{"id":3339,"date":"2025-08-29T09:05:54","date_gmt":"2025-08-29T01:05:54","guid":{"rendered":"https:\/\/www.leexinghai.com\/aic\/?p=3339"},"modified":"2025-08-29T09:19:17","modified_gmt":"2025-08-29T01:19:17","slug":"4-3%e5%8d%b7%e7%a7%af%e7%a5%9e%e7%bb%8f%e7%bd%91%e7%bb%9calexnet","status":"publish","type":"post","link":"https:\/\/www.leexinghai.com\/aic\/4-3%e5%8d%b7%e7%a7%af%e7%a5%9e%e7%bb%8f%e7%bd%91%e7%bb%9calexnet\/","title":{"rendered":"4.3\u5377\u79ef\u795e\u7ecf\u7f51\u7edcALEXNET"},"content":{"rendered":"\n<p>ALEXNET\u76f8\u5bf9\u4e8eLeNet\uff0c\u505a\u51fa\u4e86\u4e94\u4e2a\u6539\u8fdb\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>ReLu\u51fd\u6570<\/li>\n\n\n\n<li>\u6700\u5927\u6c60\u5316<\/li>\n\n\n\n<li>\u968f\u673a\u4e22\u5f03<\/li>\n\n\n\n<li>\u6570\u636e\u6269\u589e<\/li>\n\n\n\n<li>GPU\u5e76\u884c\u8bad\u7ec3<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"899\" height=\"621\" src=\"https:\/\/www.leexinghai.com\/aic\/wp-content\/uploads\/2025\/08\/image-73.png\" alt=\"\" class=\"wp-image-3340\" srcset=\"https:\/\/www.leexinghai.com\/aic\/wp-content\/uploads\/2025\/08\/image-73.png 899w, https:\/\/www.leexinghai.com\/aic\/wp-content\/uploads\/2025\/08\/image-73-300x207.png 300w, https:\/\/www.leexinghai.com\/aic\/wp-content\/uploads\/2025\/08\/image-73-768x531.png 768w\" sizes=\"auto, (max-width: 899px) 100vw, 899px\" \/><\/figure>\n\n\n\n<p>\u9996\u5148\uff0c\u6211\u4eec\u6765\u770b\u770b\u4ec0\u4e48\u662fALEXNET\uff1a<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. AlexNet \u7684\u57fa\u672c\u60c5\u51b5<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f5c\u8005<\/strong>\uff1aAlex Krizhevsky\u3001Ilya Sutskever\uff08Hinton \u7684\u5b66\u751f\u4eec\uff09<\/li>\n\n\n\n<li><strong>\u63d0\u51fa\u65f6\u95f4<\/strong>\uff1a2012 \u5e74<\/li>\n\n\n\n<li><strong>\u6570\u636e\u96c6<\/strong>\uff1aImageNet\uff08120 \u4e07\u5f20\u56fe\u50cf\uff0c1000 \u4e2a\u7c7b\u522b\uff09<\/li>\n\n\n\n<li><strong>\u89c4\u6a21<\/strong>\uff1a\u7ea6 650,000 \u4e2a\u795e\u7ecf\u5143\u30016000 \u4e07\u53c2\u6570\u30016500 \u4e07\u8fde\u63a5<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. \u7f51\u7edc\u7ed3\u6784\uff08\u5178\u578b\u7248\uff09<\/h2>\n\n\n\n<p>\u8f93\u5165\u662f 227\u00d7227\u00d73\u5f69\u8272\u56fe\u50cf\uff0c\u7f51\u7edc\u5305\u542b <strong>8 \u5c42\u53ef\u8bad\u7ec3\u7684\u5c42<\/strong>\uff085 \u4e2a\u5377\u79ef\u5c42 + 3 \u4e2a\u5168\u8fde\u63a5\u5c42\uff09\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Conv1<\/strong>\uff1a96 \u4e2a 11\u00d711 \u5377\u79ef\u6838\uff0cstride=4 \u2192 \u8f93\u51fa 55\u00d755\u00d796<\/li>\n\n\n\n<li><strong>Max Pooling<\/strong>\uff1a3\u00d73, stride=2 \u2192 27\u00d727\u00d796<\/li>\n\n\n\n<li><strong>Conv2<\/strong>\uff1a256 \u4e2a 5\u00d75 \u5377\u79ef\u6838 \u2192 27\u00d727\u00d7256<\/li>\n\n\n\n<li><strong>Max Pooling<\/strong>\uff1a3\u00d73, stride=2 \u2192 13\u00d713\u00d7256<\/li>\n\n\n\n<li><strong>Conv3<\/strong>\uff1a384 \u4e2a 3\u00d73 \u5377\u79ef\u6838 \u2192 13\u00d713\u00d7384<\/li>\n\n\n\n<li><strong>Conv4<\/strong>\uff1a384 \u4e2a 3\u00d73\u5377\u79ef\u6838 \u2192 13\u00d713\u00d7384<\/li>\n\n\n\n<li><strong>Conv5<\/strong>\uff1a256 \u4e2a 3\u00d73\u5377\u79ef\u6838 \u2192 13\u00d713\u00d7256<\/li>\n\n\n\n<li><strong>Max Pooling<\/strong>\uff1a3\u00d73, stride=2 \u2192 6\u00d76\u00d7256<\/li>\n\n\n\n<li><strong>FC1<\/strong>\uff1a\u5168\u8fde\u63a5\u5c42\uff0c4096 \u4e2a\u795e\u7ecf\u5143<\/li>\n\n\n\n<li><strong>FC2<\/strong>\uff1a\u5168\u8fde\u63a5\u5c42\uff0c4096 \u4e2a\u795e\u7ecf\u5143<\/li>\n\n\n\n<li><strong>FC3<\/strong>\uff1a\u5168\u8fde\u63a5\u5c42\uff0c1000 \u4e2a\u795e\u7ecf\u5143\uff08\u5bf9\u5e94 1000 \u4e2a\u7c7b\u522b\uff0cSoftmax \u8f93\u51fa\uff09<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. AlexNet \u7684\u5173\u952e\u521b\u65b0<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f7f\u7528 ReLU \u6fc0\u6d3b\u51fd\u6570<\/strong>\uff08\u4ee3\u66ff\u4f20\u7edf\u7684 Sigmoid\/Tanh\uff0c\u52a0\u5feb\u6536\u655b\u901f\u5ea6\uff09\u3002<\/li>\n\n\n\n<li><strong>\u4f7f\u7528 Dropout<\/strong>\uff08\u968f\u673a\u4e22\u5f03\u795e\u7ecf\u5143\uff0c\u9632\u6b62\u8fc7\u62df\u5408\uff09\u3002<\/li>\n\n\n\n<li><strong>\u6570\u636e\u589e\u5f3a<\/strong>\uff08\u56fe\u50cf\u5e73\u79fb\u3001\u7ffb\u8f6c\u3001\u989c\u8272\u6270\u52a8\uff0c\u6269\u5927\u8bad\u7ec3\u96c6\u6709\u6548\u89c4\u6a21\uff09\u3002<\/li>\n\n\n\n<li><strong>GPU \u5e76\u884c\u8bad\u7ec3<\/strong>\uff08\u9996\u6b21\u628a GPU \u5f15\u5165\u5927\u89c4\u6a21\u5377\u79ef\u795e\u7ecf\u7f51\u7edc\u8bad\u7ec3\uff0c\u5927\u5927\u63d0\u9ad8\u8bad\u7ec3\u901f\u5ea6\uff09\u3002<\/li>\n\n\n\n<li><strong>\u6700\u5927\u6c60\u5316<\/strong>\uff08\u7a81\u51fa\u6700\u663e\u8457\u7684\u7279\u5f81\uff0c\u5bf9\u80cc\u666f\u566a\u58f0\u66f4\u9c81\u68d2\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. \u5f71\u54cd<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5728 2012 ILSVRC \u6bd4\u8d5b\u4e2d\uff0cTop-5 \u9519\u8bef\u7387\u4ec5 15.3%\uff0c\u800c\u7b2c\u4e8c\u540d\u662f 26.2%\uff0c\u5dee\u8ddd\u975e\u5e38\u5927\u3002<\/li>\n\n\n\n<li>AlexNet \u7684\u6210\u529f\u8ba9\u4e1a\u754c\u8ba4\u8bc6\u5230\uff1a<strong>\u6df1\u5ea6\u5377\u79ef\u795e\u7ecf\u7f51\u7edc\u5728\u5927\u89c4\u6a21\u6570\u636e\u548c GPU \u52a0\u901f\u4e0b\uff0c\u80fd\u8fdc\u8d85\u4f20\u7edf\u65b9\u6cd5<\/strong>\u3002<\/li>\n\n\n\n<li>\u540e\u7eed\u7684 VGG\u3001GoogLeNet\u3001ResNet \u90fd\u662f\u5728 AlexNet \u7684\u57fa\u7840\u4e0a\u53d1\u5c55\u8d77\u6765\u7684\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<p>\u63a5\u4e0b\u6765\u8ba9\u6211\u4eec\u5206\u522b\u770b\u770b\u6bcf\u4e00\u4e2a\u521b\u65b0\u70b9<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center\">1.ReLu\u51fd\u6570<\/h2>\n\n\n\n<p>\u5728 <strong>AlexNet<\/strong> \u91cc\u7528\u7684 <strong>ReLU\uff08Rectified Linear Unit\uff0c\u4fee\u6b63\u7ebf\u6027\u5355\u5143\uff09<\/strong>\uff0c\u662f\u5b83\u6700\u91cd\u8981\u7684\u521b\u65b0\u4e4b\u4e00\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u4f20\u7edf\u6fc0\u6d3b\u51fd\u6570\u7684\u95ee\u9898<\/h3>\n\n\n\n<p>\u5728 AlexNet \u4e4b\u524d\uff0c\u5e38\u89c1\u7684\u975e\u7ebf\u6027\u6fc0\u6d3b\u51fd\u6570\u662f <strong>Sigmoid<\/strong> \u548c <strong>tanh<\/strong>\uff1a<\/p>\n\n\n\n<p><strong>Sigmoid<\/strong>\uff1a<\/p>\n\n\n\n<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mi>\u03c3<\/mi><mo stretchy=\"false\">(<\/mo><mi>x<\/mi><mo stretchy=\"false\">)<\/mo><mo>=<\/mo><mfrac><mn>1<\/mn><mrow><mn>1<\/mn><mo>+<\/mo><msup><mi>e<\/mi><mrow><mo>\u2212<\/mo><mi>x<\/mi><\/mrow><\/msup><\/mrow><\/mfrac><\/math>\n\n\n\n<p>\uff0c\u8f93\u51fa\u5728(0,1) \u4e4b\u95f4<\/p>\n\n\n\n<p><strong>tanh<\/strong>\uff1a<\/p>\n\n\n\n<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mi>tanh<\/mi><mo data-mjx-texclass=\"NONE\">\u2061<\/mo><mo stretchy=\"false\">(<\/mo><mi>x<\/mi><mo stretchy=\"false\">)<\/mo><mo>=<\/mo><mfrac><mrow><msup><mi>e<\/mi><mi>x<\/mi><\/msup><mo>\u2212<\/mo><msup><mi>e<\/mi><mrow><mo>\u2212<\/mo><mi>x<\/mi><\/mrow><\/msup><\/mrow><mrow><msup><mi>e<\/mi><mi>x<\/mi><\/msup><mo>+<\/mo><msup><mi>e<\/mi><mrow><mo>\u2212<\/mo><mi>x<\/mi><\/mrow><\/msup><\/mrow><\/mfrac><\/math>\n\n\n\n<p>\uff0c\u8f93\u51fa\u5728 (\u22121,1)\u4e4b\u95f4<\/p>\n\n\n\n<p>\u8fd9\u4e24\u79cd\u51fd\u6570\u7684\u4e3b\u8981\u7f3a\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u8ba1\u7b97\u590d\u6742<\/strong>\uff1a\u6d89\u53ca\u6307\u6570\u8fd0\u7b97\uff0c\u65e9\u671f\u8ba1\u7b97\u8d44\u6e90\u6709\u9650\uff0c\u6548\u7387\u4e0d\u9ad8\u3002<\/li>\n\n\n\n<li><strong>\u68af\u5ea6\u6d88\u5931<\/strong>\uff1a\u5728\u8f93\u5165\u5f88\u5927\u6216\u5f88\u5c0f\u65f6\uff0c\u51fd\u6570\u4f1a\u9971\u548c\uff08\u8d8b\u8fd1\u4e8e\u5e38\u6570\uff09\uff0c\u5bfc\u6570\u63a5\u8fd1 0\uff0c\u5bfc\u81f4\u68af\u5ea6\u51e0\u4e4e\u4f20\u4e0d\u4e0b\u53bb \u2192 \u6df1\u5c42\u7f51\u7edc\u96be\u4ee5\u8bad\u7ec3\u3002<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. ReLU \u7684\u5b9a\u4e49<\/h3>\n\n\n\n<p>f(x)=max\u2061(0,x)<\/p>\n\n\n\n<p>\u975e\u5e38\u7b80\u5355\uff1a\u5c0f\u4e8e 0 \u7684\u76f4\u63a5\u53d8\u6210 0\uff0c\u5927\u4e8e 0 \u7684\u4fdd\u6301\u539f\u503c\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. ReLU \u7684\u4f18\u70b9<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u8ba1\u7b97\u9ad8\u6548<\/strong>\uff1a\u53ea\u9700\u6bd4\u8f83\u548c\u622a\u65ad\uff0c\u6bd4 sigmoid\/tanh \u5feb\u5f97\u591a\u3002<\/li>\n\n\n\n<li><strong>\u7f13\u89e3\u68af\u5ea6\u6d88\u5931<\/strong>\uff1a\u5728 x&gt;0 \u533a\u57df\uff0c\u68af\u5ea6\u6052\u4e3a 1\uff0c\u53ef\u4ee5\u628a\u8bef\u5dee\u6709\u6548\u4f20\u9012\u5230\u6df1\u5c42\u3002<\/li>\n\n\n\n<li><strong>\u7a00\u758f\u6fc0\u6d3b<\/strong>\uff1a\u5f53 x&lt;0 \u65f6\u8f93\u51fa 0\uff0c\u5f88\u591a\u795e\u7ecf\u5143\u4e0d\u6fc0\u6d3b\uff0c\u4f7f\u7f51\u7edc\u7a00\u758f\u5316\uff0c\u51cf\u5c11\u53c2\u6570\u4f9d\u8d56\uff0c\u63d0\u9ad8\u6cdb\u5316\u80fd\u529b\u3002<\/li>\n\n\n\n<li><strong>\u6536\u655b\u901f\u5ea6\u5feb<\/strong>\uff1a\u5728 AlexNet \u7684\u5b9e\u9a8c\u91cc\uff0cReLU \u7f51\u7edc\u7684\u6536\u655b\u901f\u5ea6\u6bd4 tanh \u5feb 6 \u500d\u4ee5\u4e0a\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. ReLU \u7684\u5c0f\u95ee\u9898\u4e0e\u53d8\u79cd<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u201c\u795e\u7ecf\u5143\u6b7b\u4ea1\u201d<\/strong>\uff1a\u5982\u679c\u67d0\u4e2a\u795e\u7ecf\u5143\u957f\u671f\u8f93\u5165\u4e3a\u8d1f\uff0c\u5c31\u4e00\u76f4\u8f93\u51fa 0\uff0c\u4e0d\u518d\u66f4\u65b0\u3002<\/li>\n\n\n\n<li>\u89e3\u51b3\u529e\u6cd5\uff1a\u51fa\u73b0\u4e86 <strong>Leaky ReLU\u3001Parametric ReLU\u3001ELU<\/strong> \u7b49\u53d8\u4f53\uff0c\u5728\u8d1f\u534a\u8f74\u7ed9\u4e00\u4e2a\u5c0f\u659c\u7387\uff0c\u800c\u4e0d\u662f\u5b8c\u5168\u4e3a 0\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center\">2.\u6700\u5927\u6c60\u5316MaxPooling<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u4ec0\u4e48\u662f\u6c60\u5316\uff1f<\/h3>\n\n\n\n<p>\u6c60\u5316\u5c31\u662f\u5728 <strong>\u7279\u5f81\u56fe\u7684\u5c40\u90e8\u533a\u57df<\/strong> \u5185\uff0c\u6309\u7167\u67d0\u79cd\u89c4\u5219\u628a\u591a\u4e2a\u50cf\u7d20\u201c\u805a\u5408\u201d\u4e3a\u4e00\u4e2a\u503c\uff0c\u4ece\u800c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7f29\u5c0f\u7279\u5f81\u56fe\u5c3a\u5bf8<\/strong>\uff08\u964d\u91c7\u6837\uff09<\/li>\n\n\n\n<li><strong>\u51cf\u5c11\u8ba1\u7b97\u91cf<\/strong><\/li>\n\n\n\n<li><strong>\u589e\u5f3a\u6a21\u578b\u5bf9\u5e73\u79fb\u548c\u5c40\u90e8\u53d8\u5316\u7684\u9c81\u68d2\u6027<\/strong><\/li>\n<\/ul>\n\n\n\n<p>\u7b80\u5355\u7406\u89e3\u5c31\u662f\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u628a\u90bb\u8fd1\u50cf\u7d20\u770b\u4f5c\u4e00\u4e2a\u201c\u5c0f\u6c60\u5b50\u201d\uff0c\u7136\u540e\u7528\u6c60\u5316\u51fd\u6570\uff08\u5982\u53d6\u6700\u5927\u503c\/\u5e73\u5747\u503c\uff09\u6765\u4ee3\u8868\u8fd9\u4e00\u7247\u533a\u57df\u3002<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u5e38\u89c1\u6c60\u5316\u65b9\u6cd5<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">(1) <strong>\u5e73\u5747\u6c60\u5316 (Average Pooling)<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8f93\u51fa = \u7a97\u53e3\u5185\u6240\u6709\u50cf\u7d20\u7684\u5e73\u5747\u503c<\/li>\n\n\n\n<li>LeNet-5 \u4f7f\u7528\u7684\u5c31\u662f\u8fd9\u79cd\u65b9\u5f0f<\/li>\n\n\n\n<li>\u7279\u70b9\uff1a\u4fdd\u7559\u6574\u4f53\u8d8b\u52bf\uff0c\u4f46\u7ec6\u8282\u5bb9\u6613\u88ab\u201c\u51b2\u6de1\u201d<\/li>\n<\/ul>\n\n\n\n<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mi>y<\/mi><mo>=<\/mo><mfrac><mn>1<\/mn><msup><mi>k<\/mi><mn>2<\/mn><\/msup><\/mfrac><munderover><mo data-mjx-texclass=\"OP\">\u2211<\/mo><mrow><mi>i<\/mi><mo>=<\/mo><mn>1<\/mn><\/mrow><mrow><mi>k<\/mi><\/mrow><\/munderover><munderover><mo data-mjx-texclass=\"OP\">\u2211<\/mo><mrow><mi>j<\/mi><mo>=<\/mo><mn>1<\/mn><\/mrow><mrow><mi>k<\/mi><\/mrow><\/munderover><msub><mi>x<\/mi><mrow><mi>i<\/mi><mi>j<\/mi><\/mrow><\/msub><\/math>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">(2) <strong>\u6700\u5927\u6c60\u5316 (Max Pooling)<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8f93\u51fa = \u7a97\u53e3\u5185\u50cf\u7d20\u7684\u6700\u5927\u503c<\/li>\n\n\n\n<li>AlexNet \u91c7\u7528\u7684\u65b9\u5f0f<\/li>\n\n\n\n<li>\u7279\u70b9\uff1a\u7a81\u51fa\u6700\u663e\u8457\u7684\u7279\u5f81\uff08\u5982\u8fb9\u7f18\u3001\u89d2\u70b9\uff09\uff0c\u5bf9\u80cc\u666f\u566a\u58f0\u66f4\u9c81\u68d2<\/li>\n<\/ul>\n\n\n\n<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mi>y<\/mi><mo>=<\/mo><munder><mo data-mjx-texclass=\"OP\" movablelimits=\"true\">max<\/mo><mrow><mo stretchy=\"false\">(<\/mo><mi>i<\/mi><mo>,<\/mo><mi>j<\/mi><mo stretchy=\"false\">)<\/mo><mo>\u2208<\/mo><mtext>window<\/mtext><\/mrow><\/munder><msub><mi>x<\/mi><mrow><mi>i<\/mi><mi>j<\/mi><\/mrow><\/msub><\/math>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">(3) <strong>\u5168\u5c40\u5e73\u5747\u6c60\u5316 (Global Average Pooling, GAP)<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5bf9\u6574\u4e2a\u7279\u5f81\u56fe\u53d6\u5e73\u5747\uff0c\u5f97\u5230\u5355\u4e2a\u6570\u503c<\/li>\n\n\n\n<li>GoogLeNet \u5f00\u59cb\u6d41\u884c\uff0c\u7528\u4e8e\u4ee3\u66ff\u5168\u8fde\u63a5\u5c42\uff0c\u51cf\u5c11\u53c2\u6570<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u6c60\u5316\u7684\u4f5c\u7528<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u964d\u91c7\u6837<\/strong>\uff1a\u51cf\u5c11\u7279\u5f81\u56fe\u5927\u5c0f\u548c\u53c2\u6570\u91cf<\/li>\n\n\n\n<li><strong>\u5e73\u79fb\u4e0d\u53d8\u6027<\/strong>\uff1a\u5373\u4f7f\u76ee\u6807\u5728\u56fe\u50cf\u91cc\u7a0d\u5fae\u79fb\u52a8\uff0c\u6c60\u5316\u540e\u7684\u7279\u5f81\u53d8\u5316\u4e0d\u5927<\/li>\n\n\n\n<li><strong>\u6291\u5236\u566a\u58f0<\/strong>\uff1a\u5c24\u5176\u662f\u6700\u5927\u6c60\u5316\uff0c\u80fd\u5ffd\u7565\u5f31\u7279\u5f81\uff0c\u5f3a\u5316\u663e\u8457\u7279\u5f81<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. LeNet vs AlexNet \u7684\u5bf9\u6bd4<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>LeNet (1998)<\/strong>\uff1a\u7528 <strong>\u5e73\u5747\u6c60\u5316 (average pooling)<\/strong>\uff0c\u66f4\u504f\u201c\u5e73\u6ed1\u201d<\/li>\n\n\n\n<li><strong>AlexNet (2012)<\/strong>\uff1a\u6539\u7528 <strong>\u6700\u5927\u6c60\u5316 (max pooling)<\/strong>\uff0c\u4fdd\u7559\u4e86\u66f4\u5f3a\u7684\u8fb9\u7f18\u548c\u7eb9\u7406\u7279\u5f81\uff0c\u8bc6\u522b\u6548\u679c\u663e\u8457\u63d0\u5347\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center\">3.\u968f\u673a\u4e22\u5f03Dropout<\/h2>\n\n\n\n<p><strong>Dropout\uff08\u968f\u673a\u5931\u6d3b\/\u968f\u673a\u4e22\u5f03\uff09<\/strong> \u662f AlexNet \u4e2d\u9996\u6b21\u5927\u89c4\u6a21\u5e94\u7528\u7684\u4e00\u79cd\u6b63\u5219\u5316\u65b9\u6cd5\uff0c\u63d0\u51fa\u7684\u52a8\u673a\u662f\u4e3a\u4e86\u7f13\u89e3\u6df1\u5ea6\u795e\u7ecf\u7f51\u7edc\u5bb9\u6613\u51fa\u73b0\u7684 <strong>\u8fc7\u62df\u5408<\/strong> \u95ee\u9898\u3002\u5b83\u7684\u505a\u6cd5\u5f88\u76f4\u89c2\uff1a\u5728\u8bad\u7ec3\u8fc7\u7a0b\u4e2d\uff0c\u6309\u7167\u4e00\u5b9a\u6982\u7387 p\uff08\u901a\u5e38\u53d6 0.5\uff09\u968f\u673a\u201c\u4e22\u5f03\u201d\u90e8\u5206\u795e\u7ecf\u5143\u53ca\u5176\u8fde\u63a5\uff0c\u4e0d\u8ba9\u5b83\u4eec\u53c2\u4e0e\u672c\u6b21\u524d\u5411\u4f20\u64ad\u548c\u53cd\u5411\u4f20\u64ad\uff0c\u76f8\u5f53\u4e8e\u4e34\u65f6\u628a\u8fd9\u4e9b\u795e\u7ecf\u5143\u5c4f\u853d\u6389\u3002\u8fd9\u6837\u6bcf\u4e00\u6b21\u8bad\u7ec3\u8fed\u4ee3\u65f6\uff0c\u7f51\u7edc\u7ed3\u6784\u90fd\u4e0d\u5b8c\u5168\u4e00\u6837\uff0c\u66f4\u50cf\u662f\u8bad\u7ec3\u4e86\u5f88\u591a\u4e0d\u540c\u7684\u5b50\u7f51\u7edc\u3002\u7531\u4e8e\u8fd9\u4e9b\u5b50\u7f51\u7edc\u5171\u4eab\u6743\u91cd\uff0c\u6700\u540e\u6574\u4f53\u6548\u679c\u76f8\u5f53\u4e8e\u5728\u505a\u4e00\u79cd\u201c\u6a21\u578b\u96c6\u6210\u201d\uff0c\u80fd\u663e\u8457\u63d0\u9ad8\u7f51\u7edc\u7684\u6cdb\u5316\u80fd\u529b\u3002<\/p>\n\n\n\n<p>\u5728\u5b9e\u9645\u5b9e\u73b0\u65f6\uff0cDropout \u53ea\u5728\u8bad\u7ec3\u9636\u6bb5\u8d77\u4f5c\u7528\uff0c\u6d4b\u8bd5\u9636\u6bb5\u5219\u6062\u590d\u6240\u6709\u795e\u7ecf\u5143\uff0c\u4f46\u4f1a\u628a\u6743\u91cd\u6309\u4e22\u5f03\u6982\u7387\u7f29\u653e\uff0c\u4f7f\u5f97\u8f93\u51fa\u7684\u671f\u671b\u4fdd\u6301\u4e00\u81f4\u3002AlexNet \u6b63\u662f\u56e0\u4e3a\u91c7\u7528\u4e86 Dropout\uff0c\u6709\u6548\u7f13\u89e3\u4e86\u5f53\u65f6\u8bad\u7ec3\u5927\u89c4\u6a21\u7f51\u7edc\u65f6\u4e25\u91cd\u7684\u8fc7\u62df\u5408\u95ee\u9898\uff0c\u624d\u80fd\u5728 ImageNet \u4e0a\u53d6\u5f97\u8fdc\u8d85\u4f20\u7edf\u65b9\u6cd5\u7684\u8868\u73b0\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center\">4.\u6570\u636e\u6269\u589eData Augumentation<\/h2>\n\n\n\n<p>AlexNet \u7528\u7684 ImageNet \u6570\u636e\u96c6\u5df2\u7ecf\u6709 120 \u4e07\u5f20\u6807\u6ce8\u56fe\u7247\uff0c\u5728\u5f53\u65f6\u7b97\u662f\u975e\u5e38\u5e9e\u5927\u7684\u8bad\u7ec3\u96c6\u4e86\u3002\u4f46\u5373\u4fbf\u5982\u6b64\uff0c\u8fd9\u6837\u4e00\u4e2a <strong>\u62e5\u6709 6000 \u4e07\u53c2\u6570<\/strong> \u7684\u6df1\u5ea6\u5377\u79ef\u795e\u7ecf\u7f51\u7edc\uff0c\u4f9d\u7136\u5bb9\u6613 <strong>\u8fc7\u62df\u5408<\/strong>\u3002\u539f\u56e0\u6709\u4e24\u4e2a\uff1a<\/p>\n\n\n\n<p><strong>\u7b2c\u4e00\uff0c\u7f51\u7edc\u5bb9\u91cf\u592a\u5927\u3002<\/strong><br>AlexNet \u7684\u53c2\u6570\u89c4\u6a21\u6bd4\u4ee5\u5f80\u7684\u6a21\u578b\u5927\u5f97\u591a\uff0c\u5b83\u6709\u80fd\u529b\u201c\u8bb0\u4f4f\u201d\u8bad\u7ec3\u6570\u636e\u91cc\u7684\u5f88\u591a\u7ec6\u8282\u751a\u81f3\u566a\u58f0\u3002\u5982\u679c\u6ca1\u6709\u66f4\u591a\u6837\u5316\u7684\u6570\u636e\uff0c\u5b83\u5728\u6d4b\u8bd5\u96c6\u4e0a\u5c31\u4f1a\u8868\u73b0\u4e0b\u964d\u3002<\/p>\n\n\n\n<p><strong>\u7b2c\u4e8c\uff0c\u6837\u672c\u5206\u5e03\u4e0d\u591f\u201c\u4e30\u5bcc\u201d\u3002<\/strong><br>\u867d\u7136 ImageNet \u603b\u91cf\u5927\uff0c\u4f46\u5bf9\u6bcf\u4e2a\u7c7b\u522b\u6765\u8bf4\uff0c\u56fe\u7247\u7684\u91c7\u96c6\u573a\u666f\u6709\u9650\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5927\u90e8\u5206\u7167\u7247\u62cd\u6444\u89d2\u5ea6\u7c7b\u4f3c<\/li>\n\n\n\n<li>\u5149\u7167\u6761\u4ef6\u76f8\u5bf9\u5355\u4e00<\/li>\n\n\n\n<li>\u7269\u4f53\u4f4d\u7f6e\u3001\u6bd4\u4f8b\u53d8\u5316\u4e0d\u591f\u591a<\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u4f1a\u5bfc\u81f4\u7f51\u7edc\u5b66\u4e60\u5230\u7684\u7279\u5f81\u504f\u5411\u4e8e\u8fd9\u4e9b\u201c\u8bad\u7ec3\u96c6\u7279\u5b9a\u7684\u5206\u5e03\u201d\uff0c\u6cdb\u5316\u80fd\u529b\u4e0d\u8db3\u3002<\/p>\n\n\n\n<p>\u56e0\u6b64\uff0c\u6570\u636e\u589e\u5f3a\uff08Data Augmentation\uff09\u5c31\u663e\u5f97\u975e\u5e38\u91cd\u8981\u3002AlexNet \u91cc\u91c7\u7528\u7684\u589e\u5f3a\u65b9\u6cd5\u4e3b\u8981\u6709\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u968f\u673a\u88c1\u526a<\/strong>\uff1a\u4ece\u539f\u59cb 256\u00d7256 \u56fe\u50cf\u4e2d\u968f\u673a\u88c1\u51fa 224\u00d7224 \u7684\u533a\u57df\uff0c\u589e\u52a0\u5e73\u79fb\u4e0e\u7f29\u653e\u7684\u53d8\u5316\u3002<\/li>\n\n\n\n<li><strong>\u6c34\u5e73\u7ffb\u8f6c<\/strong>\uff1a\u968f\u673a\u628a\u56fe\u7247\u5de6\u53f3\u7ffb\u8f6c\uff0c\u8ba9\u6a21\u578b\u5b66\u4f1a\u5bf9\u79f0\u6027\u3002<\/li>\n\n\n\n<li><strong>RGB \u901a\u9053\u6270\u52a8<\/strong>\uff1a\u5bf9\u989c\u8272\u505a\u8f7b\u5fae\u53d8\u5316\uff0c\u6a21\u62df\u4e0d\u540c\u5149\u7167\u73af\u5883\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u4e9b\u64cd\u4f5c\u80fd\u5728 <strong>\u4e0d\u589e\u52a0\u4eba\u5de5\u6807\u6ce8\u6210\u672c<\/strong> \u7684\u524d\u63d0\u4e0b\uff0c\u6210\u500d\u5730\u4ea7\u751f\u65b0\u7684\u8bad\u7ec3\u6837\u672c\u3002\u8fd9\u6837\u4e00\u6765\uff0c\u7f51\u7edc\u4e0d\u4ec5\u89c1\u8fc7\u201c\u732b\u7684\u6b63\u9762\u7167\u7247\u201d\uff0c\u4e5f\u89c1\u8fc7\u201c\u732b\u7684\u7ffb\u8f6c\u7167\u7247\u201d\uff1b\u4e0d\u4ec5\u89c1\u8fc7\u201c\u5149\u7ebf\u597d\u7684\u82f9\u679c\u201d\uff0c\u4e5f\u89c1\u8fc7\u201c\u504f\u6697\u7684\u82f9\u679c\u201d\u3002\u6700\u7ec8\u6548\u679c\u5c31\u662f <strong>\u63d0\u5347\u6cdb\u5316\u6027\u80fd\uff0c\u964d\u4f4e\u8fc7\u62df\u5408<\/strong>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center\">5.GPU\u5e76\u884c\u8bad\u7ec3<\/h2>\n\n\n\n<p>\u5728 2012 \u5e74\u7684\u65f6\u5019\uff0c\u6df1\u5ea6\u795e\u7ecf\u7f51\u7edc\u7684\u89c4\u6a21\u5df2\u7ecf\u8fdc\u8fdc\u8d85\u51fa\u4e86\u666e\u901a CPU \u7684\u627f\u8f7d\u80fd\u529b\u3002AlexNet \u5927\u7ea6\u6709 <strong>6000 \u4e07\u53c2\u6570\u30016.5 \u4ebf\u8fde\u63a5<\/strong>\uff0c\u5982\u679c\u5b8c\u5168\u7528 CPU \u8bad\u7ec3\uff0c\u53ef\u80fd\u8981\u51e0\u4e2a\u6708\u751a\u81f3\u66f4\u4e45\uff0c\u51e0\u4e4e\u4e0d\u53ef\u884c\u3002<\/p>\n\n\n\n<p>Alex Krizhevsky \u5f53\u65f6\u91c7\u7528\u4e86 <strong>\u4e24\u5757 NVIDIA GTX 580 GPU\uff08\u6bcf\u5757\u663e\u5b58 3GB\uff09<\/strong> \u6765\u52a0\u901f\u8bad\u7ec3\uff0c\u5e76\u8bbe\u8ba1\u4e86\u4e00\u79cd <strong>\u8de8 GPU \u7684\u5206\u5de5\u673a\u5236<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u901a\u9053\u5207\u5206\uff08channel split\uff09<\/strong>\uff1a\u6bcf\u4e00\u5c42\u7684\u7279\u5f81\u56fe\u901a\u9053\u6570\u88ab <strong>\u5e73\u5747\u5206\u6210\u4e24\u4efd<\/strong>\uff0c\u4e0a\u9762\u4e00\u534a\u5206\u914d\u7ed9 GPU1\uff0c\u4e0b\u9762\u4e00\u534a\u5206\u914d\u7ed9 GPU2\u3002<\/li>\n\n\n\n<li><strong>\u5377\u79ef\u5c40\u90e8\u8ba1\u7b97<\/strong>\uff1a\u5927\u591a\u6570\u5377\u79ef\u64cd\u4f5c\u53ea\u5728\u201c\u672c GPU \u7684\u901a\u9053\u5b50\u96c6\u201d\u4e0a\u5b8c\u6210\uff0c\u51cf\u5c11\u8de8\u5361\u901a\u4fe1\u91cf\u3002<\/li>\n\n\n\n<li><strong>\u6709\u9650\u7684\u8de8 GPU \u8fde\u63a5<\/strong>\uff1a\u5728\u67d0\u4e9b\u5c42\uff08\u5982 Conv3\u3001Conv4\u3001Conv5\uff09\u5f15\u5165\u5c11\u91cf\u8de8 GPU \u7684\u8fde\u63a5\uff0c\u7528\u6765\u4fdd\u6301\u7279\u5f81\u7684\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u6837\u505a\u7684\u597d\u5904\u662f\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5206\u62c5\u663e\u5b58\u538b\u529b<\/strong>\uff1a\u5f53\u65f6\u7684\u663e\u5b58\u6709\u9650\uff0c\u628a\u901a\u9053\u62c6\u5206\u80fd\u4fdd\u8bc1\u7f51\u7edc\u80fd\u653e\u4e0b\u3002<\/li>\n\n\n\n<li><strong>\u5e76\u884c\u8ba1\u7b97<\/strong>\uff1a\u4e24\u4e2a GPU \u540c\u65f6\u8fd0\u7b97\uff0c\u5927\u5e45\u7f29\u77ed\u8bad\u7ec3\u65f6\u95f4\u3002AlexNet \u6700\u7ec8\u7528\u4e86 <strong>5~6 \u5929<\/strong> \u5c31\u5728 ImageNet \u4e0a\u5b8c\u6210\u8bad\u7ec3\uff0c\u800c\u4e0d\u662f\u51e0\u4e2a\u6708\u3002<\/li>\n\n\n\n<li><strong>\u5de5\u7a0b\u4e0a\u7684\u7a81\u7834<\/strong>\uff1a\u8fd9\u662f\u6df1\u5ea6\u5b66\u4e60\u7b2c\u4e00\u6b21\u771f\u6b63\u5229\u7528 GPU \u8fdb\u884c\u5927\u89c4\u6a21\u5377\u79ef\u795e\u7ecf\u7f51\u7edc\u7684\u8bad\u7ec3\uff0c\u5960\u5b9a\u4e86\u540e\u9762\u201cGPU \u662f\u6df1\u5ea6\u5b66\u4e60\u6838\u5fc3\u7b97\u529b\u201d\u7684\u57fa\u7840\u3002<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<p>\u601d\u8003\u9898\uff1a\u6839\u636eLeNet\u53c2\u6570\u4e2a\u6570\u4e3a61706\u4e2a\uff0c\u8ba1\u7b97ALEXNET\u6bcf\u5c42\u53c2\u6570\u7684\u4e2a\u6570\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5377\u79ef\u5c42<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Conv1<\/strong>\uff1a11\u00d711\u00d73\u00d796+96=34944<\/li>\n\n\n\n<li><strong>Conv2\uff08groups=2\uff09<\/strong>\uff1a\u6bcf\u4e2a\u6838\u53ea\u8fde\u5230\u4e0a\u4e00\u5c42\u7684\u4e00\u534a\u901a\u9053 48<br>5\u00d75\u00d748\u00d7256+256=307456<\/li>\n\n\n\n<li><strong>Conv3\uff08\u4e0d\u5206\u7ec4\uff09<\/strong>\uff1a3\u00d73\u00d7256\u00d7384+384=885120<\/li>\n\n\n\n<li><strong>Conv4\uff08groups=2\uff09<\/strong>\uff1a3\u00d73\u00d7192\u00d7384+384=663936<\/li>\n\n\n\n<li><strong>Conv5\uff08groups=2\uff09<\/strong>\uff1a3\u00d73\u00d7192\u00d7256+256=442624<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u5168\u8fde\u63a5\u5c42<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>FC6<\/strong>\uff086\u00d76\u00d7256=9216\u21924096\uff09\uff1a9216\u00d74096+4096=37752832<\/li>\n\n\n\n<li><strong>FC7<\/strong>\uff084096\u21924096\uff09\uff1a4096\u00d74096+4096=16781312<\/li>\n\n\n\n<li><strong>FC8<\/strong>\uff084096\u21921000\uff09\uff1a4096\u00d71000+1000=4097000<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u603b\u8ba1<\/h3>\n\n\n\n<p>60965224<\/p>\n\n\n\n<p>\uff08\u2248 6,096 \u4e07\u53c2\u6570\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p>ALEXNET\u76f8\u5bf9\u4e8eLeNet\uff0c\u505a\u51fa\u4e86\u4e94\u4e2a\u6539\u8fdb\uff1a \u9996\u5148\uff0c\u6211\u4eec\u6765\u770b\u770b\u4ec0\u4e48\u662fALEXNET\uff1a 1. AlexNet [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3045,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[63],"tags":[],"class_list":["post-3339","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mlsh"],"_links":{"self":[{"href":"https:\/\/www.leexinghai.com\/aic\/wp-json\/wp\/v2\/posts\/3339","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.leexinghai.com\/aic\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.leexinghai.com\/aic\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.leexinghai.com\/aic\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.leexinghai.com\/aic\/wp-json\/wp\/v2\/comments?post=3339"}],"version-history":[{"count":2,"href":"https:\/\/www.leexinghai.com\/aic\/wp-json\/wp\/v2\/posts\/3339\/revisions"}],"predecessor-version":[{"id":3342,"href":"https:\/\/www.leexinghai.com\/aic\/wp-json\/wp\/v2\/posts\/3339\/revisions\/3342"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.leexinghai.com\/aic\/wp-json\/wp\/v2\/media\/3045"}],"wp:attachment":[{"href":"https:\/\/www.leexinghai.com\/aic\/wp-json\/wp\/v2\/media?parent=3339"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.leexinghai.com\/aic\/wp-json\/wp\/v2\/categories?post=3339"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.leexinghai.com\/aic\/wp-json\/wp\/v2\/tags?post=3339"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}