{"id":27089,"date":"2025-04-18T10:51:38","date_gmt":"2025-04-18T03:51:38","guid":{"rendered":"https:\/\/interdata.vn\/blog\/?p=27089"},"modified":"2025-04-26T14:07:39","modified_gmt":"2025-04-26T07:07:39","slug":"feature-engineering-la-gi","status":"publish","type":"post","link":"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/","title":{"rendered":"Feature Engineering l\u00e0 g\u00ec? Vai tr\u00f2 &#038; \u1ee8ng d\u1ee5ng trong h\u1ecdc m\u00e1y"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 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\/feature-engineering-la-gi\/#Feature-Engineering-la-gi\" >Feature Engineering 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\/feature-engineering-la-gi\/#Vai-tro-cua-Feature-Engineering-trong-Machine-Learning\" >Vai tr\u00f2 c\u1ee7a Feature Engineering trong Machine Learning<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Cai-thien-hieu-suat-va-do-chinh-xac-cua-mo-hinh\" >C\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a m\u00f4 h\u00ecnh<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Tang-cuong-su-phu-hop-cua-du-lieu-voi-thuat-toan\" >T\u0103ng c\u01b0\u1eddng s\u1ef1 ph\u00f9 h\u1ee3p c\u1ee7a d\u1eef li\u1ec7u v\u1edbi thu\u1eadt to\u00e1n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Giam-do-phuc-tap-va-thoi-gian-huan-luyen\" >Gi\u1ea3m \u0111\u1ed9 ph\u1ee9c t\u1ea1p v\u00e0 th\u1eddi gian hu\u1ea5n luy\u1ec7n<\/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\/feature-engineering-la-gi\/#Tang-kha-nang-dien-giai-va-hieu-mo-hinh\" >T\u0103ng kh\u1ea3 n\u0103ng di\u1ec5n gi\u1ea3i v\u00e0 hi\u1ec3u m\u00f4 h\u00ecnh<\/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\/feature-engineering-la-gi\/#Cach-thuc-hoat-dong-cua-ky-thuat-dac-trung-%E2%80%93-Feature-Engineering\" >C\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a k\u1ef9 thu\u1eadt \u0111\u1eb7c tr\u01b0ng &#8211; Feature Engineering<\/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\/feature-engineering-la-gi\/#Ky-thuat-Feature-Engineering\" >K\u1ef9 thu\u1eadt Feature Engineering<\/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\/feature-engineering-la-gi\/#Cac-thuat-ngu-pho-bien-lien-quan-den-Feature-Engineering\" >C\u00e1c thu\u1eadt ng\u1eef ph\u1ed5 bi\u1ebfn li\u00ean quan \u0111\u1ebfn Feature Engineering<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Feature-Dac-trung\" >Feature (\u0110\u1eb7c tr\u01b0ng)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Raw-Data-Du-lieu-tho\" >Raw Data (D\u1eef li\u1ec7u th\u00f4)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Feature-Selection-Lua-chon-dac-trung\" >Feature Selection (L\u1ef1a ch\u1ecdn \u0111\u1eb7c tr\u01b0ng)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Feature-Extraction-Trich-xuat-dac-trung\" >Feature Extraction (Tr\u00edch xu\u1ea5t \u0111\u1eb7c tr\u01b0ng)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Encoding-Ma-hoa\" >Encoding (M\u00e3 h\u00f3a)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#ScalingNormalization-Chuan-hoaQuy-ve-thang-do\" >Scaling\/Normalization (Chu\u1ea9n h\u00f3a\/Quy v\u1ec1 thang \u0111o)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Imputation-Gan-gia-tri-thieu\" >Imputation (G\u00e1n gi\u00e1 tr\u1ecb thi\u1ebfu)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#BinningDiscretization-Roi-rac-hoa\" >Binning\/Discretization (R\u1eddi r\u1ea1c h\u00f3a)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Mot-so-thach-thuc-cua-Feature-Engineering\" >M\u1ed9t s\u1ed1 th\u00e1ch th\u1ee9c c\u1ee7a Feature Engineering<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Yeu-cau-kien-thuc-chuyen-mon-Domain-Knowledge\" >Y\u00eau c\u1ea7u ki\u1ebfn th\u1ee9c chuy\u00ean m\u00f4n (Domain Knowledge)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Ton-nhieu-thoi-gian-va-cong-suc\" >T\u1ed1n nhi\u1ec1u th\u1eddi gian v\u00e0 c\u00f4ng s\u1ee9c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Tinh-%E2%80%9CNghe-thuat%E2%80%9D-va-kho-he-thong-hoa\" >T\u00ednh &#8220;Ngh\u1ec7 thu\u1eadt&#8221; v\u00e0 kh\u00f3 h\u1ec7 th\u1ed1ng h\u00f3a<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Nguy-co-ro-ri-du-lieu-Data-Leakage\" >Nguy c\u01a1 r\u00f2 r\u1ec9 d\u1eef li\u1ec7u (Data Leakage)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Loi-nguyen-chieu-khong-gian-Curse-of-Dimensionality\" >L\u1eddi nguy\u1ec1n chi\u1ec1u kh\u00f4ng gian (Curse of Dimensionality)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Cac-truong-hop-su-dung-Feature-Engineering\" >C\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng Feature Engineering<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Xu-ly-du-lieu-dang-bang-Tabular-Data\" >X\u1eed l\u00fd d\u1eef li\u1ec7u d\u1ea1ng b\u1ea3ng (Tabular Data)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Xu-ly-du-lieu-van-ban-Text-Data-trong-NLP\" >X\u1eed l\u00fd d\u1eef li\u1ec7u v\u0103n b\u1ea3n (Text Data) trong NLP<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Xu-ly-du-lieu-hinh-anh-Image-Data-trong-Computer-Vision\" >X\u1eed l\u00fd d\u1eef li\u1ec7u h\u00ecnh \u1ea3nh (Image Data) trong Computer Vision<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Xu-ly-du-lieu-chuoi-thoi-gian-Time-Series-Data\" >X\u1eed l\u00fd d\u1eef li\u1ec7u chu\u1ed7i th\u1eddi gian (Time Series Data)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/#Cac-ung-dung-khac\" >C\u00e1c \u1ee9ng d\u1ee5ng kh\u00e1c<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<p>Feature Engineering l\u00e0 m\u1ed9t trong nh\u1eefng b\u01b0\u1edbc quan tr\u1ecdng nh\u1ea5t trong qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n m\u00f4 h\u00ecnh Machine Learning (H\u1ecdc m\u00e1y). N\u00f3 gi\u00fap chuy\u1ec3n \u0111\u1ed5i d\u1eef li\u1ec7u th\u00f4 th\u00e0nh c\u00e1c \u0111\u1eb7c tr\u01b0ng (features) c\u00f3 gi\u00e1 tr\u1ecb, t\u1eeb \u0111\u00f3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a m\u00f4 h\u00ecnh. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd gi\u00fap b\u1ea1n hi\u1ec3u r\u00f5 <a href=\"https:\/\/interdata.vn\/blog\/feature-engineering-la-gi\/\"><strong>Feature Engineering l\u00e0 g\u00ec<\/strong><\/a>, vai tr\u00f2 c\u1ee7a n\u00f3 trong Machine Learning, c\u00e1c k\u1ef9 thu\u1eadt ph\u1ed5 bi\u1ebfn, \u0111\u1ed3ng th\u1eddi \u0111\u01b0a ra c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a k\u1ef9 thu\u1eadt n\u00e0y trong c\u00e1c l\u0129nh v\u1ef1c kh\u00e1c nhau. \u0110\u1ecdc ngay!<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Feature-Engineering-la-gi\"><\/span><strong>Feature Engineering l\u00e0 g\u00ec?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Feature Engineering<\/strong> (hay K\u1ef9 thu\u1eadt t\u1ea1o \u0111\u1eb7c tr\u01b0ng) l\u00e0 qu\u00e1 tr\u00ecnh s\u1eed d\u1ee5ng ki\u1ebfn th\u1ee9c chuy\u00ean m\u00f4n \u0111\u1ec3 l\u1ef1a ch\u1ecdn, bi\u1ebfn \u0111\u1ed5i v\u00e0 t\u1ea1o ra c\u00e1c \u0111\u1eb7c tr\u01b0ng (features) t\u1eeb d\u1eef li\u1ec7u th\u00f4. M\u1ee5c \u0111\u00edch l\u00e0 l\u00e0m cho d\u1eef li\u1ec7u ph\u00f9 h\u1ee3p h\u01a1n, gi\u00fap m\u00f4 h\u00ecnh Machine Learning (H\u1ecdc m\u00e1y) ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3 v\u00e0 ch\u00ednh x\u00e1c h\u01a1n.<\/p>\n<figure id=\"attachment_27095\" aria-describedby=\"caption-attachment-27095\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Feature-Engineering-la-gi.jpg\" alt=\"Feature Engineering l\u00e0 g\u00ec?\" width=\"800\" height=\"400\" class=\"size-full wp-image-27095\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Feature-Engineering-la-gi.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Feature-Engineering-la-gi-300x150.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Feature-Engineering-la-gi-768x384.jpg 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Feature-Engineering-la-gi-360x180.jpg 360w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Feature-Engineering-la-gi-750x375.jpg 750w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-27095\" class=\"wp-caption-text\">Feature Engineering l\u00e0 g\u00ec?<\/figcaption><\/figure>\n<p>\u0110\u00e2y l\u00e0 b\u01b0\u1edbc c\u1ef1c k\u1ef3 quan tr\u1ecdng trong m\u1ecdi d\u1ef1 \u00e1n Machine Learning. Ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a c\u00e1c \u0111\u1eb7c tr\u01b0ng \u0111\u01b0\u1ee3c t\u1ea1o ra \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn kh\u1ea3 n\u0103ng h\u1ecdc h\u1ecfi v\u00e0 d\u1ef1 \u0111o\u00e1n c\u1ee7a m\u00f4 h\u00ecnh. D\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o t\u1ed1t quy\u1ebft \u0111\u1ecbnh ph\u1ea7n l\u1edbn th\u00e0nh c\u00f4ng c\u1ee7a m\u00f4 h\u00ecnh cu\u1ed1i c\u00f9ng.<\/p>\n<p>H\u00e3y h\u00ecnh dung d\u1eef li\u1ec7u th\u00f4 nh\u01b0 nh\u1eefng nguy\u00ean li\u1ec7u ch\u01b0a qua ch\u1ebf bi\u1ebfn. Feature Engineering gi\u1ed1ng nh\u01b0 vi\u1ec7c ng\u01b0\u1eddi \u0111\u1ea7u b\u1ebfp t\u00e0i n\u0103ng (Data Scientist\/ML Engineer) ch\u1ebf bi\u1ebfn ch\u00fang th\u00e0nh nh\u1eefng th\u00e0nh ph\u1ea7n tinh t\u00fay, gi\u00fap m\u00f3n \u0103n (m\u00f4 h\u00ecnh ML) tr\u1edf n\u00ean ngon v\u00e0 h\u1ea5p d\u1eabn h\u01a1n r\u1ea5t nhi\u1ec1u.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Vai-tro-cua-Feature-Engineering-trong-Machine-Learning\"><\/span><strong>Vai tr\u00f2 c\u1ee7a Feature Engineering trong Machine Learning<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>T\u1ea1i sao k\u1ef9 thu\u1eadt feature engineering l\u1ea1i quan tr\u1ecdng trong ML? Feature Engineering \u0111\u00f3ng vai tr\u00f2 then ch\u1ed1t trong vi\u1ec7c x\u00e2y d\u1ef1ng c\u00e1c m\u00f4 h\u00ecnh Machine Learning th\u00e0nh c\u00f4ng. N\u00f3 gi\u00fap n\u00e2ng cao hi\u1ec7u su\u1ea5t m\u00f4 h\u00ecnh, l\u00e0m d\u1eef li\u1ec7u ph\u00f9 h\u1ee3p h\u01a1n v\u1edbi thu\u1eadt to\u00e1n, gi\u1ea3m \u0111\u1ed9 ph\u1ee9c t\u1ea1p t\u00ednh to\u00e1n v\u00e0 t\u0103ng kh\u1ea3 n\u0103ng di\u1ec5n gi\u1ea3i k\u1ebft qu\u1ea3 d\u1ef1 \u0111o\u00e1n cu\u1ed1i c\u00f9ng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Cai-thien-hieu-suat-va-do-chinh-xac-cua-mo-hinh\"><\/span><strong>C\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a m\u00f4 h\u00ecnh<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Vai tr\u00f2 quan tr\u1ecdng nh\u1ea5t c\u1ee7a Feature Engineering l\u00e0 <strong>c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 hi\u1ec7u su\u1ea5t d\u1ef1 \u0111o\u00e1n c\u1ee7a m\u00f4 h\u00ecnh<\/strong>. C\u00e1c \u0111\u1eb7c tr\u01b0ng ch\u1ea5t l\u01b0\u1ee3ng cao, ch\u1ee9a th\u00f4ng tin li\u00ean quan, gi\u00fap thu\u1eadt to\u00e1n h\u1ecdc m\u00e1y nh\u1eadn di\u1ec7n c\u00e1c m\u1eabu v\u00e0 m\u1ed1i quan h\u1ec7 trong d\u1eef li\u1ec7u t\u1ed1t h\u01a1n, d\u1eabn \u0111\u1ebfn \u0111\u1ed9 ch\u00ednh x\u00e1c cao h\u01a1n.<\/p>\n<p>V\u00ed d\u1ee5, trong b\u00e0i to\u00e1n d\u1ef1 \u0111o\u00e1n gi\u00e1 nh\u00e0, thay v\u00ec ch\u1ec9 d\u00f9ng &#8216;ng\u00e0y x\u00e2y d\u1ef1ng&#8217;, vi\u1ec7c t\u1ea1o ra \u0111\u1eb7c tr\u01b0ng &#8216;tu\u1ed5i c\u1ee7a ng\u00f4i nh\u00e0&#8217; (n\u0103m hi\u1ec7n t\u1ea1i &#8211; n\u0103m x\u00e2y d\u1ef1ng) th\u01b0\u1eddng cung c\u1ea5p th\u00f4ng tin h\u1eefu \u00edch h\u01a1n nhi\u1ec1u cho m\u00f4 h\u00ecnh, gi\u00fap d\u1ef1 \u0111o\u00e1n gi\u00e1 ch\u00ednh x\u00e1c h\u01a1n.<\/p>\n<p>Nhi\u1ec1u chuy\u00ean gia gi\u00e0u kinh nghi\u1ec7m kh\u1eb3ng \u0111\u1ecbnh r\u1eb1ng, vi\u1ec7c \u0111\u1ea7u t\u01b0 th\u1eddi gian v\u00e0 c\u00f4ng s\u1ee9c v\u00e0o Feature Engineering th\u01b0\u1eddng mang l\u1ea1i s\u1ef1 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t l\u1edbn h\u01a1n vi\u1ec7c ch\u1ec9 t\u1eadp trung tinh ch\u1ec9nh c\u00e1c tham s\u1ed1 c\u1ee7a thu\u1eadt to\u00e1n ph\u1ee9c t\u1ea1p tr\u00ean nh\u1eefng \u0111\u1eb7c tr\u01b0ng k\u00e9m ch\u1ea5t l\u01b0\u1ee3ng.<\/p>\n<figure id=\"attachment_27096\" aria-describedby=\"caption-attachment-27096\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Vai-tro-cua-Feature-Engineering-trong-Machine-Learning.png\" alt=\"Vai tr\u00f2 c\u1ee7a Feature Engineering trong Machine Learning\" width=\"800\" height=\"417\" class=\"size-full wp-image-27096\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Vai-tro-cua-Feature-Engineering-trong-Machine-Learning.png 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Vai-tro-cua-Feature-Engineering-trong-Machine-Learning-300x156.png 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Vai-tro-cua-Feature-Engineering-trong-Machine-Learning-768x400.png 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Vai-tro-cua-Feature-Engineering-trong-Machine-Learning-750x391.png 750w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-27096\" class=\"wp-caption-text\">Vai tr\u00f2 c\u1ee7a Feature Engineering trong Machine Learning<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Tang-cuong-su-phu-hop-cua-du-lieu-voi-thuat-toan\"><\/span><strong>T\u0103ng c\u01b0\u1eddng s\u1ef1 ph\u00f9 h\u1ee3p c\u1ee7a d\u1eef li\u1ec7u v\u1edbi thu\u1eadt to\u00e1n<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Feature Engineering <strong>\u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o t\u01b0\u01a1ng th\u00edch v\u1edbi y\u00eau c\u1ea7u<\/strong> c\u1ee7a c\u00e1c thu\u1eadt to\u00e1n Machine Learning \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn. \u0110a s\u1ed1 thu\u1eadt to\u00e1n kh\u00f4ng th\u1ec3 x\u1eed l\u00fd tr\u1ef1c ti\u1ebfp d\u1eef li\u1ec7u th\u00f4, \u0111\u1eb7c bi\u1ec7t l\u00e0 d\u1eef li\u1ec7u d\u1ea1ng v\u0103n b\u1ea3n (text) hay d\u1eef li\u1ec7u ph\u00e2n lo\u1ea1i (categorical).<\/p>\n<p>V\u00ed d\u1ee5, k\u1ef9 thu\u1eadt m\u00e3 h\u00f3a nh\u01b0 One-Hot Encoding bi\u1ebfn \u0111\u1ed5i m\u1ed9t \u0111\u1eb7c tr\u01b0ng ph\u00e2n lo\u1ea1i (v\u00ed d\u1ee5: &#8216;m\u00e0u s\u1eafc&#8217; v\u1edbi c\u00e1c gi\u00e1 tr\u1ecb &#8216;\u0111\u1ecf&#8217;, &#8216;xanh&#8217;, &#8216;v\u00e0ng&#8217;) th\u00e0nh c\u00e1c c\u1ed9t nh\u1ecb ph\u00e2n (0\/1). \u0110i\u1ec1u n\u00e0y gi\u00fap c\u00e1c thu\u1eadt to\u00e1n nh\u01b0 h\u1ed3i quy tuy\u1ebfn t\u00ednh ho\u1eb7c m\u1ea1ng n\u01a1-ron c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng th\u00f4ng tin n\u00e0y.<\/p>\n<p>T\u01b0\u01a1ng t\u1ef1, c\u00e1c k\u1ef9 thu\u1eadt chu\u1ea9n h\u00f3a (Scaling) nh\u01b0 Min-Max Scaling ho\u1eb7c Standardization \u0111\u01b0a c\u00e1c \u0111\u1eb7c tr\u01b0ng s\u1ed1 v\u1ec1 c\u00f9ng m\u1ed9t thang \u0111o. Vi\u1ec7c n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c thu\u1eadt to\u00e1n nh\u1ea1y c\u1ea3m v\u1edbi s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 \u0111\u1ed9 l\u1edbn gi\u1eefa c\u00e1c \u0111\u1eb7c tr\u01b0ng, v\u00ed d\u1ee5 nh\u01b0 K-Nearest Neighbors (KNN) hay Support Vector Machines (SVM).<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Giam-do-phuc-tap-va-thoi-gian-huan-luyen\"><\/span><strong>Gi\u1ea3m \u0111\u1ed9 ph\u1ee9c t\u1ea1p v\u00e0 th\u1eddi gian hu\u1ea5n luy\u1ec7n<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Th\u00f4ng qua vi\u1ec7c t\u1ea1o ra c\u00e1c \u0111\u1eb7c tr\u01b0ng c\u00f4 \u0111\u1ecdng th\u00f4ng tin h\u01a1n ho\u1eb7c k\u1ebft h\u1ee3p v\u1edbi Feature Selection (L\u1ef1a ch\u1ecdn \u0111\u1eb7c tr\u01b0ng) \u0111\u1ec3 lo\u1ea1i b\u1ecf c\u00e1c \u0111\u1eb7c tr\u01b0ng kh\u00f4ng li\u00ean quan, Feature Engineering c\u00f3 th\u1ec3 gi\u00fap <strong>gi\u1ea3m s\u1ed1 chi\u1ec1u (dimensionality) c\u1ee7a d\u1eef li\u1ec7u<\/strong> m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n<p>Vi\u1ec7c gi\u1ea3m s\u1ed1 chi\u1ec1u gi\u00fap \u0111\u01a1n gi\u1ea3n h\u00f3a m\u00f4 h\u00ecnh, gi\u1ea3m nguy c\u01a1 qu\u00e1 kh\u1edbp (overfitting) \u2013 t\u00ecnh tr\u1ea1ng m\u00f4 h\u00ecnh h\u1ecdc qu\u00e1 t\u1ed1t tr\u00ean d\u1eef li\u1ec7u hu\u1ea5n luy\u1ec7n nh\u01b0ng l\u1ea1i d\u1ef1 \u0111o\u00e1n k\u00e9m tr\u00ean d\u1eef li\u1ec7u m\u1edbi. M\u00f4 h\u00ecnh \u0111\u01a1n gi\u1ea3n h\u01a1n th\u01b0\u1eddng d\u1ec5 hi\u1ec3u v\u00e0 d\u1ec5 tri\u1ec3n khai h\u01a1n.<\/p>\n<p>D\u1eef li\u1ec7u v\u1edbi \u00edt chi\u1ec1u h\u01a1n v\u00e0 c\u1ea5u tr\u00fac t\u1ed1t h\u01a1n c\u0169ng gi\u00fap gi\u1ea3m \u0111\u00e1ng k\u1ec3 th\u1eddi gian c\u1ea7n thi\u1ebft \u0111\u1ec3 hu\u1ea5n luy\u1ec7n m\u00f4 h\u00ecnh. L\u1ee3i \u00edch n\u00e0y c\u00e0ng r\u00f5 r\u1ec7t khi l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c t\u1eadp d\u1eef li\u1ec7u l\u1edbn (Big Data), ti\u1ebft ki\u1ec7m t\u00e0i nguy\u00ean t\u00ednh to\u00e1n \u0111\u00e1ng k\u1ec3.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Tang-kha-nang-dien-giai-va-hieu-mo-hinh\"><\/span><strong>T\u0103ng kh\u1ea3 n\u0103ng di\u1ec5n gi\u1ea3i v\u00e0 hi\u1ec3u m\u00f4 h\u00ecnh<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Khi c\u00e1c \u0111\u1eb7c tr\u01b0ng \u0111\u01b0\u1ee3c t\u1ea1o ra c\u00f3 \u00fd ngh\u0129a r\u00f5 r\u00e0ng trong b\u1ed1i c\u1ea3nh c\u1ee7a b\u00e0i to\u00e1n (v\u00ed d\u1ee5: &#8216;t\u1ef7 l\u1ec7 nh\u1ea5p chu\u1ed9t&#8217;, &#8216;s\u1ed1 ng\u00e0y k\u1ec3 t\u1eeb l\u1ea7n mua cu\u1ed1i&#8217;), ch\u00fang ta c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng hi\u1ec3u v\u00e0 gi\u1ea3i th\u00edch t\u1ea1i sao m\u00f4 h\u00ecnh l\u1ea1i \u0111\u01b0a ra m\u1ed9t quy\u1ebft \u0111\u1ecbnh hay d\u1ef1 \u0111o\u00e1n c\u1ee5 th\u1ec3.<\/p>\n<p>Kh\u1ea3 n\u0103ng di\u1ec5n gi\u1ea3i (Interpretability) n\u00e0y c\u1ef1c k\u1ef3 quan tr\u1ecdng trong c\u00e1c l\u0129nh v\u1ef1c y\u00eau c\u1ea7u t\u00ednh minh b\u1ea1ch v\u00e0 tr\u00e1ch nhi\u1ec7m gi\u1ea3i tr\u00ecnh cao nh\u01b0 t\u00e0i ch\u00ednh (\u0111\u00e1nh gi\u00e1 t\u00edn d\u1ee5ng), y t\u1ebf (ch\u1ea9n \u0111o\u00e1n b\u1ec7nh). N\u00f3 gi\u00fap x\u00e2y d\u1ef1ng l\u00f2ng tin v\u00e0o c\u00e1c h\u1ec7 th\u1ed1ng d\u1ef1a tr\u00ean Machine Learning.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cach-thuc-hoat-dong-cua-ky-thuat-dac-trung-%E2%80%93-Feature-Engineering\"><\/span><strong>C\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a k\u1ef9 thu\u1eadt \u0111\u1eb7c tr\u01b0ng &#8211; Feature Engineering<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Qu\u00e1 tr\u00ecnh k\u1ef9 thu\u1eadt \u0111\u1eb7c tr\u01b0ng c\u00f3 th\u1ec3 di\u1ec5n ra theo c\u00e1c b\u01b0\u1edbc sau:<\/p>\n<ul>\n<li><strong>T\u1ea1o ra c\u00e1c \u0111\u1eb7c tr\u01b0ng<\/strong> \u2013 Xem x\u00e9t r\u1ea5t nhi\u1ec1u d\u1eef li\u1ec7u, ph\u00e2n t\u00edch k\u1ef9 thu\u1eadt \u0111\u1eb7c tr\u01b0ng trong c\u00e1c v\u1ea5n \u0111\u1ec1 kh\u00e1c v\u00e0 x\u00e1c \u0111\u1ecbnh nh\u1eefng g\u00ec c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng t\u1eeb ch\u00fang.<\/li>\n<li><strong>\u0110\u1ecbnh ngh\u0129a c\u00e1c \u0111\u1eb7c tr\u01b0ng<\/strong> \u2013 Bao g\u1ed3m hai quy tr\u00ecnh: r\u00fat tr\u00edch \u0111\u1eb7c tr\u01b0ng, quy tr\u00ecnh x\u00e1c \u0111\u1ecbnh v\u00e0 r\u00fat tr\u00edch m\u1ed9t b\u1ed9 c\u00e1c \u0111\u1eb7c tr\u01b0ng \u0111\u1ea1i di\u1ec7n cho d\u1eef li\u1ec7u quan tr\u1ecdng \u0111\u1ed1i v\u1edbi ph\u00e2n t\u00edch; v\u00e0 x\u00e2y d\u1ef1ng \u0111\u1eb7c tr\u01b0ng, quy tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i m\u1ed9t b\u1ed9 \u0111\u1eb7c tr\u01b0ng \u0111\u1ea7u v\u00e0o c\u1ee5 th\u1ec3 th\u00e0nh m\u1ed9t b\u1ed9 \u0111\u1eb7c tr\u01b0ng m\u1edbi, hi\u1ec7u qu\u1ea3 h\u01a1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng cho d\u1ef1 \u0111o\u00e1n. T\u00f9y thu\u1ed9c v\u00e0o v\u1ea5n \u0111\u1ec1, ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 ch\u1ecdn s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p r\u00fat tr\u00edch \u0111\u1eb7c tr\u01b0ng t\u1ef1 \u0111\u1ed9ng, x\u00e2y d\u1ef1ng \u0111\u1eb7c tr\u01b0ng th\u1ee7 c\u00f4ng ho\u1eb7c k\u1ebft h\u1ee3p c\u1ea3 hai.<\/li>\n<li><strong>L\u1ef1a ch\u1ecdn c\u00e1c \u0111\u1eb7c tr\u01b0ng<\/strong> \u2013 Khi ng\u01b0\u1eddi d\u00f9ng \u0111\u00e3 bi\u1ebft m\u1ed9t s\u1ed1 th\u00f4ng tin v\u1ec1 d\u1eef li\u1ec7u v\u00e0 \u0111\u00e3 \u0111\u1ecbnh ngh\u0129a c\u00e1c \u0111\u1eb7c tr\u01b0ng ti\u1ec1m n\u0103ng, b\u01b0\u1edbc ti\u1ebfp theo l\u00e0 ch\u1ecdn c\u00e1c \u0111\u1eb7c tr\u01b0ng ph\u00f9 h\u1ee3p. \u0110i\u1ec1u n\u00e0y bao g\u1ed3m hai y\u1ebfu t\u1ed1: l\u1ef1a ch\u1ecdn \u0111\u1eb7c tr\u01b0ng, quy tr\u00ecnh ch\u1ecdn m\u1ed9t t\u1eadp con c\u1ee7a c\u00e1c \u0111\u1eb7c tr\u01b0ng c\u00f3 li\u00ean quan nh\u1ea5t \u0111\u1ed1i v\u1edbi m\u1ed9t nhi\u1ec7m v\u1ee5 c\u1ee5 th\u1ec3; v\u00e0 \u0111\u00e1nh gi\u00e1 \u0111\u1eb7c tr\u01b0ng, qu\u00e1 tr\u00ecnh \u0111\u00e1nh gi\u00e1 m\u1ee9c \u0111\u1ed9 h\u1eefu \u00edch c\u1ee7a m\u1ed9t \u0111\u1eb7c tr\u01b0ng \u0111\u1ed1i v\u1edbi d\u1ef1 \u0111o\u00e1n.<\/li>\n<li><strong>\u0110\u00e1nh gi\u00e1 m\u00f4 h\u00ecnh<\/strong> \u2013 \u0110\u00e1nh gi\u00e1 c\u00e1c \u0111\u1eb7c tr\u01b0ng b\u1eb1ng c\u00e1ch \u0111\u00e1nh gi\u00e1 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a m\u00f4 h\u00ecnh tr\u00ean d\u1eef li\u1ec7u ch\u01b0a th\u1ea5y tr\u01b0\u1edbc \u0111\u00f3 b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c \u0111\u1eb7c tr\u01b0ng \u0111\u00e3 ch\u1ecdn.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Ky-thuat-Feature-Engineering\"><\/span><strong>K\u1ef9 thu\u1eadt Feature Engineering<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>C\u00e1c k\u1ef9 thu\u1eadt Feature Engineering bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>\u0110i\u1ec1n gi\u00e1 tr\u1ecb thi\u1ebfu (Imputation)<\/strong> \u2013 M\u1ed9t v\u1ea5n \u0111\u1ec1 ph\u1ed5 bi\u1ebfn trong h\u1ecdc m\u00e1y l\u00e0 s\u1ef1 thi\u1ebfu gi\u00e1 tr\u1ecb trong b\u1ed9 d\u1eef li\u1ec7u, \u0111i\u1ec1u n\u00e0y \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1ch c\u00e1c thu\u1eadt to\u00e1n h\u1ecdc m\u00e1y ho\u1ea1t \u0111\u1ed9ng. \u0110i\u1ec1n gi\u00e1 tr\u1ecb thi\u1ebfu l\u00e0 qu\u00e1 tr\u00ecnh thay th\u1ebf d\u1eef li\u1ec7u thi\u1ebfu b\u1eb1ng c\u00e1c \u01b0\u1edbc l\u01b0\u1ee3ng th\u1ed1ng k\u00ea c\u1ee7a gi\u00e1 tr\u1ecb b\u1ecb thi\u1ebfu, t\u1ea1o ra m\u1ed9t b\u1ed9 d\u1eef li\u1ec7u ho\u00e0n ch\u1ec9nh \u0111\u1ec3 s\u1eed d\u1ee5ng trong vi\u1ec7c hu\u1ea5n luy\u1ec7n c\u00e1c m\u00f4 h\u00ecnh h\u1ecdc m\u00e1y.<\/li>\n<li><strong>M\u00e3 h\u00f3a one-hot (One-hot encoding)<\/strong> \u2013 L\u00e0 qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i d\u1eef li\u1ec7u ph\u00e2n lo\u1ea1i th\u00e0nh m\u1ed9t d\u1ea1ng m\u00e0 thu\u1eadt to\u00e1n h\u1ecdc m\u00e1y c\u00f3 th\u1ec3 hi\u1ec3u \u0111\u01b0\u1ee3c \u0111\u1ec3 \u0111\u01b0a ra d\u1ef1 \u0111o\u00e1n ch\u00ednh x\u00e1c h\u01a1n.<\/li>\n<li><strong>Bao b\u00ec t\u1eeb (Bag of words)<\/strong> \u2013 L\u00e0 thu\u1eadt to\u00e1n \u0111\u1ebfm s\u1ed1 l\u1ea7n m\u1ed9t t\u1eeb xu\u1ea5t hi\u1ec7n trong m\u1ed9t t\u00e0i li\u1ec7u. N\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh s\u1ef1 t\u01b0\u01a1ng \u0111\u1ed3ng v\u00e0 kh\u00e1c bi\u1ec7t trong c\u00e1c t\u00e0i li\u1ec7u, ph\u1ee5c v\u1ee5 cho c\u00e1c \u1ee9ng d\u1ee5ng nh\u01b0 t\u00ecm ki\u1ebfm v\u00e0 ph\u00e2n lo\u1ea1i t\u00e0i li\u1ec7u.<\/li>\n<li><strong>K\u1ef9 thu\u1eadt \u0111\u1eb7c tr\u01b0ng t\u1ef1 \u0111\u1ed9ng (Automated feature engineering)<\/strong> \u2013 K\u1ef9 thu\u1eadt n\u00e0y gi\u00fap r\u00fat ra c\u00e1c \u0111\u1eb7c tr\u01b0ng h\u1eefu \u00edch v\u00e0 c\u00f3 \u00fd ngh\u0129a b\u1eb1ng m\u1ed9t khu\u00f4n kh\u1ed5 c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng cho b\u1ea5t k\u1ef3 v\u1ea5n \u0111\u1ec1 n\u00e0o. K\u1ef9 thu\u1eadt \u0111\u1eb7c tr\u01b0ng t\u1ef1 \u0111\u1ed9ng gi\u00fap c\u00e1c nh\u00e0 khoa h\u1ecdc d\u1eef li\u1ec7u l\u00e0m vi\u1ec7c hi\u1ec7u qu\u1ea3 h\u01a1n, v\u00ec h\u1ecd c\u00f3 th\u1ec3 d\u00e0nh nhi\u1ec1u th\u1eddi gian h\u01a1n cho c\u00e1c th\u00e0nh ph\u1ea7n kh\u00e1c trong h\u1ecdc m\u00e1y. K\u1ef9 thu\u1eadt n\u00e0y c\u0169ng cho ph\u00e9p c\u00e1c nh\u00e0 khoa h\u1ecdc d\u1eef li\u1ec7u c\u00f4ng d\u00e2n th\u1ef1c hi\u1ec7n k\u1ef9 thu\u1eadt \u0111\u1eb7c tr\u01b0ng b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p d\u1ef1a tr\u00ean khu\u00f4n kh\u1ed5.<\/li>\n<li><strong>Ph\u00e2n nh\u00f3m (Binning)<\/strong> \u2013 Ph\u00e2n nh\u00f3m, hay nh\u00f3m d\u1eef li\u1ec7u, l\u00e0 y\u1ebfu t\u1ed1 quan tr\u1ecdng trong vi\u1ec7c chu\u1ea9n b\u1ecb d\u1eef li\u1ec7u s\u1ed1 cho h\u1ecdc m\u00e1y. K\u1ef9 thu\u1eadt n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 thay th\u1ebf m\u1ed9t c\u1ed9t s\u1ed1 b\u1eb1ng c\u00e1c gi\u00e1 tr\u1ecb ph\u00e2n lo\u1ea1i \u0111\u1ea1i di\u1ec7n cho c\u00e1c kho\u1ea3ng gi\u00e1 tr\u1ecb c\u1ee5 th\u1ec3.<\/li>\n<li><strong>N-gram<\/strong> \u2013 Gi\u00fap d\u1ef1 \u0111o\u00e1n m\u1ee5c ti\u1ebfp theo trong m\u1ed9t chu\u1ed7i. Trong ph\u00e2n t\u00edch c\u1ea3m x\u00fac, m\u00f4 h\u00ecnh n-gram gi\u00fap ph\u00e2n t\u00edch c\u1ea3m x\u00fac c\u1ee7a v\u0103n b\u1ea3n ho\u1eb7c t\u00e0i li\u1ec7u.<\/li>\n<li><strong>K\u1ebft h\u1ee3p \u0111\u1eb7c tr\u01b0ng (Feature crosses)<\/strong> \u2013 L\u00e0 c\u00e1ch k\u1ebft h\u1ee3p hai ho\u1eb7c nhi\u1ec1u \u0111\u1eb7c tr\u01b0ng ph\u00e2n lo\u1ea1i th\u00e0nh m\u1ed9t \u0111\u1eb7c tr\u01b0ng. K\u1ef9 thu\u1eadt n\u00e0y \u0111\u1eb7c bi\u1ec7t h\u1eefu \u00edch khi m\u1ed9t s\u1ed1 \u0111\u1eb7c tr\u01b0ng k\u1ebft h\u1ee3p l\u1ea1i th\u1ec3 hi\u1ec7n t\u1ed1t h\u01a1n m\u1ed9t thu\u1ed9c t\u00ednh n\u00e0o \u0111\u00f3 so v\u1edbi khi ch\u00fang ri\u00eang l\u1ebb.<\/li>\n<\/ul>\n<p>M\u1ed9t s\u1ed1 th\u01b0 vi\u1ec7n m\u00e3 ngu\u1ed3n m\u1edf Python h\u1ed7 tr\u1ee3 c\u00e1c k\u1ef9 thu\u1eadt Feature Engineering, bao g\u1ed3m th\u01b0 vi\u1ec7n Featuretools \u0111\u1ec3 t\u1ef1 \u0111\u1ed9ng t\u1ea1o ra c\u00e1c \u0111\u1eb7c tr\u01b0ng t\u1eeb m\u1ed9t b\u1ed9 c\u00e1c b\u1ea3ng li\u00ean quan b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng t\u1ed5ng h\u1ee3p \u0111\u1eb7c tr\u01b0ng s\u00e2u (deep feature synthesis), m\u1ed9t thu\u1eadt to\u00e1n t\u1ef1 \u0111\u1ed9ng t\u1ea1o ra c\u00e1c \u0111\u1eb7c tr\u01b0ng cho c\u00e1c b\u1ed9 d\u1eef li\u1ec7u quan h\u1ec7.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cac-thuat-ngu-pho-bien-lien-quan-den-Feature-Engineering\"><\/span><strong>C\u00e1c thu\u1eadt ng\u1eef ph\u1ed5 bi\u1ebfn li\u00ean quan \u0111\u1ebfn Feature Engineering<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Trong Feature Engineering v\u00e0 l\u0129nh v\u1ef1c Machine Learning n\u00f3i chung, c\u00f3 nhi\u1ec1u thu\u1eadt ng\u1eef quan tr\u1ecdng b\u1ea1n c\u1ea7n hi\u1ec3u r\u00f5. Bao g\u1ed3m Feature, Raw Data, Feature Selection, Feature Extraction, Encoding, Scaling, Imputation, v\u00e0 Binning. N\u1eafm v\u1eefng c\u00e1c kh\u00e1i ni\u1ec7m n\u00e0y s\u1ebd gi\u00fap b\u1ea1n th\u1ef1c hi\u1ec7n quy tr\u00ecnh hi\u1ec7u qu\u1ea3 h\u01a1n.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Feature-Dac-trung\"><\/span><strong>Feature (\u0110\u1eb7c tr\u01b0ng)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Feature, hay \u0111\u1eb7c tr\u01b0ng, l\u00e0 m\u1ed9t thu\u1ed9c t\u00ednh ho\u1eb7c bi\u1ebfn s\u1ed1 ri\u00eang l\u1ebb, c\u00f3 th\u1ec3 \u0111o l\u01b0\u1eddng \u0111\u01b0\u1ee3c, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m \u0111\u1ea7u v\u00e0o cho m\u00f4 h\u00ecnh Machine Learning. N\u00f3 \u0111\u1ea1i di\u1ec7n cho m\u1ed9t kh\u00eda c\u1ea1nh c\u1ee5 th\u1ec3 c\u1ee7a d\u1eef li\u1ec7u th\u00f4 \u0111\u00e3 \u0111\u01b0\u1ee3c x\u1eed l\u00fd ho\u1eb7c l\u1ef1a ch\u1ecdn c\u1ea9n th\u1eadn.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Raw-Data-Du-lieu-tho\"><\/span><strong>Raw Data (D\u1eef li\u1ec7u th\u00f4)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Raw Data l\u00e0 d\u1eef li\u1ec7u \u1edf tr\u1ea1ng th\u00e1i ban \u0111\u1ea7u, ngay sau khi \u0111\u01b0\u1ee3c thu th\u1eadp v\u00e0 tr\u01b0\u1edbc khi tr\u1ea3i qua b\u1ea5t k\u1ef3 qu\u00e1 tr\u00ecnh x\u1eed l\u00fd, l\u00e0m s\u1ea1ch hay bi\u1ebfn \u0111\u1ed5i n\u00e0o \u0111\u00e1ng k\u1ec3. D\u1eef li\u1ec7u n\u00e0y th\u01b0\u1eddng ch\u1ee9a l\u1ed7i, gi\u00e1 tr\u1ecb thi\u1ebfu, \u0111\u1ecbnh d\u1ea1ng kh\u00f4ng nh\u1ea5t qu\u00e1n v\u00e0 nhi\u1ec5u.<\/p>\n<p>Feature Engineering ch\u00ednh l\u00e0 c\u1ea7u n\u1ed1i quan tr\u1ecdng, bi\u1ebfn \u0111\u1ed5i Raw Data l\u1ed9n x\u1ed9n n\u00e0y th\u00e0nh c\u00e1c Features c\u00f3 c\u1ea5u tr\u00fac, s\u1ea1ch s\u1ebd v\u00e0 \u00fd ngh\u0129a. Qu\u00e1 tr\u00ecnh n\u00e0y tr\u00edch xu\u1ea5t th\u00f4ng tin gi\u00e1 tr\u1ecb ti\u1ec1m \u1ea9n trong d\u1eef li\u1ec7u th\u00f4 \u0111\u1ec3 m\u00f4 h\u00ecnh c\u00f3 th\u1ec3 h\u1ecdc \u0111\u01b0\u1ee3c.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Feature-Selection-Lua-chon-dac-trung\"><\/span><strong>Feature Selection (L\u1ef1a ch\u1ecdn \u0111\u1eb7c tr\u01b0ng)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Feature Selection l\u00e0 qu\u00e1 tr\u00ecnh t\u1ef1 \u0111\u1ed9ng ho\u1eb7c th\u1ee7 c\u00f4ng nh\u1eb1m ch\u1ecdn ra m\u1ed9t t\u1eadp h\u1ee3p con c\u00e1c features ph\u00f9 h\u1ee3p nh\u1ea5t t\u1eeb t\u1eadp features ban \u0111\u1ea7u ho\u1eb7c \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ea1o ra. M\u1ee5c ti\u00eau l\u00e0 lo\u1ea1i b\u1ecf nh\u1eefng features kh\u00f4ng li\u00ean quan, d\u01b0 th\u1eeba ho\u1eb7c \u00edt th\u00f4ng tin.<\/p>\n<p>Ho\u1ea1t \u0111\u1ed9ng n\u00e0y kh\u00e1c bi\u1ec7t v\u1edbi Feature Engineering &#8211; v\u1ed1n t\u1eadp trung v\u00e0o vi\u1ec7c t\u1ea1o m\u1edbi ho\u1eb7c bi\u1ebfn \u0111\u1ed5i features. Feature Selection ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 &#8220;ch\u1ecdn l\u1ecdc&#8221; t\u1eeb nh\u1eefng g\u00ec \u0111\u00e3 c\u00f3, th\u01b0\u1eddng di\u1ec5n ra sau ho\u1eb7c song song v\u1edbi Feature Engineering \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a m\u00f4 h\u00ecnh cu\u1ed1i c\u00f9ng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Feature-Extraction-Trich-xuat-dac-trung\"><\/span><strong>Feature Extraction (Tr\u00edch xu\u1ea5t \u0111\u1eb7c tr\u01b0ng)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Feature Extraction l\u00e0 k\u1ef9 thu\u1eadt t\u1ea1o ra c\u00e1c features m\u1edbi t\u1eeb c\u00e1c features ban \u0111\u1ea7u th\u00f4ng qua c\u00e1c ph\u00e9p bi\u1ebfn \u0111\u1ed5i to\u00e1n h\u1ecdc. C\u00e1c features m\u1edbi n\u00e0y th\u01b0\u1eddng c\u00f3 s\u1ed1 chi\u1ec1u th\u1ea5p h\u01a1n v\u00e0 c\u00f3 th\u1ec3 kh\u00f4ng gi\u1eef nguy\u00ean \u00fd ngh\u0129a v\u1eadt l\u00fd ban \u0111\u1ea7u c\u1ee7a d\u1eef li\u1ec7u.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Encoding-Ma-hoa\"><\/span><strong>Encoding (M\u00e3 h\u00f3a)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Encoding l\u00e0 qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i d\u1eef li\u1ec7u t\u1eeb d\u1ea1ng ph\u00e2n lo\u1ea1i (categorical), v\u00ed d\u1ee5 nh\u01b0 v\u0103n b\u1ea3n ho\u1eb7c nh\u00e3n (&#8216;Nam&#8217;\/&#8217;N\u1eef&#8217;, &#8216;Th\u00e0nh ph\u1ed1 A&#8217;\/&#8217;Th\u00e0nh ph\u1ed1 B&#8217;), sang d\u1ea1ng s\u1ed1 m\u00e0 c\u00e1c thu\u1eadt to\u00e1n Machine Learning c\u00f3 th\u1ec3 hi\u1ec3u v\u00e0 x\u1eed l\u00fd \u0111\u01b0\u1ee3c.<\/p>\n<p>K\u1ef9 thu\u1eadt One-Hot Encoding r\u1ea5t ph\u1ed5 bi\u1ebfn, n\u00f3 t\u1ea1o ra c\u00e1c c\u1ed9t nh\u1ecb ph\u00e2n m\u1edbi (ch\u1ec9 ch\u1ee9a gi\u00e1 tr\u1ecb 0 ho\u1eb7c 1) cho m\u1ed7i gi\u00e1 tr\u1ecb duy nh\u1ea5t c\u1ee7a feature ph\u00e2n lo\u1ea1i g\u1ed1c. V\u00ed d\u1ee5, feature &#8216;Ph\u01b0\u01a1ng ti\u1ec7n&#8217; c\u00f3 gi\u00e1 tr\u1ecb [&#8216;Xe m\u00e1y&#8217;, &#8216;\u00d4 t\u00f4&#8217;] s\u1ebd th\u00e0nh 2 c\u1ed9t m\u1edbi.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"ScalingNormalization-Chuan-hoaQuy-ve-thang-do\"><\/span><strong>Scaling\/Normalization (Chu\u1ea9n h\u00f3a\/Quy v\u1ec1 thang \u0111o)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Scaling (hay Normalization) l\u00e0 vi\u1ec7c \u0111i\u1ec1u ch\u1ec9nh ph\u1ea1m vi gi\u00e1 tr\u1ecb c\u1ee7a c\u00e1c features d\u1ea1ng s\u1ed1 (numerical) v\u1ec1 m\u1ed9t thang \u0111o chung, v\u00ed d\u1ee5 nh\u01b0 t\u1eeb 0 \u0111\u1ebfn 1 ho\u1eb7c c\u00f3 trung b\u00ecnh 0 v\u00e0 \u0111\u1ed9 l\u1ec7ch chu\u1ea9n 1. Vi\u1ec7c n\u00e0y r\u1ea5t quan tr\u1ecdng cho nhi\u1ec1u thu\u1eadt to\u00e1n.<\/p>\n<p>N\u00f3 gi\u00fap \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c features c\u00f3 \u0111\u01a1n v\u1ecb \u0111o ho\u1eb7c kho\u1ea3ng gi\u00e1 tr\u1ecb kh\u00e1c nhau (v\u00ed d\u1ee5: &#8216;tu\u1ed5i&#8217; t\u1eeb 0-100 v\u00e0 &#8216;thu nh\u1eadp&#8217; h\u00e0ng tri\u1ec7u) c\u00f3 t\u1ea7m \u1ea3nh h\u01b0\u1edfng t\u01b0\u01a1ng \u0111\u01b0\u01a1ng l\u00ean m\u00f4 h\u00ecnh, tr\u00e1nh vi\u1ec7c feature c\u00f3 gi\u00e1 tr\u1ecb l\u1edbn h\u01a1n l\u1ea5n \u00e1t c\u00e1c feature kh\u00e1c.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Imputation-Gan-gia-tri-thieu\"><\/span><strong>Imputation (G\u00e1n gi\u00e1 tr\u1ecb thi\u1ebfu)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Imputation l\u00e0 t\u00ean g\u1ecdi chung cho c\u00e1c k\u1ef9 thu\u1eadt x\u1eed l\u00fd gi\u00e1 tr\u1ecb b\u1ecb thi\u1ebfu (missing values hay NaN) trong t\u1eadp d\u1eef li\u1ec7u. Thay v\u00ec lo\u1ea1i b\u1ecf c\u00e1c h\u00e0ng ho\u1eb7c c\u1ed9t ch\u1ee9a gi\u00e1 tr\u1ecb thi\u1ebfu (c\u00f3 th\u1ec3 l\u00e0m m\u1ea5t th\u00f4ng tin), imputation c\u1ed1 g\u1eafng \u0111i\u1ec1n v\u00e0o c\u00e1c kho\u1ea3ng tr\u1ed1ng \u0111\u00f3.<\/p>\n<p>C\u00e1c ph\u01b0\u01a1ng ph\u00e1p imputation ph\u1ed5 bi\u1ebfn bao g\u1ed3m thay th\u1ebf gi\u00e1 tr\u1ecb thi\u1ebfu b\u1eb1ng gi\u00e1 tr\u1ecb trung b\u00ecnh (mean), trung v\u1ecb (median), ho\u1eb7c gi\u00e1 tr\u1ecb xu\u1ea5t hi\u1ec7n nhi\u1ec1u nh\u1ea5t (mode) c\u1ee7a c\u1ed9t \u0111\u00f3. C\u00e1c k\u1ef9 thu\u1eadt ph\u1ee9c t\u1ea1p h\u01a1n c\u00f3 th\u1ec3 d\u00f9ng m\u00f4 h\u00ecnh kh\u00e1c \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n gi\u00e1 tr\u1ecb thi\u1ebfu.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"BinningDiscretization-Roi-rac-hoa\"><\/span><strong>Binning\/Discretization (R\u1eddi r\u1ea1c h\u00f3a)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Binning (hay Discretization) l\u00e0 qu\u00e1 tr\u00ecnh chia m\u1ed9t feature s\u1ed1 li\u00ean t\u1ee5c (v\u00ed d\u1ee5: &#8216;tu\u1ed5i&#8217;, &#8216;thu nh\u1eadp&#8217;) th\u00e0nh m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng h\u1eefu h\u1ea1n c\u00e1c kho\u1ea3ng (bins) ho\u1eb7c nh\u00f3m r\u1eddi r\u1ea1c. M\u1ed7i kho\u1ea3ng n\u00e0y \u0111\u01b0\u1ee3c xem nh\u01b0 m\u1ed9t category.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Mot-so-thach-thuc-cua-Feature-Engineering\"><\/span><strong>M\u1ed9t s\u1ed1 th\u00e1ch th\u1ee9c c\u1ee7a Feature Engineering<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Nh\u1eefng th\u00e1ch th\u1ee9c khi th\u1ef1c hi\u1ec7n feature engineering l\u00e0 g\u00ec? M\u1eb7c d\u00f9 \u0111\u00f3ng vai tr\u00f2 c\u1ef1c k\u1ef3 quan tr\u1ecdng, quy tr\u00ecnh Feature Engineering c\u0169ng \u0111\u1ed1i m\u1eb7t v\u1edbi kh\u00f4ng \u00edt th\u00e1ch th\u1ee9c \u0111\u00e1ng k\u1ec3. C\u00e1c kh\u00f3 kh\u0103n ch\u00ednh bao g\u1ed3m y\u00eau c\u1ea7u ki\u1ebfn th\u1ee9c chuy\u00ean m\u00f4n s\u00e2u, t\u1ed1n nhi\u1ec1u th\u1eddi gian, ti\u1ec1m \u1ea9n nguy c\u01a1 r\u00f2 r\u1ec9 d\u1eef li\u1ec7u v\u00e0 \u0111\u00f4i khi mang t\u00ednh &#8216;ngh\u1ec7 thu\u1eadt&#8217; kh\u00f3 h\u1ec7 th\u1ed1ng h\u00f3a.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Yeu-cau-kien-thuc-chuyen-mon-Domain-Knowledge\"><\/span><strong>Y\u00eau c\u1ea7u ki\u1ebfn th\u1ee9c chuy\u00ean m\u00f4n (Domain Knowledge)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u1ec3 t\u1ea1o ra c\u00e1c features th\u1ef1c s\u1ef1 c\u00f3 gi\u00e1 tr\u1ecb v\u00e0 \u00fd ngh\u0129a, ng\u01b0\u1eddi th\u1ef1c hi\u1ec7n c\u1ea7n <strong>hi\u1ec3u bi\u1ebft s\u00e2u s\u1eafc v\u1ec1 l\u0129nh v\u1ef1c c\u1ee7a d\u1eef li\u1ec7u<\/strong> (domain knowledge). N\u1ebfu kh\u00f4ng hi\u1ec3u r\u00f5 b\u1ed1i c\u1ea3nh nghi\u1ec7p v\u1ee5, r\u1ea5t kh\u00f3 \u0111\u1ec3 bi\u1ebft n\u00ean k\u1ebft h\u1ee3p, bi\u1ebfn \u0111\u1ed5i hay t\u1ea1o ra th\u00f4ng tin n\u00e0o t\u1eeb d\u1eef li\u1ec7u g\u1ed1c.<\/p>\n<p>V\u00ed d\u1ee5, trong l\u0129nh v\u1ef1c t\u00e0i ch\u00ednh ng\u00e2n h\u00e0ng, vi\u1ec7c t\u1ea1o ra feature &#8216;t\u1ef7 l\u1ec7 n\u1ee3 tr\u00ean thu nh\u1eadp&#8217; t\u1eeb c\u00e1c c\u1ed9t d\u1eef li\u1ec7u g\u1ed1c \u0111\u00f2i h\u1ecfi s\u1ef1 am hi\u1ec3u v\u1ec1 c\u00e1c ch\u1ec9 s\u1ed1 t\u00e0i ch\u00ednh quan tr\u1ecdng, ch\u1ee9 kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 c\u00e1c ph\u00e9p t\u00ednh to\u00e1n h\u1ecdc tr\u00ean d\u1eef li\u1ec7u.<\/p>\n<p>S\u1ef1 thi\u1ebfu h\u1ee5t ki\u1ebfn th\u1ee9c chuy\u00ean m\u00f4n c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn vi\u1ec7c t\u1ea1o ra c\u00e1c features kh\u00f4ng li\u00ean quan, sai l\u1ec7ch ho\u1eb7c b\u1ecf l\u1ee1 nh\u1eefng th\u00f4ng tin quan tr\u1ecdng \u1ea9n gi\u1ea5u trong d\u1eef li\u1ec7u, l\u00e0m gi\u1ea3m hi\u1ec7u qu\u1ea3 c\u1ee7a m\u00f4 h\u00ecnh cu\u1ed1i c\u00f9ng m\u1ed9t c\u00e1ch \u0111\u00e1ng ti\u1ebfc.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Ton-nhieu-thoi-gian-va-cong-suc\"><\/span><strong>T\u1ed1n nhi\u1ec1u th\u1eddi gian v\u00e0 c\u00f4ng s\u1ee9c<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Feature Engineering kh\u00f4ng ph\u1ea3i l\u00e0 c\u00f4ng vi\u1ec7c l\u00e0m m\u1ed9t l\u1ea7n l\u00e0 xong. N\u00f3 l\u00e0 m\u1ed9t <strong>qu\u00e1 tr\u00ecnh l\u1eb7p \u0111i l\u1eb7p l\u1ea1i, \u0111\u00f2i h\u1ecfi s\u1ef1 th\u1eed nghi\u1ec7m li\u00ean t\u1ee5c<\/strong> c\u00e1c \u00fd t\u01b0\u1edfng kh\u00e1c nhau, \u0111\u00e1nh gi\u00e1 c\u1ea9n th\u1eadn k\u1ebft qu\u1ea3 v\u00e0 tinh ch\u1ec9nh kh\u00f4ng ng\u1eebng. Qu\u00e1 tr\u00ecnh n\u00e0y ti\u00eau t\u1ed1n r\u1ea5t nhi\u1ec1u th\u1eddi gian v\u00e0 ngu\u1ed3n l\u1ef1c.<\/p>\n<p>C\u00e1c nh\u00e0 khoa h\u1ecdc d\u1eef li\u1ec7u (Data Scientists) c\u00f3 th\u1ec3 ph\u1ea3i d\u00e0nh ph\u1ea7n l\u1edbn th\u1eddi gian c\u1ee7a d\u1ef1 \u00e1n ch\u1ec9 \u0111\u1ec3 chu\u1ea9n b\u1ecb v\u00e0 t\u1ea1o \u0111\u1eb7c tr\u01b0ng cho d\u1eef li\u1ec7u. Vi\u1ec7c th\u1eed nghi\u1ec7m h\u00e0ng ch\u1ee5c, th\u1eadm ch\u00ed h\u00e0ng tr\u0103m gi\u1ea3 thuy\u1ebft v\u1ec1 feature m\u1edbi l\u00e0 \u0111i\u1ec1u kh\u00e1 ph\u1ed5 bi\u1ebfn trong c\u00e1c d\u1ef1 \u00e1n th\u1ef1c t\u1ebf.<\/p>\n<figure id=\"attachment_27098\" aria-describedby=\"caption-attachment-27098\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Mot-so-thach-thuc-cua-Feature-Engineering.png\" alt=\"M\u1ed9t s\u1ed1 th\u00e1ch th\u1ee9c c\u1ee7a Feature Engineering\" width=\"800\" height=\"500\" class=\"size-full wp-image-27098\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Mot-so-thach-thuc-cua-Feature-Engineering.png 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Mot-so-thach-thuc-cua-Feature-Engineering-300x188.png 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Mot-so-thach-thuc-cua-Feature-Engineering-768x480.png 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Mot-so-thach-thuc-cua-Feature-Engineering-750x469.png 750w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-27098\" class=\"wp-caption-text\">M\u1ed9t s\u1ed1 th\u00e1ch th\u1ee9c c\u1ee7a Feature Engineering<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Tinh-%E2%80%9CNghe-thuat%E2%80%9D-va-kho-he-thong-hoa\"><\/span><strong>T\u00ednh &#8220;Ngh\u1ec7 thu\u1eadt&#8221; v\u00e0 kh\u00f3 h\u1ec7 th\u1ed1ng h\u00f3a<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Kh\u00f4ng c\u00f3 m\u1ed9t c\u00f4ng th\u1ee9c hay quy tr\u00ecnh chu\u1ea9n m\u1ef1c duy nh\u1ea5t n\u00e0o \u0111\u1ea3m b\u1ea3o t\u1ea1o ra \u0111\u01b0\u1ee3c c\u00e1c features t\u1ed1t nh\u1ea5t cho m\u1ecdi b\u00e0i to\u00e1n. Feature Engineering th\u01b0\u1eddng <strong>\u0111\u00f2i h\u1ecfi s\u1ef1 s\u00e1ng t\u1ea1o, tr\u1ef1c gi\u00e1c v\u00e0 kinh nghi\u1ec7m th\u1ef1c t\u1ebf<\/strong>, \u0111\u00f4i khi gi\u1ed1ng m\u1ed9t &#8220;ngh\u1ec7 thu\u1eadt&#8221; h\u01a1n l\u00e0 khoa h\u1ecdc thu\u1ea7n t\u00fay.<\/p>\n<p>Ch\u00ednh v\u00ec y\u1ebfu t\u1ed1 &#8220;ngh\u1ec7 thu\u1eadt&#8221; n\u00e0y, vi\u1ec7c h\u1ec7 th\u1ed1ng h\u00f3a hay t\u1ef1 \u0111\u1ed9ng h\u00f3a ho\u00e0n to\u00e0n quy tr\u00ecnh Feature Engineering tr\u1edf n\u00ean r\u1ea5t th\u00e1ch th\u1ee9c. M\u1eb7c d\u00f9 c\u00e1c c\u00f4ng c\u1ee5 AutoML (Automated Machine Learning) \u0111ang c\u1ed1 g\u1eafng gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0y, vai tr\u00f2 c\u1ee7a con ng\u01b0\u1eddi v\u1eabn c\u00f2n r\u1ea5t l\u1edbn.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Nguy-co-ro-ri-du-lieu-Data-Leakage\"><\/span><strong>Nguy c\u01a1 r\u00f2 r\u1ec9 d\u1eef li\u1ec7u (Data Leakage)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng c\u1ea1m b\u1eaby nguy hi\u1ec3m v\u00e0 d\u1ec5 m\u1eafc ph\u1ea3i nh\u1ea5t trong Feature Engineering. Data Leakage x\u1ea3y ra khi th\u00f4ng tin t\u1eeb b\u00ean ngo\u00e0i t\u1eadp hu\u1ea5n luy\u1ec7n (v\u00ed d\u1ee5: t\u1eeb t\u1eadp ki\u1ec3m tra ho\u1eb7c t\u1eeb ch\u00ednh bi\u1ebfn m\u1ee5c ti\u00eau) v\u00f4 t\u00ecnh b\u1ecb r\u00f2 r\u1ec9 v\u00e0o qu\u00e1 tr\u00ecnh t\u1ea1o feature cho t\u1eadp hu\u1ea5n luy\u1ec7n.<\/p>\n<p>H\u1eadu qu\u1ea3 l\u00e0 m\u00f4 h\u00ecnh \u0111\u1ea1t \u0111\u01b0\u1ee3c hi\u1ec7u su\u1ea5t cao m\u1ed9t c\u00e1ch gi\u1ea3 t\u1ea1o trong qu\u00e1 tr\u00ecnh \u0111\u00e1nh gi\u00e1 (validation) nh\u01b0ng l\u1ea1i ho\u1ea1t \u0111\u1ed9ng r\u1ea5t k\u00e9m khi tri\u1ec3n khai tr\u00ean d\u1eef li\u1ec7u th\u1ef1c t\u1ebf ch\u01b0a t\u1eebng th\u1ea5y. C\u1ea7n h\u1ebft s\u1ee9c c\u1ea9n tr\u1ecdng trong t\u1eebng b\u01b0\u1edbc bi\u1ebfn \u0111\u1ed5i d\u1eef li\u1ec7u \u0111\u1ec3 tr\u00e1nh l\u1ed7i n\u00e0y.<\/p>\n<p>V\u00ed d\u1ee5 ph\u1ed5 bi\u1ebfn c\u1ee7a Data Leakage l\u00e0 vi\u1ec7c t\u00ednh to\u00e1n c\u00e1c gi\u00e1 tr\u1ecb th\u1ed1ng k\u00ea (nh\u01b0 mean, median, min, max) \u0111\u1ec3 scaling ho\u1eb7c imputation tr\u00ean to\u00e0n b\u1ed9 t\u1eadp d\u1eef li\u1ec7u tr\u01b0\u1edbc khi chia th\u00e0nh t\u1eadp hu\u1ea5n luy\u1ec7n (train) v\u00e0 t\u1eadp ki\u1ec3m tra (test).<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Loi-nguyen-chieu-khong-gian-Curse-of-Dimensionality\"><\/span><strong>L\u1eddi nguy\u1ec1n chi\u1ec1u kh\u00f4ng gian (Curse of Dimensionality)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Vi\u1ec7c t\u1ea1o ra qu\u00e1 nhi\u1ec1u features m\u1edbi, \u0111\u1eb7c bi\u1ec7t th\u00f4ng qua c\u00e1c k\u1ef9 thu\u1eadt nh\u01b0 One-Hot Encoding tr\u00ean c\u00e1c bi\u1ebfn c\u00f3 nhi\u1ec1u gi\u00e1 tr\u1ecb duy nh\u1ea5t ho\u1eb7c t\u1ea1o Polynomial Features b\u1eadc cao, c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn hi\u1ec7n t\u01b0\u1ee3ng &#8220;l\u1eddi nguy\u1ec1n chi\u1ec1u kh\u00f4ng gian&#8221;.<\/p>\n<p>Khi s\u1ed1 l\u01b0\u1ee3ng features (chi\u1ec1u d\u1eef li\u1ec7u) t\u0103ng l\u00ean qu\u00e1 l\u1edbn so v\u1edbi s\u1ed1 l\u01b0\u1ee3ng m\u1eabu d\u1eef li\u1ec7u, kh\u00f4ng gian tr\u1edf n\u00ean c\u1ef1c k\u1ef3 th\u01b0a th\u1edbt. \u0110i\u1ec1u n\u00e0y l\u00e0m cho c\u00e1c thu\u1eadt to\u00e1n d\u1ef1a tr\u00ean kho\u1ea3ng c\u00e1ch (nh\u01b0 KNN) ho\u1ea1t \u0111\u1ed9ng k\u00e9m hi\u1ec7u qu\u1ea3, m\u00f4 h\u00ecnh d\u1ec5 b\u1ecb qu\u00e1 kh\u1edbp (overfitting) h\u01a1n.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cac-truong-hop-su-dung-Feature-Engineering\"><\/span><strong>C\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng Feature Engineering<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Feature Engineering l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt n\u1ec1n t\u1ea3ng v\u00e0 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng r\u1ed9ng r\u00e3i trong h\u1ea7u h\u1ebft c\u00e1c b\u00e0i to\u00e1n v\u00e0 l\u0129nh v\u1ef1c c\u1ee7a Machine Learning. N\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u1eed l\u00fd nhi\u1ec1u lo\u1ea1i d\u1eef li\u1ec7u kh\u00e1c nhau, t\u1eeb d\u1ea1ng b\u1ea3ng truy\u1ec1n th\u1ed1ng \u0111\u1ebfn v\u0103n b\u1ea3n, h\u00ecnh \u1ea3nh v\u00e0 chu\u1ed7i th\u1eddi gian.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Xu-ly-du-lieu-dang-bang-Tabular-Data\"><\/span><strong>X\u1eed l\u00fd d\u1eef li\u1ec7u d\u1ea1ng b\u1ea3ng (Tabular Data)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 l\u0129nh v\u1ef1c \u1ee9ng d\u1ee5ng ph\u1ed5 bi\u1ebfn v\u00e0 c\u01a1 b\u1ea3n nh\u1ea5t c\u1ee7a Feature Engineering. V\u1edbi d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c <strong>t\u1ed5 ch\u1ee9c d\u01b0\u1edbi d\u1ea1ng h\u00e0ng v\u00e0 c\u1ed9t trong b\u1ea3ng<\/strong>, k\u1ef9 thu\u1eadt n\u00e0y gi\u00fap x\u1eed l\u00fd gi\u00e1 tr\u1ecb thi\u1ebfu, m\u00e3 h\u00f3a c\u00e1c bi\u1ebfn ph\u00e2n lo\u1ea1i, v\u00e0 chu\u1ea9n h\u00f3a c\u00e1c bi\u1ebfn s\u1ed1 li\u00ean t\u1ee5c.<\/p>\n<p>V\u00ed d\u1ee5, trong b\u00e0i to\u00e1n d\u1ef1 \u0111o\u00e1n kh\u1ea3 n\u0103ng kh\u00e1ch h\u00e0ng r\u1eddi b\u1ecf d\u1ecbch v\u1ee5 (customer churn), ch\u00fang ta c\u00f3 th\u1ec3 t\u1ea1o c\u00e1c features m\u1edbi nh\u01b0 &#8216;th\u1eddi gian kh\u00e1ch h\u00e0ng \u0111\u00e3 s\u1eed d\u1ee5ng d\u1ecbch v\u1ee5&#8217;, &#8216;t\u1ef7 l\u1ec7 gi\u1eefa s\u1ed1 cu\u1ed9c g\u1ecdi ban ng\u00e0y v\u00e0 ban \u0111\u00eam&#8217;, ho\u1eb7c &#8216;s\u1ed1 ng\u00e0y k\u1ec3 t\u1eeb l\u1ea7n cu\u1ed1i c\u00f9ng li\u00ean h\u1ec7 h\u1ed7 tr\u1ee3&#8217;.<\/p>\n<p>C\u00e1c k\u1ef9 thu\u1eadt nh\u01b0 t\u1ea1o bi\u1ebfn t\u01b0\u01a1ng t\u00e1c (interaction features &#8211; v\u00ed d\u1ee5: nh\u00e2n gi\u00e1 tr\u1ecb hai c\u1ed9t v\u1edbi nhau) hay bi\u1ebfn \u0111a th\u1ee9c (polynomial features) c\u0169ng th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng tr\u00ean d\u1eef li\u1ec7u b\u1ea3ng \u0111\u1ec3 m\u00f4 h\u00ecnh n\u1eafm b\u1eaft \u0111\u01b0\u1ee3c c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p h\u01a1n gi\u1eefa c\u00e1c bi\u1ebfn.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Xu-ly-du-lieu-van-ban-Text-Data-trong-NLP\"><\/span><strong>X\u1eed l\u00fd d\u1eef li\u1ec7u v\u0103n b\u1ea3n (Text Data) trong NLP<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Trong l\u0129nh v\u1ef1c X\u1eed l\u00fd Ng\u00f4n ng\u1eef T\u1ef1 nhi\u00ean (NLP &#8211; Natural Language Processing), Feature Engineering \u0111\u00f3ng vai tr\u00f2 c\u1ed1t l\u00f5i \u0111\u1ec3 bi\u1ebfn \u0111\u1ed5i v\u0103n b\u1ea3n phi c\u1ea5u tr\u00fac th\u00e0nh d\u1ea1ng d\u1eef li\u1ec7u s\u1ed1 m\u00e0 c\u00e1c thu\u1eadt to\u00e1n Machine Learning c\u00f3 th\u1ec3 hi\u1ec3u v\u00e0 x\u1eed l\u00fd \u0111\u01b0\u1ee3c m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n<p>C\u00e1c k\u1ef9 thu\u1eadt ph\u1ed5 bi\u1ebfn bao g\u1ed3m Bag-of-Words (BoW) &#8211; \u0111\u1ebfm t\u1ea7n su\u1ea5t xu\u1ea5t hi\u1ec7n c\u1ee7a t\u1eeb, TF-IDF (Term Frequency-Inverse Document Frequency) &#8211; \u0111\u00e1nh gi\u00e1 t\u1ea7m quan tr\u1ecdng c\u1ee7a t\u1eeb trong m\u1ed9t t\u00e0i li\u1ec7u so v\u1edbi to\u00e0n b\u1ed9 kho v\u0103n b\u1ea3n, ho\u1eb7c t\u1ea1o N-grams \u0111\u1ec3 n\u1eafm b\u1eaft c\u00e1c c\u1ee5m t\u1eeb.<\/p>\n<p>Ngo\u00e0i ra, vi\u1ec7c t\u1ea1o c\u00e1c features nh\u01b0 &#8216;\u0111\u1ed9 d\u00e0i c\u1ee7a v\u0103n b\u1ea3n&#8217;, &#8216;s\u1ed1 l\u01b0\u1ee3ng c\u00e2u&#8217;, &#8216;t\u1ef7 l\u1ec7 t\u1eeb vi\u1ebft hoa&#8217;, hay s\u1eed d\u1ee5ng c\u00e1c k\u1ef9 thu\u1eadt nh\u00fang t\u1eeb (Word Embeddings) nh\u01b0 Word2Vec, GloVe \u0111\u1ec3 bi\u1ec3u di\u1ec5n ng\u1eef ngh\u0129a c\u1ee7a t\u1eeb c\u0169ng l\u00e0 nh\u1eefng \u1ee9ng d\u1ee5ng quan tr\u1ecdng c\u1ee7a Feature Engineering trong NLP.<\/p>\n<figure id=\"attachment_27100\" aria-describedby=\"caption-attachment-27100\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Mot-so-thach-thuc-cua-Feature-Engineering-1.png\" alt=\"M\u1ed9t s\u1ed1 th\u00e1ch th\u1ee9c c\u1ee7a Feature Engineering\" width=\"800\" height=\"500\" class=\"size-full wp-image-27100\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Mot-so-thach-thuc-cua-Feature-Engineering-1.png 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Mot-so-thach-thuc-cua-Feature-Engineering-1-300x188.png 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Mot-so-thach-thuc-cua-Feature-Engineering-1-768x480.png 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/04\/Mot-so-thach-thuc-cua-Feature-Engineering-1-750x469.png 750w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-27100\" class=\"wp-caption-text\">M\u1ed9t s\u1ed1 th\u00e1ch th\u1ee9c c\u1ee7a Feature Engineering<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Xu-ly-du-lieu-hinh-anh-Image-Data-trong-Computer-Vision\"><\/span><strong>X\u1eed l\u00fd d\u1eef li\u1ec7u h\u00ecnh \u1ea3nh (Image Data) trong Computer Vision<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Tr\u01b0\u1edbc khi c\u00e1c m\u00f4 h\u00ecnh Deep Learning ph\u00e1t tri\u1ec3n m\u1ea1nh m\u1ebd, Feature Engineering th\u1ee7 c\u00f4ng l\u00e0 b\u01b0\u1edbc c\u1ef1c k\u1ef3 quan tr\u1ecdng trong l\u0129nh v\u1ef1c Th\u1ecb gi\u00e1c M\u00e1y t\u00ednh (Computer Vision). N\u00f3 t\u1eadp trung v\u00e0o vi\u1ec7c <strong>tr\u00edch xu\u1ea5t c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m h\u00ecnh \u1ea3nh<\/strong> <strong>c\u00f3 \u00fd ngh\u0129a<\/strong> nh\u01b0 c\u1ea1nh, g\u00f3c, \u0111i\u1ec3m \u0111\u1eb7c bi\u1ec7t, m\u00e0u s\u1eafc, k\u1ebft c\u1ea5u (texture).<\/p>\n<p>C\u00e1c thu\u1eadt to\u00e1n kinh \u0111i\u1ec3n nh\u01b0 SIFT (Scale-Invariant Feature Transform), SURF (Speeded Up Robust Features), hay HOG (Histogram of Oriented Gradients) \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 t\u1ea1o ra c\u00e1c vector \u0111\u1eb7c tr\u01b0ng (feature vectors) m\u00f4 t\u1ea3 n\u1ed9i dung c\u1ee7a h\u00ecnh \u1ea3nh, ph\u1ee5c v\u1ee5 cho c\u00e1c t\u00e1c v\u1ee5 nh\u01b0 nh\u1eadn d\u1ea1ng v\u1eadt th\u1ec3, ph\u00e2n lo\u1ea1i \u1ea3nh.<\/p>\n<p>M\u1eb7c d\u00f9 c\u00e1c m\u1ea1ng n\u01a1-ron t\u00edch ch\u1eadp (CNN &#8211; Convolutional Neural Networks) hi\u1ec7n nay c\u00f3 kh\u1ea3 n\u0103ng t\u1ef1 \u0111\u1ed9ng h\u1ecdc c\u00e1c \u0111\u1eb7c tr\u01b0ng (Feature Learning) hi\u1ec7u qu\u1ea3, vi\u1ec7c hi\u1ec3u c\u00e1c nguy\u00ean t\u1eafc Feature Engineering truy\u1ec1n th\u1ed1ng v\u1eabn r\u1ea5t h\u1eefu \u00edch \u0111\u1ec3 ph\u00e2n t\u00edch, g\u1ee1 l\u1ed7i v\u00e0 c\u1ea3i thi\u1ec7n m\u00f4 h\u00ecnh Deep Learning.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Xu-ly-du-lieu-chuoi-thoi-gian-Time-Series-Data\"><\/span><strong>X\u1eed l\u00fd d\u1eef li\u1ec7u chu\u1ed7i th\u1eddi gian (Time Series Data)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u1ed1i v\u1edbi d\u1eef li\u1ec7u c\u00f3 y\u1ebfu t\u1ed1 th\u1eddi gian (v\u00ed d\u1ee5: gi\u00e1 c\u1ed5 phi\u1ebfu, d\u1eef li\u1ec7u c\u1ea3m bi\u1ebfn, d\u1ef1 b\u00e1o th\u1eddi ti\u1ebft), Feature Engineering gi\u00fap t\u1ea1o ra c\u00e1c \u0111\u1eb7c tr\u01b0ng n\u1eafm b\u1eaft \u0111\u01b0\u1ee3c t\u00ednh xu h\u01b0\u1edbng (trend), t\u00ednh m\u00f9a v\u1ee5 (seasonality), v\u00e0 s\u1ef1 ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c gi\u00e1 tr\u1ecb trong qu\u00e1 kh\u1ee9 (lagged features).<\/p>\n<p>C\u00e1c k\u1ef9 thu\u1eadt th\u01b0\u1eddng d\u00f9ng bao g\u1ed3m t\u00ednh to\u00e1n c\u00e1c gi\u00e1 tr\u1ecb th\u1ed1ng k\u00ea tr\u01b0\u1ee3t (v\u00ed d\u1ee5: trung b\u00ecnh tr\u01b0\u1ee3t &#8211; moving average, \u0111\u1ed9 l\u1ec7ch chu\u1ea9n tr\u01b0\u1ee3t), t\u1ea1o c\u00e1c bi\u1ebfn \u0111\u1ed9 tr\u1ec5 (v\u00ed d\u1ee5: gi\u00e1 tr\u1ecb c\u1ee7a ng\u00e0y h\u00f4m qua, tu\u1ea7n tr\u01b0\u1edbc), ho\u1eb7c ph\u00e2n r\u00e3 th\u00e0nh ph\u1ea7n th\u1eddi gian (n\u0103m, qu\u00fd, th\u00e1ng, th\u1ee9 trong tu\u1ea7n).<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Cac-ung-dung-khac\"><\/span><strong>C\u00e1c \u1ee9ng d\u1ee5ng kh\u00e1c<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ngo\u00e0i c\u00e1c l\u0129nh v\u1ef1c tr\u00ean, k\u1ef9 thu\u1eadt Feature Engineering c\u00f2n \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u b\u00e0i to\u00e1n kh\u00e1c nh\u01b0: h\u1ec7 th\u1ed1ng g\u1ee3i \u00fd (t\u1ea1o \u0111\u1eb7c tr\u01b0ng ng\u01b0\u1eddi d\u00f9ng, \u0111\u1eb7c tr\u01b0ng s\u1ea3n ph\u1ea9m), ph\u00e1t hi\u1ec7n gian l\u1eadn (t\u1ea1o \u0111\u1eb7c tr\u01b0ng h\u00e0nh vi b\u1ea5t th\u01b0\u1eddng), ph\u00e2n t\u00edch d\u1eef li\u1ec7u kh\u00f4ng gian \u0111\u1ecba l\u00fd (t\u1ea1o \u0111\u1eb7c tr\u01b0ng kho\u1ea3ng c\u00e1ch, v\u00f9ng l\u00e2n c\u1eadn).<\/p>\n<p>T\u00f3m l\u1ea1i, b\u1ea5t c\u1ee9 n\u01a1i n\u00e0o c\u00f3 d\u1eef li\u1ec7u v\u00e0 mong mu\u1ed1n x\u00e2y d\u1ef1ng m\u00f4 h\u00ecnh Machine Learning hi\u1ec7u qu\u1ea3, Feature Engineering \u0111\u1ec1u \u0111\u00f3ng m\u1ed9t vai tr\u00f2 kh\u00f4ng th\u1ec3 thi\u1ebfu. N\u00f3 gi\u00fap khai ph\u00e1 t\u1ed1i \u0111a gi\u00e1 tr\u1ecb t\u1eeb d\u1eef li\u1ec7u th\u00f4, t\u1ea1o n\u1ec1n t\u1ea3ng v\u1eefng ch\u1eafc cho c\u00e1c b\u01b0\u1edbc m\u00f4 h\u00ecnh h\u00f3a ti\u1ebfp theo.<\/p>\n<p>Khi tri\u1ec3n khai c\u00e1c m\u00f4 h\u00ecnh Machine Learning, vi\u1ec7c ch\u1ecdn m\u1ed9t m\u00f4i tr\u01b0\u1eddng \u1ed5n \u0111\u1ecbnh v\u00e0 hi\u1ec7u qu\u1ea3 l\u00e0 r\u1ea5t quan tr\u1ecdng. D\u1ecbch v\u1ee5 <a href=\"https:\/\/interdata.vn\/thue-vps\/\">thu\u00ea VPS ch\u1ea5t l\u01b0\u1ee3ng gi\u00e1 r\u1ebb<\/a> t\u1ea1i InterData s\u1eed d\u1ee5ng ph\u1ea7n c\u1ee9ng th\u1ebf h\u1ec7 m\u1edbi v\u1edbi CPU AMD EPYC ho\u1eb7c Intel Xeon Platinum, SSD NVMe U.2 v\u00e0 b\u0103ng th\u00f4ng cao, gi\u00fap b\u1ea1n ch\u1ea1y c\u00e1c t\u00e1c v\u1ee5 t\u00ednh to\u00e1n m\u00e0 kh\u00f4ng g\u1eb7p ph\u1ea3i s\u1ef1 c\u1ed1 v\u1ec1 hi\u1ec7u su\u1ea5t.<\/p>\n<p>N\u1ebfu b\u1ea1n c\u1ea7n m\u1ed9t h\u1ec7 th\u1ed1ng m\u1ea1nh m\u1ebd v\u00e0 linh ho\u1ea1t h\u01a1n, d\u1ecbch v\u1ee5 <a href=\"https:\/\/interdata.vn\/cloud-server\/\">thu\u00ea Cloud Server gi\u00e1 r\u1ebb t\u1ed1c \u0111\u1ed9 cao<\/a> c\u1ee7a InterData s\u1ebd l\u00e0 l\u1ef1a ch\u1ecdn l\u00fd t\u01b0\u1edfng. V\u1edbi c\u1ea5u h\u00ecnh t\u1ed1i \u01b0u, dung l\u01b0\u1ee3ng linh ho\u1ea1t v\u00e0 t\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd v\u01b0\u1ee3t tr\u1ed9i, d\u1ecbch v\u1ee5 n\u00e0y s\u1ebd gi\u00fap b\u1ea1n tri\u1ec3n khai c\u00e1c m\u00f4 h\u00ecnh h\u1ecdc m\u00e1y, ph\u00e2n t\u00edch d\u1eef li\u1ec7u ho\u1eb7c l\u01b0u tr\u1eef v\u1edbi hi\u1ec7u su\u1ea5t \u1ed5n \u0111\u1ecbnh v\u00e0 chi ph\u00ed h\u1ee3p l\u00fd.<\/p>\n<p><strong>INTERDATA<\/strong><\/p>\n<ul>\n<li><strong>Website:<\/strong><span>\u00a0<\/span>Interdata.vn<\/li>\n<li><strong>Hotline:<\/strong><span>\u00a0<\/span>1900-636822<\/li>\n<li><strong>Email:<\/strong><span>\u00a0<\/span>Info@interdata.vn<\/li>\n<li><strong>VP\u0110D:<\/strong><span>\u00a0<\/span>240 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><span>\u00a0<\/span>S\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","protected":false},"excerpt":{"rendered":"<p>Feature Engineering l\u00e0 m\u1ed9t trong nh\u1eefng b\u01b0\u1edbc quan tr\u1ecdng nh\u1ea5t trong qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n m\u00f4 h\u00ecnh Machine Learning (H\u1ecdc m\u00e1y). N\u00f3 gi\u00fap chuy\u1ec3n \u0111\u1ed5i d\u1eef li\u1ec7u th\u00f4 th\u00e0nh c\u00e1c \u0111\u1eb7c tr\u01b0ng (features) c\u00f3 gi\u00e1 tr\u1ecb, t\u1eeb \u0111\u00f3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a m\u00f4 h\u00ecnh. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd gi\u00fap b\u1ea1n<\/p>\n","protected":false},"author":11,"featured_media":27101,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108],"tags":[],"class_list":["post-27089","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\/27089","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=27089"}],"version-history":[{"count":6,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/27089\/revisions"}],"predecessor-version":[{"id":27592,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/27089\/revisions\/27592"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media\/27101"}],"wp:attachment":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media?parent=27089"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/categories?post=27089"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/tags?post=27089"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}