{"id":25412,"date":"2023-04-20T21:52:54","date_gmt":"2023-04-20T13:52:54","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=25412"},"modified":"2023-07-30T23:24:25","modified_gmt":"2023-07-30T15:24:25","slug":"k-nearest-neighbor%e5%9c%a8%e6%b5%b7%e9%87%8f%e6%95%b0%e6%8d%ae%e7%9a%84%e6%83%85%e5%86%b5%e4%b8%8b%e7%94%a8%e4%bb%80%e4%b9%88%e6%95%b0%e6%8d%ae%e7%bb%93%e6%9e%84%e6%af%94%e8%be%83%e5%a5%bd","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/25412.html","title":{"rendered":"k-Nearest Neighbor\u5728\u6d77\u91cf\u6570\u636e\u7684\u60c5\u51b5\u4e0b\u7528\u4ec0\u4e48\u6570\u636e\u7ed3\u6784\u6bd4\u8f83\u597d"},"content":{"rendered":"<blockquote class=\"wp-block-quote\">\n<p>k-Nearest Neighbor\u5728\u6d77\u91cf\u6570\u636e\u7684\u60c5\u51b5\u4e0b\uff0c\u5199\u4e00\u6761\u6570\u636e\u5230flat file\uff0cA_id, B_id\uff0c\u5c31\u8fd9\u4e48\u5b58\u3002\u9488\u5bf9\u4e0d\u540c\u7684\u5e94\u7528\u573a\u666f\uff0c\u53ef\u4ee5\u505a\u4e0d\u540c\u7684\u4f18\u5316\u3002\u8981\u5b9e\u65f6\u627e\u5230\u6709\u660e\u786e\u8ddd\u79bb\u5ea6\u91cf\uff0c\u751a\u81f3\u53ef\u4ee5\u901a\u8fc7\u5206\u5757\u5212\u533a\u964d\u4f4e\u5f85\u9009\u70b9\u7684\u6570\u91cf\u7ea7\u7684\u5e94\u7528\u573a\u666f\u3002<\/p>\n<\/blockquote>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img fetchpriority=\"high\" alt=\"\" class=\"wp-image-25413\" decoding=\"async\" height=\"421\" sizes=\"(max-width: 680px) 100vw, 680px\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/04\/\u6dfb\u52a0\u6807\u9898-2-12.png?x-oss-process=image\/auto-orient,1\/format,webp\" srcset=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/04\/\u6dfb\u52a0\u6807\u9898-2-12.png?x-oss-process=image\/auto-orient,1\/format,webp 680w, https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/04\/\u6dfb\u52a0\u6807\u9898-2-12-300x186.png 300w\" width=\"680\"\/><\/figure>\n<\/div>\n<h2 class=\"wp-block-heading\"><strong>\u4e00\u3001k-Nearest Neighbor\u5728\u6d77\u91cf\u6570\u636e\u7684\u60c5\u51b5\u4e0b\u7528\u4ec0\u4e48\u6570\u636e\u7ed3\u6784\u6bd4\u8f83\u597d<\/strong><\/h2>\n<p>k-Nearest Neighbor\u5728\u6d77\u91cf\u6570\u636e\u7684\u60c5\u51b5\u4e0b\uff0c\u5199\u4e00\u6761\u6570\u636e\u5230flat file\uff0cA_id, B_id\uff0c\u5c31\u8fd9\u4e48\u5b58\u3002\u9488\u5bf9\u4e0d\u540c\u7684\u5e94\u7528\u573a\u666f\uff0c\u53ef\u4ee5\u505a\u4e0d\u540c\u7684\u4f18\u5316\u3002\u8981\u5b9e\u65f6\u627e\u5230\u6709\u660e\u786e\u8ddd\u79bb\u5ea6\u91cf\uff0c\u751a\u81f3\u53ef\u4ee5\u901a\u8fc7\u5206\u5757\u5212\u533a\u964d\u4f4e\u5f85\u9009\u70b9\u7684\u6570\u91cf\u7ea7\u7684\u5e94\u7528\u573a\u666f\u3002<\/p>\n<p>\u540c\u65f6\u8981\u652f\u6301\u5f85\u9009\u70b9\u7684\u5b9e\u65f6\u6dfb\u52a0\u548c\u53bb\u9664\u3002<\/p>\n<p>\u90a3\u6211\u89c9\u5f97\u8fd9\u79cd\u60c5\u51b5\u53ea\u6709\u7cfb\u7edf\u8fd0\u7ef4\u9700\u8981\u8003\u8651\u201c\u6d77\u91cf\u201d\uff0c\u5149\u4eceKNN\u6765\u8bf4\uff0c\u6309\u5c42\u6b21\u5206\u5757\u5212\u533a\u4ee5\u540e\uff0c\u76f4\u63a5\u7b97\u90fd\u53ef\u4ee5\u3002<\/p>\n<p>\u90a3\u8fd0\u7ef4\u90a3\u8fb9\u7684\u201c\u6d77\u91cf\u201d\uff0c\u66f4\u662f\u6709\u4e00\u5927\u5806\u53ef\u505a\u7684\u4f18\u5316\u3002\u6bd4\u5982\u4ee5\u4e00\u4e2a\u56fa\u5b9a\u70b9\u4ee3\u8868\u6765\u81ea\u4e00\u5757\u533a\u57df\u7684\u8bf7\u6c42\u3002\u5168\u4e0a\u6d77\u51e0\u5343\u4e07\u4eba\u4e00\u8d77\u8bf7\u6c42\u6700\u8fd1\u51fa\u79df\u8f66\uff0c\u6211\u5185\u90e8\u53ea\u8981\u7b97\u51e0\u4e07\u4e2a\u8bf7\u6c42\u6765\u6e90\u5c31\u884c\u4e86\u3002KNN\u4e5f\u6ca1\u5fc5\u8981\u975e\u5f97\u662f\u6700\u8fd1\u7684\uff0c\u6211\u5728\u4e00\u5b9a\u533a\u57df\u5185\u968f\u673a\u6311\uff0c\u671f\u671b\u5e73\u5747\u8ddd\u79bb\u548c\u6700\u5c0f\u5e73\u5747\u8ddd\u79bb\u5dee\u591a\u5c11\u662f\u5b8c\u5168\u53ef\u63a7\u7684\u3002<\/p>\n<p>KNN\u7b97\u6cd5\u7a33\u5b9a\u6027\u597d\u3001\u51c6\u786e\u7387\u9ad8\u3001\u7b80\u5355\u6613\u7528\uff0c\u9488\u5bf9\u5927\u6570\u636e\u7684\u5206\u7c7b\u95ee\u9898\uff0c\u5b83\u5b58\u5728\u7740\u5982\u4e0b\u7f3a\u70b9:a)\u5bf9\u6bcf\u4e00\u4e2a\u5f85\u5206\u7c7b\u7684\u6587\u672c\u90fd\u8981\u8ba1\u7b97\u5b83\u5230\u5168\u4f53\u5df2\u77e5\u6837\u672c\u7684\u8ddd\u79bb\uff0c\u624d\u80fd\u6c42\u5f97\u5b83\u7684K\u4e2a\u6700\u8fd1\u90bb\u70b9\uff0c\u800c\u5927\u6570\u636e\u7684\u5178\u578b\u7279\u70b9\u5c31\u662f\u6570\u636e\u4fe1\u606f\u6d77\u91cf\u3001\u4ef7\u503c\u5bc6\u5ea6\u4f4e\uff0c\u8fd9\u5c31\u663e\u7136\u51fa\u73b0\u4e86\u5f88\u5927\u7684\u65e0\u6548\u8ba1\u7b97\u91cf\uff0c\u5728\u51b3\u5b9a\u6d4b\u8bd5\u6837\u672c\u7684\u7c7b\u522b\u65f6\uff0c\u8be5\u7b97\u6cd5\u53ea\u8ba1\u7b97\u6700\u8fd1\u90bb\u7684\u6837\u672c\u3010neighbor-weighted K-nearest neighbor for unbalanced text corpus\u3011\uff0c\u800c\u5927\u6570\u636e\u7684\u53e6\u4e00\u4e2a\u663e\u8457\u7279\u70b9\u662f\u6d89\u53ca\u9886\u57df\u7e41\u591a\u3001\u7c7b\u522b\u754c\u9650\u4e0d\u660e\u663e\uff0c\u5bf9\u4e8e\u6b64\u7c7b\u6587\u672c\u5bb9\u6613\u4f7f\u5224\u51b3\u7ed3\u679c\u4ea7\u751f\u504f\u5dee;c)\u968f\u7740\u4fe1\u606f\u7206\u70b8\u65f6\u4ee3\u7684\u5230\u6765\uff0c\u5404\u79cd\u65b0\u7684\u4e8b\u7269\u5c42\u51fa\u4e0d\u7a77\uff0c\u51fa\u73b0\u65b0\u7684\u7c7b\u522b\u7684\u6982\u7387\u6781\u5927\uff0c\u800cKNN\u7b97\u6cd5\u7684\u90bb\u5c45\u90fd\u662f\u5df2\u77e5\u7684\u7c7b\u522b\u6837\u672c\uff0c\u4e5f\u5c31\u5bfc\u81f4\u4e86\u5bf9\u65b0\u6837\u672c\u7684\u65e0\u77e5\u6216\u8005\u8bef\u5224\u3002<\/p>\n<p><strong>\u5ef6\u4f38\u9605\u8bfb\uff1a<\/strong><\/p>\n<h2 class=\"wp-block-heading\"><strong>\u4e8c\u3001\u6539\u8fdb\u7684KNN\u7b97\u6cd5\u2014\u5dee\u5206\u591a\u5c42KNN (DM-KNN)\u7b97\u6cd5<\/strong><\/h2>\n<p>\u9488\u5bf9\u5927\u6570\u636e\u7684\u81ea\u8eab\u7279\u70b9\u4ee5\u53caKNN\u7b97\u6cd5\u7684\u7f3a\u70b9\uff0c\u7b97\u6cd5\u4e3b\u8981\u5728\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u800c\u8fdb\u884c\u4e86\u6539\u8fdb:a)\u6784\u5efa\u6811\u72b6\u5206\u5c42\u7ed3\u6784\uff0c\u9488\u5bf9KNN\u7b97\u6cd5\u8ba1\u7b97\u91cf\u6bd4\u8f83\u5927\u7684\u7f3a\u70b9\uff0c\u672c\u6587\u6539\u8fdb\u540e\u7684\u7b97\u6cd5\u91c7\u7528\u6784\u5efa\u6811\u72b6\u5206\u5c42\u7ed3\u6784\u9996\u5148\u5bf9\u9ad8\u5c42\u8fdb\u884c\u6bd4\u8f83\uff0c\u7136\u540e\u4f9d\u636e\u9ad8\u5c42\u6bd4\u8f83\u7ed3\u679c\u7684\u4e0d\u540c\uff0c\u518d\u4f9d\u6b21\u5bf9\u4e0b\u4e00\u5c42\u6b21\u8fdb\u884c\u6bd4\u8f83\uff0c\u76f8\u6bd4\u76f4\u63a5\u5bf9\u6240\u6709\u6587\u672c\u8fdb\u884c\u8ddd\u79bb\u8ba1\u7b97\uff0c\u8ba1\u7b97\u91cf\u660e\u663e\u51cf\u5c11\uff0c\u540c\u65f6\u63d0\u9ad8\u4e86\u8fd0\u7b97\u901f\u5ea6;b)\u5dee\u5206\u6bd4\u8f83\uff0c\u7531\u4e8e\u5927\u6570\u636e\u5177\u6709\u7c7b\u57df\u4ea4\u53c9\u6027\u7684\u7279\u70b9\uff0c\u8be5\u7b97\u6cd5\u4e0d\u662f\u5728\u6743\u91cd\u6bd4\u8f83\u7ed3\u675f\u540e\u76f4\u63a5\u8fdb\u884c\u5224\u65ad\uff0c\u800c\u662f\u53c8\u9488\u5bf9\u5927\u6570\u636e\u7684\u7c7b\u57df\u4ea4\u53c9\u6027\u8fdb\u884c\u4e86\u4e00\u6b21\u5dee\u5206\u6bd4\u8f83\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u9632\u6b62\u6700\u8fd1\u90bb\u548c\u6b21\u8fd1\u90bb\u8bef\u5224\u7684\u60c5\u51b5;c)\u52a8\u6001\u589e\u52a0\u7c7b\u522b\uff0c\u7531\u4e8e\u5927\u6570\u636e\u4e2d\u4fe1\u606f\u7684\u4e0d\u53ef\u9884\u77e5\u6027\uff0c\u8be5\u7b97\u6cd5\u9488\u5bf9\u6700\u7ec8\u6bd4\u8f83\u7ed3\u679c\u4e0d\u80fd\u5224\u65ad\u96b6\u5c5e\u4e8e\u54ea\u4e2a\u7c7b\u522b\u7684\u60c5\u51b5\uff0c\u5728\u7b97\u6cd5\u6700\u540e\u53ef\u4ee5\u52a8\u6001\u589e\u52a0\u65b0\u7c7b\u522b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"k-Nearest Neighbor\u5728\u6d77\u91cf\u6570\u636e\u7684\u60c5\u51b5\u4e0b\uff0c\u5199\u4e00\u6761\u6570\u636e\u5230flat file\uff0cA_id, B_id\uff0c [&hellip;]","protected":false},"author":1,"featured_media":25413,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/25412"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=25412"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/25412\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/25413"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=25412"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=25412"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=25412"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}