{"id":476320,"date":"2023-08-09T07:28:31","date_gmt":"2023-08-09T07:28:31","guid":{"rendered":""},"modified":"2023-09-05T11:12:27","modified_gmt":"2023-09-05T11:12:27","slug":"collaborative-filtering","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/collaborative-filtering\/","title":{"rendered":"L\u1ecdc c\u1ed9ng t\u00e1c"},"content":{"rendered":"<p>L\u1ecdc c\u1ed9ng t\u00e1c (CF) l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p thu\u1eadt to\u00e1n m\u1ea1nh m\u1ebd th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong l\u0129nh v\u1ef1c h\u1ec7 th\u1ed1ng \u0111\u1ec1 xu\u1ea5t. Ti\u1ec1n \u0111\u1ec1 c\u01a1 b\u1ea3n c\u1ee7a n\u00f3 l\u00e0 d\u1ef1 \u0111o\u00e1n s\u1edf th\u00edch c\u1ee7a m\u1ed9t ng\u01b0\u1eddi d\u00f9ng c\u1ee5 th\u1ec3 b\u1eb1ng c\u00e1ch thu th\u1eadp s\u1edf th\u00edch t\u1eeb nhi\u1ec1u ng\u01b0\u1eddi d\u00f9ng. Gi\u1ea3 \u0111\u1ecbnh c\u1ee7ng c\u1ed1 CF l\u00e0 n\u1ebfu hai ng\u01b0\u1eddi d\u00f9ng \u0111\u1ed3ng \u00fd v\u1ec1 m\u1ed9t v\u1ea5n \u0111\u1ec1 th\u00ec h\u1ecd c\u0169ng c\u00f3 kh\u1ea3 n\u0103ng \u0111\u1ed3ng \u00fd v\u1ec1 nh\u1eefng v\u1ea5n \u0111\u1ec1 kh\u00e1c.<\/p>\n<h2>Ngu\u1ed3n g\u1ed1c v\u00e0 s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a l\u1ecdc c\u1ed9ng t\u00e1c<\/h2>\n<p>L\u1ecdc c\u1ed9ng t\u00e1c \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp l\u1ea7n \u0111\u1ea7u ti\u00ean v\u00e0o n\u0103m 1992 b\u1edfi David Goldberg v\u00e0 nh\u1eefng ng\u01b0\u1eddi kh\u00e1c t\u1eeb Xerox PARC khi ph\u00e1t tri\u1ec3n Tapestry, m\u1ed9t h\u1ec7 th\u1ed1ng email th\u1eddi k\u1ef3 \u0111\u1ea7u. Tapestry \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 s\u1eed d\u1ee5ng tr\u00ed th\u00f4ng minh c\u1ee7a con ng\u01b0\u1eddi v\u00e0 cho ph\u00e9p m\u1ecdi ng\u01b0\u1eddi th\u00eam ch\u00fa th\u00edch ho\u1eb7c \u201cth\u1ebb\u201d v\u00e0o c\u00e1c tin nh\u1eafn \u0111\u1ebfn, sau n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u1ecdc tin nh\u1eafn.<\/p>\n<p>N\u0103m 1994, d\u1ef1 \u00e1n GroupLens c\u1ee7a \u0110\u1ea1i h\u1ecdc Minnesota \u0111\u00e3 gi\u1edbi thi\u1ec7u thu\u1eadt ng\u1eef \u201cl\u1ecdc c\u1ed9ng t\u00e1c\u201d b\u1eb1ng c\u00e1ch \u0111\u1ec1 xu\u1ea5t ph\u01b0\u01a1ng ph\u00e1p CF t\u1ef1 \u0111\u1ed9ng. D\u1ef1 \u00e1n n\u00e0y s\u1eed d\u1ee5ng CF cho tin t\u1ee9c Usenet\u2014m\u1ed9t m\u1ea1ng l\u01b0\u1edbi c\u00e1c nh\u00f3m tin m\u00e0 ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 \u0111\u0103ng l\u00ean v\u00e0 h\u1ecd c\u00f3 th\u1ec3 l\u1ecdc theo s\u1edf th\u00edch c\u1ee7a m\u00ecnh.<\/p>\n<h2>Khai th\u00e1c t\u00ednh n\u0103ng l\u1ecdc c\u1ed9ng t\u00e1c<\/h2>\n<p>L\u1ecdc c\u1ed9ng t\u00e1c ch\u1ee7 y\u1ebfu ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch t\u1ea1o ma tr\u1eadn m\u1ee5c ng\u01b0\u1eddi d\u00f9ng ch\u1ee9a c\u00e1c t\u00f9y ch\u1ecdn (nh\u01b0 x\u1ebfp h\u1ea1ng) do ng\u01b0\u1eddi d\u00f9ng cung c\u1ea5p cho c\u00e1c m\u1ee5c. V\u00ed d\u1ee5: trong ng\u1eef c\u1ea3nh c\u1ee7a h\u1ec7 th\u1ed1ng \u0111\u1ec1 xu\u1ea5t phim, ma tr\u1eadn n\u00e0y s\u1ebd ch\u1ee9a c\u00e1c x\u1ebfp h\u1ea1ng do ng\u01b0\u1eddi d\u00f9ng \u0111\u01b0a ra cho c\u00e1c b\u1ed9 phim kh\u00e1c nhau.<\/p>\n<p>CF d\u1ef1a tr\u00ean hai m\u00f4 h\u00ecnh ch\u00ednh: CF d\u1ef1a tr\u00ean b\u1ed9 nh\u1edb v\u00e0 CF d\u1ef1a tr\u00ean m\u00f4 h\u00ecnh.<\/p>\n<ul>\n<li>\n<p>CF d\u1ef1a tr\u00ean b\u1ed9 nh\u1edb: C\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 CF d\u1ef1a tr\u00ean v\u00f9ng l\u00e2n c\u1eadn, m\u00f4 h\u00ecnh n\u00e0y \u0111\u01b0a ra d\u1ef1 \u0111o\u00e1n d\u1ef1a tr\u00ean s\u1ef1 gi\u1ed1ng nhau gi\u1eefa ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c v\u1eadt ph\u1ea9m. N\u00f3 \u0111\u01b0\u1ee3c chia th\u00e0nh CF ng\u01b0\u1eddi d\u00f9ng-ng\u01b0\u1eddi d\u00f9ng (x\u00e1c \u0111\u1ecbnh ng\u01b0\u1eddi d\u00f9ng t\u01b0\u01a1ng t\u1ef1 v\u1edbi ng\u01b0\u1eddi d\u00f9ng \u0111\u01b0\u1ee3c d\u1ef1 \u0111o\u00e1n) v\u00e0 CF m\u1ee5c-m\u1ee5c (x\u00e1c \u0111\u1ecbnh c\u00e1c m\u1ee5c t\u01b0\u01a1ng t\u1ef1 v\u1edbi nh\u1eefng m\u1ee5c m\u00e0 ng\u01b0\u1eddi d\u00f9ng \u0111\u00e3 x\u1ebfp h\u1ea1ng).<\/p>\n<\/li>\n<li>\n<p>CF d\u1ef1a tr\u00ean m\u00f4 h\u00ecnh: C\u00e1ch ti\u1ebfp c\u1eadn n\u00e0y li\u00ean quan \u0111\u1ebfn vi\u1ec7c ph\u00e1t tri\u1ec3n m\u00f4 h\u00ecnh ng\u01b0\u1eddi d\u00f9ng \u0111\u1ec3 t\u00ecm hi\u1ec3u s\u1edf th\u00edch c\u1ee7a h\u1ecd. C\u00e1c k\u1ef9 thu\u1eadt li\u00ean quan l\u00e0 ph\u00e2n c\u1ee5m, nh\u00e2n t\u1ed1 ma tr\u1eadn, h\u1ecdc s\u00e2u, v.v.<\/p>\n<\/li>\n<\/ul>\n<h2>C\u01a1 ch\u1ebf \u0111\u1eb1ng sau vi\u1ec7c l\u1ecdc c\u1ed9ng t\u00e1c<\/h2>\n<p>V\u1ec1 c\u1ed1t l\u00f5i, quy tr\u00ecnh L\u1ecdc c\u1ed9ng t\u00e1c bao g\u1ed3m hai b\u01b0\u1edbc: t\u00ecm ng\u01b0\u1eddi d\u00f9ng c\u00f3 s\u1edf th\u00edch t\u01b0\u01a1ng t\u1ef1 v\u00e0 \u0111\u1ec1 xu\u1ea5t c\u00e1c m\u1eb7t h\u00e0ng d\u1ef1a tr\u00ean s\u1edf th\u00edch c\u1ee7a nh\u1eefng ng\u01b0\u1eddi d\u00f9ng t\u01b0\u01a1ng t\u1ef1 n\u00e0y. \u0110\u00e2y l\u00e0 m\u1ed9t ph\u00e1c th\u1ea3o chung v\u1ec1 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a n\u00f3:<\/p>\n<ol>\n<li>T\u00ednh to\u00e1n \u0111\u1ed9 t\u01b0\u01a1ng t\u1ef1 gi\u1eefa ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c v\u1eadt ph\u1ea9m.<\/li>\n<li>D\u1ef1 \u0111o\u00e1n x\u1ebfp h\u1ea1ng c\u1ee7a c\u00e1c m\u1ee5c ch\u01b0a \u0111\u01b0\u1ee3c ng\u01b0\u1eddi d\u00f9ng x\u1ebfp h\u1ea1ng.<\/li>\n<li>\u0110\u1ec1 xu\u1ea5t N m\u1ee5c h\u00e0ng \u0111\u1ea7u c\u00f3 x\u1ebfp h\u1ea1ng d\u1ef1 \u0111o\u00e1n cao nh\u1ea5t.<\/li>\n<\/ol>\n<p>\u0110\u1ed9 t\u01b0\u01a1ng t\u1ef1 gi\u1eefa ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c v\u1eadt ph\u1ea9m th\u01b0\u1eddng \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng \u0111\u1ed9 t\u01b0\u01a1ng t\u1ef1 cosine ho\u1eb7c t\u01b0\u01a1ng quan Pearson.<\/p>\n<h2>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a l\u1ecdc c\u1ed9ng t\u00e1c<\/h2>\n<ol>\n<li><strong>C\u00e1 nh\u00e2n h\u00f3a:<\/strong> CF cung c\u1ea5p c\u00e1c \u0111\u1ec1 xu\u1ea5t \u0111\u01b0\u1ee3c c\u00e1 nh\u00e2n h\u00f3a v\u00ec n\u00f3 xem x\u00e9t h\u00e0nh vi c\u1ee7a t\u1eebng ng\u01b0\u1eddi d\u00f9ng trong khi \u0111\u1ec1 xu\u1ea5t.<\/li>\n<li><strong>Kh\u1ea3 n\u0103ng th\u00edch \u1ee9ng:<\/strong> N\u00f3 c\u00f3 th\u1ec3 th\u00edch \u1ee9ng v\u1edbi s\u1edf th\u00edch thay \u0111\u1ed5i c\u1ee7a ng\u01b0\u1eddi d\u00f9ng.<\/li>\n<li><strong>Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng:<\/strong> Thu\u1eadt to\u00e1n CF c\u00f3 kh\u1ea3 n\u0103ng x\u1eed l\u00fd l\u01b0\u1ee3ng l\u1edbn d\u1eef li\u1ec7u.<\/li>\n<li><strong>V\u1ea5n \u0111\u1ec1 kh\u1edfi \u0111\u1ed9ng ngu\u1ed9i:<\/strong> Ng\u01b0\u1eddi d\u00f9ng m\u1edbi ho\u1eb7c m\u1eb7t h\u00e0ng m\u1edbi c\u00f3 th\u1ec3 g\u1eb7p v\u1ea5n \u0111\u1ec1 v\u00ec kh\u00f4ng c\u00f3 \u0111\u1ee7 d\u1eef li\u1ec7u \u0111\u1ec3 \u0111\u01b0a ra \u0111\u1ec1 xu\u1ea5t ch\u00ednh x\u00e1c\u2014v\u1ea5n \u0111\u1ec1 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 v\u1ea5n \u0111\u1ec1 kh\u1edfi \u0111\u1ed9ng ngu\u1ed9i.<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i l\u1ecdc c\u1ed9ng t\u00e1c<\/h2>\n<table>\n<thead>\n<tr>\n<th><strong>Ki\u1ec3u<\/strong><\/th>\n<th><strong>S\u1ef1 mi\u00eau t\u1ea3<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>CF d\u1ef1a tr\u00ean b\u1ed9 nh\u1edb<\/td>\n<td>S\u1eed d\u1ee5ng b\u1ed9 nh\u1edb v\u1ec1 c\u00e1c t\u01b0\u01a1ng t\u00e1c c\u1ee7a ng\u01b0\u1eddi d\u00f9ng tr\u01b0\u1edbc \u0111\u00f3 \u0111\u1ec3 t\u00ednh to\u00e1n \u0111\u1ed9 t\u01b0\u01a1ng t\u1ef1 c\u1ee7a ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c c\u00e1c m\u1eb7t h\u00e0ng.<\/td>\n<\/tr>\n<tr>\n<td>CF d\u1ef1a tr\u00ean m\u00f4 h\u00ecnh<\/td>\n<td>Bao g\u1ed3m m\u1ed9t b\u01b0\u1edbc h\u1ecdc m\u00f4 h\u00ecnh, sau \u0111\u00f3 s\u1eed d\u1ee5ng m\u00f4 h\u00ecnh n\u00e0y \u0111\u1ec3 \u0111\u01b0a ra d\u1ef1 \u0111o\u00e1n.<\/td>\n<\/tr>\n<tr>\n<td>CF lai<\/td>\n<td>K\u1ebft h\u1ee3p c\u00e1c ph\u01b0\u01a1ng ph\u00e1p d\u1ef1a tr\u00ean b\u1ed9 nh\u1edb v\u00e0 d\u1ef1a tr\u00ean m\u00f4 h\u00ecnh \u0111\u1ec3 kh\u1eafc ph\u1ee5c m\u1ed9t s\u1ed1 h\u1ea1n ch\u1ebf.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>S\u1eed d\u1ee5ng L\u1ecdc c\u1ed9ng t\u00e1c: Nh\u1eefng th\u00e1ch th\u1ee9c v\u00e0 gi\u1ea3i ph\u00e1p<\/h2>\n<p>CF \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau bao g\u1ed3m nh\u01b0ng kh\u00f4ng gi\u1edbi h\u1ea1n \u1edf phim \u1ea3nh, \u00e2m nh\u1ea1c, tin t\u1ee9c, s\u00e1ch, b\u00e0i b\u00e1o nghi\u00ean c\u1ee9u, truy v\u1ea5n t\u00ecm ki\u1ebfm, th\u1ebb x\u00e3 h\u1ed9i v\u00e0 s\u1ea3n ph\u1ea9m n\u00f3i chung. Tuy nhi\u00ean, c\u00f2n c\u00f3 nh\u1eefng th\u00e1ch th\u1ee9c nh\u01b0:<\/p>\n<ol>\n<li><strong>V\u1ea5n \u0111\u1ec1 kh\u1edfi \u0111\u1ed9ng ngu\u1ed9i:<\/strong> Gi\u1ea3i ph\u00e1p n\u1eb1m \u1edf c\u00e1c m\u00f4 h\u00ecnh k\u1ebft h\u1ee3p k\u1ebft h\u1ee3p l\u1ecdc d\u1ef1a tr\u00ean n\u1ed9i dung ho\u1eb7c s\u1eed d\u1ee5ng si\u00eau d\u1eef li\u1ec7u b\u1ed5 sung v\u1ec1 ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c m\u1ee5c.<\/li>\n<li><strong>\u0110\u1ed9 th\u01b0a th\u1edbt:<\/strong> Nhi\u1ec1u ng\u01b0\u1eddi d\u00f9ng t\u01b0\u01a1ng t\u00e1c v\u1edbi m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng nh\u1ecf c\u00e1c m\u1ee5c, khi\u1ebfn ma tr\u1eadn m\u1ee5c ng\u01b0\u1eddi d\u00f9ng tr\u1edf n\u00ean th\u01b0a th\u1edbt. C\u00e1c k\u1ef9 thu\u1eadt gi\u1ea3m k\u00edch th\u01b0\u1edbc, nh\u01b0 ph\u00e2n t\u00e1ch gi\u00e1 tr\u1ecb s\u1ed1 \u00edt, c\u00f3 th\u1ec3 gi\u1ea3m thi\u1ec3u v\u1ea5n \u0111\u1ec1 n\u00e0y.<\/li>\n<li><strong>Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng:<\/strong> Khi d\u1eef li\u1ec7u ph\u00e1t tri\u1ec3n, vi\u1ec7c \u0111\u01b0a ra c\u00e1c \u0111\u1ec1 xu\u1ea5t nhanh ch\u00f3ng c\u00f3 th\u1ec3 \u0111\u00f2i h\u1ecfi c\u01b0\u1eddng \u0111\u1ed9 t\u00ednh to\u00e1n cao. C\u00e1c gi\u1ea3i ph\u00e1p li\u00ean quan \u0111\u1ebfn \u0111i\u1ec7n to\u00e1n ph\u00e2n t\u00e1n ho\u1eb7c s\u1eed d\u1ee5ng c\u00e1c thu\u1eadt to\u00e1n c\u00f3 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng h\u01a1n.<\/li>\n<\/ol>\n<h2>So s\u00e1nh v\u1edbi c\u00e1c k\u1ef9 thu\u1eadt t\u01b0\u01a1ng t\u1ef1<\/h2>\n<table>\n<thead>\n<tr>\n<th><strong>Ph\u01b0\u01a1ng ph\u00e1p<\/strong><\/th>\n<th><strong>S\u1ef1 mi\u00eau t\u1ea3<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>L\u1ecdc c\u1ed9ng t\u00e1c<\/td>\n<td>D\u1ef1a tr\u00ean gi\u1ea3 \u0111\u1ecbnh r\u1eb1ng m\u1ecdi ng\u01b0\u1eddi th\u00edch nh\u1eefng th\u1ee9 t\u01b0\u01a1ng t\u1ef1 nh\u01b0 nh\u1eefng g\u00ec h\u1ecd th\u00edch trong qu\u00e1 kh\u1ee9 v\u00e0 nh\u1eefng th\u1ee9 \u0111\u01b0\u1ee3c nh\u1eefng ng\u01b0\u1eddi c\u00f3 c\u00f9ng s\u1edf th\u00edch th\u00edch.<\/td>\n<\/tr>\n<tr>\n<td>L\u1ecdc d\u1ef1a tr\u00ean n\u1ed9i dung<\/td>\n<td>\u0110\u1ec1 xu\u1ea5t c\u00e1c m\u1eb7t h\u00e0ng b\u1eb1ng c\u00e1ch so s\u00e1nh n\u1ed9i dung c\u1ee7a c\u00e1c m\u1eb7t h\u00e0ng v\u00e0 h\u1ed3 s\u01a1 c\u1ee7a ng\u01b0\u1eddi d\u00f9ng.<\/td>\n<\/tr>\n<tr>\n<td>Ph\u01b0\u01a1ng ph\u00e1p lai<\/td>\n<td>C\u00e1c ph\u01b0\u01a1ng ph\u00e1p n\u00e0y k\u1ebft h\u1ee3p L\u1ecdc c\u1ed9ng t\u00e1c v\u00e0 L\u1ecdc d\u1ef1a tr\u00ean n\u1ed9i dung, nh\u1eb1m tr\u00e1nh nh\u1eefng h\u1ea1n ch\u1ebf nh\u1ea5t \u0111\u1ecbnh.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Quan \u0111i\u1ec3m t\u01b0\u01a1ng lai v\u1ec1 l\u1ecdc c\u1ed9ng t\u00e1c<\/h2>\n<p>V\u1edbi s\u1ef1 ra \u0111\u1eddi c\u1ee7a c\u00f4ng ngh\u1ec7 h\u1ecdc m\u00e1y v\u00e0 tr\u00ed tu\u1ec7 nh\u00e2n t\u1ea1o ph\u1ee9c t\u1ea1p h\u01a1n, c\u00e1c ph\u01b0\u01a1ng ph\u00e1p CF \u0111ang ph\u00e1t tri\u1ec3n. C\u00e1c k\u1ef9 thu\u1eadt h\u1ecdc s\u00e2u hi\u1ec7n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ph\u00e1t tri\u1ec3n c\u00e1c m\u00f4 h\u00ecnh ph\u1ee9c t\u1ea1p cho CF, cung c\u1ea5p c\u00e1c \u0111\u1ec1 xu\u1ea5t ch\u00ednh x\u00e1c h\u01a1n. H\u01a1n n\u1eefa, nghi\u00ean c\u1ee9u nh\u1eb1m gi\u1ea3i quy\u1ebft c\u00e1c th\u00e1ch th\u1ee9c v\u1ec1 \u0111\u1ed9 th\u01b0a th\u1edbt d\u1eef li\u1ec7u v\u00e0 v\u1ea5n \u0111\u1ec1 kh\u1edfi \u0111\u1ed9ng ngu\u1ed9i \u0111ang \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh, h\u1ee9a h\u1eb9n c\u00e1c ph\u01b0\u01a1ng ph\u00e1p CF hi\u1ec7u qu\u1ea3 v\u00e0 hi\u1ec7u qu\u1ea3 h\u01a1n trong t\u01b0\u01a1ng lai.<\/p>\n<h2>M\u00e1y ch\u1ee7 proxy v\u00e0 l\u1ecdc c\u1ed9ng t\u00e1c<\/h2>\n<p>C\u00e1c m\u00e1y ch\u1ee7 proxy, gi\u1ed1ng nh\u01b0 c\u00e1c m\u00e1y ch\u1ee7 do OneProxy cung c\u1ea5p, c\u00f3 th\u1ec3 gi\u00e1n ti\u1ebfp h\u1ed7 tr\u1ee3 L\u1ecdc c\u1ed9ng t\u00e1c. Ch\u00fang cung c\u1ea5p t\u00ednh \u1ea9n danh v\u00e0 b\u1ea3o m\u1eadt, cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng duy\u1ec7t web v\u1edbi s\u1ef1 ri\u00eang t\u01b0. \u0110i\u1ec1u n\u00e0y khuy\u1ebfn kh\u00edch ng\u01b0\u1eddi d\u00f9ng t\u1ef1 do t\u01b0\u01a1ng t\u00e1c v\u1edbi c\u00e1c m\u1ee5c tr\u00ean internet m\u00e0 kh\u00f4ng s\u1ee3 x\u00e2m ph\u1ea1m quy\u1ec1n ri\u00eang t\u01b0 c\u1ee7a h\u1ecd. D\u1eef li\u1ec7u thu \u0111\u01b0\u1ee3c r\u1ea5t c\u1ea7n thi\u1ebft cho CF v\u00ec n\u00f3 ph\u1ee5 thu\u1ed9c r\u1ea5t nhi\u1ec1u v\u00e0o t\u01b0\u01a1ng t\u00e1c gi\u1eefa ng\u01b0\u1eddi d\u00f9ng v\u00e0 m\u1ee5c \u0111\u1ec3 \u0111\u01b0a ra \u0111\u1ec1 xu\u1ea5t.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<ol>\n<li><a href=\"http:\/\/grouplens.org\/\" target=\"_new\" rel=\"noopener nofollow\">Nghi\u00ean c\u1ee9u \u1ed1ng k\u00ednh nh\u00f3m<\/a><\/li>\n<li><a href=\"https:\/\/research.netflix.com\/\" target=\"_new\" rel=\"noopener nofollow\">Nghi\u00ean c\u1ee9u Netflix<\/a><\/li>\n<li><a href=\"https:\/\/www.amazon.science\/tag\/recommendation\" target=\"_new\" rel=\"noopener nofollow\">Nghi\u00ean c\u1ee9u Amazon<\/a><\/li>\n<li><a href=\"https:\/\/dl.acm.org\/\" target=\"_new\" rel=\"noopener nofollow\">Th\u01b0 vi\u1ec7n s\u1ed1 ACM<\/a> cho nghi\u00ean c\u1ee9u h\u1ecdc thu\u1eadt v\u1ec1 L\u1ecdc c\u1ed9ng t\u00e1c<\/li>\n<li><a href=\"https:\/\/scholar.google.com\/\" target=\"_new\" rel=\"noopener nofollow\">H\u1ecdc gi\u1ea3 Google<\/a> cho c\u00e1c t\u00e0i li\u1ec7u h\u1ecdc thu\u1eadt v\u1ec1 L\u1ecdc c\u1ed9ng t\u00e1c<\/li>\n<\/ol>","protected":false},"featured_media":0,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-476320","wiki","type-wiki","status-publish","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Collaborative Filtering: A Comprehensive Guide<\/mark>","faq_items":[{"question":"What is Collaborative Filtering?","answer":"<p>Collaborative Filtering (CF) is an algorithmic method used within recommendation systems to predict a specific user's interests based on the preferences collected from numerous users.<\/p>"},{"question":"What is the history of Collaborative Filtering?","answer":"<p>The term Collaborative Filtering was first introduced in the GroupLens project by the University of Minnesota in 1994, which was designed for Usenet news. However, the concept was first mentioned in 1992 by David Goldberg and others from Xerox PARC, who developed Tapestry, an early email system that allowed users to filter messages based on tags.<\/p>"},{"question":"How does Collaborative Filtering work?","answer":"<p>Collaborative Filtering works by creating a user-item matrix, which is filled with the preferences (such as ratings) given by users to items. It then calculates the similarity between users or items, predicts the ratings of the items not yet rated by a user, and recommends the top-N items with the highest predicted ratings.<\/p>"},{"question":"What are the key features of Collaborative Filtering?","answer":"<p>The key features of Collaborative Filtering include personalization, adaptability, and scalability. However, it does have challenges such as the cold start problem, which is when there is insufficient data to make accurate recommendations for new users or items.<\/p>"},{"question":"What types of Collaborative Filtering exist?","answer":"<p>There are three main types of Collaborative Filtering: Memory-based CF that uses the memory of previous users' interactions to compute user or item similarity, Model-based CF that learns a model to predict user preferences, and Hybrid CF that combines the Memory-based and Model-based methods to overcome certain limitations.<\/p>"},{"question":"How is Collaborative Filtering used and what are the associated problems?","answer":"<p>Collaborative Filtering is used in various domains such as movies, music, news, books, research articles, search queries, social tags, and general products. The associated challenges include the cold start problem, sparsity, and scalability. However, solutions exist, such as hybrid models, dimensionality reduction techniques, and the use of more scalable algorithms.<\/p>"},{"question":"How does Collaborative Filtering compare to similar techniques?","answer":"<p>Collaborative Filtering is based on the assumption that users will like things similar to what they liked in the past and things liked by people with similar tastes. This contrasts with Content-Based Filtering, which recommends items by comparing the content of the items and a user profile. Hybrid Methods combine Collaborative Filtering and Content-Based Filtering to avoid certain limitations.<\/p>"},{"question":"What are the future perspectives on Collaborative Filtering?","answer":"<p>The future of Collaborative Filtering includes the advent of more sophisticated machine learning and artificial intelligence technologies. Deep learning techniques are being used to develop complex models for CF, providing more accurate recommendations. Ongoing research aims to address challenges of data sparsity and the cold start problem.<\/p>"},{"question":"How are proxy servers associated with Collaborative Filtering?","answer":"<p>Proxy servers can indirectly aid in Collaborative Filtering by providing anonymity and security, which allows users to browse with privacy. This encourages users to freely interact with items on the internet without fearing to compromise their privacy, leading to more user-item interaction data that CF relies on for making recommendations.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476320","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476320\/revisions"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=476320"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}