{"id":787,"date":"2021-01-18T23:36:08","date_gmt":"2021-01-18T15:36:08","guid":{"rendered":"http:\/\/www.mustenaka.cn\/?p=787"},"modified":"2021-02-09T09:00:08","modified_gmt":"2021-02-09T01:00:08","slug":"andrewngnotebook","status":"publish","type":"post","link":"https:\/\/www.mustenaka.cn\/index.php\/2021\/01\/18\/andrewngnotebook\/","title":{"rendered":"\u5434\u6069\u8fbe\u8bfe\u7a0b\u7b14\u8bb01"},"content":{"rendered":"<blockquote><p>\u8bf4\u660e\uff1a\u672c\u6587\u7ae0\u4e3a\u81ea\u5df1\u7684\u7b14\u8bb0\uff0c\u4ee5\u81ea\u5df1\u770b\u7684\u61c2\u4e3a\u6807\u51c6\uff0c\u4f1a\u7701\u7565\u4e00\u4e9b\u5185\u5bb9<\/p>\n<p>\u89c6\u9891\u662f\u5728B\u7ad9\u4e0a\u9762\u770b\u7684\uff0c\u8fde\u63a5\u4e3a\uff1a<a href=\"https:\/\/www.bilibili.com\/video\/BV1FT4y1E74V\">https:\/\/www.bilibili.com\/video\/BV1FT4y1E74V<\/a><\/p><\/blockquote>\n<p>\u672c\u7ae0\u7b14\u8bb0\u8bb0\u6709\u5982\u4e0b\u5185\u5bb9\uff1a<\/p>\n<ol>\n<li>\u7ed3\u6784\u5316\uff0c\u975e\u7ed3\u6784\u5316\u6570\u636e<\/li>\n<li>Logistic\u56de\u5f52\u57fa\u672c\u6982\u5ff5<\/li>\n<li>sigmoid\u51fd\u6570<\/li>\n<li>\u635f\u5931\u51fd\u6570<\/li>\n<li>\u9648\u672c\u51fd\u6570<\/li>\n<li>\u68af\u5ea6\u4e0b\u964d\u65b9\u6cd5<\/li>\n<li>\u5bfc\u6570<\/li>\n<li>\u8ba1\u7b97\u56fe<\/li>\n<li>Logistic\u56de\u5f52\u4e2d\u68af\u5ea6\u4e0b\u964d\u65b9\u6cd5<\/li>\n<li>m\u4e2a\u6837\u672c\u4e2dLogistic\u56de\u5f52\u7684\u68af\u5ea6\u4e0b\u964d<\/li>\n<li>\u5173\u4e8e\u903b\u8f91\u56de\u5f52\u635f\u5931\u51fd\u6570\u7684\u89e3\u91ca<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p>1.\u7ed3\u6784\u5316\u6570\u636e\uff08Structured Data\uff09\uff0c\u975e\u7ed3\u6784\u5316\u6570\u636e\uff08Unstructured Data\uff09<\/p>\n<ul>\n<li>\u7ed3\u6784\u5316\u6570\u636e\uff1a\u5982\u6570\u636e\u5e93\uff0c\u6bcf\u4e00\u4e2a\u6570\u636e\u90fd\u6709\u5176\u5bf9\u5e94\u7684\u89c4\u8303\uff0c\u6bd4\u5982 \u5b66\u751f\u7c7b\u91cc\u9762\u6709 \u5b66\u53f7\uff0c\u59d3\u540d\uff0c\u6210\u7ee9\u7b49\u7b49\uff0c\u8fd9\u4e9b\u90fd\u5c5e\u4e8e\u7ed3\u6784\u5316\u7684\u6570\u636e<\/li>\n<li>\u975e\u7ed3\u6784\u5316\u6570\u636e\uff1a\u5982\u539f\u59cb\u97f3\u9891\uff0c\u56fe\u50cf\uff0c\u4e00\u6bb5\u6587\u5b57<\/li>\n<\/ul>\n<p>\u7ed3\u6784\u5316\u6570\u636e\u5f80\u5f80\u662f\u8ba1\u7b97\u673a\u4f7f\u7528\u8f83\u4e3a\u7406\u60f3\u7684\uff0c\u800c\u975e\u7ed3\u6784\u5316\u6570\u636e\u5f80\u5f80\u6307\u7684\u662f\u4e00\u4e9b\u6ca1\u6709\u7ecf\u8fc7\u5904\u7406\u7684\uff0c\u8f83\u4e3a\u539f\u59cb\u7684\u6570\u636e\u3002<\/p>\n<p>&nbsp;<\/p>\n<h3>\u4e00.Logistic \u903b\u8f91\u56de\u5f52<\/h3>\n<p>Logistic\u7528\u4e8e\u4e8c\u5206\u7c7b\uff08binary classification\uff09\u7b97\u6cd5<\/p>\n<p>x\u8f93\u5165 &#8212;&#8212;&#8211;&gt; y\u8f93\u51fa<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0326.png\" alt=\"\" width=\"2160\" height=\"1620\" class=\"alignnone size-full wp-image-801\" srcset=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0326.png 2160w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0326-300x225.png 300w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0326-1024x768.png 1024w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0326-768x576.png 768w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0326-1536x1152.png 1536w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0326-2048x1536.png 2048w\" sizes=\"(max-width: 2160px) 100vw, 2160px\" \/><\/p>\n<blockquote><p>\u8f93\u5165\u4e00\u5f2064*64\u5f69\u8272\u56fe\u7247\uff08\u5047\u8bbe\u662fjpg\uff0c\u4e09\u901a\u9053\uff0c\u7ea2\u7eff\u84dd\uff09\uff0c\u7279\u5f81\u5411\u91cfx\u5c31\u662f64*64*3 = 12288\uff0c\u5206\u522b\u5c31\u662f\u4e09\u4e2a\u901a\u9053\u7684\u5168\u90e8\u50cf\u7d20\u503c\uff0c\u53ef\u4ee5\u76f4\u63a5\u8bbe n = nx =12288\uff0c\u6765\u8868\u793a\u8f93\u5165\u7684\u7279\u5f81\u5411\u91cfx\u7684\u7ef4\u5ea6\u3002<\/p><\/blockquote>\n<p>(x,y) \u8868\u793a\u4e00\u4e2a\u5355\u72ec\u7684\u6837\u672c \uff0c y\u5c5e\u4e8e {0,1}\uff08\u4e8c\u5206\u6837\u672c\uff09<\/p>\n<p>\u6211\u4eec\u5e38\u5e38\u7528 m = m_train \u8868\u793a\u8bad\u7ec3\u6837\u672c \uff0c m = m_test \u8868\u793a\u6d4b\u8bd5\u6837<\/p>\n<p>X\uff08\u5927\u5199\uff09\uff0c\u8868\u793a\u6574\u4e2a\u8f93\u5165\u7684\u77e9\u9635\uff0c\u540c\u7406Y<\/p>\n<p>Python\u4e2d\u5e38\u7528X.shape = (nx,m)\u8fd9\u6837\u53d6\u6570\u636e \uff0cY.shape = (1,m)<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0321.png\" alt=\"\" width=\"2160\" height=\"1620\" class=\"alignnone size-full wp-image-793\" srcset=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0321.png 2160w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0321-300x225.png 300w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0321-1024x768.png 1024w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0321-768x576.png 768w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0321-1536x1152.png 1536w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0321-2048x1536.png 2048w\" sizes=\"(max-width: 2160px) 100vw, 2160px\" \/><\/p>\n<h4>1.\uff1asigmoid\u51fd\u6570<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/d009b3de9c82d158dfb4e7218a0a19d8bc3e426f.jpeg\" alt=\"\" width=\"400\" height=\"400\" class=\"alignnone size-full wp-image-882\" srcset=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/d009b3de9c82d158dfb4e7218a0a19d8bc3e426f.jpeg 400w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/d009b3de9c82d158dfb4e7218a0a19d8bc3e426f-300x300.jpeg 300w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/d009b3de9c82d158dfb4e7218a0a19d8bc3e426f-150x150.jpeg 150w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/p>\n<div class=\"para\" label-module=\"para\">sigmoid\u51fd\u6570\u4e5f\u53ebLogistic\u51fd\u6570\uff0c\u7528\u4e8e\u9690\u5c42\u795e\u7ecf\u5143\u8f93\u51fa\uff0c\u53d6\u503c\u8303\u56f4\u4e3a(0,1)\uff0c\u5b83\u53ef\u4ee5\u5c06\u4e00\u4e2a\u5b9e\u6570\u6620\u5c04\u5230(0,1)\u7684\u533a\u95f4\uff0c\u53ef\u4ee5\u7528\u6765\u505a\u4e8c\u5206\u7c7b\u3002\u5728\u7279\u5f81\u76f8\u5dee\u6bd4\u8f83\u590d\u6742\u6216\u662f\u76f8\u5dee\u4e0d\u662f\u7279\u522b\u5927\u65f6\u6548\u679c\u6bd4\u8f83\u597d\u3002Sigmoid\u4f5c\u4e3a\u6fc0\u6d3b\u51fd\u6570\u6709\u4ee5\u4e0b\u4f18\u7f3a\u70b9\uff1a<\/div>\n<div class=\"para\" label-module=\"para\">\u4f18\u70b9\uff1a\u5e73\u6ed1\u3001\u6613\u4e8e\u6c42\u5bfc\u3002<\/div>\n<div class=\"para\" label-module=\"para\">\u7f3a\u70b9\uff1a\u6fc0\u6d3b\u51fd\u6570\u8ba1\u7b97\u91cf\u5927\uff0c\u53cd\u5411\u4f20\u64ad\u6c42\u8bef\u5dee\u68af\u5ea6\u65f6\uff0c\u6c42\u5bfc\u6d89\u53ca\u9664\u6cd5\uff1b\u53cd\u5411\u4f20\u64ad\u65f6\uff0c\u5f88\u5bb9\u6613\u5c31\u4f1a\u51fa\u73b0\u68af\u5ea6\u6d88\u5931\u7684\u60c5\u51b5\uff0c\u4ece\u800c\u65e0\u6cd5\u5b8c\u6210\u6df1\u5c42\u7f51\u7edc\u7684\u8bad\u7ec3\u3002<\/div>\n<div class=\"para\" label-module=\"para\">Sigmoid\u51fd\u6570\u7531\u4e0b\u5217\u516c\u5f0f\u5b9a\u4e49<\/div>\n<div class=\"para\" label-module=\"para\">\n<section class=\"formula-container formula-container__blockcenter\">\n<div class=\"layoutblockcenter formula\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/XJLPD@JLDO6R@KBY7.png\" alt=\"\" width=\"222\" height=\"72\" class=\"alignnone size-full wp-image-883\" \/><img decoding=\"async\" class=\"J-formula-img\" align=\"absmiddle\" alt=\"\" title=\"\" src=\"https:\/\/bkimg.cdn.bcebos.com\/formula\/7e627f6301407c3d610d2c2cab711f3f.svg\" data-png=\"https:\/\/bkimg.cdn.bcebos.com\/formula\/7e627f6301407c3d610d2c2cab711f3f.png\" data-width=\"132\" data-height=\"42\" \/><\/div>\n<\/section>\n<\/div>\n<div class=\"para\" label-module=\"para\">\u5176\u5bf9x\u7684\u5bfc\u6570\u53ef\u4ee5\u7528\u81ea\u8eab\u8868\u793a\uff1a<\/div>\n<div label-module=\"para\">\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/GKNJJ05H0BBL4M@YDN6Q.png\" alt=\"\" width=\"387\" height=\"81\" class=\"alignnone size-full wp-image-884\" srcset=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/GKNJJ05H0BBL4M@YDN6Q.png 387w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/GKNJJ05H0BBL4M@YDN6Q-300x63.png 300w\" sizes=\"(max-width: 387px) 100vw, 387px\" \/><\/div>\n<div class=\"para\" label-module=\"para\">\n<section class=\"formula-container formula-container__blockcenter\">\n<div class=\"layoutblockcenter formula\"><img decoding=\"async\" class=\"J-formula-img\" align=\"absmiddle\" alt=\"\" title=\"\" src=\"https:\/\/bkimg.cdn.bcebos.com\/formula\/06abbe5c050770300de9c91bc76e4af5.svg\" data-png=\"https:\/\/bkimg.cdn.bcebos.com\/formula\/06abbe5c050770300de9c91bc76e4af5.png\" data-width=\"303\" data-height=\"48\" \/><\/div>\n<\/section>\n<\/div>\n<div class=\"para\" label-module=\"para\">Sigmoid\u51fd\u6570\u7684\u56fe\u5f62\u5982S\u66f2\u7ebf<\/div>\n<div label-module=\"para\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/T44MEUJVHXCEOW2O.png\" alt=\"\" width=\"1395\" height=\"660\" class=\"alignnone size-full wp-image-817\" srcset=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/T44MEUJVHXCEOW2O.png 1395w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/T44MEUJVHXCEOW2O-300x142.png 300w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/T44MEUJVHXCEOW2O-1024x484.png 1024w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/T44MEUJVHXCEOW2O-768x363.png 768w\" sizes=\"(max-width: 1395px) 100vw, 1395px\" \/><\/div>\n<div label-module=\"para\"><\/div>\n<div label-module=\"para\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0323.png\" alt=\"\" width=\"2160\" height=\"1620\" class=\"alignnone size-full wp-image-795\" srcset=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0323.png 2160w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0323-300x225.png 300w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0323-1024x768.png 1024w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0323-768x576.png 768w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0323-1536x1152.png 1536w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0323-2048x1536.png 2048w\" sizes=\"(max-width: 2160px) 100vw, 2160px\" \/><\/div>\n<h4 label-module=\"para\">2.\u635f\u5931\u51fd\u6570L<\/h4>\n<div label-module=\"para\">\u901a\u5e38\u4f7f\u7528\uff0c1\/2*\uff08y\u5e3d\u548cy\u7684\u5dee\u7684\u5e73\u65b9\uff09<\/div>\n<div label-module=\"para\">\u5bf9\u4e8e\u635f\u5931\u51fd\u6570\u76f4\u89c2\u7684\u7406\u89e3\u4e3a\uff1a\u6211\u4eec\u901a\u8fc7\u5b9a\u4e49\u8fd9\u4e2a\u635f\u5931\u51fd\u6570L\uff0c\u6765\u8861\u91cf\u4f60\u7684\u9884\u6d4b\u8f93\u51fa\u503cy\u5e3d\uff0c\u548cy\u7684\u5b9e\u9645\u503c\u6709\u591a\u63a5\u8fd1\u3002\u8bef\u5dee\u7684\u5e73\u65b9\u3002<\/div>\n<div label-module=\"para\">\u4f46\u662f \u5728\u903b\u8f91\u56de\u5f52 \u4e2d\uff0c\u6211\u4eec\u4e60\u60ef\u5b9a\u4e49\uff08\u4e0a\u9762\u90a3\u4e2a\u4e0d\u9002\u5408\u903b\u8f91\u56de\u5f52\uff0c\u6240\u4ee5\u5b9a\u4e49\u4e00\u4e2a\u65b0\u7684\uff09<\/div>\n<div label-module=\"para\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/MO64J27FHKMMV2GC3HW.png\" alt=\"\" width=\"1217\" height=\"341\" class=\"alignnone size-full wp-image-796\" srcset=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/MO64J27FHKMMV2GC3HW.png 1217w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/MO64J27FHKMMV2GC3HW-300x84.png 300w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/MO64J27FHKMMV2GC3HW-1024x287.png 1024w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/MO64J27FHKMMV2GC3HW-768x215.png 768w\" sizes=\"(max-width: 1217px) 100vw, 1217px\" \/><\/div>\n<div label-module=\"para\">\u635f\u5931\u51fd\u6570\u5c3d\u53ef\u80fd\u5c0f\u4e3a\u597d\uff0c\u635f\u5931\u51fd\u6570\u5b9a\u4e49\u662f\u5728\u5355\u4e2a\u8bad\u7ec3\u6837\u672c\u4e2d\u5b9a\u4e49\u7684\uff0c\u5b83\u8861\u91cf\u4e86\u5728\u5355\u4e2a\u8bad\u7ec3\u6837\u672c\u4e0a\u7684\u8868\u73b0\u3002<\/div>\n<h4 label-module=\"para\">3.\u6210\u672c\u51fd\u6570J<\/h4>\n<div label-module=\"para\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/M@X3U2@0OV3H@RWUQF13T.png\" alt=\"\" width=\"1542\" height=\"251\" class=\"alignnone size-full wp-image-798\" srcset=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/M@X3U2@0OV3H@RWUQF13T.png 1542w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/M@X3U2@0OV3H@RWUQF13T-300x49.png 300w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/M@X3U2@0OV3H@RWUQF13T-1024x167.png 1024w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/M@X3U2@0OV3H@RWUQF13T-768x125.png 768w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/M@X3U2@0OV3H@RWUQF13T-1536x250.png 1536w\" sizes=\"(max-width: 1542px) 100vw, 1542px\" \/><\/div>\n<div label-module=\"para\">\u6210\u672c\u51fd\u6570 \u662f\u57fa\u4e8e\u53c2\u6570\u7684\u603b\u6210\u672c<\/div>\n<div label-module=\"para\">\u6ce8\u610f\u6210\u672c\u51fd\u6570\u6709\u7684\u65f6\u5019\u4f1a\u4e58\u4e0a1\/2\uff0c<span>\u4e58\u4e0a1\/2\u662f\u4e3a\u4e86\u65b9\u4fbf\u540e\u9762\u6c42\u504f\u5bfc\u6570\u65f6\u7ed3\u679c\u66f4\u52a0\u7b80\u6d01\uff0c\u4e4b\u6240\u4ee5\u80fd\u4e58\u4e0a1\/2\u662f\u56e0\u4e3a\u4e58\u4e0a\u8fd9\u4e2a\u7cfb\u6570\u540e\u5bf9\u6c42\u89e3\u98ce\u9669\u51fd\u6570\u6700\u4f18\u503c\u6ca1\u6709\u5f71\u54cd\u3002<\/span><br \/>\n<span>\u6211\u4eec\u7684\u76ee\u6807\u5c31\u662f\u8981\u6700\u5c0f\u5316\u98ce\u9669\u51fd\u6570\uff0c\u4f7f\u5f97\u6211\u4eec\u7684\u62df\u5408\u51fd\u6570\u80fd\u591f\u6700\u5927\u7a0b\u5ea6\u7684\u5bf9\u76ee\u6807\u51fd\u6570y\u8fdb\u884c\u62df\u5408\uff0c<\/span><\/div>\n<div label-module=\"para\">\u5728\u8bad\u7ec3logistic \u8981\u9009\u62e9\u5408\u9002\u7684w\u548cb\uff0c\u8ba9\u8bad\u7ec3\u6210\u672cJ\u66f4\u52a0\u5c0f\u3002<\/div>\n<div label-module=\"para\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0323-1.png\" alt=\"\" width=\"2160\" height=\"1620\" class=\"alignnone size-full wp-image-799\" srcset=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0323-1.png 2160w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0323-1-300x225.png 300w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0323-1-1024x768.png 1024w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0323-1-768x576.png 768w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0323-1-1536x1152.png 1536w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0323-1-2048x1536.png 2048w\" sizes=\"(max-width: 2160px) 100vw, 2160px\" \/><\/div>\n<div label-module=\"para\">\u603b\u7ed3\uff1a<\/div>\n<blockquote>\n<div label-module=\"para\">\u635f\u5931\u51fd\u6570\uff1a\u8861\u91cf\u5355\u4e00\u8bad\u7ec3\u6837\u4f8b\u7684\u6548\u679c<\/div>\n<div label-module=\"para\">\u6210\u672c\u51fd\u6570\uff1a\u8861\u91cf\u53c2\u6570w\u548cb\u7684\u6548\u679c\u5728\u5168\u90e8\u6570\u636e\u96c6\u4e0a\u7684\u6548\u679c<\/div>\n<\/blockquote>\n<div label-module=\"para\"><\/div>\n<h4 label-module=\"para\">4.\u68af\u5ea6\u4e0b\u964d\u65b9\u6cd5<\/h4>\n<div label-module=\"para\"><span>\u68af\u5ea6\u4e0b\u964d\u6cd5\uff08gradient descent\uff09\uff0c\u53c8\u540d\u6700\u901f\u4e0b\u964d\u6cd5\uff08steepest 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width=\"2160\" height=\"1620\" class=\"alignnone size-full wp-image-804\" srcset=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_032720210119-224219.jpg 2160w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_032720210119-224219-300x225.jpg 300w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_032720210119-224219-1024x768.jpg 1024w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_032720210119-224219-768x576.jpg 768w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_032720210119-224219-1536x1152.jpg 1536w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_032720210119-224219-2048x1536.jpg 2048w\" sizes=\"(max-width: 2160px) 100vw, 2160px\" \/><\/div>\n<div label-module=\"para\">\uff08\u6ce8\uff1a\u56fd\u5185\u7684\u6570\u5b66\u6559\u6750\u5bf9\u4e8e\u51f9\u51f8\u51fd\u6570\u548c\u56fd\u5916\u7684\u5f88\u591a\u6559\u6750\u6240\u4f7f\u7528\u7684\u51f9\u51f8\u51fd\u6570\u662f\u521a\u597d\u53cd\u8fc7\u6765\u7684\uff09<\/div>\n<div label-module=\"para\"><\/div>\n<div label-module=\"para\">\u68af\u5ea6\u4e0b\u964d\u7684\u65b9\u6cd5\u662f\u7528 w = w &#8211; \u03b1 * \uff08\u5bf9J\u6210\u672c\u51fd\u6570\u6c42\u5bf9w\u7684\u504f\u5bfc\u6570\uff09\u3010\u540c\u7406\u6c42b\u3011<\/div>\n<div label-module=\"para\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_032920210120-111743.jpg\" alt=\"\" width=\"2160\" height=\"1620\" class=\"alignnone size-full wp-image-808\" srcset=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_032920210120-111743.jpg 2160w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_032920210120-111743-300x225.jpg 300w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_032920210120-111743-1024x768.jpg 1024w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_032920210120-111743-768x576.jpg 768w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_032920210120-111743-1536x1152.jpg 1536w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_032920210120-111743-2048x1536.jpg 2048w\" sizes=\"(max-width: 2160px) 100vw, 2160px\" \/><\/div>\n<h4 label-module=\"para\">5.\u5bfc\u6570\uff0c<\/h4>\n<div label-module=\"para\">\u4e2a\u4eba\u5efa\u8bae\u81ea\u5df1\u770b\u4e00\u4e0b\u8003\u7814\u6570\u5b66\u91cc\u9762\u7684\u4e1c\u897f\uff08\u5305\u62ec\u9ad8\u7b49\u6570\u5b66\uff0c\u7ebf\u6027\u4ee3\u6570\uff0c\u6982\u7387\u8bba\uff09\uff0c\u65e0\u8bba\u662f\u6c64\u5bb6\u51e4\u7684\u8fd8\u662f\u5f20\u5b87\u7684\u90fdOK\uff0c\u5434\u6069\u8fbe\u7684\u8bb2\u7684\u592a\u8a00\u7b80\u610f\u8d45\u4e86\uff0c\u5b66AI\u8bf7\u52a1\u5fc5\u62ff\u56de\u9ad8\u7b49\u6570\u5b66\u7684\u5fae\u79ef\u5206\u3002<\/div>\n<blockquote>\n<div label-module=\"para\">\u5fae\u79ef\u5206\uff1acalculus<\/div>\n<div label-module=\"para\">\u5bfc\u6570\uff1aderivatives<\/div>\n<\/blockquote>\n<h4 label-module=\"para\">6.\u8ba1\u7b97\u56fe<\/h4>\n<div label-module=\"para\">\u6574\u4f53\u6765\u8bf4\u5c31\u662f\u6559\u4f60\uff0c\u600e\u4e48\u6837\u505a\u6d41\u7a0b\uff0c\u5c06\u8f93\u5165\u653e\u5728\u4e00\u7aef\uff0c\u8f93\u51fa\u5728\u53e6\u4e00\u7aef\uff0c\u7136\u540e\u4e2d\u95f4\u6bcf\u4e00\u4e2a\u6b65\u9aa4\u5408\u6210\uff0c\u6700\u7ec8\u751f\u6210\u6700\u7ec8\u7b54\u6848\u3002\u8fd9\u662f\u4e00\u79cd\u601d\u8def\uff0c\u4e00\u79cd\u601d\u7ef4\u3002<\/div>\n<div label-module=\"para\">\u8fd9\u6837\u505a\u7684\u4e00\u79cd\u597d\u5904\u5c31\u662f\uff0c\u7b80\u5316\u540e\u7684\u603b\u5f0f\u5b50\uff0c\u6bd4\u8f83\u597d\u505a\u5bfc\u6570\uff0c\u6bd4\u8f83\u597d\u505a\u5bfc\u6570\u5c31\u5bb9\u6613\u6c42\u51fa\u68af\u5ea6\u4e0b\u964d<\/div>\n<div label-module=\"para\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033120210121-211039.jpg\" alt=\"\" width=\"2160\" height=\"1620\" class=\"alignnone size-full wp-image-813\" srcset=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033120210121-211039.jpg 2160w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033120210121-211039-300x225.jpg 300w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033120210121-211039-1024x768.jpg 1024w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033120210121-211039-768x576.jpg 768w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033120210121-211039-1536x1152.jpg 1536w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033120210121-211039-2048x1536.jpg 2048w\" sizes=\"(max-width: 2160px) 100vw, 2160px\" \/><\/div>\n<div label-module=\"para\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033220210121-212341.jpg\" alt=\"\" width=\"2160\" height=\"1620\" class=\"alignnone size-full wp-image-815\" srcset=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033220210121-212341.jpg 2160w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033220210121-212341-300x225.jpg 300w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033220210121-212341-1024x768.jpg 1024w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033220210121-212341-768x576.jpg 768w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033220210121-212341-1536x1152.jpg 1536w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033220210121-212341-2048x1536.jpg 2048w\" sizes=\"(max-width: 2160px) 100vw, 2160px\" \/><\/div>\n<div label-module=\"para\"><\/div>\n<div label-module=\"para\">\u7531J\u5f15\u8d77\u7684\u6c42\u5bfc\u53d8\u5316\u4e00\u8def\u5411\u524d\u4f20\u5bfc\uff0c\u4f20\u5230a\uff0cu\u518d\u7ee7\u7eed\u53d8\u6210\u5f71\u54cda,b,c\uff08\u5fae\u79ef\u5206\u4e0a\u53eb\u505a\u94fe\u5f0f\u6cd5\u5219\uff09\u3002\u8fd9\u4e5f\u5c31\u662f<strong>\u3010\u5411\u524d\u4f20\u64ad\u3011<\/strong><\/div>\n<h4 label-module=\"para\">7.\u903b\u8f91\u56de\u5f52\u4e2d\u7684\u68af\u5ea6\u4e0b\u964d\u65b9\u6cd5\uff08\u5355\u4e2a\uff09<\/h4>\n<p>\u53c2\u8003\u672c\u56fe\uff0c\u6709\u4e24\u4e2a\u8f93\u5165\uff0cx1w1\uff0cx2w2\uff0c\u4e3b\u8981\u5185\u5bb9\u4e0a\u9762\u90fd\u53ef\u4ee5\u627e\u5230\uff0c\u8fd9\u4e2a\u56fe\u89e3\u91ca\u4e86\u5982\u4f55\u7528\u6765\u8bad\u7ec3\u4e00\u4e2a\u5355\u4e2a\u6837\u672c\u3002\u4f46\u662f\u5b9e\u9645\u60c5\u51b5\u662f\u7528\u6570\u636e\u96c6\uff0c\u6709m\u4e2a\u6570\u636e\u6837\u672c\u3002<\/p>\n<div label-module=\"para\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033520210121-215543.jpg\" alt=\"\" width=\"2160\" height=\"1620\" class=\"alignnone size-full wp-image-822\" srcset=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033520210121-215543.jpg 2160w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033520210121-215543-300x225.jpg 300w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033520210121-215543-1024x768.jpg 1024w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033520210121-215543-768x576.jpg 768w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033520210121-215543-1536x1152.jpg 1536w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_033520210121-215543-2048x1536.jpg 2048w\" sizes=\"(max-width: 2160px) 100vw, 2160px\" \/><\/div>\n<h4 label-module=\"para\">8.m\u4e2a\u6837\u672c\u4e2d\u7684\u903b\u8f91\u56de\u5f52\u4e2d\u7684\u68af\u5ea6\u4e0b\u964d<\/h4>\n<blockquote><p>\u8bf7\u5148\u56de\u987e\u4e00\u4e0b\u6210\u672c\u51fd\u6570J<\/p><\/blockquote>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0337.png\" alt=\"\" width=\"2160\" height=\"1620\" class=\"alignnone size-full wp-image-825\" srcset=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0337.png 2160w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0337-300x225.png 300w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0337-1024x768.png 1024w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0337-768x576.png 768w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0337-1536x1152.png 1536w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_0337-2048x1536.png 2048w\" sizes=\"(max-width: 2160px) 100vw, 2160px\" 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loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_034520210203-110551.jpg\" alt=\"\" width=\"2160\" height=\"1620\" class=\"alignnone size-full wp-image-874\" srcset=\"https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_034520210203-110551.jpg 2160w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_034520210203-110551-300x225.jpg 300w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_034520210203-110551-1024x768.jpg 1024w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_034520210203-110551-768x576.jpg 768w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_034520210203-110551-1536x1152.jpg 1536w, https:\/\/www.mustenaka.cn\/wp-content\/uploads\/2021\/01\/IMG_034520210203-110551-2048x1536.jpg 2048w\" sizes=\"(max-width: 2160px) 100vw, 2160px\" \/><\/p>\n<p>\u7136\u540e\u5c06\u8fd9\u4e24\u4e2aif\u6761\u4ef6\u5408\u5e76\uff0c\u5c31\u53ef\u4ee5\u5f97\u5230 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