{"id":2237,"date":"2023-07-23T03:24:57","date_gmt":"2023-07-23T03:24:57","guid":{"rendered":"https:\/\/statorials.org\/cn\/python-%e4%b8%ad%e7%9a%84%e7%83%ad%e7%bc%96%e7%a0%81\/"},"modified":"2023-07-23T03:24:57","modified_gmt":"2023-07-23T03:24:57","slug":"python-%e4%b8%ad%e7%9a%84%e7%83%ad%e7%bc%96%e7%a0%81","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/python-%e4%b8%ad%e7%9a%84%e7%83%ad%e7%bc%96%e7%a0%81\/","title":{"rendered":"\u5982\u4f55\u5728 python \u4e2d\u6267\u884c one-hot \u7f16\u7801"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><strong>One-hot \u7f16\u7801<\/strong>\u7528\u4e8e\u5c06\u5206\u7c7b\u53d8\u91cf\u8f6c\u6362\u4e3a<a href=\"https:\/\/statorials.org\/cn\/\u7edf\u8ba1\u5b66\u4ee5\u7b80\u5355\u76f4\u63a5\u7684\u65b9\u5f0f\u89e3\u91ca\u6982\u5ff5\uff0c\u6211\u4eec\u4f7f\u5b66\u4e60\u7edf\u8ba1\u53d8\u5f97\u66f4\u5bb9\u6613\/\" target=\"_blank\" rel=\"noopener\">\u673a\u5668\u5b66\u4e60\u7b97\u6cd5<\/a>\u53ef\u4ee5\u8f7b\u677e\u4f7f\u7528\u7684\u683c\u5f0f\u3002<\/span><\/p>\n<p> <span style=\"color: #000000;\">one-hot \u7f16\u7801\u7684\u57fa\u672c\u601d\u60f3\u662f\u521b\u5efa\u65b0\u53d8\u91cf\uff0c\u7528\u503c 0 \u548c 1 \u6765\u8868\u793a\u539f\u59cb\u5206\u7c7b\u503c\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4f8b\u5982\uff0c\u4e0b\u56fe\u663e\u793a\u4e86\u6211\u4eec\u5982\u4f55\u8fdb\u884c\u5355\u70ed\u7f16\u7801\uff0c\u5c06\u5305\u542b\u56e2\u961f\u540d\u79f0\u7684\u5206\u7c7b\u53d8\u91cf\u8f6c\u6362\u4e3a\u4ec5\u5305\u542b 0 \u548c 1 \u503c\u7684\u65b0\u53d8\u91cf\uff1a<\/span> <\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-20468 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/unhot1.png\" alt=\"\" width=\"592\" height=\"275\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u5206\u6b65\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u5728 Python \u4e2d\u5bf9\u8fd9\u4e00\u7cbe\u786e\u6570\u636e\u96c6\u6267\u884c one-hot \u7f16\u7801\u3002<\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u7b2c 1 \u6b65\uff1a\u521b\u5efa\u6570\u636e<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u9996\u5148\uff0c\u6211\u4eec\u521b\u5efa\u4ee5\u4e0b pandas DataFrame\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #107d3f;\">import<\/span> pandas <span style=\"color: #107d3f;\">as<\/span> pd\n\n<span style=\"color: #008080;\">#createDataFrame\n<\/span>df = pd. <span style=\"color: #3366ff;\">DataFrame<\/span> ({' <span style=\"color: #ff0000;\">team<\/span> ': ['A', 'A', 'B', 'B', 'B', 'B', 'C', 'C'],\n                   ' <span style=\"color: #ff0000;\">points<\/span> ': [25, 12, 15, 14, 19, 23, 25, 29]})\n\n<span style=\"color: #008080;\">#view DataFrame\n<\/span><span style=\"color: #008000;\">print<\/span> (df)\n\n  team points\n0 to 25\n1 to 12\n2 B 15\n3 B 14\n4 B 19\n5 B 23\n6 C 25\n7 C 29<\/strong><\/pre>\n<h3><span style=\"color: #000000;\"><strong>\u7b2c2\u6b65\uff1a\u6267\u884cone-hot\u7f16\u7801<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u63a5\u4e0b\u6765\uff0c\u8ba9\u6211\u4eec\u4ece<strong>sklearn<\/strong>\u5e93\u5bfc\u5165<strong>OneHotEncoder()<\/strong>\u51fd\u6570\uff0c\u5e76\u4f7f\u7528\u5b83\u5bf9 pandas DataFrame \u4e2d\u7684\u201cteam\u201d\u53d8\u91cf\u6267\u884c\u70ed\u7f16\u7801\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">from<\/span> sklearn. <span style=\"color: #3366ff;\">preprocessing<\/span> <span style=\"color: #008000;\">import<\/span> OneHotEncoder\n\n<span style=\"color: #008080;\">#creating instance of one-hot-encoder\n<\/span>encoder = OneHotEncoder(handle_unknown=' <span style=\"color: #ff0000;\">ignore<\/span> ')\n\n<span style=\"color: #008080;\">#perform one-hot encoding on 'team' column \n<\/span>encoder_df = pd. <span style=\"color: #3366ff;\">DataFrame<\/span> ( <span style=\"color: #3366ff;\">encoder.fit_transform<\/span> (df[[' <span style=\"color: #ff0000;\">team<\/span> ']]). <span style=\"color: #3366ff;\">toarray<\/span> ())\n\n<span style=\"color: #008080;\">#merge one-hot encoded columns back with original DataFrame\n<\/span>final_df = df. <span style=\"color: #3366ff;\">join<\/span> (encoder_df)\n\n<span style=\"color: #008080;\">#view final df\n<\/span><span style=\"color: #008000;\">print<\/span> (final_df)\n\n  team points 0 1 2\n0 to 25 1.0 0.0 0.0\n1 to 12 1.0 0.0 0.0\n2 B 15 0.0 1.0 0.0\n3 B 14 0.0 1.0 0.0\n4 B 19 0.0 1.0 0.0\n5 B 23 0.0 1.0 0.0\n6 C 25 0.0 0.0 1.0\n7 C 29 0.0 0.0 1.0\n<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u8bf7\u6ce8\u610f\uff0c\u7531\u4e8e\u539f\u59cb\u201cteam\u201d\u5217\u5305\u542b\u4e09\u4e2a\u552f\u4e00\u503c\uff0c\u56e0\u6b64\u5df2\u5c06\u4e09\u4e2a\u65b0\u5217\u6dfb\u52a0\u5230 DataFrame \u4e2d\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u6ce8\u610f<\/strong>\uff1a\u60a8\u53ef\u4ee5<a href=\"https:\/\/scikit-learn.org\/stable\/modules\/generated\/sklearn.preprocessing.OneHotEncoder.html\" target=\"_blank\" rel=\"noopener\">\u5728\u6b64\u5904<\/a>\u627e\u5230<strong>OneHotEncoder()<\/strong>\u51fd\u6570\u7684\u5b8c\u6574\u6587\u6863\u3002<\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u6b65\u9aa4 3\uff1a\u5220\u9664\u539f\u59cb\u5206\u7c7b\u53d8\u91cf<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u6700\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u4ece DataFrame \u4e2d\u5220\u9664\u539f\u59cb\u7684\u201cteam\u201d\u53d8\u91cf\uff0c\u56e0\u4e3a\u6211\u4eec\u4e0d\u518d\u9700\u8981\u5b83\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#drop 'team' column\n<\/span>final_df. <span style=\"color: #3366ff;\">drop<\/span> (' <span style=\"color: #ff0000;\">team<\/span> ', axis= <span style=\"color: #008000;\">1<\/span> , inplace= <span style=\"color: #008000;\">True<\/span> )\n\n<span style=\"color: #008080;\">#view final df\n<\/span><span style=\"color: #008000;\">print<\/span> (final_df)\n\n   points 0 1 2\n0 25 1.0 0.0 0.0\n1 12 1.0 0.0 0.0\n2 15 0.0 1.0 0.0\n3 14 0.0 1.0 0.0\n4 19 0.0 1.0 0.0\n5 23 0.0 1.0 0.0\n6 25 0.0 0.0 1.0\n7 29 0.0 0.0 1.0\n<\/strong><\/pre>\n<p><span style=\"color: #000000;\"><strong>\u76f8\u5173\uff1a<\/strong><\/span><a href=\"https:\/\/statorials.org\/cn\/\u5220\u9664\u5217\u718a\u732b\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u5220\u9664 Pandas \u4e2d\u7684\u5217\uff084 \u79cd\u65b9\u6cd5\uff09<\/a><\/p>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u8fd8\u53ef\u4ee5\u91cd\u547d\u540d\u6700\u7ec8 DataFrame \u7684\u5217\uff0c\u4ee5\u4f7f\u5b83\u4eec\u66f4\u6613\u4e8e\u9605\u8bfb\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#rename columns\n<\/span>final_df. <span style=\"color: #3366ff;\">columns<\/span> = ['points', 'teamA', 'teamB', 'teamC']\n\n<span style=\"color: #008080;\">#view final df<\/span>\n<span style=\"color: #008000;\">print<\/span> (final_df)\n\n   points teamA teamB teamC\n0 25 1.0 0.0 0.0\n1 12 1.0 0.0 0.0\n2 15 0.0 1.0 0.0\n3 14 0.0 1.0 0.0\n4 19 0.0 1.0 0.0\n5 23 0.0 1.0 0.0\n6 25 0.0 0.0 1.0\n7 29 0.0 0.0 1.0\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">One-hot \u7f16\u7801\u5df2\u5b8c\u6210\uff0c\u6211\u4eec\u73b0\u5728\u53ef\u4ee5\u5c06\u6b64 pandas DataFrame \u63d2\u5165\u5230\u6211\u4eec\u60f3\u8981\u7684\u4efb\u4f55\u673a\u5668\u5b66\u4e60\u7b97\u6cd5\u4e2d\u3002<\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u5176\u4ed6\u8d44\u6e90<\/strong><\/span><\/h3>\n<p><a href=\"https:\/\/statorials.org\/cn\/python\u4e2d\u7684\u4e2d\u7b49\u5927\u5c0f\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u5728 Python \u4e2d\u8ba1\u7b97\u622a\u5c3e\u5e73\u5747\u503c<\/a><br \/><a href=\"https:\/\/statorials.org\/cn\/\u7ebf\u6027\u56de\u5f52-python\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u5728 Python \u4e2d\u6267\u884c\u7ebf\u6027\u56de\u5f52<\/a><br \/><a href=\"https:\/\/statorials.org\/cn\/\u903b\u8f91\u56de\u5f52-python\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u5728 Python \u4e2d\u6267\u884c\u903b\u8f91\u56de\u5f52<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>One-hot \u7f16\u7801\u7528\u4e8e\u5c06\u5206\u7c7b\u53d8\u91cf\u8f6c\u6362\u4e3a\u673a\u5668\u5b66\u4e60\u7b97\u6cd5\u53ef\u4ee5\u8f7b\u677e\u4f7f\u7528\u7684\u683c\u5f0f\u3002 one-hot \u7f16\u7801\u7684\u57fa\u672c\u601d\u60f3\u662f\u521b\u5efa [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-2237","post","type-post","status-publish","format-standard","hentry","category-11"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5982\u4f55\u5728 Python \u4e2d\u6267\u884c One-Hot \u7f16\u7801 - Statorials<\/title>\n<meta name=\"description\" content=\"\u672c\u6559\u7a0b\u901a\u8fc7\u4e00\u4e2a\u5206\u6b65\u793a\u4f8b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 Python \u4e2d\u8fdb\u884c one-hot \u7f16\u7801\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/statorials.org\/cn\/python-\u4e2d\u7684\u70ed\u7f16\u7801\/\" \/>\n<meta property=\"og:locale\" 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