{"id":8970,"date":"2024-12-19T21:59:57","date_gmt":"2024-12-19T12:59:57","guid":{"rendered":"https:\/\/www.pythonic-exam.com\/?p=8970"},"modified":"2024-12-19T21:59:58","modified_gmt":"2024-12-19T12:59:58","slug":"%e7%ac%ac16%e5%9b%9e%e3%80%8cscikit-learn%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%ef%bc%882%ef%bc%89%e3%82%ab%e3%83%86%e3%82%b4%e3%83%aa%e5%a4%89%e6%95%b0%e3%81%ae%e3%82%a8%e3%83%b3%e3%82%b3%e3%83%bc","status":"publish","type":"post","link":"https:\/\/www.pythonic-exam.com\/archives\/8970","title":{"rendered":"\u7b2c16\u56de\u300cscikit-learn\u306e\u4f7f\u3044\u65b9\uff082\uff09\u30ab\u30c6\u30b4\u30ea\u5909\u6570\u306e\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3068\u7279\u5fb4\u91cf\u306e\u6b63\u898f\u5316\u300d"},"content":{"rendered":"\n<p>\u3053\u3093\u306b\u3061\u306f\u3001\u5c0f\u6fa4\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4eca\u56de\u3082\u5f15\u304d\u7d9a\u304d\u3001\u300cscikit-learn\u300d\u306b\u304a\u3051\u308b\u524d\u51e6\u7406\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002\u4eca\u56de\u306f\u3001\u6a5f\u68b0\u5b66\u7fd2\u30e2\u30c7\u30eb\u306e\u6027\u80fd\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u308b2\u3064\u306e\u524d\u51e6\u7406\u3068\u3057\u3066\u3001\u300c\u30ab\u30c6\u30b4\u30ea\u5909\u6570\u306e\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u300d\u3068\u300c\u7279\u5fb4\u91cf\u306e\u6b63\u898f\u5316\u300d\u3092\u53d6\u308a\u4e0a\u3052\u3001\u305d\u308c\u305e\u308c\u306e\u5b9f\u88c5\u65b9\u6cd5\u3068\u6d3b\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u306a\u304a\u3001\u6559\u79d1\u66f8\u300e<a href=\"https:\/\/www.shoeisha.co.jp\/book\/detail\/9784798176611\">Python\u306b\u3088\u308b\u65b0\u3057\u3044\u30c7\u30fc\u30bf\u5206\u6790\u306e\u6559\u79d1\u66f8\uff08\u7b2c2\u7248\uff09<\/a>\u300f\u3067\u306f\u30014.4.1\u7ae0\u300c\u524d\u51e6\u7406\u300d\uff08217\u301c225\u30da\u30fc\u30b8\uff09\u306e\u7b87\u6240\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><a><\/a><strong>\u30ab\u30c6\u30b4\u30ea\u5909\u6570\u306e\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0<\/strong><strong><\/strong><\/h2>\n\n\n\n<p>\u6a5f\u68b0\u5b66\u7fd2\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u6570\u5024\u30c7\u30fc\u30bf\u3092\u524d\u63d0\u3068\u3057\u3066\u52d5\u4f5c\u3059\u308b\u305f\u3081\u3001\u6587\u5b57\u5217\u306a\u3069\u306e\u30ab\u30c6\u30b4\u30ea\u5909\u6570\u306f\u6570\u5024\u30c7\u30fc\u30bf\u306b\u5909\u63db\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30ab\u30c6\u30b4\u30ea\u5909\u6570\u3068\u306f\u3001\u6027\u5225\u3001\u8840\u6db2\u578b\u3001\u8077\u696d\u306a\u3069\u3001\u9650\u3089\u308c\u305f\u7a2e\u985e\u306e\u5024\u3092\u3068\u308b\u5909\u6570\u306e\u3053\u3068\u3092\u6307\u3057\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u30ab\u30c6\u30b4\u30ea\u5909\u6570\u3092\u6a5f\u68b0\u5b66\u7fd2\u3067\u6271\u3048\u308b\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u3001\u6570\u5024\u30c7\u30fc\u30bf\u3078\u306e\u5909\u63db\u30d7\u30ed\u30bb\u30b9\u304c\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u5909\u63db\u30d7\u30ed\u30bb\u30b9\u3092\u300c\u30ab\u30c6\u30b4\u30ea\u5909\u6570\u306e\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u300d\u3068\u547c\u3073\u3001scikit-learn\u3067\u306f\u4ee5\u4e0b\u306e\u624b\u6cd5\u3092\u5229\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a><strong>1. \u30e9\u30d9\u30eb\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0<\/strong><\/h3>\n\n\n\n<p>LabelEncoder\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30ab\u30c6\u30b4\u30ea\u5909\u6570\u3092\u6574\u6570\u5024\u306b\u5909\u63db\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>from sklearn.preprocessing import LabelEncoder<br><br># \u30b5\u30f3\u30d7\u30eb\u30c7\u30fc\u30bf<br>categories = [&#8216;dog&#8217;, &#8216;cat&#8217;, &#8216;bird&#8217;, &#8216;dog&#8217;, &#8216;bird&#8217;]<br><br># LabelEncoder\u3092\u9069\u7528<br>encoder = LabelEncoder()<br>encoded_labels = encoder.fit_transform(categories)<br><br>print(f&#8221;\u5909\u63db\u5f8c: {encoded_labels}&#8221;)<br>print(f&#8221;\u30af\u30e9\u30b9: {encoder.classes_}&#8221;)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9577\u6240\uff1a\u5b9f\u88c5\u304c\u30b7\u30f3\u30d7\u30eb\u3067\u76f4\u611f\u7684\u3002<\/li>\n\n\n\n<li>\u77ed\u6240\uff1a\u5909\u63db\u5f8c\u306e\u6570\u5024\u306f\u9023\u7d9a\u7684\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u305f\u3081\u3001\u6570\u5024\u9593\u306b\u610f\u5473\u306e\u306a\u3044\u5927\u5c0f\u95a2\u4fc2\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a><strong>2. One-Hot Encoding<\/strong><\/h3>\n\n\n\n<p>OneHotEncoder\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30ab\u30c6\u30b4\u30ea\u5909\u6570\u3092\u30d0\u30a4\u30ca\u30ea\u5f62\u5f0f\u306e\u5217\u306b\u5909\u63db\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u6570\u5024\u9593\u306e\u610f\u5473\u306e\u306a\u3044\u5927\u5c0f\u95a2\u4fc2\u3092\u907f\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>from sklearn.preprocessing import OneHotEncoder<br>import numpy as np<br><br># \u30b5\u30f3\u30d7\u30eb\u30c7\u30fc\u30bf<br>categories = np.array([&#8216;dog&#8217;, &#8216;cat&#8217;, &#8216;bird&#8217;, &#8216;dog&#8217;, &#8216;bird&#8217;]).reshape(-1, 1)<br><br># OneHotEncoder\u3092\u9069\u7528<br>encoder = OneHotEncoder(sparse=False)<br>encoded_onehot = encoder.fit_transform(categories)<br><br>print(f&#8221;\u5909\u63db\u5f8c:\\\\n{encoded_onehot}&#8221;)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9577\u6240\uff1a\u30ab\u30c6\u30b4\u30ea\u9593\u306e\u5927\u5c0f\u95a2\u4fc2\u3092\u56de\u907f\u3067\u304d\u308b\u3002<\/li>\n\n\n\n<li>\u77ed\u6240\uff1a\u30ab\u30e9\u30e0\u6570\u304c\u5897\u3048\u308b\u305f\u3081\u3001\u9ad8\u6b21\u5143\u30c7\u30fc\u30bf\u3067\u306f\u30e1\u30e2\u30ea\u52b9\u7387\u304c\u4f4e\u4e0b\u3059\u308b\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><a><\/a><strong>&nbsp;<\/strong><\/h2>\n\n\n\n<h2 class=\"wp-block-heading\"><a><\/a><strong>\u7279\u5fb4\u91cf\u306e\u6b63\u898f\u5316<\/strong><strong><\/strong><\/h2>\n\n\n\n<p>\u6b63\u898f\u5316\u306f\u3001\u30c7\u30fc\u30bf\u306e\u30b9\u30b1\u30fc\u30eb\u3092\u4e00\u5b9a\u306b\u63c3\u3048\u308b\u305f\u3081\u306e\u51e6\u7406\u3067\u3059\u3002\u30e2\u30c7\u30eb\u304c\u7279\u5b9a\u306e\u7279\u5fb4\u91cf\u306b\u904e\u5ea6\u306b\u4f9d\u5b58\u3059\u308b\u306e\u3092\u9632\u304e\u3001\u52b9\u7387\u7684\u306a\u5b66\u7fd2\u3092\u4fc3\u9032\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306e2\u3064\u304c\u4e00\u822c\u7684\u306a\u624b\u6cd5\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a><strong>1. <\/strong><strong>\u5206\u6563\u6b63\u898f\u5316<\/strong><strong>\uff08<\/strong><strong>\u6a19\u6e96\u5316<\/strong><strong> \/ Standardization\uff09<\/strong><strong><\/strong><\/h3>\n\n\n\n<p>\u5206\u6563\u6b63\u898f\u5316\u306f\u3001\u30c7\u30fc\u30bf\u3092\u300c\u5e73\u57470\u3001\u5206\u65631\u300d\u306e\u30b9\u30b1\u30fc\u30eb\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002\u7279\u5fb4\u91cf\u306e\u5024\u304c\u5e73\u5747\u3092\u4e2d\u5fc3\u306b\u5bfe\u79f0\u5206\u5e03\u3059\u308b\u5834\u5408\u306b\u9069\u3057\u3066\u304a\u308a\u3001\u7dda\u5f62\u56de\u5e30\u3001SVM\u3001\u30ed\u30b8\u30b9\u30c6\u30a3\u30c3\u30af\u56de\u5e30\u306a\u3069\u306e\u591a\u304f\u306e\u6a5f\u68b0\u5b66\u7fd2\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3067\u6709\u52b9\u3067\u3059\u3002scikit-learn\u3067\u306fStandardScaler\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u3053\u306e\u5909\u63db\u3092\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>from sklearn.preprocessing import StandardScaler<br><br># \u30b5\u30f3\u30d7\u30eb\u30c7\u30fc\u30bf<br>data = [[10, 200], [20, 300], [30, 400]]<br><br># StandardScaler\u3092\u9069\u7528<br>scaler = StandardScaler()<br>standardized_data = scaler.fit_transform(data)<br><br>print(f&#8221;\u6a19\u6e96\u5316\u5f8c:\\\\n{standardized_data}&#8221;)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9577\u6240\uff1a\u5916\u308c\u5024\u306b\u3042\u308b\u7a0b\u5ea6\u306e\u8010\u6027\u304c\u3042\u308b\u3002\u6b63\u898f\u5206\u5e03\u306b\u8fd1\u3044\u30c7\u30fc\u30bf\u3067\u7279\u306b\u6709\u52b9\u3002<\/li>\n\n\n\n<li>\u77ed\u6240\uff1a\u30c7\u30fc\u30bf\u306e\u7bc4\u56f2\u304c\u63c3\u308f\u306a\u3044\u305f\u3081\u3001\u975e\u8ddd\u96e2\u30d9\u30fc\u30b9\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306b\u306f\u9069\u3055\u306a\u3044\u5834\u5408\u304c\u3042\u308b\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a><strong>2. <\/strong><strong>\u6700\u5927\u6700\u5c0f\u6b63\u898f\u5316<\/strong><strong>\uff08Min-Max Normalization\uff09<\/strong><strong><\/strong><\/h3>\n\n\n\n<p>\u6700\u5927\u6700\u5c0f\u6b63\u898f\u5316\u306f\u3001\u30c7\u30fc\u30bf\u3092\u6307\u5b9a\u3057\u305f\u7bc4\u56f2\uff08\u901a\u5e38\u306f[0, 1]\uff09\u306b\u30b9\u30b1\u30fc\u30ea\u30f3\u30b0\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002\u5024\u306e\u7bc4\u56f2\u304c\u63c3\u3046\u3053\u3068\u3067\u3001\u8ddd\u96e2\u8a08\u7b97\u3084\u52fe\u914d\u964d\u4e0b\u6cd5\u3092\u4f7f\u7528\u3059\u308b\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\uff08\u4f8b: k-NN\u3001\u30cb\u30e5\u30fc\u30e9\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\uff09\u306b\u6709\u52b9\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>from sklearn.preprocessing import MinMaxScaler<br><br># \u30b5\u30f3\u30d7\u30eb\u30c7\u30fc\u30bf<br>data = [[10, 200], [20, 300], [30, 400]]<br><br># \u6700\u5927\u6700\u5c0f\u6b63\u898f\u5316<br>scaler = MinMaxScaler()<br>normalized_data = scaler.fit_transform(data)<br><br>print(&#8220;\u6700\u5927\u6700\u5c0f\u6b63\u898f\u5316\u5f8c\u306e\u30c7\u30fc\u30bf:&#8221;)<br>print(normalized_data)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9577\u6240\uff1a\u30c7\u30fc\u30bf\u304c\u4e00\u5b9a\u306e\u7bc4\u56f2\u5185\u306b\u53ce\u307e\u308b\u305f\u3081\u3001\u6570\u5024\u30b9\u30b1\u30fc\u30eb\u306e\u5dee\u7570\u3092\u89e3\u6d88\u3067\u304d\u308b\u3002\u975e\u5e38\u306b\u7c21\u5358\u3067\u76f4\u611f\u7684\u3002<\/li>\n\n\n\n<li>\u77ed\u6240\uff1a\u5916\u308c\u5024\u306b\u5f31\u304f\u3001\u6975\u7aef\u306a\u5024\u304c\u5168\u4f53\u306e\u30b9\u30b1\u30fc\u30eb\u3092\u6b6a\u3081\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a><strong>3. \u5206\u6563\u6b63\u898f\u5316\u3068\u6700\u5927\u6700\u5c0f\u6b63\u898f\u5316\u306e\u6bd4\u8f03<\/strong><strong><\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>&nbsp;<\/td><td><strong>\u5206\u6563\u6b63\u898f\u5316<\/strong><\/td><td><strong>\u6700\u5927\u6700\u5c0f\u6b63\u898f\u5316<\/strong><\/td><\/tr><tr><td><strong>\u5909\u63db\u5f8c\u306e\u5206\u5e03<\/strong><\/td><td>\u5e73\u57470\u3001\u5206\u65631\u306b\u30b9\u30b1\u30fc\u30ea\u30f3\u30b0<\/td><td>\u7bc4\u56f2[0, 1]\u306b\u30b9\u30b1\u30fc\u30ea\u30f3\u30b0<\/td><\/tr><tr><td><strong>\u5916\u308c\u5024\u3078\u306e\u5f71\u97ff<\/strong><\/td><td>\u6bd4\u8f03\u7684\u5f71\u97ff\u3092\u53d7\u3051\u306b\u304f\u3044<\/td><td>\u5916\u308c\u5024\u306b\u5f31\u3044<\/td><\/tr><tr><td><strong>\u9069\u7528\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0<\/strong><\/td><td>SVM\u3001\u7dda\u5f62\u56de\u5e30\u3001\u30ed\u30b8\u30b9\u30c6\u30a3\u30c3\u30af\u56de\u5e30<\/td><td>k-NN\u3001\u30cb\u30e5\u30fc\u30e9\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5206\u6563\u6b63\u898f\u5316\u3092\u9078\u3076\u5834\u5408<ul><li>\u7279\u5fb4\u91cf\u306e\u5024\u304c\u6b63\u898f\u5206\u5e03\u306b\u8fd1\u3044\u5834\u5408\u3002<\/li><\/ul>\n<ul class=\"wp-block-list\">\n<li>\u30b9\u30b1\u30fc\u30eb\u4f9d\u5b58\u306e\u30e2\u30c7\u30eb\uff08\u4f8b: SVM\u3084\u7dda\u5f62\u30e2\u30c7\u30eb\uff09\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u6700\u5927\u6700\u5c0f\u6b63\u898f\u5316\u3092\u9078\u3076\u5834\u5408<ul><li>\u30c7\u30fc\u30bf\u306e\u5206\u5e03\u306b\u95a2\u4fc2\u306a\u304f\u3001\u7bc4\u56f2\u3092\u7d71\u4e00\u3057\u305f\u3044\u5834\u5408\u3002<\/li><\/ul>\n<ul class=\"wp-block-list\">\n<li>\u8ddd\u96e2\u30d9\u30fc\u30b9\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3084\u30cb\u30e5\u30fc\u30e9\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><a><\/a><strong>&nbsp;<\/strong><\/h2>\n\n\n\n<h2 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