{"id":1840,"date":"2022-05-10T04:37:59","date_gmt":"2022-05-10T04:37:59","guid":{"rendered":"https:\/\/topviecit.vn\/blog\/?p=1840"},"modified":"2023-03-14T07:28:10","modified_gmt":"2023-03-14T07:28:10","slug":"cost-function-la-gi","status":"publish","type":"post","link":"https:\/\/topviecit.vn\/blog\/cost-function-la-gi\/","title":{"rendered":"Cost Function l\u00e0 g\u00ec? Ki\u1ebfn th\u1ee9c cho ng\u01b0\u1eddi m\u1edbi v\u00e0o ngh\u1ec1"},"content":{"rendered":"\n<p>B\u00ean c\u1ea1nh c\u00e1c m\u1eabu d\u1eef li\u1ec7u, c\u00e1c h\u00e0m t\u00ednh t\u00ednh to\u00e1n ch\u00ednh l\u00e0 c\u00f4ng c\u1ee5 \u0111\u1eafc l\u1ef1c gi\u00fap Machine Learning d\u1ef1 \u0111o\u00e1n ch\u00ednh x\u00e1c. Trong \u0111\u00f3, m\u1ed9t h\u00e0m t\u00ednh to\u00e1n c\u01a1 b\u1ea3n ng\u01b0\u1eddi m\u1edbi v\u00e0o ngh\u1ec1 nh\u1ea5t \u0111\u1ecbnh ph\u1ea3i bi\u1ebft ch\u00ednh l\u00e0 Cost Function. V\u1eady <strong><a href=\"https:\/\/topviecit.vn\/blog\/cost-function-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">Cost Function l\u00e0 g\u00ec<\/a><\/strong>? Khi n\u00e0o c\u1ea7n s\u1eed d\u1ee5ng Cost Function? C\u00e2u tr\u1ea3 l\u1eddi s\u1ebd c\u00f3 ngay trong b\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y c\u1ee7a <strong><a href=\"https:\/\/topviecit.vn\/\" target=\"_blank\" rel=\"noreferrer noopener\">topviecit.vn<\/a><\/strong><\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_63 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/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 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/topviecit.vn\/blog\/cost-function-la-gi\/#Cost_Function_la_gi\" title=\"Cost Function l\u00e0 g\u00ec?&nbsp;\">Cost Function l\u00e0 g\u00ec?&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/topviecit.vn\/blog\/cost-function-la-gi\/#Khi_nao_can_su_dung_ham_Cost_Function\" title=\"Khi n\u00e0o c\u1ea7n s\u1eed d\u1ee5ng h\u00e0m Cost Function?\">Khi n\u00e0o c\u1ea7n s\u1eed d\u1ee5ng h\u00e0m Cost Function?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/topviecit.vn\/blog\/cost-function-la-gi\/#Phan_loai_cac_ham_Cost_Function\" title=\"Ph\u00e2n lo\u1ea1i c\u00e1c h\u00e0m Cost Function\">Ph\u00e2n lo\u1ea1i c\u00e1c h\u00e0m Cost Function<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/topviecit.vn\/blog\/cost-function-la-gi\/#Ham_Cost_Function_quy_hoi\" title=\"H\u00e0m Cost Function quy h\u1ed3i&nbsp;\">H\u00e0m Cost Function quy h\u1ed3i&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/topviecit.vn\/blog\/cost-function-la-gi\/#Ham_Cost_Function_phan_loai_nhi_phan\" title=\"H\u00e0m Cost Function ph\u00e2n lo\u1ea1i nh\u1ecb ph\u00e2n&nbsp;\">H\u00e0m Cost Function ph\u00e2n lo\u1ea1i nh\u1ecb ph\u00e2n&nbsp;<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cost_Function_la_gi\"><\/span><strong>Cost Function l\u00e0 g\u00ec?&nbsp;<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u0110\u1ecbnh ngh\u0129a Cost Function l\u00e0 g\u00ec kh\u00e1 ph\u1ee9c t\u1ea1p. Tuy nhi\u00ean, d\u1ef1a v\u00e0o ch\u1ee9c n\u0103ng c\u1ee7a n\u00f3 khi k\u1ebft h\u1ee3p v\u1edbi c\u00e1c h\u00e0m kh\u00e1c, b\u1ea1n s\u1ebd c\u00f3 c\u00e1i nh\u00ecn d\u1ec5 hi\u1ec3u h\u01a1n v\u1ec1 h\u00e0m n\u00e0y.&nbsp;<\/p>\n\n\n\n<p>Cost Function v\u00e0 Hypothesis Function l\u00e0 m\u1ed9t c\u1eb7p b\u00e0i tr\u00f9ng lu\u00f4n song h\u00e0nh c\u00f9ng nhau. N\u1ebfu Hypothesis Function hay c\u00f2n g\u1ecdi l\u00e0 H\u00e0m gi\u1ea3 \u0111\u1ecbnh (H\u00e0m d\u1ef1 \u0111o\u00e1n) gi\u00fap nh\u1eefng ch\u01b0\u01a1ng tr\u00ecnh Machine Learning d\u1ef1 \u0111o\u00e1n v\u00e0 t\u00ecm c\u00e1c tr\u1ecdng s\u1ed1 t\u1ed1i \u01b0u. Th\u00ec Cost Function s\u1ebd h\u1ed7 tr\u1ee3 l\u00e0m t\u0103ng t\u00ednh ch\u00ednh x\u00e1c c\u1ee7a nh\u1eefng d\u1ef1 \u0111o\u00e1n n\u00e0y.&nbsp;<\/p>\n\n\n\n<p>>>>Xem th\u00eam: <strong><a href=\"https:\/\/topviecit.vn\/blog\/function-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">Function L\u00e0 G\u00ec? B\u00ed M\u1eadt V\u1ec1 Function M\u00e0 D\u00e2n L\u1eadp Tr\u00ecnh C\u1ea7n Bi\u1ebft<\/a><\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1232\" height=\"800\" src=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-8-1232x800.png\" alt=\"H\u00e0m Cost Function c\u00f3 t\u00ednh \u1ee9ng d\u1ee5ng trong h\u1ea7u h\u1ebft l\u0129nh v\u1ef1c c\u1ee7a Machine Learning\" class=\"wp-image-1862\" title=\"H\u00e0m Cost Function c\u00f3 t\u00ednh \u1ee9ng d\u1ee5ng trong h\u1ea7u h\u1ebft l\u0129nh v\u1ef1c c\u1ee7a Machine Learning\" srcset=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-8-1232x800.png 1232w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-8-616x400.png 616w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-8-768x499.png 768w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-8-1536x997.png 1536w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-8.png 1600w\" sizes=\"auto, (max-width: 1232px) 100vw, 1232px\" \/><figcaption class=\"wp-element-caption\"><em>H\u00e0m Cost Function c\u00f3 t\u00ednh \u1ee9ng d\u1ee5ng trong h\u1ea7u h\u1ebft l\u0129nh v\u1ef1c c\u1ee7a Machine Learning<\/em><\/figcaption><\/figure><\/div>\n\n\n<p>C\u1ee5 th\u1ec3, Cost Function v\u1eeba \u0111\u01b0a ra d\u1ef1 \u0111o\u00e1n \u0111\u1ea7u ra th\u1ef1c t\u1ebf c\u1ee7a m\u00f4 h\u00ecnh v\u1eeba t\u00ednh to\u00e1n m\u1ee9c \u0111\u1ed9 sai l\u1ea7m c\u1ee7a m\u00f4 h\u00ecnh trong d\u1ef1 \u0111o\u00e1n c\u1ee7a n\u00f3. N\u1ebfu d\u1ef1 \u0111o\u00e1n c\u1ee7a ch\u00fang ta sai bi\u1ec7t nhi\u1ec1u so v\u1edbi gi\u00e1 tr\u1ecb th\u1ef1c t\u1ebf, Cost Function s\u1ebd cho ra con s\u1ed1 cao h\u01a1n.&nbsp;<\/p>\n\n\n\n<p>B\u00ean c\u1ea1nh \u0111\u00f3, h\u00e0m Cost Function c\u0169ng h\u1ed7 tr\u1ee3 kh\u00e1 nhi\u1ec1u cho Loss Function (H\u00e0m m\u1ea5t m\u00e1t). Theo \u0111\u00f3, Cost Function \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ch\u1ec9 m\u1ee9c trung b\u00ecnh c\u1ee7a c\u00e1c h\u00e0m Los Function tr\u00ean to\u00e0n b\u1ed9 t\u1eadp d\u1eef li\u1ec7u \u0111\u00e0o t\u1ea1o.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Khi_nao_can_su_dung_ham_Cost_Function\"><\/span><strong>Khi n\u00e0o c\u1ea7n s\u1eed d\u1ee5ng h\u00e0m Cost Function?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Sau khi \u0111\u00e3 \u0111i t\u00ecm hi\u1ec3u \u201cCost Function l\u00e0 g\u00ec?\u201d ch\u00fang ta c\u1ea7n hi\u1ec3u \u0111\u01b0\u1ee3c vai tr\u00f2 c\u1ee7a n\u00f3 trong nh\u1eefng ch\u01b0\u01a1ng tr\u00ecnh Machine Learning. \u0110\u1ec3 t\u00ecm c\u00e2u tr\u1ea3 l\u1eddi cho c\u00e2u h\u1ecfi \u1edf tr\u00ean, h\u00e3y \u0111\u1eb7t Cost Function v\u00e0o m\u1ed9t v\u00ed d\u1ee5 th\u1ef1c t\u1ebf khi ph\u00e2n lo\u1ea1i d\u1eef li\u1ec7u. Gi\u1ea3 s\u1eed ch\u00fang ta c\u00f3 th\u00f4ng tin chi ti\u1ebft v\u1ec1 chi\u1ec1u cao v\u00e0 c\u00e2n n\u1eb7ng c\u1ee7a m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng m\u00e8o v\u00e0 ch\u00f3. Ch\u00fang ta h\u00e3y s\u1eed d\u1ee5ng 2 \u0111\u1eb7c \u0111i\u1ec3m n\u00e0y \u0111\u1ec3 ph\u00e2n lo\u1ea1i ch\u00fang m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c. N\u1ebfu v\u1ebd bi\u1ec3u \u0111\u1ed3, ch\u00fang ta s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c bi\u1ec3u \u0111\u1ed3 ph\u00e2n t\u00e1n sau:<\/p>\n\n\n\n<p>V\u1ec1 c\u01a1 b\u1ea3n c\u1ea3 ba b\u1ed9 ph\u00e2n lo\u1ea1i \u0111\u1ec1u c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c r\u1ea5t cao nh\u01b0ng gi\u1ea3i ph\u00e1p th\u1ee9 ba l\u00e0 t\u1ed1t nh\u1ea5t v\u00ec n\u00f3 kh\u00f4ng ph\u00e2n lo\u1ea1i sai b\u1ea5t k\u1ef3 \u0111i\u1ec3m n\u00e0o. L\u00fd do t\u1ea1i sao n\u00f3 ph\u00e2n lo\u1ea1i t\u1ea5t c\u1ea3 c\u00e1c \u0111i\u1ec3m m\u1ed9t c\u00e1ch ho\u00e0n h\u1ea3o l\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng g\u1ea7n nh\u01b0 ch\u00ednh x\u00e1c gi\u1eefa hai nh\u00f3m v\u00e0 kh\u00f4ng g\u1ea7n h\u01a1n b\u1ea5t k\u1ef3 \u0111i\u1ec3m n\u00e0o trong s\u1ed1 c\u00e1c nh\u00f3m. \u0110\u00e2y l\u00e0 n\u01a1i xu\u1ea5t hi\u1ec7n kh\u00e1i ni\u1ec7m ham Cost Function. H\u00e0m Cost Function gi\u00fap ch\u00fang ta \u0111\u1ea1t \u0111\u01b0\u1ee3c gi\u1ea3i ph\u00e1p t\u1ed1i \u01b0u v\u00e0 l\u00e0 k\u1ef9 thu\u1eadt \u0111\u00e1nh gi\u00e1 hi\u1ec7u qu\u1ea3 c\u1ee7a c\u00e1c thu\u1eadt to\u00e1n\/ m\u00f4 h\u00ecnh.&nbsp;<\/p>\n\n\n\n<p>Theo \u0111\u00f3, ch\u00fang ta c\u00f3 th\u1ec3 d\u1ef1a tr\u00ean Cost Function \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh m\u00f4 h\u00ecnh c\u1ee7a m\u00ecnh nh\u1eb1m c\u1ea3i thi\u1ec7n c\u00e1c d\u1ef1 \u0111o\u00e1n. H\u00e0m Cost Function ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t ch\u1ec9 b\u00e1o cho bi\u1ebft m\u00f4 h\u00ecnh \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n nh\u01b0 th\u1ebf n\u00e0o. T\u1eeb \u0111\u00f3 t\u0103ng kh\u1ea3 n\u0103ng t\u1ed1i \u01b0u h\u00f3a.&nbsp;<\/p>\n\n\n\n<p>>>>Xem th\u00eam: <strong><a href=\"https:\/\/topviecit.vn\/blog\/deep-learning-va-machine-learning\/\" target=\"_blank\" rel=\"noreferrer noopener\">S\u1ef1 Kh\u00e1c Bi\u1ec7t Gi\u1eefa Deep Learning V\u00e0 Machine Learning L\u00e0 G\u00ec?<\/a><\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-18.jpeg\" alt=\"H\u00ecnh \u1ea3nh v\u00ed d\u1ee5 ph\u00e2n lo\u1ea1i khi s\u1eed d\u1ee5ng h\u00e0m Cost Function \" class=\"wp-image-1863\" title=\"H\u00ecnh \u1ea3nh v\u00ed d\u1ee5 ph\u00e2n lo\u1ea1i khi s\u1eed d\u1ee5ng h\u00e0m Cost Function \" srcset=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-18.jpeg 800w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-18-640x400.jpeg 640w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-18-768x480.jpeg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\"><em><em>H\u00ecnh \u1ea3nh v\u00ed d\u1ee5 ph\u00e2n lo\u1ea1i khi s\u1eed d\u1ee5ng h\u00e0m Cost Function&nbsp;<\/em><\/em><\/figcaption><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Phan_loai_cac_ham_Cost_Function\"><\/span><strong>Ph\u00e2n lo\u1ea1i c\u00e1c h\u00e0m Cost Function<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Tr\u00ean th\u1ef1c t\u1ebf, c\u00f3 nhi\u1ec1u lo\u1ea1i h\u00e0m Cost Function trong c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh Machine Learning. N\u1ebfu \u0111\u00e3 hi\u1ec3u \u0111\u01b0\u1ee3c Cost Function l\u00e0 g\u00ec th\u00ec vi\u1ec7c ph\u00e2n lo\u1ea1i ch\u00fang s\u1ebd \u0111\u01a1n gi\u1ea3n h\u01a1n. V\u00ec m\u1ed7i lo\u1ea1i s\u1ebd \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o b\u00e0i to\u00e1n h\u1ed3i quy hay b\u00e0i to\u00e1n ph\u00e2n lo\u1ea1i.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ham_Cost_Function_quy_hoi\"><\/span><strong>H\u00e0m Cost Function quy h\u1ed3i&nbsp;<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>M\u00f4 h\u00ecnh h\u1ed3i quy x\u1eed l\u00fd vi\u1ec7c d\u1ef1 \u0111o\u00e1n m\u1ed9t gi\u00e1 tr\u1ecb li\u00ean t\u1ee5c, v\u00ed d\u1ee5 nh\u01b0 l\u01b0\u01a1ng nh\u00e2n vi\u00ean, gi\u00e1 xe, d\u1ef1 \u0111o\u00e1n kho\u1ea3n vay, v.v. M\u1ed9t h\u00e0m Cost Function \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong b\u00e0i to\u00e1n h\u1ed3i quy \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u201cH\u00e0m Cost Function h\u1ed3i quy\u201d. Ch\u00fang \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n tr\u00ean sai s\u1ed1 d\u1ef1a tr\u00ean c\u00f4ng th\u1ee9c nh\u01b0 sau:<\/p>\n\n\n\n<p><em>Error = y-y &#8216;<\/em><\/p>\n\n\n\n<p><em>V\u1edbi:&nbsp;<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><em>Y &#8211; \u0110\u1ea7u v\u00e0o th\u1ef1c t\u1ebf<\/em><\/li>\n\n\n\n<li><em>Y \u2019- S\u1ea3n l\u01b0\u1ee3ng d\u1ef1 \u0111o\u00e1n<\/em><\/li>\n<\/ul>\n\n\n\n<p><em>M\u1ed9t s\u1ed1 h\u00e0m Cost Function \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nhi\u1ec1u nh\u1ea5t c\u00f3 th\u1ec3 k\u1ec3 \u0111\u1ebfn nh\u01b0:&nbsp;<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><em>Mean Error (ME)<\/em><\/li>\n\n\n\n<li><em>Mean Squared Error (MSE)<\/em><\/li>\n\n\n\n<li><em>Mean Absolute Error (MAE)<\/em><\/li>\n<\/ul>\n\n\n\n<p>Xem th\u00eam: <strong><a href=\"https:\/\/topviecit.vn\/blog\/loss-function-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">Loss Function L\u00e0 G\u00ec? T\u00ecm Hi\u1ec3u Chi Ti\u1ebft V\u1ec1 Loss Function<\/a><\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"894\" height=\"611\" src=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-9.png\" alt=\"M\u1ed9t s\u1ed1 b\u00e0i to\u00e1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng Cost Function \" class=\"wp-image-1864\" title=\"M\u1ed9t s\u1ed1 b\u00e0i to\u00e1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng Cost Function \" srcset=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-9.png 894w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-9-585x400.png 585w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-9-768x525.png 768w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-9-305x207.png 305w\" sizes=\"auto, (max-width: 894px) 100vw, 894px\" \/><figcaption class=\"wp-element-caption\"><em><em>M\u1ed9t s\u1ed1 b\u00e0i to\u00e1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng Cost Function&nbsp;<\/em><\/em><\/figcaption><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ham_Cost_Function_phan_loai_nhi_phan\"><\/span><strong>H\u00e0m Cost Function ph\u00e2n lo\u1ea1i nh\u1ecb ph\u00e2n&nbsp;<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>H\u00e0m Cost Function \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c b\u00e0i to\u00e1n ph\u00e2n lo\u1ea1i s\u1ebd kh\u00e1c v\u1edbi b\u00e0i to\u00e1n quy h\u1ed3i. M\u1ed9t trong nh\u1eefng h\u00e0m Loss Function ( H\u00e0m m\u1ea5t m\u00e1t) \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ph\u00e2n lo\u1ea1i l\u00e0 cross &#8211; entropy loss function ( H\u00e0m m\u1ea5t m\u00e1t ch\u00e9o). Tr\u01b0\u1edbc khi t\u00ecm hi\u1ec3u v\u1ec1 cost function ph\u00e2n lo\u1ea1i nh\u1ecb ph\u00e2n, ch\u00fang ta c\u1ea7n hi\u1ec3u ki\u1ebfn th\u1ee9c n\u1ec1n t\u1ea3ng v\u1ec1 cross &#8211; entropy loss function.&nbsp;<\/p>\n\n\n\n<p>M\u1ed9t v\u00ed d\u1ee5 th\u1ef1c t\u1ebf nh\u01b0 sau:&nbsp;<\/p>\n\n\n\n<p>L\u1edbp (Cam, T\u00e1o, C\u00e0 chua)<\/p>\n\n\n\n<p>M\u00f4 h\u00ecnh Machine Learning s\u1ebd \u0111\u01b0a ra ph\u00e2n ph\u1ed1i x\u00e1c su\u1ea5t c\u1ee7a 3 l\u1edbp n\u00e0y l\u00e0m \u0111\u1ea7u ra cho m\u1ed9t d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o nh\u1ea5t \u0111\u1ecbnh. L\u1edbp c\u00f3 x\u00e1c su\u1ea5t cao nh\u1ea5t \u0111\u01b0\u1ee3c coi l\u00e0 l\u1edbp chi\u1ebfn th\u1eafng \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n.<\/p>\n\n\n\n<p><em>Output = [P (Cam), P (T\u00e1o), P (C\u00e0 chua)]<\/em><\/p>\n\n\n\n<p><em>Ph\u00e2n ph\u1ed1i x\u00e1c su\u1ea5t th\u1ef1c t\u1ebf cho m\u1ed7i l\u1edbp \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb b\u00ean d\u01b0\u1edbi.<\/em><\/p>\n\n\n\n<p><em>Cam = [1,0,0]<\/em><\/p>\n\n\n\n<p><em>T\u00e1o = [0,1,0]<\/em><\/p>\n\n\n\n<p><em>C\u00e0 chua = [0,0,1]<\/em><\/p>\n\n\n\n<p>>>> Xem th\u00eam: <strong><a href=\"https:\/\/topviecit.vn\/blog\/arrow-function-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">Arrow Function L\u00e0 G\u00ec? Ph\u00e2n Bi\u1ec7t Arrow Function V\u00e0 Function<\/a><\/strong>\u00a0<\/p>\n\n\n\n<p>N\u1ebfu trong giai \u0111o\u1ea1n Training, l\u1edbp \u0111\u1ea7u v\u00e0o l\u00e0 c\u00e0 chua, th\u00ec ph\u00e2n ph\u1ed1i x\u00e1c su\u1ea5t d\u1ef1 \u0111o\u00e1n s\u1ebd c\u00f3 xu h\u01b0\u1edbng h\u01b0\u1edbng t\u1edbi ph\u00e2n ph\u1ed1i x\u00e1c su\u1ea5t th\u1ef1c t\u1ebf c\u1ee7a l\u1edbp n\u00e0y. N\u1ebfu ph\u00e2n ph\u1ed1i x\u00e1c su\u1ea5t d\u1ef1 \u0111o\u00e1n kh\u00f4ng g\u1ea7n v\u1edbi th\u1ef1c t\u1ebf h\u01a1n, th\u00ec m\u00f4 h\u00ecnh ph\u1ea3i \u0111i\u1ec1u ch\u1ec9nh tr\u1ecdng s\u1ed1 c\u1ee7a n\u00f3. \u0110\u00e2y l\u00e0 n\u01a1i m\u00e0 cross &#8211; entropy tr\u1edf th\u00e0nh m\u1ed9t c\u00f4ng c\u1ee5 \u0111\u1ec3 t\u00ednh to\u00e1n ph\u00e2n ph\u1ed1i x\u00e1c su\u1ea5t d\u1ef1 \u0111o\u00e1n so v\u1edbi th\u1ef1c t\u1ebf l\u00e0 bao nhi\u00eau. N\u00f3i c\u00e1ch kh\u00e1c, c\u00f3 th\u1ec3 coi Cross-entropy l\u00e0 m\u1ed9t c\u00e1ch \u0111\u1ec3 \u0111o kho\u1ea3ng c\u00e1ch gi\u1eefa hai ph\u00e2n ph\u1ed1i x\u00e1c su\u1ea5t.<\/p>\n\n\n\n<p>Tr\u00ean \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 <strong>Cost Function l\u00e0 g\u00ec<\/strong> c\u0169ng nh\u01b0 nh\u1eefng v\u00ed d\u1ee5 minh ho\u1ea1t tr\u1ef1c quan v\u1ec1 c\u00e1ch s\u1eed d\u1ee5ng h\u00e0m n\u00e0y. C\u00f4ng ngh\u1ec7 Machine Learning c\u00f2n kh\u00e1 m\u1edbi m\u1ebb n\u00ean vi\u1ec7c n\u1eafm v\u1eefng c\u00e1c ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n nh\u01b0 tr\u00ean ch\u1eafc ch\u1eafn s\u1ebd gi\u00fap b\u1ea1n r\u1ea5t nhi\u1ec1u khi theo \u0111u\u1ed5i l\u0129nh v\u1ef1c n\u00e0y. Hy v\u1ecdng b\u00e0i vi\u1ebft tr\u00ean \u0111\u00e3 mang \u0111\u1ebfn cho b\u1ea1n nhi\u1ec1u th\u00f4ng tin h\u1eefu \u00edch. V\u00e0 \u0111\u1eebng qu\u00ean truy c\u1eadp ngay v\u00e0o\u00a0<strong><a href=\"https:\/\/www.topcv.vn\/\" target=\"_blank\" rel=\"noreferrer noopener\">TopCV<\/a><\/strong>\u00a0\u0111\u1ec3 c\u1eadp nh\u1eadt\u00a0<strong><a href=\"https:\/\/www.topcv.vn\/viec-lam-it\" target=\"_blank\" rel=\"noreferrer noopener\">vi\u1ec7c l\u00e0m IT<\/a><\/strong>\u00a0li\u00ean quan \u0111\u1ebfn Cost function m\u1ed7i ng\u00e0y!<\/p>\n\n\n\n<p><strong>C\u00f3 th\u1ec3 b\u1ea1n quan t\u00e2m: <a href=\"https:\/\/topviecit.vn\/blog\/hoc-it-co-kho-khong\/\" target=\"_blank\" rel=\"noreferrer noopener\">H\u1ecdc IT C\u00f3 Kh\u00f3 Kh\u00f4ng? C\u01a1 H\u1ed9i Vi\u1ec7c L\u00e0m C\u1ee7a Ng\u00e0nh IT Sau Khi Ra Tr\u01b0\u1eddng?<\/a><\/strong><\/p>\n\n\n\n<p class=\"has-text-align-right\"><em>H\u00ecnh \u1ea3nh: S\u01b0u t\u1ea7m<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>B\u00ean c\u1ea1nh c\u00e1c m\u1eabu d\u1eef li\u1ec7u, c\u00e1c h\u00e0m t\u00ednh t\u00ednh to\u00e1n ch\u00ednh l\u00e0 c\u00f4ng c\u1ee5 \u0111\u1eafc l\u1ef1c gi\u00fap Machine Learning d\u1ef1 \u0111o\u00e1n ch\u00ednh x\u00e1c. Trong \u0111\u00f3, m\u1ed9t h\u00e0m t\u00ednh to\u00e1n c\u01a1 b\u1ea3n ng\u01b0\u1eddi m\u1edbi v\u00e0o ngh\u1ec1 nh\u1ea5t \u0111\u1ecbnh ph\u1ea3i bi\u1ebft ch\u00ednh l\u00e0 Cost Function. V\u1eady Cost Function l\u00e0 g\u00ec? Khi n\u00e0o c\u1ea7n s\u1eed d\u1ee5ng Cost [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":1845,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"cybocfi_hide_featured_image":"","footnotes":""},"categories":[86],"tags":[439],"class_list":["post-1840","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chia-se-kinh-nghiem","tag-cost-function-la-gi"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cost Function l\u00e0 g\u00ec? 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