{"id":1482,"date":"2020-09-03T15:10:31","date_gmt":"2020-09-03T07:10:31","guid":{"rendered":"http:\/\/home.wangjianshuo.com\/cn\/?p=1482"},"modified":"2020-09-03T15:10:31","modified_gmt":"2020-09-03T07:10:31","slug":"%e5%8d%b7%e7%a7%af%e7%bd%91%e7%bb%9c-cnn-%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0%e4%b9%8b%e4%ba%94%ef%bc%9a%e5%b0%b1%e5%83%8f%e5%8c%bb%e7%94%9f%e7%9c%8b%e5%8c%96%e9%aa%8c%e5%8d%95","status":"publish","type":"post","link":"https:\/\/home.wangjianshuo.com\/cn\/20200903_%e5%8d%b7%e7%a7%af%e7%bd%91%e7%bb%9c-cnn-%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0%e4%b9%8b%e4%ba%94%ef%bc%9a%e5%b0%b1%e5%83%8f%e5%8c%bb%e7%94%9f%e7%9c%8b%e5%8c%96%e9%aa%8c%e5%8d%95.htm","title":{"rendered":"\u5377\u79ef\u7f51\u7edc CNN \u5b66\u4e60\u7b14\u8bb0\u4e4b\u4e94\uff1a\u5c31\u50cf\u533b\u751f\u770b\u5316\u9a8c\u5355"},"content":{"rendered":"<div id=\"wechat\">\n<p style=\"text-align: left;\"><a data-itemshowtype=\"0\" data-linktype=\"2\" href=\"http:\/\/mp.weixin.qq.com\/s?__biz=MjM5NzI0Mjg0MA==&amp;mid=2652371437&amp;idx=1&amp;sn=57a20e87ac2aaed52adfe3b0e6a1e4d8&amp;chksm=bd3fab5a8a48224c62d0ac433d1c7e1336f41f01fdcd060c0123d93f2acabf24519951f77ebf&amp;scene=21#wechat_redirect\" tab=\"innerlink\" target=\"_blank\" rel=\"noopener noreferrer\">\u5b66\u4e60\u7b14\u8bb0\u4e4b\u4e00\uff1a\u6211\u4eec\u662f\u600e\u4e48\u8ba4\u8bc60\u7684<\/a><\/p>\n<p style=\"text-align: left;\"><a data-itemshowtype=\"0\" data-linktype=\"2\" href=\"http:\/\/mp.weixin.qq.com\/s?__biz=MjM5NzI0Mjg0MA==&amp;mid=2652371505&amp;idx=1&amp;sn=dc38b21c72f119b9d34362791d08cb45&amp;chksm=bd3fa8868a48219016f6dbcc2149eff5128eb2231828a69aaadc152f1426fb05eb26ed95d353&amp;scene=21#wechat_redirect\" tab=\"innerlink\" target=\"_blank\" rel=\"noopener noreferrer\">\u5b66\u4e60\u7b14\u8bb0\u4e4b\u4e8c\uff1a\u7ec6\u8282\u6d88\u5931\uff0c\u62bd\u8c61\u751f\u6210<\/a><\/p>\n<p style=\"text-align: left;\"><a data-itemshowtype=\"0\" data-linktype=\"2\" href=\"http:\/\/mp.weixin.qq.com\/s?__biz=MjM5NzI0Mjg0MA==&amp;mid=2652371548&amp;idx=1&amp;sn=3c56ef4fd73a714c018ba954e44bc950&amp;chksm=bd3fa8eb8a4821fd0fc757afe6e85b1989dfac9feafb0901c490f97537f600d4cf51b8b1253e&amp;scene=21#wechat_redirect\" tab=\"innerlink\" target=\"_blank\" rel=\"noopener noreferrer\">\u5b66\u4e60\u7b14\u8bb0\u4e4b\u4e09\uff1a\u5377\u79ef\u50cf\u5377\u5730\u6bef<\/a><\/p>\n<p style=\"text-align: left;\"><a data-itemshowtype=\"0\" data-linktype=\"2\" href=\"http:\/\/mp.weixin.qq.com\/s?__biz=MjM5NzI0Mjg0MA==&amp;mid=2652371581&amp;idx=1&amp;sn=86418ad4a2f335940c113d2255515ed0&amp;chksm=bd3fa8ca8a4821dc6cb766fc277114757e95ef3c40511cb008458506c3eafab37477dabd3ce2&amp;scene=21#wechat_redirect\" tab=\"innerlink\" target=\"_blank\" rel=\"noopener noreferrer\">\u5b66\u4e60\u7b14\u8bb0\u4e4b\u56db\uff1a\u6700\u7ec8\u5f62\u6210\u5224\u65ad<\/a><\/p>\n<p style=\"text-align: left;\">\u4eca\u5929\uff0c\u6211\u4eec\u770b\u4e0a\u4e00\u6b21\u7684\u4ee3\u7801\u8dd1\u8d77\u6765\u662f\u4ec0\u4e48\u6837\u5b50\u7684\u3002<\/p>\n<p style=\"text-align: left;\"><strong>\u8f93\u5165\u56fe\u50cf<\/strong><\/p>\n<p style=\"text-align: center;\"><img src=\"http:\/\/home.wangjianshuo.com\/cn\/2020\/09\/picture-16.jpg\"\/><\/p>\n<p style=\"text-align: left;\">\u8fd9\u4e2a\u662f\u8f93\u5165<span style=\"text-align: left;\">\u56fe\u50cf\uff0c\u7ef4\u5ea6<span style=\"text-align: left;\">\u662f 28x28x1 \u3002\u00a0<\/span>\u8fd9\u662f MNIST \u56fe\u50cf\u96c6\u91cc\u9762\u7684\u7b2c1002\u53f7\u6570\u5b57\u3002<\/span><span style=\"text-align: left;\">\u6211\u7528\u6211\u7684<\/span><span style=\"text-align: left;\">\u4eba\u8111\u5904\u7406\u4e86\u4e00\u4e0b<\/span><span style=\"text-align: left;\">\uff0c\u89c9\u5f97\u4f3c\u4e4e\u662f\u4e00\u4e2a\u00a0<\/span><span style=\"text-align: left;\">\u00a0<\/span><strong style=\"text-align: left;white-space: normal;\">1<\/strong><span style=\"text-align: left;\">\u00a0\u3002<\/span><span style=\"text-align: left;\">\u6211\u4eec\u770b\u770b\u7535\u8111\u5982\u4f55\u5904\u7406\u3002<\/span><\/p>\n<p style=\"text-align: left;\"><strong>\u5377\u79ef\u5c42<\/strong><\/p>\n<section class=\"code-snippet__fix code-snippet__js\">\n<ul class=\"code-snippet__line-index code-snippet__js\">\n<li><\/li>\n<\/ul>\n<pre class=\"code-snippet__js\" data-lang=\"cs\"><code><span class=\"code-snippet_outer\">model.<span class=\"code-snippet__keyword\">add<\/span>(Conv2D(<span class=\"code-snippet__number\">32<\/span>, kernel_size=(<span class=\"code-snippet__number\">3<\/span>, <span class=\"code-snippet__number\">3<\/span>), activation=<span class=\"code-snippet__string\">'relu'<\/span>, input_shape=(<span class=\"code-snippet__number\">28<\/span>, <span class=\"code-snippet__number\">28<\/span>, <span class=\"code-snippet__number\">1<\/span>)))<\/span><\/code><\/pre>\n<\/section>\n<p style=\"text-align: left;\">\u7ecf\u8fc7\u8bad\u7ec3\uff0c\u5f97\u5230\u5982\u4e0b 32 \u4e2a\u5377\u79ef\u6838\uff1a<\/p>\n<p style=\"text-align: center;\"><img src=\"http:\/\/home.wangjianshuo.com\/cn\/2020\/09\/picture-17.jpg\"\/><\/p>\n<p style=\"text-align: left;\">\u8f93\u5165\u7684\u56fe\u50cf\u7ecf\u8fc732\u4e2a\u8fc7\u6ee4\u5668\uff08filter\uff09\u4e4b\u540e\uff0c\u8f93\u51fa\u662f\u5982\u4e0b\u7684 32 \u4e2a 26&#215;26 \u7684\u56fe\u50cf\u3002\u5982\u679c\u4f60\u8fd8\u8bb0\u5f97\u7684\u8bdd\uff0c\u662f\u62ff\u5de6\u4e0a\u89d2\u7684 0 \u53f7\u8fc7\u6ee4\u5668\uff0c\u4ece\u8f93\u5165\u56fe\u50cf\u7684\u5de6\u4e0a\u89d2\u5f00\u59cb\uff0c9 \u4e2a\u70b9\u5bf9\u5e94\u7684 9 \u4e2a\u70b9\u5206\u522b\u76f8\u4e58\uff0c\u7136\u540e\u628a\u8fd9\u4e00\u4e2a\u50cf\u7d20\u7684\u6570\u636e\u8f93\u51fa\u5230\u4e0b\u9762\u7684\u56fe\u7684\u6700\u5de6\u4e0a\u89d2\u7684\u90a3\u4e2a\u50cf\u7d20\u3002\u5982\u6b64 26 x 26 \u6b21\u4ee5\u540e\u5f62\u6210\u5de6\u4e0a\u89d2\u7684\u56fe\u50cf\u3002\u518d\u5982\u6b64\u7528\u7b2c\u4e8c\u4e2a\u8fc7\u6ee4\u5668\u6765\u5236\u4f5c\u7b2c\u4e8c\u4e2a\u56fe\u50cf\uff0c\u5982\u6b64 32 \u6b21\u4ee5\u540e\uff0c\u4e0b\u9762\u7684 32 \u4e2a\u56fe\u50cf\u5c31\u5b8c\u6210\u4e86\u3002<\/p>\n<p style=\"text-align: center;\"><img src=\"http:\/\/home.wangjianshuo.com\/cn\/2020\/09\/picture-18.jpg\"\/><\/p>\n<p style=\"text-align: left;\"><strong>\u6c60\u5316\u5c42<\/strong><\/p>\n<p style=\"text-align: left;\">\u8fd9\u4e9b\u770b\u4e0d\u592a\u6e05\u7684\u56fe\u50cf\u7ee7\u7eed\u7ecf\u8fc7\u4e00\u4e2a\u6c60\u5316\uff0c\u6bcf4\u4e2a\u50cf\u7d20\u5408\u5e76\u6210\u4e00\u4e2a\u50cf\u7d20\uff0c\u76f4\u89c2\u611f\u89c9\u5c31\u662f\u5728\u4e00\u4e2a\u4e0d\u662f\u5f88\u6e05\u695a\u7684\u56fe\u50cf\u4e0a\u9762\u7ee7\u7eed\u6253\u4e86\u9a6c\u8d5b\u514b\u3002<\/p>\n<p style=\"text-align: left;\"><img src=\"http:\/\/home.wangjianshuo.com\/cn\/2020\/09\/picture-19.jpg\"\/><\/p>\n<p style=\"text-align: left;\">\u6253\u9a6c\u8d5b\u514b\u7684\u4f5c\u7528\u5c31\u662f\u4e3a\u4e86\u51cf\u5c0f\u4e0b\u4e00\u5c42\u7684\u8d1f\u62c5\u3002\u5b9e\u8df5\u8bc1\u660e\uff0c\u6253\u4e86\u9a6c\u8d5b\u514b\u548c\u4e0d\u6253\u9a6c\u8d5b\u514b\uff0c\u5bf9\u4e8e\u51c6\u786e\u7387\u51e0\u4e4e\u6ca1\u6709\u5f71\u54cd\u3002<\/p>\n<section class=\"code-snippet__fix code-snippet__js\">\n<ul class=\"code-snippet__line-index code-snippet__js\">\n<li><\/li>\n<\/ul>\n<pre class=\"code-snippet__js\" data-lang=\"cs\"><code><span class=\"code-snippet_outer\">model.<span class=\"code-snippet__keyword\">add<\/span>(MaxPooling2D(pool_size=(<span class=\"code-snippet__number\">2<\/span>,\u00a0<span class=\"code-snippet__number\">2<\/span>)))<\/span><\/code><\/pre>\n<\/section>\n<p style=\"text-align: left;\">\u5927\u5bb6\u53ef\u4ee5\u8bd5\u9a8c\u4e00\u4e0b\uff0c\u5c31\u7b97\u662f\u628apool_size\u589e\u52a0\u5230\uff088\uff0c8\uff09\uff0c\u4e5f\u5c31\u662f\u516b\u516b\u516d\u5341\u56db\u4e2a\u70b9\u7f29\u6210\u4e00\u4e2a\u70b9\uff0c\u4e0b\u4e00\u5c42\u4e5f\u57fa\u672c\u4e0a\u53ef\u4ee5\u8fbe\u523098%\u7684\u51c6\u786e\u7387\u3002\u8fd9\u5c31\u597d\u6bd4\u7ed9\u4f60 4K \u9ad8\u6e05\u5927\u56fe\uff0c\u8fd8\u662f\u8fd9\u79cd 28 x 28 \u7684\u6a21\u6a21\u7cca\u7cca\u7684\u56fe\uff0c\u4f60\u5bf9\u6570\u5b57\u7684\u8bc6\u522b\u7387\u90fd\u5dee\u4e0d\u591a\u3002<\/p>\n<p style=\"text-align: left;\"><strong>\u538b\u5e73\u5c42<\/strong><\/p>\n<section class=\"code-snippet__fix code-snippet__js\">\n<ul class=\"code-snippet__line-index code-snippet__js\">\n<li><\/li>\n<\/ul>\n<pre class=\"code-snippet__js\" data-lang=\"cs\"><code><span class=\"code-snippet_outer\">model.<span class=\"code-snippet__keyword\">add<\/span>(Flatten())<\/span><\/code><\/pre>\n<\/section>\n<p>\u7ecf\u8fc7\u8fd9\u4e2a\u7b80\u5355\u7684\u538b\u5e73\uff0c\u5982\u4e0b\u5c31\u662f\u6700\u7ec8\u51c6\u5907\u7ed9\u5206\u7c7b\u5668\u770b\u7684\u6570\u636e\u4e86\u3002\u8fd9\u662f\u4e00\u4e2a \u57285408 \u4e2a\u7ef4\u5ea6\u7684\u7279\u5f81\u503c\u7684\u67f1\u72b6\u56fe\u3002\u8fd9\u4e2a\u50cf\u4e0d\u50cf\u4e00\u4e2a\u5316\u5b66\u5206\u6790\u62a5\u544a\uff1f<\/p>\n<p><img src=\"http:\/\/home.wangjianshuo.com\/cn\/2020\/09\/picture-20.jpg\"\/><\/p>\n<p>\u6211\u89c9\u5f97\u8fd9\u4e2a\u7ed3\u679c\u7279\u522b\u50cf\u6211\u62ff\u5230\u7684\u9a8c\u8840\u62a5\u544a\u3002\u8fd9\u4e2a\u62a5\u544a\u6307\u51fa\u4e86\u6211\u5728\u4e00\u4e9b\u6307\u6807\u4e0a\u5f02\u5e38\uff0c\u81f3\u4e8e\u8fd9\u4e9b\u5f02\u5e38\u4ee3\u8868\u7740\u4ec0\u4e48\uff0c\u6211\u4e00\u8138\u8ff7\u832b\uff0c\u4f46\u662f\u5bf9\u4e8e\u7ecf\u9a8c\u4e30\u5bcc\u7684\u533b\u751f\u6765\u8bf4\uff0c\u4ed6\u4eec\u53ef\u80fd\u4e00\u773c\u5c31\u53ef\u4ee5\u770b\u51fa\u6765\uff0c\u6211\u5f97\u7684\u662f\u4ec0\u4e48\u75c5\u3002\u6bd4\u5982\u4ed6\u770b\u5230\u5982\u679c\u767d\u8840\u7403\u6c34\u5e73\u504f\u9ad8\uff0c\u540c\u65f6D-\u4e8c\u805a\u4f53\u5347\u9ad8\uff0c\u5728\u968f\u4fbf\u770b\u51e0\u4e2a\u76f8\u5173\u7684\u6307\u6807\uff0c\u7acb\u523b\u5c31\u77e5\u9053\u8fd9\u662f\u8840\u6813\u7684\u7279\u5f81\u3002\u800c\u8fd9\u4e9b\u77e5\u8bc6\uff0c\u662f\u533b\u751f\u770b\u4e86\u51e0\u5343\u4e2a\u75c5\u4f8b\uff0c\u8ba1\u7b97\u673a\u770b\u4e8660000\u591a\u4e2a\u75c5\u4f8b\uff0c\u4ee5\u540e\u6162\u6162\u5b66\u4f1a\u7684\u3002<\/p>\n<p><strong>\u5168\u8fde\u63a5\u5c42<\/strong><\/p>\n<section class=\"code-snippet__fix code-snippet__js\">\n<ul class=\"code-snippet__line-index code-snippet__js\">\n<li><\/li>\n<\/ul>\n<pre class=\"code-snippet__js\" data-lang=\"cs\"><code><span class=\"code-snippet_outer\">model.<span class=\"code-snippet__keyword\">add<\/span>(Dense(<span class=\"code-snippet__number\">10<\/span>,\u00a0activation=<span class=\"code-snippet__string\">'softmax'<\/span>))<\/span><\/code><\/pre>\n<\/section>\n<p>\u7ec8\u4e8e\u5230\u4e86\u63ed\u6653\u8c1c\u5e95\u7684\u65f6\u5019\u4e86\u3002\u7ecf\u8fc7\u4e00\u4e2a\u5168\u8fde\u63a5\u5c42\uff0c\u5982\u4e0a\u7684\u9a8c\u8840\u62a5\u544a\u5c31\u5f97\u51fa\u4e86\u786e\u5b9a\u7684\u7b54\u6848\u3002\u5728 0 &#8211; 9 \u7684 10\u00a0\u79cd\u53ef\u80fd\u91cc\u9762\uff0c\u8ba1\u7b97\u673a\u6beb\u4e0d\u72b9\u8c6b\u7684\u7ed9\u4e86 1 \u51e0\u4e4e100% \u7684\u6295\u7968\uff0c\u800c\u5176\u4ed6\u7684\u53ef\u80fd\u6027\u5b83\u8ba4\u4e3a\u63a5\u8fd1\u4e3a 0 \u3002<\/p>\n<p><img src=\"http:\/\/home.wangjianshuo.com\/cn\/2020\/09\/picture-21.jpg\"\/><\/p>\n<p>\u5982\u4e0b\u662f\u6253\u5370\u51fa\u6765\u7684\u8ba1\u7b97\u673a\u8ba4\u4e3a\u7684\u53ef\u80fd\u6027\u3002\u548c\u5b83\u6700\u63a5\u8fd1\u7684\u7b2c\u4e8c\u540d 4 \u7684\u53ef\u80fd\u6027\u5df2\u7ecf\u9aa4\u964d\u5230\u4e86 1.69 x 10\u00a0\u7684-26\u6b21\u65b9\uff0c\u4e5f\u5c31\u662f<\/p>\n<p>0.0000000000000000000000000169\u00a0<\/p>\n<p>\u5176\u4ed6\u7684\u9009\u9879\u6bd4\u8fd9\u66f4\u4f4e\u3002\u770b\u8d77\u6765\u8ba1\u7b97\u673a\u8fd8\u633a\u81ea\u4fe1\u7684\u5462\u3002<\/p>\n<section class=\"code-snippet__fix code-snippet__js\">\n<ul class=\"code-snippet__line-index code-snippet__js\">\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<\/ul>\n<pre class=\"code-snippet__js\" data-lang=\"json\"><code><span class=\"code-snippet_outer\">[<\/span><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__number\">0.0000000e+00<\/span><\/span><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__number\">1.0000000e+00<\/span> <\/span><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__number\">0.0000000e+00<\/span> <\/span><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__number\">3.3420391e-30<\/span> <\/span><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__number\">1.6909421e-26<\/span><\/span><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__number\">7.0893234e-33<\/span> <\/span><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__number\">0.0000000e+00<\/span> <\/span><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__number\">0.0000000e+00<\/span> <\/span><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__number\">5.1055432e-27<\/span> <\/span><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__number\">3.4242518e-33<\/span><\/span><\/code><code><span class=\"code-snippet_outer\">]<\/span><\/code><\/pre>\n<\/section>\n<p><strong>\u533b\u751f\u7684\u6bd4\u55bb<\/strong><\/p>\n<p>\u6216\u8bb8\u7528\u6bd4\u55bb\u662f\u6700\u597d\u7406\u89e3\u4e00\u6837\u4e8b\u7269\uff08\u867d\u7136\u5fc5\u7136\u4f1a\u6709\u4e00\u4e9b\u504f\u5dee\uff09\u3002\u6211\u4eec\u5c31\u7528\u4e00\u4e2a\u533b\u751f\u6765\u6bd4\u55bb\u4eba\u5de5\u667a\u80fd\u7684\u7b97\u6cd5\u597d\u4e86\u3002<\/p>\n<p>\u539f\u6765\u4eba\u5de5\u667a\u80fd\u53d1\u5c55\u7f13\u6162\u7684\u539f\u56e0\uff0c\u5c31\u597d\u50cf\u62bd\u4e86\u4e00\u7ba1\u8840\uff0c\u7136\u540e\u4ea4\u7ed9\u533b\u751f\u8bf4\uff1a\u5e2e\u6211\u770b\u770b\uff0c\u6211\u5f97\u4e86\u4ec0\u4e48\u75c5\u3002\u533b\u751f\u53ea\u80fd\u901a\u8fc7\u8840\u7684\u989c\u8272\uff0c\u9ecf\u7a20\u5ea6\u7b49\u8868\u9762\u7684\u4fe1\u606f\u53bb\u5224\u65ad\uff0c\u5f53\u7136\u51c6\u786e\u5ea6\u975e\u5e38\u4f4e\u3002<\/p>\n<p>\u5f53\u6709\u4e86\u5377\u79ef\u795e\u7ecf\u7f51\u7edc\u7684\u60f3\u6cd5\u4ee5\u540e\uff0c\u95ee\u9898\u4e00\u4e0b\u5b50\u5c31\u53d8\u5f97\u7b80\u5355\u4e86\u3002\u533b\u751f\u624b\u91cc\u9762\u51fa\u73b0\u4e86\u51e0\u5341\u79cd\u4e0d\u540c\u7684\u201cfilter\u201d\uff0c\u53ef\u4ee5\u5bf9\u8840\u6db2\u8fdb\u884c\u5206\u6790\u4e86\u3002<\/p>\n<p>\u6bd4\u5982\u4e00\u4e2a 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