{"id":660,"date":"2022-07-18T23:44:05","date_gmt":"2022-07-20T19:51:43","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%9c%a8python%e4%b8%ad%e7%9a%84k-%e8%bf%91%e9%82%bb%e7%ae%97%e6%b3%95%ef%bc%88knn%ef%bc%89\/"},"modified":"2025-08-03T01:37:20","modified_gmt":"2025-08-02T17:37:20","slug":"%e5%9c%a8python%e4%b8%ad%e7%9a%84k-%e8%bf%91%e9%82%bb%e7%ae%97%e6%b3%95%ef%bc%88knn%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8python%e4%b8%ad%e7%9a%84k-%e8%bf%91%e9%82%bb%e7%ae%97%e6%b3%95%ef%bc%88knn%ef%bc%89\/","title":{"rendered":"Python\u5b9e\u73b0KNN\u7b97\u6cd5\uff1a\u5b8c\u6574\u6559\u7a0b\u4e0e\u5b9e\u4f8b\u89e3\u6790"},"content":{"rendered":"<p>k-\u6700\u8fd1\u90bb\u7b97\u6cd5\uff08kNN\uff09\u662f\u4e00\u79cd\u76d1\u7763\u5f0f\u673a\u5668\u5b66\u4e60\u6280\u672f\uff0c\u53ef\u7528\u4e8e\u5904\u7406\u5206\u7c7b\u548c\u56de\u5f52\u4efb\u52a1\u3002\u6211\u8ba4\u4e3aKNN\u662f\u4e00\u79cd\u6e90\u81ea\u5b9e\u9645\u751f\u6d3b\u7684\u7b97\u6cd5\u3002\u4eba\u4eec\u5f80\u5f80\u4f1a\u53d7\u5230\u5468\u56f4\u4eba\u7684\u5f71\u54cd\u3002<\/p>\n<h2>K-\u6700\u8fd1\u90bb\u7b97\u6cd5\u80cc\u540e\u7684\u601d\u60f3<\/h2>\n<p>\u6211\u4eec\u7684\u884c\u4e3a\u662f\u7531\u6211\u4eec\u4e00\u8d77\u957f\u5927\u7684\u4f19\u4f34\u6240\u5851\u9020\u7684\u3002\u6211\u4eec\u7684\u7236\u6bcd\u4e5f\u4ee5\u5404\u79cd\u65b9\u5f0f\u5851\u9020\u4e86\u6211\u4eec\u7684\u4e2a\u6027\u3002\u5982\u679c\u4f60\u5728\u559c\u6b22\u8fd0\u52a8\u7684\u4eba\u7fa4\u4e2d\u957f\u5927\uff0c\u5f88\u53ef\u80fd\u4f60\u4f1a\u559c\u6b22\u4e0a\u8fd0\u52a8\u3002\u5f53\u7136\u4e5f\u6709\u4f8b\u5916\u60c5\u51b5\u3002KNN\u7684\u5de5\u4f5c\u539f\u7406\u7c7b\u4f3c\u3002<\/p>\n<ol>\n<li>\u5982\u679c\u4f60\u6709\u4e00\u4e2a\u4eb2\u5bc6\u7684\u670b\u53cb\uff0c\u5e76\u4e14\u5927\u90e8\u5206\u65f6\u95f4\u90fd\u548c\u4ed6\/\u5979\u5728\u4e00\u8d77\uff0c\u6700\u7ec8\u4f60\u4eec\u4f1a\u62e5\u6709\u76f8\u4f3c\u7684\u5174\u8da3\u7231\u597d\u548c\u559c\u7231\u76f8\u540c\u7684\u4e8b\u7269\u3002\u8fd9\u5c31\u662fkNN\u7b97\u6cd5\uff0c\u5176\u4e2dk=1\u3002<\/li>\n<li>\u5982\u679c\u4f60\u7ecf\u5e38\u548c\u4e00\u4e2a\u75315\u4e2a\u4eba\u7ec4\u6210\u7684\u56e2\u4f53\u4e00\u8d77\u73a9\u800d\uff0c\u56e2\u4f53\u4e2d\u7684\u6bcf\u4e2a\u4eba\u5bf9\u4f60\u7684\u884c\u4e3a\u90fd\u6709\u5f71\u54cd\uff0c\u6700\u7ec8\u4f60\u4f1a\u53d8\u6210\u8fd9\u4e94\u4e2a\u4eba\u7684\u5e73\u5747\u503c\u3002\u8fd9\u5c31\u662fkNN\u7b97\u6cd5\uff0c\u5176\u4e2dk=5\u3002<\/li>\n<\/ol>\n<p>kNN\u5206\u7c7b\u5668\u4f7f\u7528\u591a\u6570\u6295\u7968\u539f\u5219\u6765\u786e\u5b9a\u6570\u636e\u70b9\u7684\u7c7b\u522b\u3002\u5982\u679ck\u8bbe\u5b9a\u4e3a5\uff0c\u5c06\u4f1a\u8003\u5bdf5\u4e2a\u6700\u8fd1\u70b9\u7684\u7c7b\u522b\u3002\u6839\u636e\u5360\u4f18\u52bf\u7684\u7c7b\u522b\u8fdb\u884c\u9884\u6d4b\u3002\u7c7b\u4f3c\u5730\uff0ckNN\u56de\u5f52\u4f1a\u4f7f\u75285\u4e2a\u6700\u8fd1\u4f4d\u7f6e\u7684\u5e73\u5747\u503c\u3002<\/p>\n<p>\u6211\u4eec\u662f\u5426\u76ee\u51fb\u8fc7\u90a3\u4e9b\u770b\u4f3c\u4eb2\u8fd1\u7684\u4eba\uff0c\u4f46\u6570\u636e\u70b9\u4e4b\u95f4\u5982\u4f55\u88ab\u8ba4\u4e3a\u662f\u4eb2\u8fd1\u7684\uff1f\u6570\u636e\u70b9\u4e4b\u95f4\u7684\u8ddd\u79bb\u662f\u88ab\u6d4b\u91cf\u7684\u3002\u6709\u5404\u79cd\u6280\u672f\u6765\u4f30\u7b97\u8ddd\u79bb\u3002\u6b27\u6c0f\u8ddd\u79bb\uff08\u5f53p=2\u65f6\u7684\u95f5\u53ef\u592b\u65af\u57fa\u8ddd\u79bb\uff09\u662f\u6700\u5e38\u7528\u7684\u8ddd\u79bb\u6d4b\u91cf\u4e4b\u4e00\u3002\u4e0b\u56fe\u89e3\u91ca\u4e86\u5982\u4f55\u8ba1\u7b97\u5728\u4e8c\u7ef4\u7a7a\u95f4\u4e2d\u4e24\u70b9\u4e4b\u95f4\u7684\u6b27\u6c0f\u8ddd\u79bb\u3002\u5b83\u662f\u901a\u8fc7\u4f4d\u7f6e\u7684x\u548cy\u5750\u6807\u5dee\u7684\u5e73\u65b9\u6765\u786e\u5b9a\u7684\u3002<\/p>\n<div>\n  <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647b20a4b2f92e6c72c058\/6-0.png\" class='post-images' alt=\"\u6b27\u6c0f\u8ddd\u79bb KNN\" title=\"\">\n<\/div>\n<h2>\u5728Python\u4e2d\u5b9e\u73b0KNN\u7b97\u6cd5<\/h2>\n<p>\u73b0\u5728\u8ba9\u6211\u4eec\u6765\u5b9e\u9645\u8fdb\u884cPython\u4e2d\u7684KNN\u5b9e\u73b0\u3002\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u6b65\u9aa4\uff0c\u5e2e\u52a9\u60a8\u5206\u89e3\u4ee3\u7801\u5e76\u66f4\u597d\u5730\u7406\u89e3\u5b83\u3002<\/p>\n<h3>\u5bfc\u5165\u6a21\u5757<\/h3>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">import<\/span> numpy <span class=\"token keyword\">as<\/span> np\r\n<span class=\"token keyword\">import<\/span> pandas <span class=\"token keyword\">as<\/span> pd\r\n\r\n<span class=\"token keyword\">import<\/span> matplotlib<span class=\"token punctuation\">.<\/span>pyplot <span class=\"token keyword\">as<\/span> plt\r\n\r\n<span class=\"token keyword\">from<\/span> sklearn<span class=\"token punctuation\">.<\/span>datasets <span class=\"token keyword\">import<\/span> make_blobs\r\n<span class=\"token keyword\">from<\/span> sklearn<span class=\"token punctuation\">.<\/span>neighbors <span class=\"token keyword\">import<\/span> KNeighborsClassifier\r\n<span class=\"token keyword\">from<\/span> sklearn<span class=\"token punctuation\">.<\/span>model_selection <span class=\"token keyword\">import<\/span> train_test_split\r\n<\/code><\/pre>\n<h3>2. \u521b\u5efa\u6570\u636e\u96c6<\/h3>\n<p>Scikit-learn\u62e5\u6709\u8bb8\u591a\u7528\u4e8e\u521b\u5efa\u5408\u6210\u6570\u636e\u96c6\u7684\u5de5\u5177\uff0c\u975e\u5e38\u9002\u7528\u4e8e\u6d4b\u8bd5\u673a\u5668\u5b66\u4e60\u7b97\u6cd5\u3002\u6211\u5c06\u4f7f\u7528make_blobs\u65b9\u6cd5\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<pre class=\"post-pre\"><code>X<span class=\"token punctuation\">,<\/span> y <span class=\"token operator\">=<\/span> make_blobs<span class=\"token punctuation\">(<\/span>n_samples <span class=\"token operator\">=<\/span> <span class=\"token number\">500<\/span><span class=\"token punctuation\">,<\/span> n_features <span class=\"token operator\">=<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> centers <span class=\"token operator\">=<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span>cluster_std <span class=\"token operator\">=<\/span> <span class=\"token number\">1.5<\/span><span class=\"token punctuation\">,<\/span> random_state <span class=\"token operator\">=<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>\u8fd9\u6bb5\u4ee3\u7801\u4f1a\u751f\u6210\u4e00\u4e2a\u5305\u542b500\u4e2a\u6837\u672c\u7684\u6570\u636e\u96c6\uff0c\u5206\u4e3a\u56db\u4e2a\u7c7b\u522b\uff0c\u603b\u5171\u6709\u4e24\u4e2a\u7279\u5f81\u3002\u4f7f\u7528\u5173\u8054\u7684\u53c2\u6570\uff0c\u60a8\u53ef\u4ee5\u5feb\u901f\u66f4\u6539\u6837\u672c\u6570\u91cf\u3001\u7279\u5f81\u548c\u7c7b\u522b\u3002\u6211\u4eec\u8fd8\u53ef\u4ee5\u66f4\u6539\u6bcf\u4e2a\u805a\u7c7b\uff08\u6216\u7c7b\u522b\uff09\u7684\u5206\u5e03\u3002<\/p>\n<h3>3. \u6570\u636e\u96c6\u53ef\u89c6\u5316<\/h3>\n<pre class=\"post-pre\"><code>plt<span class=\"token punctuation\">.<\/span>style<span class=\"token punctuation\">.<\/span>use<span class=\"token punctuation\">(<\/span><span class=\"token string\">'seaborn'<\/span><span class=\"token punctuation\">)<\/span>\r\nplt<span class=\"token punctuation\">.<\/span>figure<span class=\"token punctuation\">(<\/span>figsize <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\nplt<span class=\"token punctuation\">.<\/span>scatter<span class=\"token punctuation\">(<\/span>X<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> X<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> c<span class=\"token operator\">=<\/span>y<span class=\"token punctuation\">,<\/span> marker<span class=\"token operator\">=<\/span> <span class=\"token string\">'*'<\/span><span class=\"token punctuation\">,<\/span>s<span class=\"token operator\">=<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">,<\/span>edgecolors<span class=\"token operator\">=<\/span><span class=\"token string\">'black'<\/span><span class=\"token punctuation\">)<\/span>\r\nplt<span class=\"token punctuation\">.<\/span>show<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<div>\n  <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647b20a4b2f92e6c72c058\/17-0.png\" class='post-images' alt=\"\u6570\u636e\u53ef\u89c6\u5316 KNN\" title=\"\">\n<\/div>\n<h3>\u5c06\u6570\u636e\u5206\u6210\u8bad\u7ec3\u96c6\u548c\u6d4b\u8bd5\u96c6<\/h3>\n<p>\u5bf9\u4e8e\u6bcf\u4e2a\u76d1\u7763\u5f0f\u673a\u5668\u5b66\u4e60\u65b9\u6cd5\u6765\u8bf4\uff0c\u5c06\u6570\u636e\u96c6\u5212\u5206\u4e3a\u8bad\u7ec3\u96c6\u548c\u6d4b\u8bd5\u96c6\u975e\u5e38\u91cd\u8981\u3002\u6211\u4eec\u9996\u5148\u8bad\u7ec3\u6a21\u578b\uff0c\u7136\u540e\u5728\u6570\u636e\u96c6\u7684\u4e0d\u540c\u90e8\u5206\u8fdb\u884c\u6d4b\u8bd5\u3002\u5982\u679c\u6211\u4eec\u4e0d\u5bf9\u6570\u636e\u8fdb\u884c\u5206\u79bb\uff0c\u5b9e\u9645\u4e0a\u662f\u5728\u4f7f\u7528\u6a21\u578b\u5df2\u7ecf\u4e86\u89e3\u7684\u6570\u636e\u8fdb\u884c\u6d4b\u8bd5\u3002\u4f7f\u7528train_test_split\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u7b80\u5355\u5730\u5c06\u6d4b\u8bd5\u5206\u79bb\u51fa\u6765\u3002<\/p>\n<pre class=\"post-pre\"><code>X_train<span class=\"token punctuation\">,<\/span> X_test<span class=\"token punctuation\">,<\/span> y_train<span class=\"token punctuation\">,<\/span> y_test <span class=\"token operator\">=<\/span> train_test_split<span class=\"token punctuation\">(<\/span>X<span class=\"token punctuation\">,<\/span> y<span class=\"token punctuation\">,<\/span> random_state <span class=\"token operator\">=<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>\u901a\u8fc7\u8bad\u7ec3\u96c6\u5927\u5c0f\u548c\u6d4b\u8bd5\u96c6\u5927\u5c0f\u9009\u9879\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u5b9a\u539f\u59cb\u6570\u636e\u4e2d\u5206\u522b\u7528\u4e8e\u8bad\u7ec3\u548c\u6d4b\u8bd5\u96c6\u7684\u6bd4\u4f8b\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u8bad\u7ec3\u96c6\u5360\u603b\u6570\u636e\u768475%\uff0c\u6d4b\u8bd5\u96c6\u536025%\u3002<\/p>\n<h3>5. KNN\u5206\u7c7b\u5668\u7684\u5b9e\u73b0<\/h3>\n<p>\u7136\u540e\uff0c\u6211\u4eec\u5c06\u6784\u5efa\u4e00\u4e2aKNN\u5206\u7c7b\u5668\u5bf9\u8c61\u3002\u6211\u4f7f\u7528k\u503c\u4e3a1\u548c5\u5f00\u53d1\u4e86\u4e24\u4e2a\u5206\u7c7b\u5668\uff0c\u4ee5\u5c55\u793ak\u503c\u7684\u76f8\u5173\u6027\u3002\u7136\u540e\u4f7f\u7528\u8bad\u7ec3\u96c6\u5bf9\u8fd9\u4e9b\u6a21\u578b\u8fdb\u884c\u8bad\u7ec3\u3002\u9009\u62e9k\u503c\u662f\u4f7f\u7528n_neighbors\u53c2\u6570\u5b8c\u6210\u7684\u3002\u56e0\u4e3a\u9ed8\u8ba4\u503c\u4e3a5\uff0c\u6240\u4ee5\u4e0d\u9700\u8981\u663e\u5f0f\u5730\u6307\u5b9a\u3002<\/p>\n<pre class=\"post-pre\"><code>knn5 <span class=\"token operator\">=<\/span> KNeighborsClassifier<span class=\"token punctuation\">(<\/span>n_neighbors <span class=\"token operator\">=<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span>\r\nknn1 <span class=\"token operator\">=<\/span> KNeighborsClassifier<span class=\"token punctuation\">(<\/span>n_neighbors<span class=\"token operator\">=<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<h3>6. KNN\u5206\u7c7b\u5668\u7684\u9884\u6d4b<\/h3>\n<p>\u7136\u540e\uff0c\u5728\u6d4b\u8bd5\u96c6\u4e2d\uff0c\u6211\u4eec\u9884\u6d4b\u76ee\u6807\u503c\u5e76\u5c06\u5176\u4e0e\u5b9e\u9645\u503c\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n<pre class=\"post-pre\"><code>knn5<span class=\"token punctuation\">.<\/span>fit<span class=\"token punctuation\">(<\/span>X_train<span class=\"token punctuation\">,<\/span> y_train<span class=\"token punctuation\">)<\/span>\r\nknn1<span class=\"token punctuation\">.<\/span>fit<span class=\"token punctuation\">(<\/span>X_train<span class=\"token punctuation\">,<\/span> y_train<span class=\"token punctuation\">)<\/span>\r\n\r\ny_pred_5 <span class=\"token operator\">=<\/span> knn5<span class=\"token punctuation\">.<\/span>predict<span class=\"token punctuation\">(<\/span>X_test<span class=\"token punctuation\">)<\/span>\r\ny_pred_1 <span class=\"token operator\">=<\/span> knn1<span class=\"token punctuation\">.<\/span>predict<span class=\"token punctuation\">(<\/span>X_test<span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<h3>7. \u9884\u6d4bk\u503c\u7684\u51c6\u786e\u5ea6<\/h3>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">from<\/span> sklearn<span class=\"token punctuation\">.<\/span>metrics <span class=\"token keyword\">import<\/span> accuracy_score\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"k=5\u65f6\u7684\u51c6\u786e\u5ea6\"<\/span><span class=\"token punctuation\">,<\/span> accuracy_score<span class=\"token punctuation\">(<\/span>y_test<span class=\"token punctuation\">,<\/span> y_pred_5<span class=\"token punctuation\">)<\/span><span class=\"token operator\">*<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"k=1\u65f6\u7684\u51c6\u786e\u5ea6\"<\/span><span class=\"token punctuation\">,<\/span> accuracy_score<span class=\"token punctuation\">(<\/span>y_test<span class=\"token punctuation\">,<\/span> y_pred_1<span class=\"token punctuation\">)<\/span><span class=\"token operator\">*<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>k\u503c\u7684\u51c6\u786e\u6027\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"post-pre\"><code>k<span class=\"token operator\">=<\/span><span class=\"token number\">5<\/span>\u65f6\u7684\u51c6\u786e\u5ea6 <span class=\"token number\">93.60000000000001<\/span>\r\nk<span class=\"token operator\">=<\/span><span class=\"token number\">1<\/span>\u65f6\u7684\u51c6\u786e\u5ea6 <span class=\"token number\">90.4<\/span>\r\n<\/code><\/pre>\n<h3>8. \u9884\u6d4b\u53ef\u89c6\u5316<\/h3>\n<p>\u8ba9\u6211\u4eec\u4ee5 k=5 \u548c k=1 \u7684\u503c\u6765\u89c2\u5bdf\u6d4b\u8bd5\u96c6\u548c\u9884\u6d4b\u503c\uff0c\u770b\u770b k \u503c\u7684\u5f71\u54cd\u3002<\/p>\n<pre class=\"post-pre\"><code>plt<span class=\"token punctuation\">.<\/span>figure<span class=\"token punctuation\">(<\/span>figsize <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">15<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\nplt<span class=\"token punctuation\">.<\/span>subplot<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span>\r\nplt<span class=\"token punctuation\">.<\/span>scatter<span class=\"token punctuation\">(<\/span>X_test<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> X_test<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> c<span class=\"token operator\">=<\/span>y_pred_5<span class=\"token punctuation\">,<\/span> marker<span class=\"token operator\">=<\/span> <span class=\"token string\">'*'<\/span><span class=\"token punctuation\">,<\/span> s<span class=\"token operator\">=<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">,<\/span>edgecolors<span class=\"token operator\">=<\/span><span class=\"token string\">'black'<\/span><span class=\"token punctuation\">)<\/span>\r\nplt<span class=\"token punctuation\">.<\/span>title<span class=\"token punctuation\">(<\/span><span class=\"token string\">\"k=5\u65f6\u7684\u9884\u6d4b\u503c\"<\/span><span class=\"token punctuation\">,<\/span> fontsize<span class=\"token operator\">=<\/span><span class=\"token number\">20<\/span><span class=\"token punctuation\">)<\/span>\r\n\r\nplt<span class=\"token punctuation\">.<\/span>subplot<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span>\r\nplt<span class=\"token punctuation\">.<\/span>scatter<span class=\"token punctuation\">(<\/span>X_test<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> X_test<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> c<span class=\"token operator\">=<\/span>y_pred_1<span class=\"token punctuation\">,<\/span> marker<span class=\"token operator\">=<\/span> <span class=\"token string\">'*'<\/span><span class=\"token punctuation\">,<\/span> s<span class=\"token operator\">=<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">,<\/span>edgecolors<span class=\"token operator\">=<\/span><span class=\"token string\">'black'<\/span><span class=\"token punctuation\">)<\/span>\r\nplt<span class=\"token punctuation\">.<\/span>title<span class=\"token punctuation\">(<\/span><span class=\"token string\">\"k=1\u65f6\u7684\u9884\u6d4b\u503c\"<\/span><span class=\"token punctuation\">,<\/span> fontsize<span class=\"token operator\">=<\/span><span class=\"token number\">20<\/span><span class=\"token punctuation\">)<\/span>\r\nplt<span class=\"token punctuation\">.<\/span>show<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<div>\n    <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647b20a4b2f92e6c72c058\/35-0.png\" class='post-images' alt=\"KNN\u9884\u6d4b\u53ef\u89c6\u5316\" title=\"KNN\u9884\u6d4b\u53ef\u89c6\u5316\"><\/p>\n<h2>\u5982\u4f55\u627e\u5230\u6700\u4f73\u7684k\u503c\u6765\u5b9e\u73b0KNN\u7b97\u6cd5<\/h2>\n<ol>\n<li>k=1\uff1a\u6a21\u578b\u8fc7\u4e8e\u72ed\u7a84\u4e14\u6cdb\u5316\u80fd\u529b\u4e0d\u8db3\uff0c\u5bf9\u566a\u58f0\u975e\u5e38\u654f\u611f\u3002\u8be5\u6a21\u578b\u5728\u8bad\u7ec3\u96c6\u4e0a\u5bf9\u65b0\u7684\u3001\u4ee5\u524d\u672a\u77e5\u7684\u6570\u636e\u70b9\u8fdb\u884c\u9ad8\u5ea6\u51c6\u786e\u7684\u9884\u6d4b\uff0c\u4f46\u5728\u5168\u65b0\u7684\u3001\u4ee5\u524d\u672a\u89c1\u7684\u6570\u636e\u70b9\u4e0a\u5374\u662f\u4e00\u4e2a\u8f83\u5dee\u7684\u9884\u6d4b\u5668\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u5f88\u53ef\u80fd\u5f97\u5230\u4e00\u4e2a\u8fc7\u62df\u5408\u7684\u6a21\u578b\u3002<\/li>\n<li>k=100\uff1a\u8be5\u6a21\u578b\u8fc7\u4e8e\u5bbd\u6cdb\uff0c\u5728\u8bad\u7ec3\u96c6\u548c\u6d4b\u8bd5\u96c6\u4e0a\u90fd\u4e0d\u53ef\u9760\u3002\u6b64\u79cd\u60c5\u51b5\u88ab\u79f0\u4e3a\u6b20\u62df\u5408\u3002<\/li>\n<\/ol>\n<h2>KNN\u7b97\u6cd5\u7684\u9650\u5236<\/h2>\n<p>KNN\u662f\u4e00\u4e2a\u7b80\u5355\u6613\u61c2\u7684\u7b97\u6cd5\u3002\u5b83\u4e0d\u4f9d\u8d56\u4e8e\u4efb\u4f55\u5185\u90e8\u673a\u5668\u5b66\u4e60\u6a21\u578b\u6765\u751f\u6210\u9884\u6d4b\u3002KNN\u662f\u4e00\u79cd\u5206\u7c7b\u65b9\u6cd5\uff0c\u53ea\u9700\u77e5\u9053\u6709\u591a\u5c11\u4e2a\u7c7b\u522b\u5c31\u53ef\u4ee5\u5de5\u4f5c\uff08\u4e00\u4e2a\u6216\u591a\u4e2a\uff09\u3002\u8fd9\u610f\u5473\u7740\u5b83\u53ef\u4ee5\u5feb\u901f\u8bc4\u4f30\u662f\u5426\u5e94\u8be5\u6dfb\u52a0\u4e00\u4e2a\u65b0\u7684\u7c7b\u522b\uff0c\u800c\u65e0\u9700\u77e5\u9053\u5176\u4ed6\u7c7b\u522b\u7684\u6570\u91cf\u3002<\/p>\n<p>\u8fd9\u79cd\u7b80\u5355\u6027\u7684\u7f3a\u70b9\u662f\u5b83\u65e0\u6cd5\u9884\u6d4b\u5f02\u5e38\u60c5\u51b5\uff08\u5982\u65b0\u75be\u75c5\uff09\uff0c\u8fd9\u662fKNN\u65e0\u6cd5\u5b8c\u6210\u7684\uff0c\u56e0\u4e3a\u5b83\u4e0d\u77e5\u9053\u5728\u5065\u5eb7\u4eba\u7fa4\u4e2d\u7f55\u89c1\u9879\u76ee\u7684\u666e\u904d\u7a0b\u5ea6\u3002<\/p>\n<p>\u5c3d\u7ba1KNN\u5728\u6d4b\u8bd5\u96c6\u4e0a\u80fd\u591f\u8fbe\u5230\u8f83\u9ad8\u7684\u51c6\u786e\u5ea6\uff0c\u4f46\u5728\u65f6\u95f4\u548c\u5185\u5b58\u65b9\u9762\u5b83\u8f83\u6162\u4e14\u66f4\u6602\u8d35\u3002\u4e3a\u4e86\u8fdb\u884c\u9884\u6d4b\uff0c\u5b83\u9700\u8981\u76f8\u5f53\u5927\u7684\u5185\u5b58\u6765\u5b58\u50a8\u6574\u4e2a\u8bad\u7ec3\u6570\u636e\u96c6\u3002\u6b64\u5916\uff0c\u7531\u4e8e\u6b27\u51e0\u91cc\u5f97\u8ddd\u79bb\u5bf9\u6570\u636e\u7684\u5927\u5c0f\u5177\u6709\u5f88\u9ad8\u7684\u654f\u611f\u6027\uff0c\u5177\u6709\u5927\u6570\u503c\u7279\u5f81\u7684\u6570\u636e\u5c06\u59cb\u7ec8\u6bd4\u5177\u6709\u5c0f\u6570\u503c\u7279\u5f81\u7684\u6570\u636e\u66f4\u4e3a\u91cd\u8981\u3002<\/p>\n<p>\u6700\u540e\uff0c\u5728\u8003\u8651\u5230\u6211\u4eec\u6240\u8ba8\u8bba\u7684\u4e00\u5207\u4e4b\u540e\uff0c\u6211\u4eec\u5e94\u8be5\u8bb0\u4f4fKNN\u5e76\u4e0d\u9002\u7528\u4e8e\u5927\u7ef4\u5ea6\u7684\u6570\u636e\u96c6\u3002<\/p>\n<h2>\u7ed3\u8bba<\/h2>\n<p>\u5e0c\u671b\u4f60\u73b0\u5728\u5bf9KNN\u7b97\u6cd5\u6709\u4e86\u66f4\u597d\u7684\u7406\u89e3\u3002\u6211\u4eec\u5df2\u7ecf\u63a2\u8ba8\u4e86\u591a\u79cd\u5173\u4e8eKNN\u5982\u4f55\u4fdd\u5b58\u5b8c\u6574\u6570\u636e\u96c6\u4ee5\u751f\u6210\u9884\u6d4b\u7684\u601d\u8def\u3002<\/p>\n<p>KNN\u662f\u51e0\u79cd\u60f0\u6027\u5b66\u4e60\u7b97\u6cd5\u4e4b\u4e00\uff0c\u5b83\u4e0d\u4f7f\u7528\u5b66\u4e60\u6a21\u578b\u8fdb\u884c\u9884\u6d4b\u3002\u901a\u8fc7\u8ba1\u7b97\u4f20\u5165\u89c2\u6d4b\u4e0e\u5df2\u6709\u6570\u636e\u4e4b\u95f4\u7684\u76f8\u4f3c\u6027\u7684\u5e73\u5747\u503c\uff0cKNN\u5b9e\u65f6\u751f\u6210\u9884\u6d4b\u3002<\/p>\n<p>\u8c22\u8c22\u4f60\u7684\u9605\u8bfb\uff01<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>k-\u6700\u8fd1\u90bb\u7b97\u6cd5\uff08kNN\uff09\u662f\u4e00\u79cd\u76d1\u7763\u5f0f\u673a\u5668\u5b66\u4e60\u6280\u672f\uff0c\u53ef\u7528\u4e8e\u5904\u7406\u5206\u7c7b\u548c\u56de\u5f52\u4efb\u52a1\u3002\u6211\u8ba4\u4e3aKNN\u662f\u4e00\u79cd\u6e90\u81ea\u5b9e\u9645\u751f\u6d3b\u7684\u7b97 [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1842,32,811,370,786],"class_list":["post-660","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-knn","tag-python","tag-811","tag-370","tag-786"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Python\u5b9e\u73b0KNN\u7b97\u6cd5\uff1a\u5b8c\u6574\u6559\u7a0b\u4e0e\u5b9e\u4f8b\u89e3\u6790 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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