{"id":40717,"date":"2023-12-11T14:51:27","date_gmt":"2023-12-11T06:51:27","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=40717"},"modified":"2023-12-11T14:51:27","modified_gmt":"2023-12-11T06:51:27","slug":"auc%e7%a9%b6%e7%ab%9f%e5%9c%a8%e8%a1%a1%e9%87%8f%e6%a8%a1%e5%9e%8b%e4%bb%80%e4%b9%88%e8%83%bd%e5%8a%9b%ef%bc%9f%e4%bb%a3%e7%a0%81%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/11\/auc%e7%a9%b6%e7%ab%9f%e5%9c%a8%e8%a1%a1%e9%87%8f%e6%a8%a1%e5%9e%8b%e4%bb%80%e4%b9%88%e8%83%bd%e5%8a%9b%ef%bc%9f%e4%bb%a3%e7%a0%81%e5%ae%9e%e7%8e%b0\/","title":{"rendered":"AUC\u7a76\u7adf\u5728\u8861\u91cf\u6a21\u578b\u4ec0\u4e48\u80fd\u529b\uff1f\u4ee3\u7801\u5b9e\u73b0"},"content":{"rendered":"<p>&#8220;`&#8221;                    \u5f53\u6d4b\u8bd5\u96c6\u4e2d\u7684\u6b63\u8d1f\u6837\u672c\u7684\u5206\u5e03\u53d8\u5316\u7684\u65f6\u5019\uff0cROC\u66f2\u7ebf\u80fd\u591f\u4fdd\u6301\u4e0d\u53d8\u3002\u5728\u5b9e\u9645\u7684\u6570\u636e\u96c6\u4e2d\u7ecf\u5e38\u4f1a\u51fa\u73b0\u7c7b\u4e0d\u5e73\u8861\uff08class imbalance\uff09\u73b0\u8c61\uff0c\u5373\u8d1f\u6837\u672c\u6bd4\u6b63\u6837\u672c\u591a\u5f88\u591a\uff08\u6216\u8005\u76f8\u53cd\uff09\uff0c\u800c\u4e14\u6d4b\u8bd5\u6570\u636e\u4e2d\u7684\u6b63\u8d1f\u6837\u672c\u7684\u5206\u5e03\u4e5f\u53ef\u80fd\u968f\u7740\u65f6\u95f4\u53d8\u5316\u3002<\/p>\n<p>\u5b83\u4e0d\u53d7\u7c7b\u522b\u4e0d\u5e73\u8861\u95ee\u9898\u7684\u5f71\u54cd\uff0c\u4e0d\u540c\u7684\u6837\u672c\u6bd4\u4f8b\u4e0d\u4f1a\u5f71\u54cdAUC\u7684\u8bc4\u6d4b\u7ed3\u679c<\/p>\n<p>\u00a0<\/p>\n<p>&lt;pre&gt;&lt;code&gt;#author: wepondef naive_auc(labels,preds):    &quot;&quot;&quot;&quot;&quot;&quot;    \u6700\u7b80\u5355\u7c97\u66b4\u7684\u65b9\u6cd5\u3000\u3000\u3000\u5148\u6392\u5e8f\uff0c\u7136\u540e\u7edf\u8ba1\u6709\u591a\u5c11\u6b63\u8d1f\u6837\u672c\u5bf9\u6ee1\u8db3\uff1a\u6b63\u6837\u672c\u9884\u6d4b\u503c&gt;\u8d1f\u6837\u672c\u9884\u6d4b\u503c, \u518d\u9664\u4ee5\u603b\u7684\u6b63\u8d1f\u6837\u672c\u5bf9\u4e2a\u6570     \u590d\u6742\u5ea6 O(NlogN), N\u4e3a\u6837\u672c\u6570    &quot;&quot;&quot;&quot;&quot;&quot;    n_pos = sum(labels)    n_neg = len(labels) &#8211; n_pos    total_pair = n_pos * n_neg    labels_preds = zip(labels,preds)labels_preds = sorted(labels_preds,key=lambda x:x[1])accumulated_neg = 0satisfied_pair = 0for i in range(len(labels_preds)):    if labels_preds[i][0] == 1:        satisfied_pair += accumulated_neg    else:        accumulated_neg += 1 return satisfied_pair \/ float(total_pair)&lt;\/code&gt;&lt;\/pre&gt;<\/p>\n<p>\u00a0<\/p>\n<p>&lt;pre&gt;&lt;code&gt;            &quot;&#8220;`<br \/>\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>&#8220;`&#8221; \u5f53\u6d4b\u8bd5\u96c6\u4e2d\u7684\u6b63\u8d1f\u6837\u672c\u7684\u5206\u5e03\u53d8\u5316\u7684\u65f6\u5019\uff0cROC\u66f2\u7ebf\u80fd\u591f\u4fdd\u6301\u4e0d\u53d8\u3002\u5728\u5b9e\u9645\u7684\u6570\u636e\u96c6\u4e2d [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-40717","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/40717","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=40717"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/40717\/revisions"}],"predecessor-version":[{"id":40718,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/40717\/revisions\/40718"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=40717"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=40717"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=40717"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}