{"id":3794,"date":"2021-04-22T15:44:03","date_gmt":"2021-04-22T07:44:03","guid":{"rendered":"http:\/\/www.sniper97.cn\/?p=3794"},"modified":"2021-04-22T15:44:03","modified_gmt":"2021-04-22T07:44:03","slug":"%e3%80%90%e6%b7%b1%e5%ba%a6%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0%e3%80%91precision%ef%bc%8crecall%ef%bc%8cf1","status":"publish","type":"post","link":"http:\/\/www.sniper97.cn\/index.php\/note\/deep-learning\/note-deep-learning\/3794\/","title":{"rendered":"\u3010\u6df1\u5ea6\u5b66\u4e60\u7b14\u8bb0\u3011precision\uff0crecall\uff0cf1"},"content":{"rendered":"\n<p>\u8fd9\u4e2a\u95ee\u9898\u5176\u5b9e\u5e76\u4e0d\u96be\uff0c\u4f46\u662f\u6700\u8fd1\u9047\u5230\u4e86\u4e00\u4e2a\u6bd4\u8f83\u65b0\u5947\u7684F1\u7b97\u6cd5\uff0c\u56e0\u6b64\u8bb0\u5f55\u4e0b\u6765\u3002<\/p>\n\n\n<p>\u9996\u5148\u6211\u4eec\u5b9a\u4e49\u51e0\u4e2a\u53d8\u91cf\uff1a<\/p>\n\n\n<ul><li>TP\uff1a\u9884\u6d4b\u4e3a1\uff0c\u5b9e\u9645\u4e3a1.<\/li><li>TN\uff1a\u9884\u6d4b\u4e3a0\uff0c\u5b9e\u9645\u4e3a0.<\/li><li>FP\uff1a\u9884\u6d4b\u4e3a1\uff0c\u5b9e\u9645\u4e3a0.<\/li><li>FN\uff1a\u9884\u6d4b\u4e3a0\uff0c\u5b9e\u9645\u4e3a1.<\/li><\/ul>\n\n\n<p> \u51c6\u786e\u7387\uff08accuracy\uff09\uff1a (TP+TN)\/(TP+TN+FP+FN) [\u9884\u6d4b\u5bf9\u7684\/\u603b\u6837\u672c]<\/p>\n\n\n<p>\u7cbe\u786e\u7387\uff08precision\uff09\uff1a TP\/(TP+FP) [\u9884\u6d4b\u4e3a1\u4e14\u6b63\u786e\u6240\u5360\u7684\u6837\u672c\u6570\/\u6240\u6709\u9884\u6d4b\u4e3a1\u7684\u6837\u672c]<\/p>\n\n\n<p>\u53ec\u56de\u7387\uff08recall\uff09\uff1a TP\/(TP+FN) [\u9884\u6d4b\u4e3a1\u4e14\u6b63\u786e\u7684\u4e2a\u6570\/\u6240\u6709\u771f\u5b9e\u4e3a1\u7684\u6807\u7b7e]<\/p>\n\n\n<p>\u6ce8\uff1a\u4e2d\u6587\u540d\u5b57\u53eb\u6cd5\u591a\u6837\uff0c\u4f46\u662f\u82f1\u6587\u6bd4\u8f83\u7edf\u4e00\u3002<\/p>\n\n\n<p>\u800cF1\u5219\u4e3a  2*(Precision*Recall)\/(Precision+Recall) \u3002<\/p>\n\n\n<p>\u90a3\u4e48\u6211\u8bf4\u7684\u201c\u65b0\u5947\u201d\u5728\u54ea\u5462\uff1f\u4e5f\u53ef\u80fd\u662f\u6211\u89c1\u8bc6\u5c11\u5427\uff0c\u9047\u5230\u4e86\u4e00\u4e2af1\u7b97\u6cd5\u4e3a\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>total = ((y_pred + y_true).sum()\nright = ((y_pred * y_true).sum()\nf1 = 2.0 * right \/ total<\/code><\/pre>\n\n\n<p>\u521a\u5f00\u59cb\u6ca1\u6709\u53cd\u5e94\u8fc7\u6765\uff0c\u8fc7\u4e86\u4e00\u4f1a\u4e5f\u6ca1\u53cd\u5e94\u8fc7\u6765\u3002<\/p>\n\n\n<p>\u540e\u6765\u7ecf\u8fc7\u63a8\u5bfc\u53d1\u73b0\uff1a<\/p>\n\n\n<p>\u6211\u4eec\u5c06 (Precision*Recall)\/(Precision+Recall)  \u8fd9\u4e2a\u516c\u5f0f\u4ee3\u5165TP\u8fd9\u4e9b\uff0c\u6700\u7ec8\u4f1a\u5316\u7b80\u4e3a\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>TP\/\uff082TP+FP+FN\uff09<\/code><\/pre>\n\n\n<p>\u800cright\u7684\u7b97\u6cd5\uff0c\u5c31\u662fTP\uff08\u53ea\u6709\u771f\u5b9e\u4e3a1\u5e76\u4e14\u9884\u6d4b\u4e3a1\u7684\u6837\u672c\uff0cy_pred * y_true \u624d\u4e3a1\uff09\uff0c\u800ctotal\u5c31\u6bd4\u8f83\u5947\u602a\u4e86\uff0c\u6211\u4eec\u5047\u8bbe\u4e00\u7cfb\u5217\u6837\u672c\u4e3a\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>1  1  0  0   \u9884\u6d4b\u503c\n0  1  1  0   \u771f\u5b9e\u503c<\/code><\/pre>\n\n\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u6309\u7167(y_pred + y_true) \u6765\u8ba1\u7b97\u4e3a4\uff0c\u6070\u597d\u662f\uff082TP+FP+FN\uff09\u7684\u503c\uff0c\u56e0\u6b64\u5bf9\u4e8e\u67d0\u4e2a0 1\u6807\u7b7e\u7684F1\u8ba1\u7b97\u5c31\u53d8\u7b80\u5355\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u4e2a\u95ee\u9898\u5176\u5b9e\u5e76\u4e0d\u96be\uff0c\u4f46\u662f\u6700\u8fd1\u9047\u5230\u4e86\u4e00\u4e2a\u6bd4\u8f83\u65b0\u5947\u7684F1\u7b97\u6cd5\uff0c\u56e0\u6b64\u8bb0\u5f55\u4e0b\u6765\u3002 \u9996\u5148\u6211\u4eec\u5b9a\u4e49\u51e0\u4e2a\u53d8\u91cf\uff1a T [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[9],"tags":[33,37,39],"views":2689,"_links":{"self":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/3794"}],"collection":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/comments?post=3794"}],"version-history":[{"count":0,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/3794\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/media?parent=3794"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/categories?post=3794"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/tags?post=3794"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}