{"id":1334,"date":"2021-01-06T08:23:13","date_gmt":"2021-01-06T01:23:13","guid":{"rendered":"http:\/\/www.miai.vn\/?p=1334"},"modified":"2021-01-06T08:23:13","modified_gmt":"2021-01-06T01:23:13","slug":"nhin-doi-theo-cach-cua-mang-cnn-visualize-feature-maps-heatmap","status":"publish","type":"post","link":"https:\/\/miai.vn\/?p=1334","title":{"rendered":"Nh\u00ecn \u0111\u1eddi theo c\u00e1ch c\u1ee7a m\u1ea1ng CNN (visualize feature maps- heatmap)"},"content":{"rendered":"\n

Hello anh em, ch\u00fang ta \u0111\u00e3 l\u00e0m vi\u1ec7c v\u1edbi m\u1ea1ng CNN \u0111\u00e3 l\u00e2u l\u1eafm r\u1ed3i, h\u00f4m nay ch\u00fang ta s\u1ebd \u0111i \u0111\u1ebfn m\u1ed9t m\u00f3n m\u1edbi h\u01a1n l\u00e0 nh\u00ecn \u0111\u1eddi theo c\u00e1ch c\u1ee7a m\u1ea1ng CNN nh\u00e9 (visualize feature maps, heatmap).<\/p>\n\n\n\n

Ch\u00fang ta s\u1ebd c\u00f9ng t\u00ecm hi\u1ec3u xem khi ta \u0111\u01b0a m\u1ed9t v\u00e0o m\u1ea1ng m\u1ed9t h\u00ecnh \u1ea3nh (m\u1ed9t c\u00f4 g\u00e1i ch\u1eb3ng h\u1ea1n) th\u00ec \u00f4ng CNN \u00f4ng \u1ea5y nh\u00ecn th\u1ea5y c\u00f4 g\u00e1i \u0111\u00f3 nh\u01b0 n\u00e0o? C\u00f3 nh\u01b0 ta nh\u00ecn kh\u00f4ng? V\u00e0 t\u1eadp trung v\u00e0o ph\u1ea7n n\u00e0o c\u1ee7a c\u00f4 g\u00e1i? C\u00f3 gi\u1ed1ng ch\u00fang ta khi nh\u00ecn v\u00e0o c\u00e1c c\u00f4 g\u00e1i th\u00ec hay t\u1eadp trung v\u00e0o “v..” ……………\u00fd m\u00ecnh l\u00e0 v\u1ebb \u0111\u1eb9p kh\u00f4ng =))<\/p>\n\n\n\n

Ph\u1ea7n 1 – Nh\u1eafc l\u1ea1i ch\u00fat v\u1ec1 m\u1ea1ng CNN v\u00e0 c\u00e1ch CNN nh\u00ecn \u0111\u1eddi<\/h2>\n\n\n\n
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Ngu\u1ed3n: T\u1ea1i \u0111\u00e2y<\/a><\/figcaption><\/figure>\n\n\n\n

Nh\u01b0 c\u00e1c b\u00e0i tr\u01b0\u1edbc m\u00ecnh \u0111\u00e3 vi\u1ebft tr\u00ean M\u00ec AI Blog c\u0169ng nh\u01b0 k\u00eanh youtube M\u00ec AI, CNN s\u1eed d\u1ee5ng c\u00e1c kh\u00e1i ni\u1ec7m c\u00e1c filter v\u1edbi c\u00e1c kernel size kh\u00e1c nhau \u0111\u1ec3 qu\u00e9t qua t\u1ea5m \u1ea3nh t\u1eeb tr\u00ean xu\u1ed1ng d\u01b0\u1edbi, t\u1eeb tr\u00e1i sang ph\u1ea3i (l\u00fd thuy\u1ebft th\u00f4i nh\u00e9, th\u1ef1c t\u1ebf train qua GPU n\u00f3 ch\u01a1i \u0111\u1ed3ng th\u1eddi lu\u00f4n \u00e1). Sau khi qu\u00e9t xong, n\u00f3 s\u1ebd t\u1ea1o ra (b\u1eb1ng c\u00e1ch nh\u00e2n l\u1ea7n l\u01b0\u1ee3t ma tr\u1eadn filter v\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a t\u1ea5m \u1ea3nh) c\u00e1c feature maps – c\u00e1c \u0111\u1eb7c tr\u01b0ng tr\u00edch ra \u0111\u01b0\u1ee3c t\u1eeb t\u1ea5m \u1ea3nh.<\/p>\n\n\n\n

\u0110\u00f3, v\u00e0 features maps ch\u00ednh l\u00e0 nh\u1eefng g\u00ec m\u00e0 CNN nh\u00ecn th\u1ea5y t\u1eeb t\u1ea5m \u1ea3nh.<\/p>\n\n\n\n

R\u1ed3i, nh\u01b0ng ta s\u1ebd th\u1eafc m\u1eafc trong nh\u1eefng th\u1ee9 m\u00e0 CNN n\u00f3 nh\u00ecn th\u1ea5y th\u00ec n\u00f3 t\u1eadp trung v\u00e0o ph\u1ea7n n\u00e0o nh\u1ea5t \u0111\u1ec3 c\u00f3 th\u1ec3 predict ra \u0111\u00fang class c\u1ee7a t\u1ea5m \u1ea3nh. V\u00ed d\u1ee5: \u0111\u01b0a v\u00e0o m\u1ed9t t\u1ea5m \u1ea3nh, CNN predict ra l\u00e0 GIRL, v\u1eady ch\u00fang ta c\u1ea7n bi\u1ebft \u0111\u01b0\u1ee3c model \u0111\u00e3 d\u1ef1a v\u00e0o ph\u1ea7n n\u00e0o trong nh\u1eefng ph\u1ea7n n\u00f3 nh\u00ecn th\u1ea5y \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n \u0111\u00e2y l\u00e0 girl.<\/p>\n\n\n\n

Ch\u00fang ta s\u1ebd c\u00f9ng nhau t\u00ecm hi\u1ec3u c\u00e1c v\u1ea5n \u0111\u1ec1 tr\u00ean nh\u00e9! Trong b\u00e0i n\u00e0y ta s\u1ebd c\u00f9ng m\u1ed5 x\u1ebb v\u00e0 t\u00ecm hi\u1ec3u (visualize feature maps, heatmap) v\u1edbi m\u1ed9t model c\u1ee5 th\u1ec3 l\u00e0 VGG16.<\/p>\n\n\n\n

Ph\u1ea7n 2 – T\u00ecm hi\u1ec3u xem CNN nh\u00ecn th\u1ea5y nh\u1eefng g\u00ec? (visualize feature maps)<\/h2>\n\n\n\n

Th\u1ef1c ra l\u00e0 ch\u00fang ta s\u1ebd in ra c\u00e1c Feature Maps \u1ea5y m\u00e0 kaka!<\/p>\n\n\n\n

R\u1ed3i, VGG16 th\u00ec m\u1ecdi ng\u01b0\u1eddi r\u00f5 ki\u1ebfn tr\u00fac c\u1ee7a n\u00f3 r\u1ed3i, c\u1ee5 th\u1ec3 nh\u01b0 sau:<\/p>\n\n\n\n<\/ins>\n