{"id":3863,"date":"2021-06-28T23:57:48","date_gmt":"2021-06-28T15:57:48","guid":{"rendered":"http:\/\/www.sniper97.cn\/?p=3863"},"modified":"2021-06-28T23:57:48","modified_gmt":"2021-06-28T15:57:48","slug":"%e3%80%90%e6%b7%b1%e5%ba%a6%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0%e3%80%91%e4%bc%98%e5%8c%96%e5%99%a8%e9%9b%86%e5%90%88","status":"publish","type":"post","link":"http:\/\/www.sniper97.cn\/index.php\/note\/deep-learning\/base\/3863\/","title":{"rendered":"\u3010\u6df1\u5ea6\u5b66\u4e60\u7b14\u8bb0\u3011\u4f18\u5316\u5668\u96c6\u5408"},"content":{"rendered":"\n<p>\u4eca\u5929\u9762\u8bd5\u88ab\u8650\u4e86\uff0c\u56de\u6765\u8865\u4e00\u4e0b\u77e5\u8bc6\u3002<\/p>\n\n\n<h2 class=\"wp-block-heading\">1.\uff08\u968f\u673a\uff09\u68af\u5ea6\u4e0b\u964d \/\uff08 random \uff09gradient descent<\/h2>\n\n\n<p>\u68af\u5ea6\u4e0b\u964d\u5176\u5b9e\u5c31\u662f\u6211\u4eec\u5e38\u89c1\u7684\u201d\u6c42\u5bfc\u7136\u540e\u53cd\u5411\u4f20\u64ad\u201c\u7684\u8fc7\u7a0b\u3002<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"472\" height=\"138\" src=\"\/wp-content\/uploads\/2021\/07\/image-1.png\" alt=\"\" class=\"wp-image-3865\" srcset=\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image-1.png 472w, http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image-1-300x88.png 300w\" sizes=\"(max-width: 472px) 100vw, 472px\" \/><\/figure><\/div>\n\n\n<p>\u6a21\u578b\u53c2\u6570\u7684\u66f4\u65b0\u8c03\u6574\uff0c\u4e0e\u4ee3\u4ef7\u51fd\u6570\u5173\u4e8e\u6a21\u578b\u53c2\u6570\u7684\u68af\u5ea6\u6709\u5173\uff0c\u5373\u6cbf\u7740\u68af\u5ea6\u7684\u65b9\u5411\u4e0d\u65ad\u51cf\u5c0f\u6a21\u578b\u53c2\u6570\uff0c\u4ece\u800c\u6700\u5c0f\u5316\u4ee3\u4ef7\u51fd\u6570\u3002<\/p>\n\n\n<p><strong>\u57fa\u672c\u7b56\u7565\u53ef\u4ee5\u7406\u89e3\u4e3a\u201d\u5728\u6709\u9650\u89c6\u8ddd\u5185\u5bfb\u627e\u6700\u5feb\u8def\u5f84\u4e0b\u5c71\u201c\uff0c\u56e0\u6b64\u6bcf\u8d70\u4e00\u6b65\uff0c\u53c2\u8003\u5f53\u524d\u4f4d\u7f6e\u6700\u9661\u7684\u65b9\u5411(\u5373\u68af\u5ea6)\u8fdb\u800c\u8fc8\u51fa\u4e0b\u4e00\u6b65\u3002<\/strong><\/p>\n\n\n<p>\u53ef\u4ee5\u5f62\u8c61\u7684\u8868\u793a\u4e3a\uff1a<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"566\" src=\"\/wp-content\/uploads\/2021\/07\/image-1024x566.png\" alt=\"\" class=\"wp-image-3864\" srcset=\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image-1024x566.png 1024w, http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image-300x166.png 300w, http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image-768x424.png 768w, http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image-1200x663.png 1200w, http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image.png 1202w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>\u7f3a\u70b9\u4e3a\u5bb9\u6613\u9677\u5165\u5c40\u90e8\u6700\u4f18\u89e3\u3002<\/p>\n\n\n<p>\u800c\u968f\u673a\u68af\u5ea6\u4e0b\u964d\u8fdc\u79bb\u7c7b\u4f3c\uff0c\u53ea\u4e0d\u8fc7\u4e0d\u518d\u662f\u6bcf\u4e00\u6b65\u90fd\u8981\u7cbe\u786e\u8ba1\u7b97\u68af\u5ea6\uff0c\u56e0\u6b64\u6536\u655b\u901f\u5ea6\u66f4\u5feb\uff0c\u4f46\u662f\u4f9d\u7136\u5bb9\u6613\u9677\u5165\u5c40\u90e8\u6700\u4f18\u89e3\u4e2d\u3002<\/p>\n\n\n<h2 class=\"wp-block-heading\">2.\u52a8\u91cf \/ Momentum<\/h2>\n\n\n<p>\u4f7f\u7528\u52a8\u91cf\u540e\u7684SGD\uff0c\u4e3b\u8981\u601d\u60f3\u662f\u5f15\u5165\u4e00\u4e2a\u79ef\u6512\u5386\u53f2\u68af\u5ea6\u4fe1\u606f\u52a8\u91cf\u6765\u52a0\u901fSGD\u3002<\/p>\n\n\n<p>\u4f18\u5316\u8868\u8fbe\u5f0f\u4e3a\uff1a<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"650\" height=\"190\" src=\"\/wp-content\/uploads\/2021\/07\/image-3.png\" alt=\"\" class=\"wp-image-3867\" srcset=\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image-3.png 650w, http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image-3-300x88.png 300w\" sizes=\"(max-width: 650px) 100vw, 650px\" \/><\/figure><\/div>\n\n\n<p>\u5176\u4e2d\uff1avt\u4ee3\u8868t\u65f6\u523b\u7684\u52a0\u901f\u5ea6\uff0c\u963f\u5c14\u6cd5\u4ee3\u8868\u52a8\u529b\u7684\u5927\u5c0f\uff0c\u4e00\u822c\u4e3a0.9\uff08\u8868\u793a\u6700\u5927\u901f\u5ea610\u500d\u4e8eSGD\uff09\uff0c\u03b7t\u4e3a\u5b66\u4e60\u7387\uff0cWt\u8868\u793at\u65f6\u523b\u6a21\u578b\u53c2\u6570\u3002<\/p>\n\n\n<p><strong>\u57fa\u672c\u7b56\u7565\u53ef\u4ee5\u7406\u89e3\u4e3a\uff1a\u4f7f\u5f53\u524d\u6743\u91cd\u6536\u4e0a\u4e00\u6b21\u6743\u91cd\u6539\u53d8\u7684\u5f71\u54cd\uff0c\u7c7b\u4f3c\u4e8e\u5c0f\u7403\u5411\u4e0b\u6eda\u52a8\u7684\u65f6\u5019\u5177\u5907\u4e86\u60ef\u6027\uff08\u68af\u5ea6\u4e0b\u964d\uff09\uff0c\u52a0\u5feb\u5c0f\u7403\u7684\u901f\u5ea6\uff08\u6536\u655b\u901f\u5ea6\uff09\u3002<\/strong><\/p>\n\n\n<p>\u7531\u4e8e\u8fd9\u4e2a\u5c0f\u7403\u53ef\u4ee5\u7ee7\u627f\u524d\u51e0\u6b21\u68af\u5ea6\u7684\u65b9\u5411\uff0c\u56e0\u6b64\u53ef\u4ee5\u66f4\u5feb\u6536\u655b\uff0c\u540c\u65f6\u963f\u5c14\u6cd5\u53c8\u76f8\u5f53\u4e8e\u201c\u6469\u64e6\u529b\u201d\u4f7f\u5f97\u5c0f\u7403\u4e0d\u4f1a\u65e0\u9650\u5236\u7684\u52a0\u901f\u4e0b\u53bb\u3002<\/p>\n\n\n<h2 class=\"wp-block-heading\">3.\u725b\u987f\u52a0\u901f\u68af\u5ea6 \/ NAG, Nesterov accelerated gradient<\/h2>\n\n\n<p>Monentum\u7684\u53d8\u79cd\u3002<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"638\" height=\"186\" src=\"\/wp-content\/uploads\/2021\/07\/image-4.png\" alt=\"\" class=\"wp-image-3868\" srcset=\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image-4.png 638w, http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image-4-300x87.png 300w\" sizes=\"(max-width: 638px) 100vw, 638px\" \/><\/figure><\/div>\n\n\n<p>\u725b\u987f\u68af\u5ea6\u76f8\u6bd4\u52a8\u91cf\u6dfb\u52a0\u4e86\u4e00\u4e2a\u6821\u6b63\u56e0\u5b50\uff0c\u7531\u4e8e\u8be5\u5f0f\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u7c7b\u4f3c\u4e8e\u4e8c\u9636\u5bfc\uff0c\u56e0\u6b64\u53ef\u4ee5\u8ba9\u68af\u5ea6\u4e0b\u964d\u5177\u5907\u4e00\u5b9a\u7684\u524d\u77bb\u6027\u3002<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"387\" src=\"\/wp-content\/uploads\/2021\/07\/image-7-1024x387.png\" alt=\"\" class=\"wp-image-3874\" srcset=\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image-7-1024x387.png 1024w, http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image-7-300x113.png 300w, http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image-7-768x290.png 768w, http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image-7-1200x453.png 1200w, http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image-7.png 1350w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p><strong>\u7406\u89e3\u7b56\u7565\uff1a\u76f8\u6bd4\u52a8\u91cf\u6cd5\u66f4\u5feb\uff0c\u540c\u65f6\u7531\u4e8e\u5177\u6709\u524d\u77bb\u6027\uff0c\u53ef\u4ee5\u63d0\u524d\u77e5\u9053\u68af\u5ea6\u65b9\u5411\u4ee5\u53ca\u4f1a\u4e0d\u4f1a\u8d70\u5230\u5761\u5e95\u4e4b\u540e\u7ee7\u7eed\u4e0a\u5761\u3002<\/strong><\/p>\n\n\n<h2 class=\"wp-block-heading\">4.AdaGrad<\/h2>\n\n\n<p>\u8fd9\u4e2a\u4f18\u5316\u5668\u4e3b\u8981\u80fd\u591f\u89e3\u51b3\u6807\u7b7e\u5206\u5e03\u6781\u4e3a\u4e0d\u5747\u5300\u7684\u60c5\u51b5\u3002<\/p>\n\n\n<p>\u8be5\u65b9\u6cd5\u80fd\u591f\u81ea\u9002\u5e94\u5b66\u4e60\u7387\uff0c\u4f7f\u5f97\u5177\u6709\u5927\u4ee3\u4ef7\u51fd\u6570\u7684\u53c2\u6570\u5feb\u901f\u4e0b\u964d\uff08\u9ad8\u5b66\u4e60\u7387\uff09\uff0c\u800c\u4f4e\u4ee3\u4ef7\u7684\u53c2\u6570\u5177\u6709\u8f83\u5c0f\u7684\u4e0b\u964d\u901f\u5ea6\u3002<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"730\" height=\"196\" src=\"\/wp-content\/uploads\/2021\/07\/image-5.png\" alt=\"\" class=\"wp-image-3869\" srcset=\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image-5.png 730w, http:\/\/www.sniper97.cn\/wp-content\/uploads\/2021\/07\/image-5-300x81.png 300w\" sizes=\"(max-width: 730px) 100vw, 730px\" \/><\/figure><\/div>\n\n\n<p>\u5176\u4e2d\uff0cgt,i\u4ee3\u8868t\u65f6\u523b\u5206\u7c7bi\u7684\u68af\u5ea6\u3002<\/p>\n\n\n<p>AdaGrad\u7684\u4e3b\u8981\u4f18\u52bf\u4e3a\u4e0d\u9700\u8981\u8ba4\u4e3a\u5e72\u9884\u5b66\u4e60\u7387\uff0c\u53ef\u4ee5\u81ea\u52a8\u8c03\u8282\uff0c\u5e76\u4e14\u9002\u7528\u4e8e\u6807\u7b7e\u5206\u5e03\u4e0d\u5747\u7684\u6570\u636e\u96c6\u3002<\/p>\n\n\n<p>\u7f3a\u70b9\u4e3a\u968f\u7740\u8fed\u4ee3\u6b21\u6570\u7684\u589e\u52a0\uff0c\u5b66\u4e60\u7387\u4f1a\u8d8a\u6765\u8d8a\u5c0f\uff0c\u6700\u7ec8\u8d8b\u8fd1\u4e8e0.<\/p>\n\n\n<h2 class=\"wp-block-heading\">5.RMSProp<\/h2>\n\n\n<p>RMSProp\u76f8\u6bd4\bAdaGrad\u505a\u4e86\u4e00\u4e9b\u6539\u8fdb\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>cache = decay_rate * cache + (1 - decay_rate) * dx**2\nx += - learning_rate * dx \/ (np.sqrt(cache) + eps)<\/code><\/pre>\n\n\n<p><strong>\u53ef\u4ee5\u770b\u51fa\uff0cRMSProp\u501f\u9274\u4e86AdaGrad\u7684\u601d\u60f3\uff0c\u540c\u65f6\u5c06\u5206\u6bcd\u90e8\u5206\u53d8\u6210\u4e86\u52a0\u6743\u5e73\u5747\uff0c\u907f\u514d\u4e86\u5b66\u4e60\u7387\u8d8a\u6765\u8d8a\u4f4e\u7684\u95ee\u9898\uff0c\u5e76\u4e14\u4f9d\u7136\u5177\u5907\u81ea\u9002\u5e94\u5b66\u4e60\u7387\u8c03\u6574\u7684\u80fd\u529b\u3002<\/strong><\/p>\n\n\n<p>RMSProp\u4ece\u7ecf\u9a8c\u4e0a\u5df2\u7ecf\u88ab\u8bc1\u660e\u662f\u4e00\u79cd\u6709\u6548\u7684\u6df1\u5ea6\u5b66\u4e60\u7f51\u7edc\u4f18\u5316\u7b97\u6cd5\u3002<\/p>\n\n\n<h2 class=\"wp-block-heading\">6.Adam<\/h2>\n\n\n<p>Adam\u501f\u9274\u4e86AdaGrad\u548cRMSprop\u7684\u601d\u8def\uff0c\u5c06\u52a8\u91cf\u5f15\u5165RMSProp\u3002<\/p>\n\n\n<pre class=\"wp-block-code\"><code>    m = beta1*m + (1-beta1)*dx\n    v = beta2*v + (1-beta2)*(dx**2)\n    x += - learning_rate * m \/ (np.sqrt(v) + eps)<\/code><\/pre>\n\n\n<p>adam\u6709\u4e24\u4e2a\u8d85\u53c2\uff0cbeta1\u4e0ebeta2\uff0c\u9ed8\u8ba4\u503c\u5206\u522b\u4e3a0.9\u548c0.999\u3002<\/p>\n\n\n<p>\u76f8\u6bd4RMSProp\uff0cAdam\u6ca1\u6709\u4f7f\u7528\u68af\u5ea6dx\uff0c\u800c\u662f\u5c06dx\u901a\u8fc7beta1\u8fdb\u884c\u5e73\u6ed1\u3002<\/p>\n\n\n<p>\u5b8c\u6574\u7684Adam\u66f4\u65b0\u7b97\u6cd5\u4e5f\u5305\u542b\u4e86\u4e00\u4e2a\u504f\u7f6e\uff08bias\uff09\u77eb\u6b63\u673a\u5236\uff0c\u56e0\u4e3am,v\u4e24\u4e2a\u77e9\u9635\u521d\u59cb\u4e3a0\uff0c\u5728\u6ca1\u6709\u5b8c\u5168\u70ed\u8eab\u4e4b\u524d\u5b58\u5728\u504f\u5dee\uff0c\u9700\u8981\u91c7\u53d6\u4e00\u4e9b\u8865\u507f\u63aa\u65bd\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<p>\u5176\u5b9e\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\uff0cAdam\uff0cAdaGrad\uff0cRMSprop\u8fd9\u51e0\u4e2a\u4f18\u5316\u5668\u90fd\u6709\u4e00\u4e2alearning_rate\/np.sqrt() \u9879\uff0c\u8be5\u9879\u5176\u5b9e\u53ef\u4ee5\u7406\u89e3\u6210\u4fe1\u566a\u6bd4\uff0c\u5f53\u5728\u8bad\u7ec3\u521d\u671f\uff0c\u7f51\u7edc\u524d\u8fdb\u7684\u65b9\u5411\u8f83\u4e3a\u660e\u663e\uff0c\u800c\u4e24\u4fa7\u7684\u68af\u5ea6\uff08\u566a\u97f3\uff09\u76f8\u5bf9\u524d\u8fdb\u65b9\u5411\u8f83\u5c0f\uff0c\u4fe1\u566a\u6bd4\u8f83\u9ad8\uff0c\u53ef\u4ee5\u8fdb\u884c\u8f83\u5927\u7684\u68af\u5ea6\u4f20\u64ad\uff0c\u800c\u5f53\u63a5\u8fd1\u8c37\u5e95\u662f\uff0c\u7531\u4e8e\u524d\u8fdb\u7684\u65b9\u5411\u4e0d\u518d\u660e\u663e\uff0c\u4fe1\u566a\u6bd4\u5341\u5206\u63a5\u8fd1\u4e8e0\uff0c\u56e0\u6b64\u524d\u8fdb\u7684\u4e5f\u5c31\u7279\u522b\u6162\uff0c\u76f8\u5f53\u4e8e\u5929\u7136\u5177\u6709\u9000\u706b\u7684\u80fd\u529b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4eca\u5929\u9762\u8bd5\u88ab\u8650\u4e86\uff0c\u56de\u6765\u8865\u4e00\u4e0b\u77e5\u8bc6\u3002 1.\uff08\u968f\u673a\uff09\u68af\u5ea6\u4e0b\u964d \/\uff08 random \uff09gradient de [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[8,9],"tags":[33,37,39],"views":3740,"_links":{"self":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/3863"}],"collection":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/comments?post=3863"}],"version-history":[{"count":0,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/3863\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/media?parent=3863"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/categories?post=3863"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/tags?post=3863"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}