{"id":1221,"date":"2014-05-05T13:12:00","date_gmt":"2014-05-05T05:12:00","guid":{"rendered":"http:\/\/blog.dayandcarrot.net\/?p=1221"},"modified":"2014-05-05T13:12:00","modified_gmt":"2014-05-05T05:12:00","slug":"%e5%8f%ac%e5%9b%9e%e7%8e%87-recall%e3%80%81%e7%b2%be%e7%a1%ae%e5%ba%a6precision%e3%80%81%e5%87%86%e7%a1%ae%e7%8e%87accuracy%e3%80%81%e8%99%9a%e8%ad%a6%e3%80%81%e6%bc%8f%e8%ad%a6%e7%ad%89%e5%88%86","status":"publish","type":"post","link":"https:\/\/dayandcarrot.space\/?p=1221","title":{"rendered":"\u53ec\u56de\u7387 Recall\u3001\u7cbe\u786e\u5ea6Precision\u3001\u51c6\u786e\u7387Accuracy\u3001\u865a\u8b66\u3001\u6f0f\u8b66\u7b49\u5206\u7c7b\u5224\u5b9a\u6307\u6807"},"content":{"rendered":"<p>\u8f6c\u8f7d\u81ea\uff1a<a href=\"http:\/\/hi.baidu.com\/lwhptl\/item\/c2da5a3c098e4ac6382ffa5f\" target=\"_blank\" rel=\"noopener noreferrer\">http:\/\/hi.baidu.com\/lwhptl\/item\/c2da5a3c098e4ac6382ffa5f<\/a><\/p>\n<p style=\"color: #454545;\"><strong>\u5047\u8bbe\u539f\u59cb\u6837\u672c\u4e2d\u6709\u4e24\u7c7b\uff0c\u5176\u4e2d\uff1a<\/strong><br \/>\n1\uff1a\u603b\u5171\u6709 P\u4e2a\u7c7b\u522b\u4e3a1\u7684\u6837\u672c\uff0c\u5047\u8bbe\u7c7b\u522b1\u4e3a\u6b63\u4f8b\u3002<br \/>\n2\uff1a\u603b\u5171\u6709N\u4e2a\u7c7b\u522b\u4e3a0 \u7684\u6837\u672c\uff0c\u5047\u8bbe\u7c7b\u522b0\u4e3a\u8d1f\u4f8b\u3002<br \/>\n<strong>\u7ecf\u8fc7\u5206\u7c7b\u540e\uff1a<br \/>\n<\/strong>3\uff1a\u6709 TP\u4e2a\u7c7b\u522b\u4e3a1 \u7684\u6837\u672c\u88ab\u7cfb\u7edf\u6b63\u786e\u5224\u5b9a\u4e3a\u7c7b\u522b1\uff0cFN \u4e2a\u7c7b\u522b\u4e3a1 \u7684\u6837\u672c\u88ab\u7cfb\u7edf\u8bef\u5224\u5b9a\u4e3a\u7c7b\u522b 0\uff0c\u663e\u7136\u6709P=TP+FN\uff1b<br \/>\n4\uff1a\u6709 FP \u4e2a\u7c7b\u522b\u4e3a0 \u7684\u6837\u672c\u88ab\u7cfb\u7edf\u8bef\u5224\u65ad\u5b9a\u4e3a\u7c7b\u522b1\uff0cTN \u4e2a\u7c7b\u522b\u4e3a0 \u7684\u6837\u672c\u88ab\u7cfb\u7edf\u6b63\u786e\u5224\u4e3a\u7c7b\u522b 0\uff0c\u663e\u7136\u6709N=FP+TN\uff1b<br \/>\n<strong>\u90a3\u4e48\uff1a<br \/>\n<\/strong>\u7cbe\u786e\u5ea6\uff08Precision\uff09\uff1a<br \/>\nP = TP\/(TP+FP) ;\u00a0 \u53cd\u6620\u4e86\u88ab\u5206\u7c7b\u5668\u5224\u5b9a\u7684\u6b63\u4f8b\u4e2d\u771f\u6b63\u7684\u6b63\u4f8b\u6837\u672c\u7684\u6bd4\u91cd\uff08<br \/>\n\u51c6\u786e\u7387\uff08Accuracy\uff09<br \/>\nA = (TP + TN)\/(P+N) = (TP + TN)\/(TP + FN + FP + TN);\u00a0\u00a0\u00a0 \u53cd\u6620\u4e86\u5206\u7c7b\u5668\u7edf\u5bf9\u6574\u4e2a\u6837\u672c\u7684\u5224\u5b9a\u80fd\u529b\u2014\u2014\u80fd\u5c06\u6b63\u7684\u5224\u5b9a\u4e3a\u6b63\uff0c\u8d1f\u7684\u5224\u5b9a\u4e3a\u8d1f<br \/>\n\u53ec\u56de\u7387(Recall)\uff0c\u4e5f\u79f0\u4e3a True Positive Rate:<br \/>\nR = TP\/(TP+FN) = 1 &#8211; FN\/T;\u00a0 \u53cd\u6620\u4e86\u88ab\u6b63\u786e\u5224\u5b9a\u7684\u6b63\u4f8b\u5360\u603b\u7684\u6b63\u4f8b\u7684\u6bd4\u91cd<br \/>\n\u8f6c\u79fb\u6027\uff08Specificity\uff0c\u4e0d\u77e5\u9053\u8fd9\u4e2a\u7ffb\u8bd1\u5bf9\u4e0d\u5bf9\uff0c\u8fd9\u4e2a\u6307\u6807\u7528\u7684\u4e5f\u4e0d\u591a\uff09\uff0c\u4e5f\u79f0\u4e3a True NegativeRate<br \/>\nS = TN\/(TN + FP) = 1 \u2013 FP\/N\uff1b\u00a0\u00a0 \u660e\u663e\u7684\u8fd9\u4e2a\u548c\u53ec\u56de\u7387\u662f\u5bf9\u5e94\u7684\u6307\u6807\uff0c\u53ea\u662f\u7528\u5b83\u5728\u8861\u91cf\u7c7b\u522b0 \u7684\u5224\u5b9a\u80fd\u529b\u3002<br \/>\nF-measure or balanced F-score<br \/>\nF = 2 *\u00a0 \u53ec\u56de\u7387 *\u00a0 \u51c6\u786e\u7387\/ (\u53ec\u56de\u7387+\u51c6\u786e\u7387)\uff1b\u8fd9\u5c31\u662f\u4f20\u7edf\u4e0a\u901a\u5e38\u8bf4\u7684F1 measure\uff0c\u53e6\u5916\u8fd8\u6709\u4e00\u4e9b\u522b\u7684F measure\uff0c\u53ef\u4ee5\u53c2\u8003\u4e0b\u9762\u7684\u94fe\u63a5<br \/>\n\u4e0a\u9762\u8fd9\u4e9b\u4ecb\u7ecd\u53ef\u4ee5\u53c2\u8003\uff1a<br \/>\n<a style=\"color: #3fa7cb;\" href=\"http:\/\/en.wikipedia.org\/wiki\/Precision_and_recall\" target=\"_blank\" rel=\"noopener noreferrer\">http:\/\/en.wikipedia.org\/wiki\/Precision_and_recall<\/a><br \/>\n\u540c\u65f6\uff0c\u4e5f\u53ef\u4ee5\u770b\u770b\uff1a<a style=\"color: #3fa7cb;\" href=\"http:\/\/en.wikipedia.org\/wiki\/Accuracy_and_precision\" target=\"_blank\" rel=\"noopener noreferrer\">http:\/\/en.wikipedia.org\/wiki\/Accuracy_and_precision<\/a><br \/>\n<strong>\u4e3a\u4ec0\u4e48\u4f1a\u6709\u8fd9\u4e48\u591a\u6307\u6807\u5462\uff1f<br \/>\n<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd9\u662f\u56e0\u4e3a\u6a21\u5f0f\u5206\u7c7b\u548c\u673a\u5668\u5b66\u4e60\u7684\u9700\u8981\u3002\u5224\u65ad\u4e00\u4e2a\u5206\u7c7b\u5668\u5bf9\u6240\u7528\u6837\u672c\u7684\u5206\u7c7b\u80fd\u529b\u6216\u8005\u5728\u4e0d\u540c\u7684\u5e94\u7528\u573a\u5408\u65f6\uff0c\u9700\u8981\u6709\u4e0d\u540c\u7684\u6307\u6807\u3002 \u5f53\u603b\u5171\u6709\u4e2a100 \u4e2a\u6837\u672c\uff08P+N=100\uff09\u65f6\uff0c\u5047\u5982\u53ea\u6709\u4e00\u4e2a\u6b63\u4f8b\uff08P=1\uff09\uff0c\u90a3\u4e48\u53ea\u8003\u8651\u7cbe\u786e\u5ea6\u7684\u8bdd\uff0c\u4e0d\u9700\u8981\u8fdb\u884c\u4efb\u4f55\u6a21\u578b\u7684\u8bad\u7ec3\uff0c\u76f4\u63a5\u5c06\u6240\u6709\u6d4b\u8bd5\u6837\u672c\u5224\u4e3a\u6b63\u4f8b\uff0c\u90a3\u4e48 A \u80fd\u8fbe\u5230 99%\uff0c\u975e\u5e38\u9ad8\u4e86\uff0c\u4f46\u8fd9\u5e76\u6ca1\u6709\u53cd\u6620\u51fa\u6a21\u578b\u771f\u6b63\u7684\u80fd\u529b\u3002\u53e6\u5916\u5728\u7edf\u8ba1\u4fe1\u53f7\u5206\u6790\u4e2d\uff0c\u5bf9\u4e0d\u540c\u7c7b\u7684\u5224\u65ad\u7ed3\u679c\u7684\u9519\u8bef\u7684\u60e9\u7f5a\u662f\u4e0d\u4e00\u6837\u7684\u3002\u4e3e\u4f8b\u800c\u8a00\uff0c\u96f7\u8fbe\u6536\u5230100\u4e2a\u6765\u88ad\u5bfc\u5f39\u7684\u4fe1\u53f7\uff0c\u5176\u4e2d\u53ea\u6709 3\u4e2a\u662f\u771f\u6b63\u7684\u5bfc\u5f39\u4fe1\u53f7\uff0c\u5176\u4f59 97 \u4e2a\u662f\u654c\u65b9\u6a21\u62df\u7684\u5bfc\u5f39\u4fe1\u53f7\u3002\u5047\u5982\u7cfb\u7edf\u5224\u65ad 98 \u4e2a\uff0897 \u4e2a\u6a21\u62df\u4fe1\u53f7\u52a0\u4e00\u4e2a\u771f\u6b63\u7684\u5bfc\u5f39\u4fe1\u53f7\uff09\u4fe1\u53f7\u90fd\u662f\u6a21\u62df\u4fe1\u53f7\uff0c\u90a3\u4e48Accuracy=98%\uff0c\u5f88\u9ad8\u4e86\uff0c\u5269\u4e0b\u4e24\u4e2a\u662f\u5bfc\u5f39\u4fe1\u53f7\uff0c\u88ab\u622a\u6389\uff0c\u8fd9\u65f6Recall=2\/3=66.67%\uff0cPrecision=2\/2=100%\uff0cPrecision\u4e5f\u5f88\u9ad8\u3002\u4f46\u5269\u4e0b\u7684\u90a3\u9897\u5bfc\u5f39\u5c31\u4f1a\u9020\u6210\u707e\u5bb3\u3002<br \/>\n<strong>\u56e0\u6b64\u5728\u7edf\u8ba1\u4fe1\u53f7\u5206\u6790\u4e2d\uff0c\u6709\u53e6\u5916\u4e24\u4e2a\u6307\u6807\u6765\u8861\u91cf\u5206\u7c7b\u5668\u9519\u8bef\u5224\u65ad\u7684\u540e\u679c\uff1a<br \/>\n<\/strong>\u6f0f\u8b66\u6982\u7387\uff08Missing Alarm\uff09<br \/>\nMA = FN\/(TP + FN) = 1 \u2013 TP\/T = 1 &#8211; R\uff1b\u00a0 \u53cd\u6620\u6709\u591a\u5c11\u4e2a\u6b63\u4f8b\u88ab\u6f0f\u5224\u4e86\uff08\u6211\u4eec\u8fd9\u91cc\u5c31\u662f\u771f\u6b63\u7684\u5bfc\u5f39\u4fe1\u53f7\u88ab\u5224\u65ad\u4e3a\u6a21\u62df\u4fe1\u53f7\uff0c\u53ef\u89c1MA\u6b64\u65f6\u4e3a 33.33%\uff0c\u592a\u9ad8\u4e86\uff09<\/p>\n<p style=\"color: #454545;\">\n\u865a\u8b66\u6982\u7387\uff08False Alarm\uff09<br \/>\nFA = FP \/ (TP + FP) = 1 \u2013 P\uff1b\u53cd\u6620\u88ab\u5224\u4e3a\u6b63\u4f8b\u6837\u672c\u4e2d\uff0c\u6709\u591a\u5c11\u4e2a\u662f\u8d1f\u4f8b\u3002<\/p>\n<p style=\"color: #454545;\">\n\u7edf\u8ba1\u4fe1\u53f7\u5206\u6790\u4e2d\uff0c\u5e0c\u671b\u4e0a\u8ff0\u7684\u4e24\u4e2a\u9519\u8bef\u6982\u7387\u5c3d\u91cf\u5c0f\u3002\u800c\u5bf9\u5206\u7c7b\u5668\u7684\u603b\u7684\u60e9\u7f5a\u65e7\u662f\u4e0a\u9762\u4e24\u79cd\u9519\u8bef\u5206\u522b\u52a0\u4e0a\u60e9\u7f5a\u56e0\u5b50\u7684\u548c\uff1aCOST = Cma *MA + Cfa * FA\u3002\u4e0d\u540c\u7684\u573a\u5408\u3001\u9700\u8981\u4e0b\uff0c\u5bf9\u4e0d\u540c\u7684\u9519\u8bef\u7684\u60e9\u7f5a\u4e5f\u4e0d\u4e00\u6837\u7684\u3002\u50cf\u8fd9\u91cc\uff0c\u6211\u4eec\u81ea\u7136\u5e0c\u671b\u5bf9\u6f0f\u8b66\u7684\u60e9\u7f5a\u5927\uff0c\u56e0\u6b64\u5b83\u7684\u60e9\u7f5a\u56e0\u5b50 Cma \u8981\u5927\u4e9b\u3002<\/p>\n<p style=\"color: #454545;\">\u00a0\u00a0\u00a0\u00a0 \u00a0 \u4e2a\u4eba\u89c2\u70b9\uff1a\u867d\u7136\u4e0a\u8ff0\u6307\u6807\u4e4b\u95f4\u53ef\u4ee5\u4e92\u76f8\u8f6c\u6362\uff0c\u4f46\u5728\u6a21\u5f0f\u5206\u7c7b\u4e2d\uff0c\u4e00\u822c\u7528 P\u3001R\u3001A \u4e09\u4e2a\u6307\u6807\uff0c\u4e0d\u7528MA\u548c FA\u3002\u800c\u4e14\u7edf\u8ba1\u4fe1\u53f7\u5206\u6790\u4e2d\uff0c\u4e5f\u5f88\u5c11\u770b\u5230\u7528 R \u7684\u3002\u5982\u679c\u6709\u9519\u8bef\u7684\u5730\u65b9\uff0c\u6b22\u8fce\u6307\u51fa\u5e76\u6539\u6b63<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8f6c\u8f7d\u81ea\uff1ahttp:\/\/hi.baidu.com\/lwhptl\/item\/c2da5a3c098e4ac6382ffa5f \u5047\u8bbe\u539f\u59cb\u6837\u672c\u4e2d\u6709\u4e24\u7c7b\uff0c\u5176\u4e2d\uff1a 1\uff1a\u603b\u5171\u6709 P\u4e2a\u7c7b\u522b\u4e3a1\u7684\u6837\u672c\uff0c\u5047\u8bbe\u7c7b\u522b1\u4e3a\u6b63\u4f8b\u3002 2\uff1a\u603b\u5171\u6709N\u4e2a\u7c7b\u522b\u4e3a0 \u7684\u6837\u672c\uff0c\u5047\u8bbe\u7c7b\u522b0\u4e3a\u8d1f\u4f8b\u3002 \u7ecf\u8fc7\u5206\u7c7b\u540e\uff1a 3\uff1a\u6709 TP\u4e2a\u7c7b\u522b\u4e3a1 \u7684\u6837\u672c\u88ab\u7cfb\u7edf\u6b63\u786e\u5224\u5b9a\u4e3a\u7c7b\u522b1\uff0cFN \u4e2a\u7c7b\u522b\u4e3a1 \u7684\u6837\u672c\u88ab\u7cfb\u7edf\u8bef\u5224\u5b9a\u4e3a\u7c7b\u522b 0\uff0c\u663e\u7136\u6709P=TP+FN\uff1b 4\uff1a\u6709 FP \u4e2a\u7c7b\u522b\u4e3a0 \u7684\u6837\u672c\u88ab\u7cfb\u7edf\u8bef\u5224\u65ad\u5b9a\u4e3a\u7c7b\u522b1\uff0cTN \u4e2a\u7c7b\u522b\u4e3a0 \u7684\u6837\u672c\u88ab\u7cfb\u7edf\u6b63\u786e\u5224\u4e3a\u7c7b\u522b 0\uff0c\u663e\u7136\u6709N=FP+TN\uff1b \u90a3\u4e48\uff1a \u7cbe\u786e\u5ea6\uff08Precision\uff09\uff1a P = TP\/(TP+FP) ;\u00a0 \u53cd\u6620\u4e86\u88ab\u5206\u7c7b\u5668\u5224\u5b9a\u7684\u6b63\u4f8b\u4e2d\u771f\u6b63\u7684\u6b63\u4f8b\u6837\u672c\u7684\u6bd4\u91cd\uff08 \u51c6\u786e\u7387\uff08Accuracy\uff09 A = (TP + TN)\/(P+N) = (TP + TN)\/(TP + FN + FP + TN);\u00a0\u00a0\u00a0 \u53cd\u6620\u4e86\u5206\u7c7b\u5668\u7edf\u5bf9\u6574\u4e2a\u6837\u672c\u7684\u5224\u5b9a\u80fd\u529b\u2014\u2014\u80fd\u5c06\u6b63\u7684\u5224\u5b9a\u4e3a\u6b63\uff0c\u8d1f\u7684\u5224\u5b9a\u4e3a\u8d1f \u53ec\u56de\u7387(Recall)\uff0c\u4e5f\u79f0\u4e3a True Positive Rate: R = TP\/(TP+FN) = 1 &#8211; FN\/T;\u00a0 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[170,187],"class_list":["post-1221","post","type-post","status-publish","format-standard","hentry","category-study","tag-170","tag-187"],"_links":{"self":[{"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=\/wp\/v2\/posts\/1221","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1221"}],"version-history":[{"count":0,"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=\/wp\/v2\/posts\/1221\/revisions"}],"wp:attachment":[{"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1221"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1221"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1221"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}