{"id":18532,"date":"2021-05-07T15:37:58","date_gmt":"2021-05-07T07:37:58","guid":{"rendered":"https:\/\/blog.tibame.com\/?p=18532"},"modified":"2021-06-28T11:47:29","modified_gmt":"2021-06-28T03:47:29","slug":"ai60%e5%95%8f-q26%e4%bb%80%e9%ba%bc%e6%98%afk%ef%bc%88k-nearest-neighbor%ef%bc%89%e9%84%b0%e8%bf%91%e7%ae%97%e6%b3%95%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/blog.tibame.com\/?p=18532","title":{"rendered":"\u3010AI60\u554f\u3011Q26\u4ec0\u9ebc\u662fk\uff08k-Nearest Neighbor\uff09\u9130\u8fd1\u7b97\u6cd5\uff1f"},"content":{"rendered":"\n<p>KNN\uff08k-Nearest Neighbor\uff09\u53c8\u88ab\u7a31\u70ba\u300c\u8fd1\u9130\u7b97\u6cd5\u300d\uff0c \u5b83\u662f<strong>\u76e3\u7763\u5f0f\u6a5f\u5668\u5b78\u7fd2<\/strong>\u4e2d\u5206\u985e\u6f14\u7b97\u6cd5\u7684\u4e00\u7a2e\u3002KNN\u7684\u4e3b\u8981\u6982\u5ff5\u662f\u5229\u7528\u6a23\u672c\u9ede\u8ddf\u6a23\u672c\u9ede\u4e4b\u9593\u7279\u5fb5\u7684\u8ddd\u96e2\u9060\u8fd1\uff0c\u9032\u4e00\u6b65\u5224\u65b7\u65b0\u7684\u8cc7\u6599\u6bd4\u8f03\u50cf\u54ea\u4e00\u985e\u3002<strong>KNN\u4e2d\u7684k\u503c\u5c31\u662f\u8a08\u7b97\u6709\u5e7e\u500b\u6700\u63a5\u8fd1\u7684\u9130\u5c45\u3002<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><strong>\u5b83\u7684\u6838\u5fc3\u601d\u60f3\u662f\uff1a\u7269\u4ee5\u985e\u805a\uff0c\u4eba\u4ee5\u7fa4\u5206<\/strong><\/pre>\n\n\n\n<p>\u5047\u8a2d\u4e00\u500b\u672a\u77e5\u6a23\u672c\u6578\u64dax\u9700\u8981\u6b78\u985e\uff0c\u7e3d\u5171\u6709ABC\u4e09\u500b\u985e\u5225\uff0c\u90a3\u9ebc\u96e2x\u8ddd\u96e2\u6700\u8fd1\u7684\u6709k\u500b\u9130\u5c45\uff0c\u9019k\u500b\u9130\u5c45\u91cc\u6709k1\u500b\u9130\u5c45\u5c6c\u65bcA\u985e\uff0ck2\u500b\u9130\u5c45\u5c6c\u65bcB\u985e\uff0ck3\u500b\u9130\u5c45\u5c6c\u65bcC\u985e\uff0c\u5982\u679ck1&gt;k2&gt;k3\uff0c\u90a3\u9ebcx\u5c31\u5c6c\u65bcA\u985e\uff0c\u4e5f\u5c31\u662f\u8aaax\u7684\u985e\u5225\u5b8c\u5168\u7531\u9130\u5c45\u4f86\u63a8\u65b7\u51fa\u4f86\u3002<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u5167\u5bb9\u76ee\u9304<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"\u986f\u793a\/\u96b1\u85cf\u5167\u5bb9\u76ee\u9304\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/blog.tibame.com\/?p=18532\/#KNN%E9%84%B0%E8%BF%91%E7%AE%97%E6%B3%95%E6%93%8D%E4%BD%9C%E6%AD%A5%E9%A9%9F\" >KNN\u9130\u8fd1\u7b97\u6cd5\u64cd\u4f5c\u6b65\u9a5f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/blog.tibame.com\/?p=18532\/#KNN%E7%9A%84%E5%84%AA%E9%BB%9E%E8%88%87%E7%BC%BA%E9%BB%9E\" >KNN\u7684\u512a\u9ede\u8207\u7f3a\u9ede<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/blog.tibame.com\/?p=18532\/#KNN%E7%9A%84%E6%A1%88%E4%BE%8B\" >KNN\u7684\u6848\u4f8b<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"KNN%E9%84%B0%E8%BF%91%E7%AE%97%E6%B3%95%E6%93%8D%E4%BD%9C%E6%AD%A5%E9%A9%9F\"><\/span>KNN\u9130\u8fd1\u7b97\u6cd5\u64cd\u4f5c\u6b65\u9a5f<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p style=\"text-align:left\"> \u6309\u7167\u8ddd\u96e2\u7684\u9060\u8fd1\u9806\u5e8f\uff0c\u7d71\u8a08k\u500b\u9130\u5c45\u7684\u985e\u5225\u983b\u7387\uff0c\u6211\u5011\u53ef\u4ee5\u7c21\u5316\u70ba\uff1a\u627e\u9130\u5c45 + \u6295\u7968\u6c7a\u5b9a \u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u7b97\u8ddd\u96e2\uff1a\u7d66\u5b9a\u672a\u77e5\u7269\u4ef6\uff0c\u8a08\u7b97\u5b83\u8207\u8a13\u7df4\u96c6\u4e2d\u7684\u6bcf\u500b\u7269\u4ef6\u7684\u8ddd\u96e2<\/li><li>\u627e\u8fd1\u9130\uff1a\u5708\u5b9a\u8ddd\u96e2\u6700\u8fd1\u7684k\u500b\u8a13\u7df4\u7269\u4ef6\uff0c\u4f5c\u70ba\u672a\u77e5\u7269\u4ef6\u7684\u8fd1\u9130<\/li><li>\u505a\u5206\u985e\uff1a\u5728\u9019k\u500b\u8fd1\u9130\u4e2d\u51fa\u7dda\u6b21\u6578\u6700\u591a\u7684\u985e\u5225\u5c31\u662f\u6e2c\u8a66\u7269\u4ef6\u7684\u9810\u6e2c\u985e\u5225<\/li><\/ol>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"KNN%E7%9A%84%E5%84%AA%E9%BB%9E%E8%88%87%E7%BC%BA%E9%BB%9E\"><\/span>KNN\u7684\u512a\u9ede\u8207\u7f3a\u9ede<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u512a\u9ede<\/p>\n\n\n\n<p>\u2014 \u8a13\u7df4\u6642\u9593\u8907\u96dc\u5ea6\u6bd4\u652f\u63f4\u5411\u91cf\u6a5f\u4e4b\u985e\u7684\u6f14\u7b97\u6cd5\u4f4e  <br \/>\u2014 \u975e\u5e38\u7c21\u55ae\u7684\u5206\u985e\u7b97\u6cd5\u6c92\u6709\u4e4b\u4e00\uff0c\u4eba\u6027\u5316\uff0c\u6613\u65bc\u7406\u89e3\uff0c\u6613\u65bc\u5be6\u73fe<br \/>\u2014 \u9069\u5408\u8655\u7406\u591a\u5206\u985e\u554f\u984c\uff0c\u6bd4\u5982\u63a8\u85a6\u7528\u6236<br \/>\u2014  \u7406\u8ad6\u6210\u719f\uff0c\u601d\u60f3\u7c21\u55ae\uff0c\u65e2\u53ef\u4ee5\u7528\u4f86\u505a\u5206\u985e\u53c8\u53ef\u4ee5\u505a\u8ff4\u6b78<\/p>\n\n\n\n<p>\u7f3a\u9ede<\/p>\n\n\n\n<p>\u2014  \u5c6c\u65bc\u61f6\u60f0\u7b97\u6cd5\uff0c\u6642\u9593\u8907\u96dc\u5ea6\u8f03\u9ad8\uff0c\u56e0\u70ba\u9700\u8981\u8a08\u7b97\u672a\u77e5\u6a23\u672c\u5230\u6240\u6709\u5df2\u77e5\u6a23\u672c\u7684\u8ddd\u96e2<br \/>\u2014  \u6a23\u672c\u5e73\u8861\u5ea6\u4f9d\u8cf4\u9ad8\uff0c\u7576\u51fa\u73fe\u6975\u7aef\u60c5\u6cc1\u6a23\u672c\u4e0d\u5e73\u8861\u6642\uff0c\u5206\u985e\u7d55\u5c0d\u6703\u51fa\u73fe\u504f\u5dee<br \/>\u2014  \u53ef\u89e3\u91cb\u6027\u5dee\uff0c\u7121\u6cd5\u7d66\u51fa\u985e\u4f3c\u6c7a\u7b56\u6a39\u90a3\u6a23\u7684\u898f\u5247<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"KNN%E7%9A%84%E6%A1%88%E4%BE%8B\"><\/span>KNN\u7684\u6848\u4f8b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5148\u524d\u5728<a href=\"https:\/\/blog.wiedu.tw\/?p=17923\">Q23\u4ec0\u9ebc\u662f\u6c7a\u7b56\u6a39\u6f14\u7b97\u6cd5\uff1f<\/a>\u6848\u4f8b\u4e2d\uff0c\u63d0\u5230\u4e86\u62ab\u85a9\u5e97\u9867\u5ba2\u6eff\u610f\u5ea6\u7684\u4f8b\u5b50\uff0c\u82e5\u5957\u7528\u5728KNN\u6f14\u7b97\u6cd5\u4e2d\uff0c\u53c8\u662f\u5982\u4f55\u64cd\u4f5c\uff1f<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u4ee5\u62ab\u85a9\u5916\u9001\u5e97\u7684\u9867\u5ba2\u8a55\u50f9\u6eff\u610f\u5ea6\u70ba\u4f8b\uff0c\n\u70e4\u7bb1\u6eab\u5ea6\u8207\u70e4\u7bb1\u6fd5\u5ea6\u5fae\u7279\u5fb5\u4f5c\u5206\u5e03\u5716\uff0c\n\u9032\u884cKNN\u7684\u7bc4\u4f8b\u63a8\u6f14\u3002\n\n\u5728\u4e0b\u571626-1\u4e2d\uff0ck\u503c\u8a2d\u5b9a\u70ba2\uff0c\n\u4e5f\u5c31\u662f\u8981\u627e\u5230\u6700\u9760\u8fd1\u76ee\u6a197\u7684\u5169\u500b\u9ede(\u5169\u500b\u6700\u8fd1\u7684\u9130\u5c45)\uff0c\n\u5206\u5225\u5f97\u5230\u4e86\u7de8\u865f2\u8207\u7de8\u865f6\u3002\n\u7de8\u865f7\u548c\u7de8\u865f2\u7684\u8ddd\u96e2\u662f d<sub>27<\/sub> = \u6839\u865f2\uff0c\n\u7de8\u865f7\u548c\u7de8\u865f6\u7684\u8ddd\u96e2\u662fd<sub>67<\/sub>=3\u3002\n\n\u7576k=2\u6642\uff0c\n\u9760\u8fd1\u7684\u5169\u500b\u9ede\u843d\u5728\u6eff\u610f\u548c\u4e0d\u6eff\u610f\u7684\u5404\u6709\u4e00\u500b\uff0c\n\u56e0\u6b64\u7121\u6cd5\u63a8\u6e2c\u7de8\u865f7\u662f\u6eff\u610f\u6216\u4e0d\u6eff\u610f\u3002<\/pre>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img decoding=\"async\" src=\"https:\/\/blog.wiedu.tw\/wp-content\/uploads\/2021\/05\/image-5.png\" alt=\"\" class=\"wp-image-18604\" width=\"431\" height=\"351\" srcset=\"https:\/\/blog.tibame.com\/wp-content\/uploads\/2021\/05\/image-5.png 629w, https:\/\/blog.tibame.com\/wp-content\/uploads\/2021\/05\/image-5-300x244.png 300w, https:\/\/blog.tibame.com\/wp-content\/uploads\/2021\/05\/image-5-585x476.png 585w\" sizes=\"(max-width: 431px) 100vw, 431px\" \/><figcaption>\u571626-1\uff0ck=2\u6642\u7684\u62ab\u85a9\u5916\u9001\u5e97\u9867\u5ba2\u8a55\u50f9\u6eff\u610f\u5ea6\u4e4bKNN<\/figcaption><\/figure>\n\n\n\n<pre class=\"wp-block-preformatted\">\u6848\u4f8b2\uff1a\u6aa2\u6e2c\u5b78\u751f\u662f\u5426\u5065\u5eb7\u3002\n\u5982\u4e0b\u571626-2\u6240\u793a\uff0c\n\u6211\u5011\u6709\u5b78\u751f1,2,3,4,5\uff08\u65b0\u5b78\u751f\uff09\u7684\u76f8\u95dc\u5c6c\u6027\u6578\u64da\uff08\u9ad4\u91cd\u3001\u8eab\u9ad8\uff09\uff0c\n\u5176\u4e2d\u5b78\u751f1,2,3,4\u5728\u5177\u5099\u76f8\u95dc\u5c6c\u6027\u57fa\u790e\u4e0a\uff0c\n\u9084\u6709\u76ee\u6a19\u5c6c\u6027\u6a19\u7c64\uff08\u662f\u5426\u5065\u5eb7\uff09\u3002\n\n\u6211\u5011\u7684\u554f\u984c\u662f\u901a\u904e\u5c0d\u5b78\u751f1,2,3,4\u7684\u76f8\u95dc\u5c6c\u6027\u3001\u76ee\u6a19\u5c6c\u6027\u6578\u64da\u9032\u884c\u5b78\u7fd2\uff0c\n\u7136\u5f8c\u5c0d\u5b78\u751f5\uff08\u5373\u65b0\u5b78\u751f\uff09\u662f\u5426\u5065\u5eb7\u505a\u51fa\u9810\u6e2c\uff1f<\/pre>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img decoding=\"async\" src=\"https:\/\/blog.wiedu.tw\/wp-content\/uploads\/2021\/05\/week6\u88fd\u5716_26-1-1024x748.png\" alt=\"\" class=\"wp-image-18533\" width=\"392\" height=\"286\" srcset=\"https:\/\/blog.tibame.com\/wp-content\/uploads\/2021\/05\/week6\u88fd\u5716_26-1-1024x748.png 1024w, https:\/\/blog.tibame.com\/wp-content\/uploads\/2021\/05\/week6\u88fd\u5716_26-1-300x219.png 300w, https:\/\/blog.tibame.com\/wp-content\/uploads\/2021\/05\/week6\u88fd\u5716_26-1-768x561.png 768w, https:\/\/blog.tibame.com\/wp-content\/uploads\/2021\/05\/week6\u88fd\u5716_26-1-1170x854.png 1170w, https:\/\/blog.tibame.com\/wp-content\/uploads\/2021\/05\/week6\u88fd\u5716_26-1-585x427.png 585w, https:\/\/blog.tibame.com\/wp-content\/uploads\/2021\/05\/week6\u88fd\u5716_26-1.png 1542w\" sizes=\"(max-width: 392px) 100vw, 392px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img decoding=\"async\" src=\"https:\/\/blog.wiedu.tw\/wp-content\/uploads\/2021\/05\/week6\u88fd\u5716_26-2-1024x838.png\" alt=\"\" class=\"wp-image-18534\" width=\"412\" height=\"337\" srcset=\"https:\/\/blog.tibame.com\/wp-content\/uploads\/2021\/05\/week6\u88fd\u5716_26-2-1024x838.png 1024w, https:\/\/blog.tibame.com\/wp-content\/uploads\/2021\/05\/week6\u88fd\u5716_26-2-300x245.png 300w, https:\/\/blog.tibame.com\/wp-content\/uploads\/2021\/05\/week6\u88fd\u5716_26-2-768x628.png 768w, https:\/\/blog.tibame.com\/wp-content\/uploads\/2021\/05\/week6\u88fd\u5716_26-2-1170x957.png 1170w, https:\/\/blog.tibame.com\/wp-content\/uploads\/2021\/05\/week6\u88fd\u5716_26-2-585x479.png 585w, https:\/\/blog.tibame.com\/wp-content\/uploads\/2021\/05\/week6\u88fd\u5716_26-2.png 1376w\" sizes=\"(max-width: 412px) 100vw, 412px\" \/><figcaption> \u571626-2  \u6aa2\u6e2c\u5b78\u751f\u662f\u5426\u5065\u5eb7 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class=\"wp-block-list\"><li>\u672a\u5206\u985e\u6a19\u7c64\u6578\u64da\u8207\u5df2\u77e5\u6578\u64da\u4e00\u4e00\u8a08\u7b97\u8ddd\u96e2<\/li><li>\u57281\u57fa\u790e\u4e0a\uff0c\u627e\u5230\u6700\u70ba\u76f8\u8fd1\u7684k\u500b\u9130\u5c45<\/li><li>k\u500b\u9130\u5c45\u7684\u985e\u5225\u7d71\u8a08\uff0c\u5c07\u6700\u591a\u985e\u5225\u7684\u6a19\u7c64\u8ce6\u503c\u7d66\u672a\u5206\u985e\u6a19\u7c64\u6578\u64da<\/li><\/ol>\n\n\n\n<p>\u63a5\u4e0b\u4f86\uff0c\u6211\u5011\u4ecd\u820a\u4ee5\u4e0a\u8ff0\u5b78\u751f1,2,3,4,5\uff08\u65b0\u5b78\u751f\uff09\u70ba\u4f8b\uff0c\u5047\u8a2d\u81ea\u5b9a\u7fa9k\u503c\u70ba3\uff0c\u8ddd\u96e2\u63a1\u7528\u6b50\u5f0f\u8ddd\u96e2\u8a08\u7b97\uff0c\u7528x\u4ee3\u8868\u9ad4\u91cd\uff0cy\u4ee3\u8868\u8eab\u9ad8\u3002<\/p>\n\n\n\n<p>\u90a3\u9ebc\u7d50\u5408\u7b97\u8a08\u6b65\u9a5f\uff1a<\/p>\n\n\n\n<h4 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