{"id":322,"date":"2016-05-15T03:37:42","date_gmt":"2016-05-15T03:37:42","guid":{"rendered":"http:\/\/blogs.softwareclue.com\/?p=322"},"modified":"2016-05-15T03:37:42","modified_gmt":"2016-05-15T03:37:42","slug":"%e6%9c%ba%e5%99%a8%e5%ad%a6%e4%b9%a0%e5%b8%b8%e8%a7%81%e9%9d%a2%e8%af%95%e9%a2%98%e6%95%b4%e7%90%86","status":"publish","type":"post","link":"http:\/\/blog.softwareclues.com\/zh\/%e6%9c%ba%e5%99%a8%e5%ad%a6%e4%b9%a0%e5%b8%b8%e8%a7%81%e9%9d%a2%e8%af%95%e9%a2%98%e6%95%b4%e7%90%86","title":{"rendered":"\u673a\u5668\u5b66\u4e60\u5e38\u89c1\u9762\u8bd5\u9898\u6574\u7406"},"content":{"rendered":"<p>By:<b>kubiCode<\/b><\/p>\n<p>Source:<a href=\"http:\/\/kubicode.me\/2015\/08\/16\/Machine%20Learning\/Common-Interview\/\" target=\"_blank\"> http:\/\/kubicode.me\/2015\/08\/16\/Machine%20Learning\/Common-Interview\/<\/a><\/p>\n<h2 id=\"\u6709\u76d1\u7763\u5b66\u4e60\u548c\u65e0\u76d1\u7763\u5b66\u4e60\u7684\u533a\u522b\">\u6709\u76d1\u7763\u5b66\u4e60\u548c\u65e0\u76d1\u7763\u5b66\u4e60\u7684\u533a\u522b<\/h2>\n<ul>\n<li>\u6709\u76d1\u7763\u5b66\u4e60\uff1a\u5bf9\u5177\u6709\u6807\u8bb0\u7684\u8bad\u7ec3\u6837\u672c\u8fdb\u884c\u5b66\u4e60\uff0c\u4ee5\u5c3d\u53ef\u80fd\u5bf9\u8bad\u7ec3\u6837\u672c\u96c6\u5916\u7684\u6570\u636e\u8fdb\u884c\u5206\u7c7b\u9884\u6d4b\u3002\uff08LR,SVM,BP,RF,GBRT\uff09<\/li>\n<li>\u65e0\u76d1\u7763\u5b66\u4e60\uff1a\u5bf9\u672a\u6807\u8bb0\u7684\u6837\u672c\u8fdb\u884c\u8bad\u7ec3\u5b66\u4e60\uff0c\u6bd4\u53d1\u73b0\u8fd9\u4e9b\u6837\u672c\u4e2d\u7684\u7ed3\u6784\u77e5\u8bc6\u3002(KMeans,DL)<\/li>\n<\/ul>\n<h2 id=\"\u6b63\u5219\u5316\">\u6b63\u5219\u5316<\/h2>\n<p>\u6b63\u5219\u5316\u662f\u9488\u5bf9\u8fc7\u62df\u5408\u800c\u63d0\u51fa\u7684\uff0c\u4ee5\u4e3a\u5728\u6c42\u89e3\u6a21\u578b\u6700\u4f18\u7684\u662f\u4e00\u822c\u4f18\u5316\u6700\u5c0f\u7684\u7ecf\u9a8c\u98ce\u9669\uff0c\u73b0\u5728\u5728\u8be5\u7ecf\u9a8c\u98ce\u9669\u4e0a\u52a0\u5165 \u6a21\u578b\u590d\u6742\u5ea6\u8fd9\u4e00\u9879\uff08\u6b63\u5219\u5316\u9879\u662f\u6a21\u578b\u53c2\u6570\u5411\u91cf\u7684\u8303\u6570\uff09\uff0c\u5e76\u4f7f\u7528\u4e00\u4e2arate\u6bd4\u7387\u6765\u6743\u8861\u6a21\u578b\u590d\u6742\u5ea6\u4e0e\u4ee5\u5f80\u7ecf\u9a8c\u98ce\u9669\u7684\u6743\u91cd\uff0c\u5982\u679c\u6a21\u578b\u590d\u6742\u5ea6\u8d8a\u9ad8\uff0c\u7ed3\u6784\u5316\u7684\u7ecf\u9a8c\u98ce \u9669\u4f1a\u8d8a\u5927\uff0c\u73b0\u5728\u7684\u76ee\u6807\u5c31\u53d8\u4e3a\u4e86\u7ed3\u6784\u7ecf\u9a8c\u98ce\u9669\u7684\u6700\u4f18\u5316\uff0c\u53ef\u4ee5\u9632\u6b62\u6a21\u578b\u8bad\u7ec3\u8fc7\u5ea6\u590d\u6742\uff0c\u6709\u6548\u7684\u964d\u4f4e\u8fc7\u62df\u5408\u7684\u98ce\u9669\u3002<\/p>\n<blockquote><p>\u5965\u5361\u59c6\u5243\u5200\u539f\u7406\uff0c\u80fd\u591f\u5f88\u597d\u7684\u89e3\u91ca\u5df2\u77e5\u6570\u636e\u5e76\u4e14\u5341\u5206\u7b80\u5355\u624d\u662f\u6700\u597d\u7684\u6a21\u578b\u3002<\/p><\/blockquote>\n<h2 id=\"\u8fc7\u62df\u5408\">\u8fc7\u62df\u5408<\/h2>\n<p>\u5982\u679c\u4e00\u5473\u7684\u53bb\u63d0\u9ad8\u8bad\u7ec3\u6570\u636e\u7684\u9884\u6d4b\u80fd\u529b\uff0c\u6240\u9009\u6a21\u578b\u7684\u590d\u6742\u5ea6\u5f80\u5f80\u4f1a\u5f88\u9ad8\uff0c\u8fd9\u79cd\u73b0\u8c61\u79f0\u4e3a\u8fc7\u62df\u5408\u3002\u6240\u8868\u73b0\u7684\u5c31\u662f\u6a21\u578b\u8bad\u7ec3\u65f6\u5019\u7684\u8bef\u5dee\u5f88\u5c0f\uff0c\u4f46\u5728\u6d4b\u8bd5\u7684\u65f6\u5019\u8bef\u5dee\u5f88\u5927\u3002<\/p>\n<h3 id=\"\u4ea7\u751f\u7684\u539f\u56e0\">\u4ea7\u751f\u7684\u539f\u56e0<\/h3>\n<ol>\n<li>\u56e0\u4e3a\u53c2\u6570\u592a\u591a\uff0c\u4f1a\u5bfc\u81f4\u6211\u4eec\u7684\u6a21\u578b\u590d\u6742\u5ea6\u4e0a\u5347\uff0c\u5bb9\u6613\u8fc7\u62df\u5408<\/li>\n<li>\u6743\u503c\u5b66\u4e60\u8fed\u4ee3\u6b21\u6570\u8db3\u591f\u591a(Overtraining),\u62df\u5408\u4e86\u8bad\u7ec3\u6570\u636e\u4e2d\u7684\u566a\u58f0\u548c\u8bad\u7ec3\u6837\u4f8b\u4e2d\u6ca1\u6709\u4ee3\u8868\u6027\u7684\u7279\u5f81.<\/li>\n<\/ol>\n<h3 id=\"\u89e3\u51b3\u65b9\u6cd5\">\u89e3\u51b3\u65b9\u6cd5<\/h3>\n<ol>\n<li>\u4ea4\u53c9\u9a8c\u8bc1\u6cd5<\/li>\n<li>\u51cf\u5c11\u7279\u5f81<\/li>\n<li>\u6b63\u5219\u5316<\/li>\n<li>\u6743\u503c\u8870\u51cf<\/li>\n<li>\u9a8c\u8bc1\u6570\u636e<\/li>\n<\/ol>\n<h2 id=\"\u6cdb\u5316\u80fd\u529b\">\u6cdb\u5316\u80fd\u529b<\/h2>\n<p>\u6cdb\u5316\u80fd\u529b\u662f\u6307\u6a21\u578b\u5bf9\u672a\u77e5\u6570\u636e\u7684\u9884\u6d4b\u80fd\u529b<\/p>\n<h2 id=\"\u751f\u6210\u6a21\u578b\u548c\u5224\u522b\u6a21\u578b\">\u751f\u6210\u6a21\u578b\u548c\u5224\u522b\u6a21\u578b<\/h2>\n<ol>\n<li>\u751f\u6210\u6a21\u578b\uff1a\u7531\u6570\u636e\u5b66\u4e60\u8054\u5408\u6982\u7387\u5206\u5e03P(X,Y)\uff0c\u7136\u540e\u6c42\u51fa\u6761\u4ef6\u6982\u7387\u5206\u5e03P(Y|X)\u4f5c\u4e3a\u9884\u6d4b\u7684\u6a21\u578b\uff0c\u5373\u751f\u6210\u6a21\u578b\uff1aP(Y|X)= P(X,Y)\/ P(X)\u3002\uff08\u6734\u7d20\u8d1d\u53f6\u65af\uff09<br \/>\n\u751f\u6210\u6a21\u578b\u53ef\u4ee5\u8fd8\u539f\u8054\u5408\u6982\u7387\u5206\u5e03p(X,Y)\uff0c\u5e76\u4e14\u6709\u8f83\u5feb\u7684\u5b66\u4e60\u6536\u655b\u901f\u5ea6\uff0c\u8fd8\u53ef\u4ee5\u7528\u4e8e\u9690\u53d8\u91cf\u7684\u5b66\u4e60<\/li>\n<li>\u5224\u522b\u6a21\u578b\uff1a\u7531\u6570\u636e\u76f4\u63a5\u5b66\u4e60\u51b3\u7b56\u51fd\u6570Y=f(X)\u6216\u8005\u6761\u4ef6\u6982\u7387\u5206\u5e03P(Y|X)\u4f5c\u4e3a\u9884\u6d4b\u7684\u6a21\u578b\uff0c\u5373\u5224\u522b\u6a21\u578b\u3002\uff08k\u8fd1\u90bb\u3001\u51b3\u7b56\u6811\uff09<br \/>\n\u76f4\u63a5\u9762\u5bf9\u9884\u6d4b\uff0c\u5f80\u5f80\u51c6\u786e\u7387\u8f83\u9ad8\uff0c\u76f4\u63a5\u5bf9\u6570\u636e\u5728\u5404\u79cd\u7a0b\u5ea6\u4e0a\u7684\u62bd\u8c61\uff0c\u6240\u4ee5\u53ef\u4ee5\u7b80\u5316\u6a21\u578b<\/li>\n<\/ol>\n<h2 id=\"\u7ebf\u6027\u5206\u7c7b\u5668\u4e0e\u975e\u7ebf\u6027\u5206\u7c7b\u5668\u7684\u533a\u522b\u4ee5\u53ca\u4f18\u52a3\">\u7ebf\u6027\u5206\u7c7b\u5668\u4e0e\u975e\u7ebf\u6027\u5206\u7c7b\u5668\u7684\u533a\u522b\u4ee5\u53ca\u4f18\u52a3<\/h2>\n<p>\u5982\u679c\u6a21\u578b\u662f\u53c2\u6570\u7684\u7ebf\u6027\u51fd\u6570\uff0c\u5e76\u4e14\u5b58\u5728\u7ebf\u6027\u5206\u7c7b\u9762\uff0c\u90a3\u4e48\u5c31\u662f\u7ebf\u6027\u5206\u7c7b\u5668\uff0c\u5426\u5219\u4e0d\u662f\u3002<br \/>\n\u5e38\u89c1\u7684\u7ebf\u6027\u5206\u7c7b\u5668\u6709\uff1aLR,\u8d1d\u53f6\u65af\u5206\u7c7b\uff0c\u5355\u5c42\u611f\u77e5\u673a\u3001\u7ebf\u6027\u56de\u5f52<br \/>\n\u5e38\u89c1\u7684\u975e\u7ebf\u6027\u5206\u7c7b\u5668\uff1a\u51b3\u7b56\u6811\u3001RF\u3001GBDT\u3001\u591a\u5c42\u611f\u77e5\u673a<\/p>\n<blockquote><p>SVM\u4e24\u79cd\u90fd\u6709(\u770b\u7ebf\u6027\u6838\u8fd8\u662f\u9ad8\u65af\u6838)<\/p><\/blockquote>\n<ul>\n<li>\u7ebf\u6027\u5206\u7c7b\u5668\u901f\u5ea6\u5feb\u3001\u7f16\u7a0b\u65b9\u4fbf\uff0c\u4f46\u662f\u53ef\u80fd\u62df\u5408\u6548\u679c\u4e0d\u4f1a\u5f88\u597d<\/li>\n<li>\u975e\u7ebf\u6027\u5206\u7c7b\u5668\u7f16\u7a0b\u590d\u6742\uff0c\u4f46\u662f\u6548\u679c\u62df\u5408\u80fd\u529b\u5f3a<\/li>\n<\/ul>\n<h3 id=\"\u7279\u5f81\u6bd4\u6570\u636e\u91cf\u8fd8\u5927\u65f6\uff0c\u9009\u62e9\u4ec0\u4e48\u6837\u7684\u5206\u7c7b\u5668\uff1f\">\u7279\u5f81\u6bd4\u6570\u636e\u91cf\u8fd8\u5927\u65f6\uff0c\u9009\u62e9\u4ec0\u4e48\u6837\u7684\u5206\u7c7b\u5668\uff1f<\/h3>\n<p>\u7ebf\u6027\u5206\u7c7b\u5668\uff0c\u56e0\u4e3a\u7ef4\u5ea6\u9ad8\u7684\u65f6\u5019\uff0c\u6570\u636e\u4e00\u822c\u5728\u7ef4\u5ea6\u7a7a\u95f4\u91cc\u9762\u4f1a\u6bd4\u8f83\u7a00\u758f\uff0c\u5f88\u6709\u53ef\u80fd\u7ebf\u6027\u53ef\u5206<\/p>\n<h3 id=\"\u5bf9\u4e8e\u7ef4\u5ea6\u5f88\u9ad8\u7684\u7279\u5f81\uff0c\u4f60\u662f\u9009\u62e9\u7ebf\u6027\u8fd8\u662f\u975e\u7ebf\u6027\u5206\u7c7b\u5668\uff1f\">\u5bf9\u4e8e\u7ef4\u5ea6\u5f88\u9ad8\u7684\u7279\u5f81\uff0c\u4f60\u662f\u9009\u62e9\u7ebf\u6027\u8fd8\u662f\u975e\u7ebf\u6027\u5206\u7c7b\u5668\uff1f<\/h3>\n<p>\u7406\u7531\u540c\u4e0a<\/p>\n<h3 id=\"\u5bf9\u4e8e\u7ef4\u5ea6\u6781\u4f4e\u7684\u7279\u5f81\uff0c\u4f60\u662f\u9009\u62e9\u7ebf\u6027\u8fd8\u662f\u975e\u7ebf\u6027\u5206\u7c7b\u5668\uff1f\">\u5bf9\u4e8e\u7ef4\u5ea6\u6781\u4f4e\u7684\u7279\u5f81\uff0c\u4f60\u662f\u9009\u62e9\u7ebf\u6027\u8fd8\u662f\u975e\u7ebf\u6027\u5206\u7c7b\u5668\uff1f<\/h3>\n<p>\u975e\u7ebf\u6027\u5206\u7c7b\u5668\uff0c\u56e0\u4e3a\u4f4e\u7ef4\u7a7a\u95f4\u53ef\u80fd\u5f88\u591a\u7279\u5f81\u90fd\u8dd1\u5230\u4e00\u8d77\u4e86\uff0c\u5bfc\u81f4\u7ebf\u6027\u4e0d\u53ef\u5206<\/p>\n<h2 id=\"ill-condition\u75c5\u6001\u95ee\u9898\">ill-condition\u75c5\u6001\u95ee\u9898<\/h2>\n<p>\u8bad\u7ec3\u5b8c\u7684\u6a21\u578b\u6d4b\u8bd5\u6837\u672c\u7a0d\u4f5c\u4fee\u6539\u5c31\u4f1a\u5f97\u5230\u5dee\u522b\u5f88\u5927\u7684\u7ed3\u679c\uff0c\u5c31\u662f\u75c5\u6001\u95ee\u9898\uff08\u8fd9\u7b80\u76f4\u662f\u4e0d\u80fd\u7528\u554a\uff09<\/p>\n<h2 id=\"L1\u548cL2\u6b63\u5219\u7684\u533a\u522b\uff0c\u5982\u4f55\u9009\u62e9L1\u548cL2\u6b63\u5219\">L1\u548cL2\u6b63\u5219\u7684\u533a\u522b\uff0c\u5982\u4f55\u9009\u62e9L1\u548cL2\u6b63\u5219<\/h2>\n<blockquote><p>\u4ed6\u4eec\u90fd\u662f\u53ef\u4ee5\u9632\u6b62\u8fc7\u62df\u5408\uff0c\u964d\u4f4e\u6a21\u578b\u590d\u6742\u5ea6<\/p><\/blockquote>\n<ul>\n<li>L1\u662f\u5728loss function\u540e\u9762\u52a0\u4e0a \u6a21\u578b\u53c2\u6570\u76841\u8303\u6570\uff08\u4e5f\u5c31\u662f|xi|\uff09<\/li>\n<li>L2\u662f\u5728loss function\u540e\u9762\u52a0\u4e0a \u6a21\u578b\u53c2\u6570\u76842\u8303\u6570\uff08\u4e5f\u5c31\u662fsigma(xi^2)\uff09\uff0c\u6ce8\u610fL2\u8303\u6570\u7684\u5b9a\u4e49\u662fsqrt(sigma(xi^2))\uff0c\u5728\u6b63\u5219\u9879\u4e0a\u6ca1\u6709\u6dfb\u52a0sqrt\u6839\u53f7\u662f\u4e3a\u4e86\u66f4\u52a0\u5bb9\u6613\u4f18\u5316<\/li>\n<li>L1 \u4f1a\u4ea7\u751f\u7a00\u758f\u7684\u7279\u5f81<\/li>\n<li>L2 \u4f1a\u4ea7\u751f\u66f4\u591a\u5730\u7279\u5f81\u4f46\u662f\u90fd\u4f1a\u63a5\u8fd1\u4e8e0<\/li>\n<\/ul>\n<p>L1\u4f1a\u8d8b\u5411\u4e8e\u4ea7\u751f\u5c11\u91cf\u7684\u7279\u5f81\uff0c\u800c\u5176\u4ed6\u7684\u7279\u5f81\u90fd\u662f0\uff0c\u800cL2\u4f1a\u9009\u62e9\u66f4\u591a\u7684\u7279\u5f81\uff0c\u8fd9\u4e9b\u7279\u5f81\u90fd\u4f1a\u63a5\u8fd1\u4e8e0\u3002L1\u5728\u7279\u5f81\u9009\u62e9\u65f6\u5019\u975e\u5e38\u6709\u7528\uff0c\u800cL2\u5c31\u53ea\u662f\u4e00\u79cd\u89c4\u5219\u5316\u800c\u5df2\u3002<\/p>\n<h2 id=\"\u7279\u5f81\u5411\u91cf\u7684\u5f52\u4e00\u5316\u65b9\u6cd5\">\u7279\u5f81\u5411\u91cf\u7684\u5f52\u4e00\u5316\u65b9\u6cd5<\/h2>\n<ol>\n<li>\u7ebf\u6027\u51fd\u6570\u8f6c\u6362\uff0c\u8868\u8fbe\u5f0f\u5982\u4e0b\uff1ay=(x-MinValue)\/(MaxValue-MinValue)<\/li>\n<li>\u5bf9\u6570\u51fd\u6570\u8f6c\u6362\uff0c\u8868\u8fbe\u5f0f\u5982\u4e0b\uff1ay=log10 (x)<\/li>\n<li>\u53cd\u4f59\u5207\u51fd\u6570\u8f6c\u6362 \uff0c\u8868\u8fbe\u5f0f\u5982\u4e0b\uff1ay=arctan(x)*2\/PI<\/li>\n<li>\u51cf\u53bb\u5747\u503c\uff0c\u4e58\u4ee5\u65b9\u5dee\uff1ay=(x-means)\/ variance<\/li>\n<\/ol>\n<h2 id=\"\u7279\u5f81\u5411\u91cf\u7684\u5f02\u5e38\u503c\u5904\u7406\">\u7279\u5f81\u5411\u91cf\u7684\u5f02\u5e38\u503c\u5904\u7406<\/h2>\n<ol>\n<li>\u7528\u5747\u503c\u6216\u8005\u5176\u4ed6\u7edf\u8ba1\u91cf\u4ee3\u66ff<\/li>\n<\/ol>\n<h2 id=\"\u8d8a\u5c0f\u7684\u53c2\u6570\u8bf4\u660e\u6a21\u578b\u8d8a\u7b80\u5355\">\u8d8a\u5c0f\u7684\u53c2\u6570\u8bf4\u660e\u6a21\u578b\u8d8a\u7b80\u5355<\/h2>\n<p>\u8fc7\u62df\u5408\u7684\uff0c\u62df\u5408\u4f1a\u7ecf\u8fc7\u66f2\u9762\u7684\u6bcf\u4e2a\u70b9\uff0c\u4e5f\u5c31\u662f\u8bf4\u5728\u8f83\u5c0f\u7684\u533a\u95f4\u91cc\u9762\u53ef\u80fd\u4f1a\u6709\u8f83\u5927\u7684\u66f2\u7387\uff0c\u8fd9\u91cc\u7684\u5bfc\u6570\u5c31\u662f\u5f88\u5927\uff0c\u7ebf\u6027\u6a21\u578b\u91cc\u9762\u7684\u6743\u503c\u5c31\u662f\u5bfc\u6570\uff0c\u6240\u4ee5\u8d8a\u5c0f\u7684\u53c2\u6570\u8bf4\u660e\u6a21\u578b\u8d8a\u7b80\u5355\u3002<\/p>\n<blockquote><p>\u8ffd\u52a0\uff1a\u8fd9\u4e2a\u5176\u5b9e\u53ef\u4ee5\u770bVC\u7ef4\u76f8\u5173\u7684\u4e1c\u897f\u611f\u89c9\u66f4\u52a0\u5408\u9002<\/p><\/blockquote>\n<h2 id=\"svm\u4e2drbf\u6838\u51fd\u6570\u4e0e\u9ad8\u65af\u548c\u51fd\u6570\u7684\u6bd4\u8f83\">svm\u4e2drbf\u6838\u51fd\u6570\u4e0e\u9ad8\u65af\u548c\u51fd\u6570\u7684\u6bd4\u8f83<\/h2>\n<p>\u9ad8\u65af\u6838\u51fd\u6570\u597d\u50cf\u662fRBF\u6838\u7684\u4e00\u79cd<\/p>\n<h2 id=\"KMeans\u521d\u59cb\u7c7b\u7c07\u4e2d\u5fc3\u70b9\u7684\u9009\u53d6\">KMeans\u521d\u59cb\u7c7b\u7c07\u4e2d\u5fc3\u70b9\u7684\u9009\u53d6<\/h2>\n<h3 id=\"\u9009\u62e9\u6279\u6b21\u8ddd\u79bb\u5c3d\u53ef\u80fd\u8fdc\u7684K\u4e2a\u70b9\">\u9009\u62e9\u6279\u6b21\u8ddd\u79bb\u5c3d\u53ef\u80fd\u8fdc\u7684K\u4e2a\u70b9<\/h3>\n<pre><code>\u9996\u5148\u968f\u673a\u9009\u53d6\u4e00\u4e2a\u70b9\u4f5c\u4e3a\u521d\u59cb\u70b9\uff0c\u7136\u540e\u9009\u62e9\u8ddd\u79bb\u4e0e\u8be5\u70b9\u6700\u8fdc\u7684\u90a3\u4e2a\u70b9\u4f5c\u4e3a\u4e2d\u5fc3\u70b9\uff0c\u518d\u9009\u62e9\u8ddd\u79bb\u4e0e\u524d\u4e24\u4e2a\u70b9\u6700\u8fdc\u7684\u5e97\u4f5c\u4e3a\u7b2c\u4e09\u4e2a\u4e2d\u5fc3\u5e97\uff0c\u4ee5\u6b64\u7c7b\u63a8\uff0c\u76f4\u81f3\u9009\u53d6\u5927k\u4e2a\r\n<\/code><\/pre>\n<h3 id=\"\u9009\u7528\u5c42\u6b21\u805a\u7c7b\u6216\u8005Canopy\u7b97\u6cd5\u8fdb\u884c\u521d\u59cb\u805a\u7c7b\">\u9009\u7528\u5c42\u6b21\u805a\u7c7b\u6216\u8005Canopy\u7b97\u6cd5\u8fdb\u884c\u521d\u59cb\u805a\u7c7b<\/h3>\n<h2 id=\"ROC\u3001AUC\">ROC\u3001AUC<\/h2>\n<p>ROC\u548cAUC\u901a\u5e38\u662f\u7528\u6765\u8bc4\u4ef7\u4e00\u4e2a\u4e8c\u503c\u5206\u7c7b\u5668\u7684\u597d\u574f<\/p>\n<h3 id=\"ROC\u66f2\u7ebf\">ROC\u66f2\u7ebf<\/h3>\n<p>\u66f2\u7ebf\u5750\u6807\u4e0a\uff1a<\/p>\n<ul>\n<li>X\u8f74\u662fFPR\uff08\u8868\u793a\u5047\u9633\u7387-\u9884\u6d4b\u7ed3\u679c\u4e3apositive\uff0c\u4f46\u662f\u5b9e\u9645\u7ed3\u679c\u4e3anegitive\uff0cFP\/(N)\uff09<\/li>\n<li>Y\u8f74\u5f0fTPR\uff08\u8868\u793a\u771f\u9633\u7387-\u9884\u6d4b\u7ed3\u679c\u4e3apositive\uff0c\u800c\u4e14\u7684\u786e\u771f\u5b9e\u7ed3\u679c\u4e5f\u4e3apositive\u7684,TP\/P\uff09<\/li>\n<\/ul>\n<p>\u90a3\u4e48\u5e73\u9762\u7684\u4e0a\u70b9(X,Y)\uff1a<\/p>\n<ul>\n<li>(0,1)\u8868\u793a\u6240\u6709\u7684positive\u7684\u6837\u672c\u90fd\u9884\u6d4b\u51fa\u6765\u4e86\uff0c\u5206\u7c7b\u6548\u679c\u6700\u597d<\/li>\n<li>(0,0)\u8868\u793a\u9884\u6d4b\u7684\u7ed3\u679c\u5168\u90e8\u4e3anegitive<\/li>\n<li>(1,0)\u8868\u793a\u9884\u6d4b\u7684\u9519\u8fc7\u5168\u90e8\u5206\u9519\u4e86\uff0c\u5206\u7c7b\u6548\u679c\u6700\u5dee<\/li>\n<li>(1,1)\u8868\u793a\u9884\u6d4b\u7684\u7ed3\u679c\u5168\u90e8\u4e3apositive<br \/>\n<blockquote><p>\u9488\u5bf9\u843d\u5728x=y\u4e0a\u70b9\uff0c\u8868\u793a\u662f\u91c7\u7528\u968f\u673a\u731c\u6d4b\u51fa\u6765\u7684\u7ed3\u679c<\/p><\/blockquote>\n<\/li>\n<\/ul>\n<p>ROC\u66f2\u7ebf\u5efa\u7acb<br \/>\n\u4e00\u822c\u9ed8\u8ba4\u9884\u6d4b\u5b8c\u6210\u4e4b\u540e\u4f1a\u6709\u4e00\u4e2a\u6982\u7387\u8f93\u51fap\uff0c\u8fd9\u4e2a\u6982\u7387\u8d8a\u9ad8\uff0c\u8868\u793a\u5b83\u5bf9positive\u7684\u6982\u7387\u8d8a\u5927\u3002<br \/>\n\u73b0\u5728\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a threshold\uff0c\u5982\u679cp&gt;threshold\uff0c\u90a3\u4e48\u8be5\u9884\u6d4b\u7ed3\u679c\u4e3apositive\uff0c\u5426\u5219\u4e3anegitive\uff0c\u6309\u7167\u8fd9\u4e2a\u601d\u8def\uff0c\u6211\u4eec\u591a\u8bbe\u7f6e\u51e0\u4e2a threshold,\u90a3\u4e48\u6211\u4eec\u5c31\u53ef\u4ee5\u5f97\u5230\u591a\u7ec4positive\u548cnegitive\u7684\u7ed3\u679c\u4e86\uff0c\u4e5f\u5c31\u662f\u6211\u4eec\u53ef\u4ee5\u5f97\u5230\u591a\u7ec4FPR\u548cTPR\u503c\u4e86<br \/>\n\u5c06\u8fd9\u4e9b(FPR,TPR)\u70b9\u6295\u5c04\u5230\u5750\u6807\u4e0a\u518d\u7528\u7ebf\u8fde\u63a5\u8d77\u6765\u5c31\u662fROC\u66f2\u7ebf\u4e86<\/p>\n<blockquote><p>\u5f53threshold\u53d61\u548c0\u65f6\uff0c\u5206\u522b\u5f97\u5230\u7684\u5c31\u662f(0,0)\u548c(1,1)\u8fd9\u4e24\u4e2a\u70b9\u3002\uff08threshold=1\uff0c\u9884\u6d4b\u7684\u6837\u672c\u5168\u90e8\u4e3a\u8d1f\u6837\u672c\uff0cthreshold=0\uff0c\u9884\u6d4b\u7684\u6837\u672c\u5168\u90e8\u4e3a\u6b63\u6837\u672c\uff09<\/p><\/blockquote>\n<h3 id=\"AUC\">AUC<\/h3>\n<p>AUC(Area Under Curve)\u88ab\u5b9a\u4e49\u4e3aROC\u66f2\u7ebf\u4e0b\u7684\u9762\u79ef\uff0c\u663e\u7136\u8fd9\u4e2a\u9762\u79ef\u4e0d\u4f1a\u5927\u4e8e1\uff08\u4e00\u822c\u60c5\u51b5\u4e0bROC\u4f1a\u5728x=y\u7684\u4e0a\u65b9\uff0c\u6240\u4ee50.5&lt;AUC&lt;1\uff09.<\/p>\n<blockquote><p>AUC\u8d8a\u5927\u8bf4\u660e\u5206\u7c7b\u6548\u679c\u8d8a\u597d<\/p><\/blockquote>\n<h3 id=\"\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528ROC\u548cAUC\">\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528ROC\u548cAUC<\/h3>\n<p>\u56e0\u4e3a\u5f53\u6d4b\u8bd5\u96c6\u4e2d\u7684\u6b63\u8d1f\u6837\u672c\u53d1\u751f\u53d8\u5316\u65f6\uff0cROC\u66f2\u7ebf\u80fd\u57fa\u672c\u4fdd\u6301\u4e0d\u53d8\uff0c\u4f46\u662fprecision\u548crecall\u53ef\u80fd\u5c31\u4f1a\u6709\u8f83\u5927\u7684\u6ce2\u52a8\u3002<br \/>\n<a href=\"http:\/\/www.douban.com\/note\/284051363\/?type=like\" target=\"_blank\" rel=\"external\">http:\/\/www.douban.com\/note\/284051363\/?type=like<\/a><\/p>\n<h2 id=\"\u6d4b\u8bd5\u96c6\u548c\u8bad\u7ec3\u96c6\u7684\u533a\u522b\">\u6d4b\u8bd5\u96c6\u548c\u8bad\u7ec3\u96c6\u7684\u533a\u522b<\/h2>\n<p>\u8bad\u7ec3\u96c6\u7528\u4e8e\u5efa\u7acb\u6a21\u578b,\u6d4b\u8bd5\u96c6\u8bc4\u4f30\u6a21\u578b\u7684\u9884\u6d4b\u7b49\u80fd\u529b<\/p>\n<h2 id=\"\u4f18\u5316Kmeans\">\u4f18\u5316Kmeans<\/h2>\n<p>\u4f7f\u7528kd\u6811\u6216\u8005ball tree(\u8fd9\u4e2a\u6811\u4e0d\u61c2)<br \/>\n\u5c06\u6240\u6709\u7684\u89c2\u6d4b\u5b9e\u4f8b\u6784\u5efa\u6210\u4e00\u9897kd\u6811\uff0c\u4e4b\u524d\u6bcf\u4e2a\u805a\u7c7b\u4e2d\u5fc3\u90fd\u662f\u9700\u8981\u548c\u6bcf\u4e2a\u89c2\u6d4b\u70b9\u505a\u4f9d\u6b21\u8ddd\u79bb\u8ba1\u7b97\uff0c\u73b0\u5728\u8fd9\u4e9b\u805a\u7c7b\u4e2d\u5fc3\u6839\u636ekd\u6811\u53ea\u9700\u8981\u8ba1\u7b97\u9644\u8fd1\u7684\u4e00\u4e2a\u5c40\u90e8\u533a\u57df\u5373\u53ef<\/p>\n<h2 id=\"\u6570\u636e\u6316\u6398\u548c\u673a\u5668\u5b66\u4e60\u7684\u533a\u522b\">\u6570\u636e\u6316\u6398\u548c\u673a\u5668\u5b66\u4e60\u7684\u533a\u522b<\/h2>\n<p>\u673a\u5668\u5b66\u4e60\u662f\u6570\u636e\u6316\u6398\u7684\u4e00\u4e2a\u91cd\u8981\u5de5\u5177\uff0c\u4f46\u662f\u6570\u636e\u6316\u6398\u4e0d\u4ec5\u4ec5\u53ea\u6709\u673a\u5668\u5b66\u4e60\u8fd9\u4e00\u7c7b\u65b9\u6cd5\uff0c\u8fd8\u6709\u5176\u4ed6\u5f88\u591a\u975e\u673a\u5668\u5b66\u4e60\u7684\u65b9\u6cd5\uff0c\u6bd4\u5982\u56fe\u6316\u6398\uff0c\u9891\u7e41\u9879\u6316\u6398\u7b49\u3002\u611f\u89c9\u6570\u636e\u6316\u6398\u662f\u4ece\u76ee\u7684\u800c\u8a00\u7684\uff0c\u4f46\u662f\u673a\u5668\u5b66\u4e60\u662f\u4ece\u65b9\u6cd5\u800c\u8a00\u7684\u3002<\/p>\n<h2 id=\"\u5907\u6ce8\">\u5907\u6ce8<\/h2>\n<p>\u9898\u76ee\u4e3b\u8981\u6765\u6e90\u4e8e\u7f51\u7edc\uff0c\u7b54\u6848\u4e3b\u8981\u6765\u6e90\u4e8e\u7f51\u7edc\u6216\u8005\u300a\u7edf\u8ba1\u5b66\u4e60\u65b9\u6cd5\u300b\uff0c\u8fd8\u6709\u81ea\u5df1\u4e00\u5c0f\u90e8\u5206\u7684\u603b\u7ed3\uff0c\u5982\u679c\u9519\u8bef\u4e4b\u5904\u656c\u8bf7\u6307\u51fa<br \/>\n\u5982\u679c\u60f3\u8981\u4e86\u89e3\u5173\u4e8e\u5e38\u89c1\u6a21\u578b\u7684\u4e1c\u4e1c\u53ef\u4ee5\u770b\u8fd9\u7bc7<a href=\"http:\/\/kubicode.me\/2015\/08\/16\/Machine%20Learning\/Algorithm-Summary-for-Interview\/\" target=\"_blank\" rel=\"external\">\u673a\u5668\u5b66\u4e60\u5e38\u89c1\u7b97\u6cd5\u4e2a\u4eba\u603b\u7ed3\uff08\u9762\u8bd5\u7528\uff09<\/a>\u6587\u7ae0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>By:kubiCode Source: http:\/\/kubicode.me\/2015\/08\/16\/Machi &hellip; <a href=\"http:\/\/blog.softwareclues.com\/zh\/%e6%9c%ba%e5%99%a8%e5%ad%a6%e4%b9%a0%e5%b8%b8%e8%a7%81%e9%9d%a2%e8%af%95%e9%a2%98%e6%95%b4%e7%90%86\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span 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