{"id":4521,"date":"2019-06-30T11:23:16","date_gmt":"2019-06-30T03:23:16","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=4521"},"modified":"2019-06-30T11:23:16","modified_gmt":"2019-06-30T03:23:16","slug":"%e6%9c%ba%e5%99%a8%e5%ad%a6%e4%b9%a0-%e4%ba%a4%e5%8f%89%e9%aa%8c%e8%af%81","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/4521.html","title":{"rendered":"\u673a\u5668\u5b66\u4e60-\u4ea4\u53c9\u9a8c\u8bc1"},"content":{"rendered":"\n<p>=Start=<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" 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id=\"id-\u6a21\u677f-\u53c2\u8003\u89e3\u7b54\uff1a\">\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n\n\n\n<h6 class=\"wp-block-heading\"><strong>\u4e00\u3001\u8bad\u7ec3\u96c6\uff08training set\uff09\u548c\u6d4b\u8bd5\u96c6\uff08testing set\uff09<\/strong><\/h6>\n\n\n\n<p>\u5728\u6a21\u5f0f\u8bc6\u522b\uff08pattern recognition\uff09\u4e0e\u673a\u5668\u5b66\u4e60\uff08machine learning\uff09\u7684\u76f8\u5173\u7814\u7a76\u4e2d\uff0c\u7ecf\u5e38\u4f1a\u5c06\u6570\u636e\u96c6\uff08dataset\uff09\u5206\u4e3a\u8bad\u7ec3\u96c6\uff08training set\uff09\u8ddf\u6d4b\u8bd5\u96c6\uff08testing set\uff09\u8fd9\u4e24\u4e2a\u5b50\u96c6\uff0c\u524d\u8005\u7528\u4ee5\u5efa\u7acb\u6a21\u578b\uff08model\uff09\uff0c\u540e\u8005\u5219\u7528\u6765\u8bc4\u4f30\u8be5\u6a21\u578b\u5bf9\u672a\u77e5\u6837\u672c\u8fdb\u884c\u9884\u6d4b\u65f6\u7684\u7cbe\u786e\u5ea6\uff0c\u6b63\u89c4\u7684\u8bf4\u6cd5\u662f<strong>\u6cdb\u5316\u80fd\u529b\uff08generalization 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validation\uff09\u662f\u7528\u6765\u9a8c\u8bc1\u5206\u7c7b\u5668\u7684\u6027\u80fd\u4e00\u79cd\u7edf\u8ba1\u5206\u6790\u65b9\u6cd5<\/strong>\uff0c\u57fa\u672c\u601d\u60f3\u662f\u628a\u5728\u67d0\u79cd\u610f\u4e49\u4e0b\u5c06\u539f\u59cb\u6570\u636e\uff08dataset\uff09\u8fdb\u884c\u5206\u7ec4\uff0c\u4e00\u90e8\u5206\u505a\u4e3a\u8bad\u7ec3\u96c6 \uff08training set\uff09\uff0c\u53e6\u4e00\u90e8\u5206\u505a\u4e3a\u9a8c\u8bc1\u96c6\uff08validation set\uff09\uff0c\u9996\u5148\u7528\u8bad\u7ec3\u96c6\u5bf9\u5206\u7c7b\u5668\u8fdb\u884c\u8bad\u7ec3\uff0c\u5728\u5229\u7528\u9a8c\u8bc1\u96c6\u6765\u6d4b\u8bd5\u8bad\u7ec3\u5f97\u5230\u7684\u6a21\u578b\uff08model\uff09\uff0c\u4ee5\u6b64\u6765\u505a\u4e3a\u8bc4\u4ef7\u5206\u7c7b\u5668\u7684\u6027\u80fd\u6307\u6807\u3002\u5e38\u89c1\u7684\u4ea4\u53c9\u9a8c\u8bc1\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">\u7b2c\u4e00\u79cd\uff0c\u7b80\u5355\u4ea4\u53c9\u9a8c\u8bc1<\/h6>\n\n\n\n<p>\u6240\u8c13\u7684\u7b80\u5355\uff0c\u662f\u548c\u5176\u4ed6\u4ea4\u53c9\u9a8c\u8bc1\u65b9\u6cd5\u76f8\u5bf9\u800c\u8a00\u7684\u3002\u9996\u5148\uff0c\u6211\u4eec\u968f\u673a\u7684\u5c06\u6837\u672c\u6570\u636e\u5206\u4e3a\u4e24\u90e8\u5206\uff08\u6bd4\u5982\uff1a 50%\u7684\u8bad\u7ec3\u96c6\uff0c50%\u7684\u9a8c\u8bc1\u96c6\uff09\uff0c\u7136\u540e\u7528\u8bad\u7ec3\u96c6\u6765\u8bad\u7ec3\u6a21\u578b\uff0c\u5728\u9a8c\u8bc1\u96c6\u4e0a\u9a8c\u8bc1\u6a21\u578b\u53ca\u53c2\u6570\u3002\u63a5\u7740\uff0c\u6211\u4eec\u518d\u628a\u6837\u672c\u6253\u4e71\uff0c\u91cd\u65b0\u9009\u62e9\u8bad\u7ec3\u96c6\u548c\u9a8c\u8bc1\u96c6\uff0c\u7ee7\u7eed\u8bad\u7ec3\u6570\u636e\u548c\u68c0\u9a8c\u6a21\u578b\u3002\u6700\u540e\u6211\u4eec\u9009\u62e9\u635f\u5931\u51fd\u6570\u8bc4\u4f30\u6700\u4f18\u7684\u6a21\u578b\u548c\u53c2\u6570\u3002\u3000<\/p>\n\n\n\n<p>\u7279\u70b9\uff1a\u5728\u5206\u5272\u8bad\u7ec3\u96c6\u548c\u9a8c\u8bc1\u96c6\u7684\u65f6\u5019\uff0c\u4e00\u822c\u662f\u968f\u673a\u7684\uff0c\u8fd9\u4e5f\u6b63\u662f\u5bb9\u6613\u51fa\u732b\u817b\u7684\u5730\u65b9\u3002\u540c\u4e00\u4e2a\u6a21\u578b\u548c\u53c2\u6570\uff0c\u5206\u522b\u5728\u4e24\u6b21\u5206\u5272\u4e2d\uff0c\u9a8c\u8bc1\u7ed3\u679c\u53ef\u80fd\u4f1a\u51fa\u73b0\u5f88\u5927\u7684\u5dee\u8ddd\u3002\u6240\u4ee5\uff0c\u4e0d\u592a\u6709\u8bf4\u670d\u529b\u3002<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">\u7b2c\u4e8c\u79cd\uff0cK\u6298\u4ea4\u53c9\u9a8c\u8bc1\uff08K-Folder Cross Validation, K-CV\uff09<\/h6>\n\n\n\n<p>\u548c\u7b2c\u4e00\u79cd\u65b9\u6cd5\u4e0d\u540c\uff0cK\u6298\u4ea4\u53c9\u9a8c\u8bc1\u4f1a\u628a\u6837\u672c\u6570\u636e\u968f\u673a\u7684\u5206\u6210K\u4efd\uff0c\u6bcf\u6b21\u968f\u673a\u7684\u9009\u62e9K-1\u4efd\u4f5c\u4e3a\u8bad\u7ec3\u96c6\uff0c\u5269\u4e0b\u76841\u4efd\u505a\u9a8c\u8bc1\u96c6\u3002\u5f53\u8fd9\u4e00\u8f6e\u5b8c\u6210\u540e\uff0c\u91cd\u65b0\u968f\u673a\u9009\u62e9K-1\u4efd\u6765\u8bad\u7ec3\u6570\u636e\u3002\u82e5\u5e72\u8f6e\uff08\u5c0f\u4e8eK\uff09\u4e4b\u540e\uff0c\u9009\u62e9\u635f\u5931\u51fd\u6570\u8bc4\u4f30\u6700\u4f18\u7684\u6a21\u578b\u548c\u53c2\u6570\u3002<\/p>\n\n\n\n<p>\u7279\u70b9\uff1aK\u4e00\u822c\u5927\u4e8e\u7b49\u4e8e2\uff0c\u5b9e\u9645\u64cd\u4f5c\u65f6\u4e00\u822c\u4ece3\u5f00\u59cb\u53d6\uff0c\u53ea\u6709\u5728\u539f\u59cb\u6570\u636e\u96c6\u5408\u6570\u636e\u91cf\u5c0f\u7684\u65f6\u5019\u624d\u4f1a\u5c1d\u8bd5\u53d6 2\u3002\u5b83\u53ef\u4ee5\u6709\u6548\u7684\u907f\u514d\u8fc7\u62df\u5408\u4ee5\u53ca\u6b20\u62df\u5408\u72b6\u6001\u7684\u53d1\u751f\uff0c\u6700\u540e\u5f97\u5230\u7684\u7ed3\u679c\u4e5f\u6bd4\u8f83\u5177\u6709\u8bf4\u670d\u529b\u3002<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">\u7b2c\u4e09\u79cd\uff0c\u7559\u4e00\u624b\u4ea4\u53c9\u9a8c\u8bc1\uff08Leave-one-out Cross Validation,&nbsp;<strong>LOO-CV<\/strong>\uff09<\/h6>\n\n\n\n<p>\u5b83\u662f\u7b2c\u4e8c\u79cd\u60c5\u51b5\u7684\u7279\u4f8b\uff0c\u6b64\u65f6K\u7b49\u4e8e\u6837\u672c\u6570N\uff0c\u8fd9\u6837\u5bf9\u4e8eN\u4e2a\u6837\u672c\uff0c\u6bcf\u6b21\u9009\u62e9N-1\u4e2a\u6837\u672c\u6765\u8bad\u7ec3\u6570\u636e\uff0c\u7559\u4e00\u4e2a\u6837\u672c\u6765\u9a8c\u8bc1\u6a21\u578b\u9884\u6d4b\u7684\u597d\u574f\u3002\u6b64\u65b9\u6cd5\u4e3b\u8981\u7528\u4e8e\u6837\u672c\u91cf\u975e\u5e38\u5c11\u7684\u60c5\u51b5\uff0c\u6bd4\u5982\u5bf9\u4e8e\u666e\u901a\u9002\u4e2d\u95ee\u9898\uff0cN\u5c0f\u4e8e50\u65f6\uff0c\u6211\u4e00\u822c\u91c7\u7528\u7559\u4e00\u4ea4\u53c9\u9a8c\u8bc1\u3002<\/p>\n\n\n\n<p>\u7279\u70b9\uff1a\u7ed3\u679c\u6bd4\u8f83\u53ef\u9760\u3002\u8fc7\u7a0b\u4e2d\u6ca1\u6709\u968f\u673a\u56e0\u7d20\u4f1a\u5f71\u54cd\u7ed3\u679c\uff0c\u786e\u4fdd\u4e86\u6574\u4e2a\u8fc7\u7a0b\u662f\u53ef\u4ee5\u88ab\u590d\u5236\u7684\u3002<\/p>\n\n\n\n<h6 class=\"wp-block-heading\"><strong>\u4e09\u3001\u4e00\u4e9b\u8865\u5145\u8bf4\u660e<\/strong><\/h6>\n\n\n\n<p>\u4ea4\u53c9\u68c0\u9a8c\u5728\u6df1\u5ea6\u5b66\u4e60\u8dd1\u6807\u51c6\u6570\u636e\u96c6\u7684\u65f6\u5019<strong>\u4e00\u822c\u6839\u672c\u4e0d\u4f1a\u7528\u5230<\/strong>\uff01\uff01<\/p>\n\n\n\n<p>\u5f53\u6570\u636e\u96c6\u6bd4\u8f83\u5c0f\u7684\u65f6\u5019\uff0c\u4ea4\u53c9\u9a8c\u8bc1\u53ef\u4ee5<strong>\u201c\u5145\u5206\u5229\u7528\u201d\u6709\u9650\u7684\u6570\u636e<\/strong>\u627e\u5230\u5408\u9002\u7684\u6a21\u578b\u53c2\u6570\uff0c<strong>\u9632\u6b62\u8fc7\u5ea6\u62df\u5408<\/strong>\u3002\u9002\u7528\u60c5\u51b5\uff1a\u6570\u636e\u96c6\u8f83\u5c0f\u65f6\u3002<\/p>\n\n\n\n<p>\u4f46\u4e00\u822c\u505a\u6df1\u5ea6\u5b66\u4e60\u8dd1\u6807\u51c6\u6570\u636e\u96c6\u7684\u65f6\u5019\u7528\u4e0d\u5230\uff0c\u56e0\u4e3a<strong>\u6570\u636e\u96c6\u8db3\u591f\u5927\uff01\uff01<\/strong><\/p>\n\n\n\n<h5 class=\"wp-block-heading\" id=\"id-\u6a21\u677f-\u53c2\u8003\u94fe\u63a5\uff1a\">\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/mp.weixin.qq.com\/s\/sscPPHwumZrUztuCsrhbZg\">\u4ea4\u53c9\u9a8c\u8bc1(Cross Validation)<\/a><\/li><li><a href=\"https:\/\/blog.csdn.net\/XiaoYi_Eric\/article\/details\/86705101\">\u673a\u5668\u5b66\u4e60\u4e4b\u4ea4\u53c9\u9a8c\u8bc1<\/a><\/li><li><a href=\"https:\/\/www.cnblogs.com\/sddai\/p\/5696834.html\"><strong>\u4ea4\u53c9\u9a8c\u8bc1 Cross-validation<\/strong><\/a><\/li><li><a href=\"https:\/\/morvanzhou.github.io\/tutorials\/machine-learning\/sklearn\/3-2-cross-validation1\/\">\u4ea4\u53c9\u9a8c\u8bc1 1 Cross-validation<\/a><\/li><li><strong>3.1. Cross-validation: evaluating estimator performance<\/strong><br><a href=\"https:\/\/scikit-learn.org\/stable\/modules\/cross_validation.html\">https:\/\/scikit-learn.org\/stable\/modules\/cross_validation.html<\/a><\/li><li><a href=\"https:\/\/zhuanlan.zhihu.com\/p\/24825503\">\u3010\u673a\u5668\u5b66\u4e60\u3011Cross-Validation\uff08\u4ea4\u53c9\u9a8c\u8bc1\uff09\u8be6\u89e3<\/a><\/li><li><a href=\"https:\/\/blog.csdn.net\/xiaodongxiexie\/article\/details\/71915259\">sklearn\u4e2d\u7684\u4ea4\u53c9\u9a8c\u8bc1\uff08Cross-Validation\uff09<\/a><\/li><li><a href=\"https:\/\/www.zhihu.com\/question\/39259296\">\u6c42\u5927\u795e\u901a\u4fd7\u6613\u61c2\u7684\u89e3\u91ca\u4e0b\u4ea4\u53c9\u9a8c\u8bc1cross-validation\uff1f<\/a><\/li><\/ul>\n\n\n\n<p>=END=<\/p>\n","protected":false},"excerpt":{"rendered":"<p>=Start= \u7f18\u7531\uff1a \u5bf9\u4e8e\u6700\u8fd1\u5728\u770b\u5176\u4e2d\u7684\u4e00\u4e9b\u673a\u5668\u5b66\u4e60\u76f8\u5173\u7684\u5185\u5bb9\u65f6\uff0c\u6682\u65f6\u53ea\u5173\u5fc3\u5176\u5927\u81f4\u7684\u539f\u7406\u8bf4\u660e\u548c\u76f8\u5173\u5bf9\u6bd4\uff0c\u5bf9\u4e8e [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,1275],"tags":[1454,1453,9],"class_list":["post-4521","post","type-post","status-publish","format-standard","hentry","category-knowledgebase-2","category-1275","tag-cross-validation","tag-1453","tag-9"],"views":2689,"_links":{"self":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/4521","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/comments?post=4521"}],"version-history":[{"count":1,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/4521\/revisions"}],"predecessor-version":[{"id":4522,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/4521\/revisions\/4522"}],"wp:attachment":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/media?parent=4521"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/categories?post=4521"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/tags?post=4521"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}