u1ea3n h\u01a1n.<\/li>\n<li><strong>L\u1ecdc nhi\u1ec5u: <\/strong>PCA c\u00f3 th\u1ec3 lo\u1ea1i b\u1ecf nhi\u1ec5u ho\u1eb7c th\u00f4ng tin d\u01b0 th\u1eeba kh\u1ecfi d\u1eef li\u1ec7u b\u1eb1ng c\u00e1ch t\u1eadp trung v\u00e0o c\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh n\u1eafm b\u1eaft c\u00e1c m\u00f4 h\u00ecnh c\u01a1 b\u1ea3n.<\/li>\n<li><strong>D\u1ef1 \u0111o\u00e1n ung th\u01b0 v\u00fa: <\/strong>PCA c\u0169ng \u0111\u00e3 \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng trong y t\u1ebf. V\u00ed d\u1ee5, n\u00f3 \u0111\u00e3 h\u1ed7 tr\u1ee3 trong vi\u1ec7c ch\u1ea9n \u0111o\u00e1n b\u1ec7nh s\u1edbm v\u00e0 ch\u00ednh x\u00e1c h\u01a1n. B\u00e0i b\u00e1o &#8220;Breast Cancer <a href=\"https:\/\/interdata.vn\/blog\/predictive-ai-la-gi\/\">Prediction<\/a> using Principal Component Analysis with Logistic Regression&#8221; ph\u00e2n t\u00edch b\u1ed9 d\u1eef li\u1ec7u ung th\u01b0 v\u00fa n\u1ed5i ti\u1ebfng \u0111\u01b0\u1ee3c thu th\u1eadp t\u1eeb b\u1ec7nh nh\u00e2n t\u1ea1i B\u1ec7nh vi\u1ec7n \u0110\u1ea1i h\u1ecdc Wisconsin, Madison.<\/li>\n<\/ul>\n<p>M\u1ed9t thu\u1eadt to\u00e1n ph\u00e2n lo\u1ea1i h\u1ecdc gi\u00e1m s\u00e1t, h\u1ed3i quy logistic, \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n li\u1ec7u b\u1ec7nh ung th\u01b0 v\u00fa c\u00f3 xu\u1ea5t hi\u1ec7n hay kh\u00f4ng.<\/p>\n<figure id=\"attachment_26249\" aria-describedby=\"caption-attachment-26249\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/03\/Ung-dung-cua-Principal-Component-Analysis.png\" alt=\"\u1ee8ng d\u1ee5ng c\u1ee7a Principal Component Analysis\" width=\"800\" height=\"500\" class=\"size-full wp-image-26249\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/03\/Ung-dung-cua-Principal-Component-Analysis.png 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/03\/Ung-dung-cua-Principal-Component-Analysis-300x188.png 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/03\/Ung-dung-cua-Principal-Component-Analysis-768x480.png 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/03\/Ung-dung-cua-Principal-Component-Analysis-750x469.png 750w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-26249\" class=\"wp-caption-text\">\u1ee8ng d\u1ee5ng c\u1ee7a Principal Component Analysis<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Khi-nao-nen-su-dung-Principal-Component-Analysis\"><\/span>Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng Principal Component Analysis<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>C\u00f3 nhi\u1ec1u k\u1ef9 thu\u1eadt gi\u1ea3m chi\u1ec1u kh\u00e1c c\u00f3 s\u1eb5n, bao g\u1ed3m ph\u00e2n t\u00edch ph\u00e2n bi\u1ec7t tuy\u1ebfn t\u00ednh (LDA), r\u1eebng ng\u1eabu nhi\u00ean (<a href=\"https:\/\/interdata.vn\/blog\/random-forest-la-gi\/\">Random Forest<\/a>), x\u1ea5p x\u1ec9 v\u00e0 chi\u1ebfu \u0111a di\u1ec7n \u0111\u1ed3ng nh\u1ea5t (UMAP), v\u00e0 l\u00e1ng gi\u1ec1ng ng\u1eabu nhi\u00ean t-distributed (t-SNE).<\/p>\n<p>H\u00e3y c\u00e2n nh\u1eafc c\u00e1c y\u1ebfu t\u1ed1 sau \u0111\u1ec3 quy\u1ebft \u0111\u1ecbnh li\u1ec7u PCA c\u00f3 ph\u1ea3i l\u00e0 ph\u01b0\u01a1ng ph\u00e1p ph\u00f9 h\u1ee3p cho ph\u00e2n t\u00edch c\u1ee7a b\u1ea1n kh\u00f4ng:<\/p>\n<ul>\n<li><strong>T\u00ednh tuy\u1ebfn t\u00ednh<\/strong>: PCA l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt tuy\u1ebfn t\u00ednh, trong khi c\u00e1c k\u1ef9 thu\u1eadt kh\u00e1c nh\u01b0 t-SNE v\u00e0 UMAP l\u1ea1i phi tuy\u1ebfn. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 PCA ph\u00f9 h\u1ee3p h\u01a1n v\u1edbi c\u00e1c b\u1ed9 d\u1eef li\u1ec7u c\u00f3 m\u1ed1i quan h\u1ec7 tuy\u1ebfn t\u00ednh gi\u1eefa c\u00e1c bi\u1ebfn. C\u00e1c k\u1ef9 thu\u1eadt phi tuy\u1ebfn ph\u00f9 h\u1ee3p h\u01a1n v\u1edbi c\u00e1c b\u1ed9 d\u1eef li\u1ec7u c\u00f3 m\u1ed1i quan h\u1ec7 phi tuy\u1ebfn ho\u1eb7c ph\u1ee9c t\u1ea1p h\u01a1n gi\u1eefa c\u00e1c bi\u1ebfn.<\/li>\n<li><strong>T\u00ednh to\u00e1n<\/strong>: PCA s\u1eed d\u1ee5ng c\u00e1c ph\u00e9p to\u00e1n ma tr\u1eadn \u0111\u1ec3 t\u00ednh to\u00e1n v\u00e0 qu\u1ea3n l\u00fd hi\u1ec7u qu\u1ea3 c\u00e1c b\u1ed9 d\u1eef li\u1ec7u l\u1edbn. C\u00e1c k\u1ef9 thu\u1eadt kh\u00e1c nh\u01b0 t-SNE v\u00e0 UMAP l\u1ea1i \u0111\u1eaft \u0111\u1ecf v\u00e0 c\u00f3 th\u1ec3 kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c b\u1ed9 d\u1eef li\u1ec7u l\u1edbn.<\/li>\n<li><strong>B\u1ea3o t\u1ed3n th\u00f4ng tin<\/strong>: PCA b\u1ea3o t\u1ed3n t\u1ed1i \u0111a ph\u01b0\u01a1ng sai trong d\u1eef li\u1ec7u. t-SNE v\u00e0 UMAP t\u1eadp trung v\u00e0o vi\u1ec7c b\u1ea3o t\u1ed3n c\u1ea5u tr\u00fac c\u1ee5c b\u1ed9 c\u1ee7a d\u1eef li\u1ec7u. Do \u0111\u00f3, PCA ph\u00f9 h\u1ee3p h\u01a1n trong vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1c bi\u1ebfn quan tr\u1ecdng nh\u1ea5t trong d\u1eef li\u1ec7u. C\u00e1c k\u1ef9 thu\u1eadt phi tuy\u1ebfn ph\u00f9 h\u1ee3p h\u01a1n \u0111\u1ec3 tr\u1ef1c quan h\u00f3a d\u1eef li\u1ec7u trong kh\u00f4ng gian c\u00f3 \u00edt chi\u1ec1u.<\/li>\n<li><strong>Tr\u00edch xu\u1ea5t \u0111\u1eb7c tr\u01b0ng<\/strong>: PCA l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt tr\u00edch xu\u1ea5t \u0111\u1eb7c tr\u01b0ng. N\u00f3 t\u1ea1o ra c\u00e1c bi\u1ebfn m\u1edbi l\u00e0 c\u00e1c t\u1ed5 h\u1ee3p tuy\u1ebfn t\u00ednh c\u1ee7a c\u00e1c bi\u1ebfn g\u1ed1c. C\u00e1c k\u1ef9 thu\u1eadt kh\u00e1c (nh\u01b0 UMAP v\u00e0 t-SNE) kh\u00f4ng t\u1ea1o ra c\u00e1c bi\u1ebfn m\u1edbi. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 PCA c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c bi\u1ebfn quan tr\u1ecdng nh\u1ea5t trong d\u1eef li\u1ec7u. C\u00e1c k\u1ef9 thu\u1eadt phi tuy\u1ebfn ph\u00f9 h\u1ee3p h\u01a1n \u0111\u1ec3 tr\u1ef1c quan h\u00f3a d\u1eef li\u1ec7u trong kh\u00f4ng gian c\u00f3 \u00edt chi\u1ec1u.<\/li>\n<\/ul>\n<p>Principal Component Analysis l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 h\u1eefu \u00edch \u0111\u1ec3 x\u1eed l\u00fd d\u1eef li\u1ec7u c\u00f3 nhi\u1ec1u \u0111\u1eb7c tr\u01b0ng, gi\u00fap n\u00e2ng cao hi\u1ec7u su\u1ea5t m\u00f4 h\u00ecnh v\u00e0 kh\u1ea3 n\u0103ng tr\u1ef1c quan h\u00f3a. Tuy nhi\u00ean, vi\u1ec7c \u00e1p d\u1ee5ng PCA c\u0169ng c\u1ea7n c\u00e2n nh\u1eafc k\u1ef9 l\u01b0\u1ee1ng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u00f4ng l\u00e0m m\u1ea5t \u0111i nh\u1eefng th\u00f4ng tin quan tr\u1ecdng.<\/p>\n<p>Khi x\u1eed l\u00fd c\u00e1c thu\u1eadt to\u00e1n nh\u01b0 PCA tr\u00ean t\u1eadp d\u1eef li\u1ec7u l\u1edbn, vi\u1ec7c l\u1ef1a ch\u1ecdn h\u1ea1 t\u1ea7ng <a href=\"https:\/\/interdata.vn\/blog\/may-chu-server-la-gi\/\">m\u00e1y ch\u1ee7<\/a> m\u1ea1nh m\u1ebd v\u00e0 \u1ed5n \u0111\u1ecbnh l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng. T\u1ea1i InterData, b\u1ea1n c\u00f3 th\u1ec3 <a href=\"https:\/\/interdata.vn\/thue-vps\/\">thu\u00ea VPS ch\u1ea5t l\u01b0\u1ee3ng gi\u00e1 r\u1ebb<\/a> v\u00e0 <a href=\"https:\/\/interdata.vn\/cloud-server\/\">thu\u00ea Cloud Server t\u1ed1c \u0111\u1ed9 cao<\/a>, v\u1edbi ph\u1ea7n c\u1ee9ng hi\u1ec7n \u0111\u1ea1i nh\u01b0 <a href=\"https:\/\/interdata.vn\/blog\/cpu-server\/\">CPU<\/a> <a href=\"https:\/\/interdata.vn\/blog\/cpu-amd-epyc\/\">AMD EPYC<\/a> ho\u1eb7c <a href=\"https:\/\/interdata.vn\/blog\/intel-xeon\/\">Intel Xeon<\/a> Platinum, SSD NVMe U.2 t\u1ed1c \u0111\u1ed9 cao, <a href=\"https:\/\/interdata.vn\/blog\/bang-thong-la-gi\/\">b\u0103ng th\u00f4ng<\/a> l\u1edbn v\u00e0 dung l\u01b0\u1ee3ng t\u1ed1i \u01b0u cho nhu c\u1ea7u h\u1ecdc m\u00e1y, ph\u00e2n t\u00edch d\u1eef li\u1ec7u hay ch\u1ea1y m\u00f4 h\u00ecnh AI.<\/p>\n<div class=\"entry-content no-share\">\n<div class=\"content-inner \">\n<p>H\u00e3y li\u00ean h\u1ec7 ngay \u0111\u1ec3 \u0111\u01b0\u1ee3c t\u01b0 v\u1ea5n gi\u1ea3i ph\u00e1p ph\u00f9 h\u1ee3p v\u1edbi nhu c\u1ea7u c\u1ee7a b\u1ea1n!<\/p>\n<p><strong>INTERDATA<\/strong><\/p>\n<ul>\n<li><strong><a href=\"https:\/\/interdata.vn\/blog\/website-la-gi\/\">Website<\/a>:<\/strong>\u00a0Interdata.vn<\/li>\n<li><strong>Hotline:<\/strong>\u00a01900-636822<\/li>\n<li><strong>Email:<\/strong>\u00a0Info@interdata.vn<\/li>\n<li><strong>VP\u0110D:<\/strong>\u00a0240 Nguy\u1ec5n \u0110\u00ecnh Ch\u00ednh, P.11. Q. Ph\u00fa Nhu\u1eadn, TP. Ho\u0302\u0300 Ch\u00ed Minh<\/li>\n<li><strong>VPGD:<\/strong>\u00a0S\u1ed1 211 \u0110\u01b0\u1eddng s\u1ed1 5, K\u0110T Lakeview City, P. An Ph\u00fa, TP. Th\u1ee7 \u0110\u1ee9c, TP. H\u1ed3 Ch\u00ed Minh<\/li>\n<\/ul>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Principal Component Analysis (PCA) l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt gi\u1ea3m chi\u1ec1u d\u1eef li\u1ec7u m\u1ea1nh m\u1ebd v\u00e0 ph\u1ed5 bi\u1ebfn trong khoa h\u1ecdc d\u1eef li\u1ec7u, gi\u00fap \u0111\u01a1n gi\u1ea3n h\u00f3a c\u00e1c t\u1eadp d\u1eef li\u1ec7u ph\u1ee9c t\u1ea1p m\u00e0 v\u1eabn gi\u1eef \u0111\u01b0\u1ee3c ph\u1ea7n l\u1edbn th\u00f4ng tin c\u1ed1t l\u00f5i. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd gi\u00fap b\u1ea1n hi\u1ec3u r\u00f5 PCA l\u00e0 g\u00ec, c\u00e1ch ho\u1ea1t<\/p>\n","protected":false},"author":11,"featured_media":26250,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108],"tags":[],"class_list":["post-26243","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ai"],"_links":{"self":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/26243","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/comments?post=26243"}],"version-history":[{"count":2,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/26243\/revisions"}],"predecessor-version":[{"id":26251,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/26243\/revisions\/26251"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media\/26250"}],"wp:attachment":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media?parent=26243"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/categories?post=26243"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/tags?post=26243"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}