{"id":47112,"date":"2026-08-14T14:02:18","date_gmt":"2026-08-14T05:02:18","guid":{"rendered":"https:\/\/www.ripla.co.jp\/blog\/?p=47112"},"modified":"2026-08-31T19:38:49","modified_gmt":"2026-08-31T10:38:49","slug":"gini-impurity","status":"publish","type":"post","link":"https:\/\/www.ripla.co.jp\/blog\/system\/gini-impurity\/","title":{"rendered":"\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3068\u306f\uff1f\u6c7a\u5b9a\u6728\u306e\u5206\u5272\u57fa\u6e96\u30fb\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u3068\u306e\u9055\u3044\u30fb\u7279\u5fb4\u91cf\u91cd\u8981\u5ea6\u3092\u89e3\u8aac"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3068\u306f\u3001\u6c7a\u5b9a\u6728\u306e\u30ce\u30fc\u30c9\u306b\u7570\u306a\u308b\u30af\u30e9\u30b9\u304c\u3069\u306e\u7a0b\u5ea6\u6df7\u5728\u3057\u3066\u3044\u308b\u304b\u3092\u8868\u3059\u6307\u6a19\u3067\u3059\u3002\u5206\u985e\u6728\u306f\u3001\u7279\u5fb4\u91cf\u306e\u6761\u4ef6\u3067\u30c7\u30fc\u30bf\u3092\u5206\u5272\u3057\u3001\u5206\u5272\u5f8c\u306e\u30ce\u30fc\u30c9\u304c\u3067\u304d\u308b\u3060\u3051\u4e00\u3064\u306e\u30af\u30e9\u30b9\u306b\u305d\u308d\u3046\u3088\u3046\u306b\u5b66\u7fd2\u3057\u307e\u3059\u3002\u305d\u306e\u300c\u305d\u308d\u3044\u5177\u5408\u300d\u3092\u8a55\u4fa1\u3059\u308b\u4ee3\u8868\u7684\u306a\u57fa\u6e96\u304c\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3067\u3001\u5024\u304c\u5c0f\u3055\u3044\u307b\u3069\u30ce\u30fc\u30c9\u5185\u306e\u5206\u985e\u304c\u7d14\u7c8b\u3067\u3042\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b8\u30cb\u4e0d\u7d14\u5ea6\u306f\u3001\u6c7a\u5b9a\u6728\u3084\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u306e\u5206\u5272\u57fa\u6e96\u3092\u7406\u89e3\u3059\u308b\u3046\u3048\u3067\u91cd\u8981\u3067\u3059\u304c\u3001\u5024\u304c\u5c0f\u3055\u3044\u7279\u5fb4\u91cf\u304c\u5e38\u306b\u56e0\u679c\u7684\u306b\u91cd\u8981\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002\u30ab\u30c6\u30b4\u30ea\u306e\u6570\u3084\u30af\u30e9\u30b9\u306e\u504f\u308a\u3001\u6728\u306e\u6df1\u3055\u3001\u5206\u5272\u5f8c\u306e\u30b5\u30f3\u30d7\u30eb\u6570\u306b\u5f71\u97ff\u3055\u308c\u307e\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f\u3001\u30b8\u30cb\u4e0d\u7d14\u5ea6\u306e\u5f0f\u3068\u8a08\u7b97\u4f8b\u3001\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u3068\u306e\u9055\u3044\u3001\u6c7a\u5b9a\u6728\u3067\u306e\u5206\u5272\u9078\u629e\u3001\u7279\u5fb4\u91cf\u91cd\u8981\u5ea6\u3092\u8aad\u3080\u3068\u304d\u306e\u6ce8\u610f\u70b9\u3092\u6574\u7406\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"gini-overview\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3068\u306f\uff1f\u30ce\u30fc\u30c9\u5185\u306e\u30af\u30e9\u30b9\u6df7\u5728\u3092\u6e2c\u308b\u6307\u6a19<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b8\u30cb\u4e0d\u7d14\u5ea6\uff08Gini impurity\uff09\u306f\u3001\u3042\u308b\u30ce\u30fc\u30c9\u304b\u3089\u30e9\u30f3\u30c0\u30e0\u306b1\u4ef6\u3092\u9078\u3073\u3001\u305d\u306e\u30ce\u30fc\u30c9\u5185\u306e\u30af\u30e9\u30b9\u5272\u5408\u306b\u5f93\u3063\u3066\u30e9\u30f3\u30c0\u30e0\u306b\u30e9\u30d9\u30eb\u3092\u4ed8\u3051\u305f\u3068\u304d\u3001\u8aa4\u5206\u985e\u3059\u308b\u78ba\u7387\u3068\u3057\u3066\u8aac\u660e\u3067\u304d\u307e\u3059\u3002\u4e8c\u30af\u30e9\u30b9\u5206\u985e\u3067\u4e00\u65b9\u306e\u30af\u30e9\u30b9\u304c100\uff05\u306a\u3089\u8aa4\u308a\u306f\u8d77\u304d\u306a\u3044\u305f\u3081\u3001\u30b8\u30cb\u4e0d\u7d14\u5ea6\u306f0\u3067\u3059\u3002\u30af\u30e9\u30b9\u304c50\uff05\u305a\u3064\u6df7\u3056\u308b\u3068\u3001\u30e9\u30f3\u30c0\u30e0\u306a\u30e9\u30d9\u30eb\u4ed8\u3051\u306e\u8aa4\u308a\u304c\u6700\u5927\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ce\u30fc\u30c9\u5185\u306e\u30af\u30e9\u30b9 <code>k<\/code> \u306e\u5272\u5408\u3092 <code>p_k<\/code> \u3068\u3059\u308b\u3068\u3001\u30b8\u30cb\u4e0d\u7d14\u5ea6\u306f\u6b21\u306e\u5f0f\u3067\u8a08\u7b97\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Gini = 1 - \u03a3 p_k\u00b2<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e8c\u30af\u30e9\u30b9\u3067\u5272\u5408\u304c0.7\u30680.3\u306a\u3089\u3001<code>1-(0.7\u00b2+0.3\u00b2)=0.42<\/code> \u3067\u3059\u30020.5\u30680.5\u306a\u30890.50\u30011.0\u30680.0\u306a\u30890\u306b\u306a\u308a\u307e\u3059\u3002\u591a\u30af\u30e9\u30b9\u3067\u306f\u30af\u30e9\u30b9\u6570\u304c\u5897\u3048\u308b\u307b\u3069\u6700\u5927\u5024\u304c\u5909\u308f\u308b\u305f\u3081\u3001\u7570\u306a\u308b\u30ab\u30c6\u30b4\u30ea\u6570\u306e\u554f\u984c\u3067\u30b8\u30cb\u4e0d\u7d14\u5ea6\u306e\u7d76\u5bfe\u5024\u3092\u5358\u7d14\u6bd4\u8f03\u3057\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 id=\"gini-split\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u6c7a\u5b9a\u6728\u3067\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3092\u4f7f\u3046\u4ed5\u7d44\u307f\uff5c\u5206\u5272\u5f8c\u306e\u52a0\u91cd\u5e73\u5747\u3092\u5c0f\u3055\u304f\u3059\u308b<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6c7a\u5b9a\u6728\u306f\u3001\u7279\u5fb4\u91cf\u3068\u3057\u304d\u3044\u5024\u306e\u5019\u88dc\u3092\u9806\u306b\u8a66\u3057\u3001\u5206\u5272\u5f8c\u306e\u5b50\u30ce\u30fc\u30c9\u306e\u4e0d\u7d14\u5ea6\u304c\u5c0f\u3055\u304f\u306a\u308b\u6761\u4ef6\u3092\u9078\u3073\u307e\u3059\u3002\u89aa\u30ce\u30fc\u30c9\u306e\u30b5\u30f3\u30d7\u30eb\u6570\u3092 <code>N<\/code>\u3001\u5de6\u3068\u53f3\u306e\u5b50\u30ce\u30fc\u30c9\u306e\u30b5\u30f3\u30d7\u30eb\u6570\u3092 <code>N_L<\/code>\u3001<code>N_R<\/code>\u3001\u305d\u308c\u305e\u308c\u306e\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3092 <code>G_L<\/code>\u3001<code>G_R<\/code> \u3068\u3059\u308b\u3068\u3001\u5206\u5272\u5f8c\u306e\u8a55\u4fa1\u5024\u306f\u6b21\u306e\u52a0\u91cd\u5e73\u5747\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>G_split = (N_L \/ N) \u00d7 G_L + (N_R \/ N) \u00d7 G_R<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b50\u30ce\u30fc\u30c9\u306e\u4e00\u65b9\u304c\u6975\u7aef\u306b\u5c0f\u3055\u3044\u5834\u5408\u3001\u305d\u306e\u30ce\u30fc\u30c9\u306e\u4e0d\u7d14\u5ea6\u304c\u4f4e\u304f\u3066\u3082\u5168\u4f53\u3078\u306e\u5f71\u97ff\u306f\u5c0f\u3055\u304f\u306a\u308a\u307e\u3059\u3002\u53cd\u5bfe\u306b\u5927\u304d\u306a\u5b50\u30ce\u30fc\u30c9\u306e\u4e0d\u7d14\u5ea6\u304c\u9ad8\u3044\u3068\u3001\u5206\u5272\u5f8c\u306e\u5024\u306f\u3042\u307e\u308a\u6539\u5584\u3057\u307e\u305b\u3093\u3002\u5b66\u7fd2\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u5019\u88dc\u306e\u4e2d\u3067\u3053\u306e\u5024\u3092\u6700\u5c0f\u306b\u3059\u308b\u5206\u5272\u3092\u9078\u3073\u3001\u89aa\u30ce\u30fc\u30c9\u3068\u306e\u5dee\u3092\u4e0d\u7d14\u5ea6\u6e1b\u5c11\u3084\u60c5\u5831\u5229\u5f97\u3068\u3057\u3066\u6271\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"gini-example\" class=\"wp-block-heading\"><strong>\u7c21\u5358\u306a\u5206\u5272\u4f8b<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u89aa\u30ce\u30fc\u30c9\u306b\u30af\u30e9\u30b9A\u304c6\u4ef6\u3001\u30af\u30e9\u30b9B\u304c4\u4ef6\u3042\u308b\u3068\u3057\u307e\u3059\u3002\u89aa\u306e\u30b8\u30cb\u4e0d\u7d14\u5ea6\u306f <code>1-(0.6\u00b2+0.4\u00b2)=0.48<\/code> \u3067\u3059\u3002\u3042\u308b\u5206\u5272\u3067\u5de6\u30ce\u30fc\u30c9\u304cA5\u4ef6\u30fbB0\u4ef6\u3001\u53f3\u30ce\u30fc\u30c9\u304cA1\u4ef6\u30fbB4\u4ef6\u306b\u306a\u3063\u305f\u5834\u5408\u3001\u5de6\u306f0\u3001\u53f3\u306f <code>1-(0.2\u00b2+0.8\u00b2)=0.32<\/code> \u3067\u3059\u3002\u5b50\u30ce\u30fc\u30c9\u306e\u52a0\u91cd\u5e73\u5747\u306f <code>0.5\u00d70+0.5\u00d70.32=0.16<\/code> \u3068\u306a\u308a\u3001\u89aa\u3088\u308a\u6df7\u5728\u304c\u6e1b\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"gini-entropy\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3068\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u306e\u9055\u3044\uff5c\u5206\u985e\u6728\u306e\u5206\u5272\u57fa\u6e96\u3092\u6bd4\u8f03\u3059\u308b<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u3082\u30ce\u30fc\u30c9\u5185\u306e\u30af\u30e9\u30b9\u306e\u6df7\u3056\u308a\u5177\u5408\u3092\u6e2c\u308b\u6307\u6a19\u3067\u3001\u60c5\u5831\u7406\u8ad6\u306b\u57fa\u3065\u304d\u307e\u3059\u3002\u30af\u30e9\u30b9\u5272\u5408\u3092 <code>p_k<\/code> \u3068\u3059\u308b\u3068\u3001\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u306f <code>-\u03a3 p_k log(p_k)<\/code> \u3067\u3059\u3002\u4e21\u65b9\u3068\u3082\u4e00\u3064\u306e\u30af\u30e9\u30b9\u306b\u96c6\u4e2d\u3059\u308b\u30680\u306b\u306a\u308a\u3001\u30af\u30e9\u30b9\u304c\u5747\u7b49\u306b\u6df7\u3056\u308b\u307b\u3069\u5927\u304d\u304f\u306a\u308a\u307e\u3059\u3002\u6c7a\u5b9a\u6728\u3067\u306f\u3001\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3092\u4f7f\u3046\u5b9f\u88c5\u3068\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u3092\u4f7f\u3046\u5b9f\u88c5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b8\u30cb\u4e0d\u7d14\u5ea6\u306f\u5e73\u65b9\u8a08\u7b97\u3060\u3051\u3067\u6e08\u3080\u305f\u3081\u3001\u8a08\u7b97\u304c\u6bd4\u8f03\u7684\u5358\u7d14\u3067\u3059\u3002\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u306f\u5bfe\u6570\u3092\u4f7f\u3044\u3001\u6df7\u5728\u306e\u5909\u5316\u3092\u7570\u306a\u308b\u5f62\u3067\u8a55\u4fa1\u3057\u307e\u3059\u3002\u30c7\u30fc\u30bf\u3084\u5019\u88dc\u5206\u5272\u306b\u3088\u3063\u3066\u6700\u826f\u306e\u5206\u5272\u304c\u5165\u308c\u66ff\u308f\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u591a\u304f\u306e\u5b9f\u52d9\u30c7\u30fc\u30bf\u3067\u306f\u4e88\u6e2c\u6027\u80fd\u306b\u5927\u304d\u306a\u5dee\u304c\u51fa\u306a\u3044\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002\u6307\u6a19\u3092\u9078\u3076\u3068\u304d\u306f\u3001\u691c\u8a3c\u30c7\u30fc\u30bf\u3067\u306e\u7d50\u679c\u3001\u8a08\u7b97\u30b3\u30b9\u30c8\u3001\u65e2\u5b58\u30e2\u30c7\u30eb\u3068\u306e\u6bd4\u8f03\u53ef\u80fd\u6027\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"gini-criterion\" class=\"wp-block-heading\"><strong>\u5b9f\u88c5\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3067\u6307\u5b9a\u3059\u308b<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">scikit-learn\u306e <code>DecisionTreeClassifier<\/code> \u3067\u306f\u3001<code>criterion=\"gini\"<\/code> \u304c\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3001<code>criterion=\"entropy\"<\/code> \u3084 <code>criterion=\"log_loss\"<\/code> \u304c\u60c5\u5831\u91cf\u306b\u57fa\u3065\u304f\u57fa\u6e96\u3067\u3059\u3002\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u3088\u3063\u3066\u5229\u7528\u3067\u304d\u308b\u5024\u304c\u7570\u306a\u308b\u5834\u5408\u304c\u3042\u308b\u305f\u3081\u3001\u5b9f\u884c\u74b0\u5883\u306e\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u57fa\u6e96\u3092\u5909\u66f4\u3057\u305f\u3068\u304d\u306f\u3001\u6728\u306e\u6df1\u3055\u3084\u4e71\u6570\u3001\u526a\u5b9a\u6761\u4ef6\u306a\u3069\u4ed6\u306e\u8a2d\u5b9a\u3092\u56fa\u5b9a\u3057\u3066\u6bd4\u8f03\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 id=\"gini-tree-control\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3068\u904e\u5b66\u7fd2\uff5c\u6728\u3092\u6df1\u304f\u3057\u3059\u304e\u306a\u3044\u305f\u3081\u306e\u5236\u5fa1<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3092\u4e0b\u3052\u308b\u5206\u5272\u3092\u7e70\u308a\u8fd4\u3059\u3068\u3001\u8a13\u7df4\u30c7\u30fc\u30bf\u306b\u5bfe\u3057\u3066\u975e\u5e38\u306b\u7d14\u7c8b\u306a\u5c0f\u30ce\u30fc\u30c9\u3092\u4f5c\u308c\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u30b5\u30f3\u30d7\u30eb\u304c\u5c11\u306a\u3044\u30ce\u30fc\u30c9\u307e\u3067\u5206\u5272\u3059\u308b\u3068\u3001\u5076\u7136\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u899a\u3048\u3066\u672a\u77e5\u30c7\u30fc\u30bf\u3067\u8aa4\u308b\u904e\u5b66\u7fd2\u304c\u8d77\u304d\u307e\u3059\u3002<code>max_depth<\/code>\u3001<code>min_samples_split<\/code>\u3001<code>min_samples_leaf<\/code> \u306a\u3069\u306e\u5236\u7d04\u3092\u4f7f\u3044\u3001\u4ea4\u5dee\u691c\u8a3c\u3067\u6df1\u3055\u3068\u6c4e\u5316\u6027\u80fd\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30e9\u30b9\u304c\u4e0d\u5747\u8861\u306a\u5834\u5408\u3001\u5358\u7d14\u306b\u4e0d\u7d14\u5ea6\u3092\u4e0b\u3052\u308b\u3060\u3051\u3067\u306f\u591a\u6570\u6d3e\u30af\u30e9\u30b9\u3092\u3088\u304f\u5206\u3051\u308b\u6728\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<code>class_weight<\/code> \u306e\u8a2d\u5b9a\u3001\u8a55\u4fa1\u6307\u6a19\u306e\u898b\u76f4\u3057\u3001\u5c11\u6570\u30af\u30e9\u30b9\u306e\u518d\u73fe\u7387\u78ba\u8a8d\u3092\u7d44\u307f\u5408\u308f\u305b\u307e\u3059\u3002\u5b66\u7fd2\u6642\u306b\u91cd\u307f\u3092\u4ed8\u3051\u308b\u3068\u3001\u5206\u5272\u306e\u8a55\u4fa1\u306b\u3082\u5f71\u97ff\u3059\u308b\u305f\u3081\u3001\u91cd\u307f\u306e\u610f\u5473\u3068\u691c\u8a3c\u65b9\u6cd5\u3092\u8a18\u9332\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 id=\"gini-importance\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u30b8\u30cb\u4e0d\u7d14\u5ea6\u304b\u3089\u7279\u5fb4\u91cf\u91cd\u8981\u5ea6\u3092\u8aad\u3080\u3068\u304d\u306e\u6ce8\u610f\u70b9<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6c7a\u5b9a\u6728\u3084\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3067\u306f\u3001\u5404\u5206\u5272\u306b\u3088\u308b\u4e0d\u7d14\u5ea6\u306e\u6e1b\u5c11\u3092\u5408\u8a08\u3057\u3066\u7279\u5fb4\u91cf\u91cd\u8981\u5ea6\u3092\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u4e0d\u7d14\u5ea6\u30d9\u30fc\u30b9\u306e\u91cd\u8981\u5ea6\u3001MDI\u3068\u3082\u547c\u3070\u308c\u307e\u3059\u3002\u6728\u304c\u3069\u306e\u7279\u5fb4\u91cf\u3092\u5206\u5272\u306b\u4f7f\u3063\u305f\u304b\u3092\u8981\u7d04\u3067\u304d\u308b\u4e00\u65b9\u3001\u5024\u306e\u7a2e\u985e\u304c\u591a\u3044\u9023\u7d9a\u7279\u5fb4\u91cf\u3084\u30ab\u30c6\u30b4\u30ea\u6570\u306e\u591a\u3044\u7279\u5fb4\u91cf\u3092\u904e\u5927\u8a55\u4fa1\u3057\u3084\u3059\u3044\u6027\u8cea\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u91cd\u8981\u5ea6\u304c\u9ad8\u3044\u304b\u3089\u3068\u3044\u3063\u3066\u3001\u305d\u306e\u7279\u5fb4\u91cf\u304c\u539f\u56e0\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002\u76f8\u95a2\u3057\u305f\u7279\u5fb4\u91cf\u304c\u3042\u308b\u3068\u91cd\u8981\u5ea6\u304c\u5206\u6563\u3057\u305f\u308a\u3001\u7247\u65b9\u306b\u504f\u3063\u305f\u308a\u3057\u307e\u3059\u3002\u30e2\u30c7\u30eb\u3092\u8aac\u660e\u3059\u308b\u76ee\u7684\u306a\u3089\u3001\u691c\u8a3c\u30c7\u30fc\u30bf\u306e\u7f6e\u63db\u306b\u3088\u308bPermutation Importance\u3084\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066SHAP\u306a\u3069\u5225\u306e\u65b9\u6cd5\u3082\u6bd4\u8f03\u3057\u307e\u3059\u3002\u8a55\u4fa1\u30c7\u30fc\u30bf\u3092\u4f7f\u3063\u3066\u91cd\u8981\u5ea6\u3092\u7b97\u51fa\u3059\u308b\u5834\u5408\u3082\u3001\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u3092\u7e70\u308a\u8fd4\u3057\u898b\u3066\u7279\u5fb4\u91cf\u3092\u9078\u3070\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"gini-permutation\" class=\"wp-block-heading\"><strong>Permutation Importance\u3068\u306e\u9055\u3044<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Permutation Importance\u306f\u3001\u691c\u8a3c\u30c7\u30fc\u30bf\u306e\u3042\u308b\u7279\u5fb4\u91cf\u3092\u30b7\u30e3\u30c3\u30d5\u30eb\u3057\u3001\u4e88\u6e2c\u6027\u80fd\u304c\u3069\u308c\u3060\u3051\u60aa\u5316\u3059\u308b\u304b\u3092\u6e2c\u308a\u307e\u3059\u3002\u30e2\u30c7\u30eb\u306e\u6c4e\u5316\u6027\u80fd\u306b\u5bfe\u3059\u308b\u5bc4\u4e0e\u3092\u898b\u3084\u3059\u3044\u53cd\u9762\u3001\u76f8\u95a2\u3057\u305f\u7279\u5fb4\u91cf\u3092\u30b7\u30e3\u30c3\u30d5\u30eb\u3059\u308b\u3068\u3001\u4ee3\u66ff\u306e\u7279\u5fb4\u91cf\u304c\u6b8b\u3063\u3066\u6027\u80fd\u304c\u3042\u307e\u308a\u843d\u3061\u306a\u3044\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002MDI\u3068Permutation Importance\u304c\u4e00\u81f4\u3057\u306a\u3044\u3068\u304d\u306f\u3001\u76f8\u95a2\u3001\u7279\u5fb4\u91cf\u306e\u7a2e\u985e\u3001\u8a55\u4fa1\u30c7\u30fc\u30bf\u306e\u30b5\u30a4\u30ba\u3092\u8abf\u3079\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"gini-practical\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3092\u5b9f\u52d9\u3067\u78ba\u8a8d\u3059\u308b\u624b\u9806<\/strong><\/h2>\n\n\n\n<h3 id=\"gini-data\" class=\"wp-block-heading\"><strong>1. \u30af\u30e9\u30b9\u5b9a\u7fa9\u3068\u5206\u5272\u5358\u4f4d\u3092\u56fa\u5b9a\u3059\u308b<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305a\u3001\u5404\u30af\u30e9\u30b9\u306e\u610f\u5473\u3001\u5224\u5b9a\u671f\u9650\u3001\u9664\u5916\u6761\u4ef6\u3092\u6587\u66f8\u5316\u3057\u307e\u3059\u3002\u540c\u3058\u9867\u5ba2\u3084\u6848\u4ef6\u306e\u30ec\u30b3\u30fc\u30c9\u304c\u8907\u6570\u3042\u308b\u5834\u5408\u306f\u3001\u5b66\u7fd2\u3068\u30c6\u30b9\u30c8\u306b\u307e\u305f\u304c\u3089\u306a\u3044\u3088\u3046\u30b0\u30eb\u30fc\u30d7\u5206\u5272\u3092\u691c\u8a0e\u3057\u307e\u3059\u3002\u6642\u7cfb\u5217\u306a\u3089\u672a\u6765\u306e\u30e9\u30d9\u30eb\u60c5\u5831\u304c\u904e\u53bb\u306e\u7279\u5fb4\u91cf\u3078\u5165\u3089\u306a\u3044\u3088\u3046\u3001\u4e88\u6e2c\u6642\u70b9\u3092\u5148\u306b\u6c7a\u3081\u307e\u3059\u3002\u5206\u5272\u5358\u4f4d\u304c\u66d6\u6627\u306a\u307e\u307e\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3092\u4e0b\u3052\u3066\u3082\u3001\u5b9f\u904b\u7528\u3067\u518d\u73fe\u3057\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<h3 id=\"gini-baseline\" class=\"wp-block-heading\"><strong>2. \u30d9\u30fc\u30b9\u30e9\u30a4\u30f3\u3068\u4ea4\u5dee\u691c\u8a3c\u3092\u7528\u610f\u3059\u308b<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u591a\u6570\u6d3e\u30af\u30e9\u30b9\u3092\u5e38\u306b\u4e88\u6e2c\u3059\u308b\u30d9\u30fc\u30b9\u30e9\u30a4\u30f3\u3092\u4f5c\u308a\u3001\u6c7a\u5b9a\u6728\u304c\u3069\u308c\u3060\u3051\u6539\u5584\u3057\u305f\u304b\u3092accuracy\u3060\u3051\u3067\u306a\u304f\u3001\u5c11\u6570\u30af\u30e9\u30b9\u306e\u518d\u73fe\u7387\u3084\u6df7\u540c\u884c\u5217\u3067\u78ba\u8a8d\u3057\u307e\u3059\u3002\u6728\u306e\u6df1\u3055\u3084\u5206\u5272\u57fa\u6e96\u306f\u8a13\u7df4\u30c7\u30fc\u30bf\u5185\u306e\u4ea4\u5dee\u691c\u8a3c\u3067\u6bd4\u8f03\u3057\u3001\u6700\u7d42\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306f\u4e00\u5ea6\u3060\u3051\u8a55\u4fa1\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"gini-visualize\" class=\"wp-block-heading\"><strong>3. \u6728\u306e\u69cb\u9020\u3068\u8449\u306e\u30b5\u30f3\u30d7\u30eb\u6570\u3092\u78ba\u8a8d\u3059\u308b<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5b66\u7fd2\u5f8c\u306f\u3001\u5404\u30ce\u30fc\u30c9\u306e\u6761\u4ef6\u3001\u30af\u30e9\u30b9\u5272\u5408\u3001\u30b5\u30f3\u30d7\u30eb\u6570\u3001\u4e88\u6e2c\u30af\u30e9\u30b9\u3092\u53ef\u8996\u5316\u3057\u307e\u3059\u3002\u6df1\u3044\u6728\u3067\u8449\u306e\u30b5\u30f3\u30d7\u30eb\u304c\u6570\u4ef6\u3057\u304b\u306a\u3044\u5834\u5408\u3001\u30b8\u30cb\u4e0d\u7d14\u5ea6\u304c0\u3067\u3082\u6c4e\u5316\u3059\u308b\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002\u8a13\u7df4\u3068\u691c\u8a3c\u306e\u6307\u6a19\u3092\u4e26\u3079\u3001\u6df1\u3055\u3092\u5897\u3084\u3057\u305f\u3068\u304d\u306b\u691c\u8a3c\u6027\u80fd\u304c\u4f4e\u4e0b\u3057\u3066\u3044\u306a\u3044\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from sklearn.tree import DecisionTreeClassifier\n\nclf = DecisionTreeClassifier(criterion=\"gini\", max_depth=4, random_state=42)\nclf.fit(X_train, y_train)\nprint(clf.feature_importances_)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u306f\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3092\u5206\u5272\u57fa\u6e96\u306b\u6307\u5b9a\u3059\u308b\u6700\u5c0f\u4f8b\u3067\u3059\u3002<code>feature_importances_<\/code> \u306f\u4e0d\u7d14\u5ea6\u30d9\u30fc\u30b9\u306e\u91cd\u8981\u5ea6\u3067\u3042\u308a\u3001\u56e0\u679c\u52b9\u679c\u3084\u4e88\u6e2c\u306e\u5b89\u5b9a\u6027\u3092\u76f4\u63a5\u793a\u3057\u307e\u305b\u3093\u3002\u5b66\u7fd2\u30c7\u30fc\u30bf\u306e\u518d\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3084\u5225\u306e\u6642\u671f\u306e\u30c7\u30fc\u30bf\u3067\u91cd\u8981\u5ea6\u304c\u5927\u304d\u304f\u5909\u308f\u308b\u306a\u3089\u3001\u7279\u5fb4\u91cf\u306e\u63a1\u7528\u5224\u65ad\u3092\u4fdd\u7559\u3057\u3001Permutation Importance\u3084\u5916\u90e8\u77e5\u8b58\u3092\u4f75\u305b\u3066\u691c\u8a0e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"gini-limitations\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u30b8\u30cb\u4e0d\u7d14\u5ea6\u306e\u9650\u754c\uff5c\u6570\u5024\u3092\u5358\u72ec\u3067\u89e3\u91c8\u3057\u306a\u3044<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b8\u30cb\u4e0d\u7d14\u5ea6\u306f\u30ce\u30fc\u30c9\u5185\u306e\u30e9\u30d9\u30eb\u5206\u5e03\u3092\u8981\u7d04\u3059\u308b\u5024\u3067\u3001\u7279\u5fb4\u91cf\u3068\u76ee\u7684\u5909\u6570\u306e\u56e0\u679c\u95a2\u4fc2\u3092\u8868\u3057\u307e\u305b\u3093\u3002\u30e9\u30d9\u30eb\u306b\u8aa4\u308a\u304c\u3042\u308b\u3001\u5b66\u7fd2\u6642\u306b\u5c06\u6765\u60c5\u5831\u304c\u6df7\u3056\u308b\u3001\u30ab\u30c6\u30b4\u30ea\u3092\u6570\u5024\u3068\u3057\u3066\u8aa4\u3063\u3066\u6271\u3046\u3068\u3044\u3063\u305f\u554f\u984c\u304c\u3042\u308c\u3070\u3001\u7d14\u5ea6\u306e\u9ad8\u3044\u6728\u3067\u3082\u5b9f\u904b\u7528\u3067\u5931\u6557\u3057\u307e\u3059\u3002\u30c7\u30fc\u30bf\u751f\u6210\u904e\u7a0b\u3068\u524d\u51e6\u7406\u3092\u76e3\u67fb\u3057\u3001\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306e\u72ec\u7acb\u6027\u3092\u5b88\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305f\u3001\u30b8\u30cb\u4e0d\u7d14\u5ea6\u306f\u30af\u30e9\u30b9\u6570\u3001\u30af\u30e9\u30b9\u5272\u5408\u3001\u30b5\u30f3\u30d7\u30eb\u91cd\u307f\u306b\u4f9d\u5b58\u3057\u307e\u3059\u3002\u7570\u306a\u308b\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u306e\u300c0.2\u300d\u3068\u300c0.2\u300d\u3092\u540c\u3058\u610f\u5473\u3068\u307f\u306a\u3055\u305a\u3001\u540c\u3058\u30af\u30e9\u30b9\u5b9a\u7fa9\u3068\u8a55\u4fa1\u6761\u4ef6\u3067\u6bd4\u8f03\u3057\u307e\u3059\u3002\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3067\u306f\u591a\u6570\u306e\u6728\u306e\u5e73\u5747\u7684\u306a\u91cd\u8981\u5ea6\u306b\u306a\u308b\u305f\u3081\u3001\u5358\u4e00\u6728\u306e\u5206\u5272\u7406\u7531\u3068\u30a2\u30f3\u30b5\u30f3\u30d6\u30eb\u5168\u4f53\u306e\u91cd\u8981\u5ea6\u3092\u5206\u3051\u3066\u8aac\u660e\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 id=\"gini-summary\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u30b8\u30cb\u4e0d\u7d14\u5ea6\u307e\u3068\u3081\uff5c\u5206\u5272\u306e\u826f\u3055\u3068\u30e2\u30c7\u30eb\u8aac\u660e\u3092\u5207\u308a\u5206\u3051\u308b<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b8\u30cb\u4e0d\u7d14\u5ea6\u306f\u3001\u6c7a\u5b9a\u6728\u306e\u30ce\u30fc\u30c9\u306b\u30af\u30e9\u30b9\u304c\u3069\u308c\u3060\u3051\u6df7\u5728\u3057\u3066\u3044\u308b\u304b\u3092\u6e2c\u308b\u6307\u6a19\u3067\u3059\u3002<code>1-\u03a3p_k\u00b2<\/code> \u3067\u8a08\u7b97\u3057\u3001\u5206\u5272\u5f8c\u306e\u5b50\u30ce\u30fc\u30c9\u306e\u52a0\u91cd\u5e73\u5747\u3092\u5c0f\u3055\u304f\u3059\u308b\u6761\u4ef6\u3092\u6c7a\u5b9a\u6728\u304c\u9078\u3073\u307e\u3059\u3002\u5024\u304c0\u306b\u8fd1\u3044\u30ce\u30fc\u30c9\u306f\u30af\u30e9\u30b9\u304c\u305d\u308d\u3063\u3066\u3044\u307e\u3059\u304c\u3001\u30b5\u30f3\u30d7\u30eb\u6570\u304c\u5c11\u306a\u3044\u7d14\u7c8b\u306a\u8449\u306f\u904e\u5b66\u7fd2\u306e\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u3068\u7d50\u679c\u3092\u6bd4\u8f03\u3057\u3001\u6728\u306e\u6df1\u3055\u3084\u8449\u306e\u6700\u5c0f\u30b5\u30f3\u30d7\u30eb\u6570\u3092\u4ea4\u5dee\u691c\u8a3c\u3067\u8abf\u6574\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u7279\u5fb4\u91cf\u91cd\u8981\u5ea6\u3092\u8aad\u3080\u3068\u304d\u306f\u3001\u4e0d\u7d14\u5ea6\u30d9\u30fc\u30b9\u306e\u504f\u308a\u3001\u76f8\u95a2\u3001\u30c7\u30fc\u30bf\u30ea\u30fc\u30af\u3092\u78ba\u8a8d\u3057\u3001Permutation Importance\u3084\u6df7\u540c\u884c\u5217\u306a\u3069\u3092\u4f75\u7528\u3057\u307e\u3059\u3002\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3092\u300c\u7cbe\u5ea6\u300d\u3084\u300c\u539f\u56e0\u300d\u3068\u6df7\u540c\u305b\u305a\u3001\u5206\u5272\u57fa\u6e96\u3068\u8aac\u660e\u624b\u6cd5\u3092\u5225\u3005\u306b\u8a55\u4fa1\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 id=\"faq\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u3088\u304f\u3042\u308b\u8cea\u554f\uff08FAQ\uff09<\/strong><\/h2>\n\n\n\n<h3 id=\"q-gini-definition\" class=\"wp-block-heading\"><strong>Q. \u30b8\u30cb\u4e0d\u7d14\u5ea6\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3068\u306f\u3001\u6c7a\u5b9a\u6728\u306e\u30ce\u30fc\u30c9\u5185\u3067\u7570\u306a\u308b\u30af\u30e9\u30b9\u304c\u3069\u308c\u3060\u3051\u6df7\u5728\u3057\u3066\u3044\u308b\u304b\u3092\u8868\u3059\u6307\u6a19\u3067\u3059\u3002\u5024\u304c0\u306b\u8fd1\u3044\u307b\u3069\u4e00\u3064\u306e\u30af\u30e9\u30b9\u306b\u305d\u308d\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"q-gini-zero\" class=\"wp-block-heading\"><strong>Q. \u30b8\u30cb\u4e0d\u7d14\u5ea6\u304c0\u306a\u3089\u30e2\u30c7\u30eb\u306f\u6b63\u3057\u3044\u3067\u3059\u304b\uff1f<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u3044\u3044\u3048\u3002\u5b66\u7fd2\u30c7\u30fc\u30bf\u306e\u5c0f\u3055\u306a\u8449\u3067\u4e0d\u7d14\u5ea6\u304c0\u3067\u3082\u3001\u672a\u77e5\u30c7\u30fc\u30bf\u3067\u6b63\u3057\u304f\u5206\u985e\u3067\u304d\u308b\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002\u6728\u306e\u6df1\u3055\u3001\u8449\u306e\u30b5\u30f3\u30d7\u30eb\u6570\u3001\u691c\u8a3c\u30c7\u30fc\u30bf\u306e\u6027\u80fd\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"q-gini-entropy\" class=\"wp-block-heading\"><strong>Q. \u30b8\u30cb\u4e0d\u7d14\u5ea6\u3068\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u306f\u3069\u3061\u3089\u304c\u512a\u308c\u3066\u3044\u307e\u3059\u304b\uff1f<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u5f8b\u306e\u512a\u52a3\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u4e21\u65b9\u3068\u3082\u30af\u30e9\u30b9\u306e\u6df7\u5728\u3092\u6e2c\u308a\u307e\u3059\u304c\u8a08\u7b97\u5f0f\u304c\u7570\u306a\u308a\u307e\u3059\u3002\u6df1\u3055\u3084\u4e71\u6570\u306a\u3069\u3092\u305d\u308d\u3048\u3001\u691c\u8a3c\u30c7\u30fc\u30bf\u306e\u6027\u80fd\u3068\u8a08\u7b97\u30b3\u30b9\u30c8\u3067\u9078\u3073\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"q-gini-importance\" class=\"wp-block-heading\"><strong>Q. \u30b8\u30cb\u4e0d\u7d14\u5ea6\u306b\u3088\u308b\u7279\u5fb4\u91cf\u91cd\u8981\u5ea6\u306f\u56e0\u679c\u95a2\u4fc2\u3092\u793a\u3057\u307e\u3059\u304b\uff1f<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u793a\u3057\u307e\u305b\u3093\u3002\u4e0d\u7d14\u5ea6\u30d9\u30fc\u30b9\u306e\u91cd\u8981\u5ea6\u306f\u5206\u5272\u306b\u3088\u308b\u4e88\u6e2c\u4e0a\u306e\u5bc4\u4e0e\u3092\u8981\u7d04\u3059\u308b\u5024\u3067\u3001\u76f8\u95a2\u3084\u30ab\u30c6\u30b4\u30ea\u6570\u306e\u5f71\u97ff\u3092\u53d7\u3051\u307e\u3059\u3002\u56e0\u679c\u52b9\u679c\u3068\u89e3\u91c8\u305b\u305a\u3001Permutation Importance\u306a\u3069\u3082\u6bd4\u8f03\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"q-gini-imbalance\" class=\"wp-block-heading\"><strong>Q. \u30af\u30e9\u30b9\u4e0d\u5747\u8861\u3067\u306f\u30b8\u30cb\u4e0d\u7d14\u5ea6\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u304b\uff1f<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5fc5\u8981\u3067\u3059\u3002\u591a\u6570\u6d3e\u30af\u30e9\u30b9\u4e2d\u5fc3\u306e\u5206\u5272\u306b\u306a\u308a\u3084\u3059\u3044\u305f\u3081\u3001\u30af\u30e9\u30b9\u5225\u306e\u518d\u73fe\u7387\u3084\u6df7\u540c\u884c\u5217\u3092\u78ba\u8a8d\u3057\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066class_weight\u3084\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3092\u691c\u8a0e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3068\u306f\u3001\u6c7a\u5b9a\u6728\u306e\u30ce\u30fc\u30c9\u5185\u3067\u7570\u306a\u308b\u30af\u30e9\u30b9\u304c\u3069\u308c\u3060\u3051\u6df7\u5728\u3057\u3066\u3044\u308b\u304b\u3092\u8868\u3059\u6307\u6a19\u3067\u3059\u3002\u5024\u304c0\u306b\u8fd1\u3044\u307b\u3069\u4e00\u3064\u306e\u30af\u30e9\u30b9\u306b\u305d\u308d\u3063\u3066\u3044\u307e\u3059\u3002\"}},{\"@type\":\"Question\",\"name\":\"\u30b8\u30cb\u4e0d\u7d14\u5ea6\u304c0\u306a\u3089\u30e2\u30c7\u30eb\u306f\u6b63\u3057\u3044\u3067\u3059\u304b\uff1f\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"\u3044\u3044\u3048\u3002\u5b66\u7fd2\u30c7\u30fc\u30bf\u306e\u5c0f\u3055\u306a\u8449\u3067\u4e0d\u7d14\u5ea6\u304c0\u3067\u3082\u3001\u672a\u77e5\u30c7\u30fc\u30bf\u3067\u6b63\u3057\u304f\u5206\u985e\u3067\u304d\u308b\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002\u6728\u306e\u6df1\u3055\u3001\u8449\u306e\u30b5\u30f3\u30d7\u30eb\u6570\u3001\u691c\u8a3c\u30c7\u30fc\u30bf\u306e\u6027\u80fd\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\"}},{\"@type\":\"Question\",\"name\":\"\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3068\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u306f\u3069\u3061\u3089\u304c\u512a\u308c\u3066\u3044\u307e\u3059\u304b\uff1f\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"\u4e00\u5f8b\u306e\u512a\u52a3\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u4e21\u65b9\u3068\u3082\u30af\u30e9\u30b9\u306e\u6df7\u5728\u3092\u6e2c\u308a\u307e\u3059\u304c\u8a08\u7b97\u5f0f\u304c\u7570\u306a\u308a\u307e\u3059\u3002\u6df1\u3055\u3084\u4e71\u6570\u306a\u3069\u3092\u305d\u308d\u3048\u3001\u691c\u8a3c\u30c7\u30fc\u30bf\u306e\u6027\u80fd\u3068\u8a08\u7b97\u30b3\u30b9\u30c8\u3067\u9078\u3073\u307e\u3059\u3002\"}},{\"@type\":\"Question\",\"name\":\"\u30b8\u30cb\u4e0d\u7d14\u5ea6\u306b\u3088\u308b\u7279\u5fb4\u91cf\u91cd\u8981\u5ea6\u306f\u56e0\u679c\u95a2\u4fc2\u3092\u793a\u3057\u307e\u3059\u304b\uff1f\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"\u793a\u3057\u307e\u305b\u3093\u3002\u4e0d\u7d14\u5ea6\u30d9\u30fc\u30b9\u306e\u91cd\u8981\u5ea6\u306f\u5206\u5272\u306b\u3088\u308b\u4e88\u6e2c\u4e0a\u306e\u5bc4\u4e0e\u3092\u8981\u7d04\u3059\u308b\u5024\u3067\u3001\u76f8\u95a2\u3084\u30ab\u30c6\u30b4\u30ea\u6570\u306e\u5f71\u97ff\u3092\u53d7\u3051\u307e\u3059\u3002\u56e0\u679c\u52b9\u679c\u3068\u89e3\u91c8\u305b\u305a\u3001Permutation Importance\u306a\u3069\u3082\u6bd4\u8f03\u3057\u307e\u3059\u3002\"}},{\"@type\":\"Question\",\"name\":\"\u30af\u30e9\u30b9\u4e0d\u5747\u8861\u3067\u306f\u30b8\u30cb\u4e0d\u7d14\u5ea6\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u304b\uff1f\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"\u5fc5\u8981\u3067\u3059\u3002\u591a\u6570\u6d3e\u30af\u30e9\u30b9\u4e2d\u5fc3\u306e\u5206\u5272\u306b\u306a\u308a\u3084\u3059\u3044\u305f\u3081\u3001\u30af\u30e9\u30b9\u5225\u306e\u518d\u73fe\u7387\u3084\u6df7\u540c\u884c\u5217\u3092\u78ba\u8a8d\u3057\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066class_weight\u3084\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3092\u691c\u8a0e\u3057\u307e\u3059\u3002\"}}]}\n<\/script>\n\n\n\n<h2 id=\"references\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u53c2\u8003\u8cc7\u6599<\/strong><\/h2>\n\n\n<ul class=\"wp-block-list\"><li>scikit-learn\u300cDecisionTreeClassifier\u300d<br><a href=\"https:\/\/scikit-learn.org\/stable\/modules\/generated\/sklearn.tree.DecisionTreeClassifier.html\" target=\"_blank\" rel=\"noopener\">https:\/\/scikit-learn.org\/stable\/modules\/generated\/sklearn.tree.DecisionTreeClassifier.html<\/a><\/li><li>scikit-learn User Guide\u300cDecision Trees\u300d<br><a href=\"https:\/\/scikit-learn.org\/stable\/modules\/tree.html\" target=\"_blank\" rel=\"noopener\">https:\/\/scikit-learn.org\/stable\/modules\/tree.html<\/a><\/li><li>scikit-learn User Guide\u300cFeature importance evaluation\u300d<br><a href=\"https:\/\/scikit-learn.org\/stable\/auto_examples\/inspection\/plot_permutation_importance.html\" target=\"_blank\" rel=\"noopener\">https:\/\/scikit-learn.org\/stable\/auto_examples\/inspection\/plot_permutation_importance.html<\/a><\/li><\/ul>\n\n","protected":false},"excerpt":{"rendered":"<p>\u30b8\u30cb\u4e0d\u7d14\u5ea6\u3068\u306f\u3001\u6c7a\u5b9a\u6728\u306e\u30ce\u30fc\u30c9\u306b\u7570\u306a\u308b\u30af\u30e9\u30b9\u304c\u3069\u306e\u7a0b\u5ea6\u6df7\u5728\u3057\u3066\u3044\u308b\u304b\u3092\u8868\u3059\u6307\u6a19\u3067\u3059\u3002\u5206\u985e\u6728\u306f\u3001\u7279\u5fb4\u91cf\u306e\u6761\u4ef6\u3067\u30c7\u30fc\u30bf\u3092\u5206\u5272\u3057\u3001\u5206\u5272\u5f8c\u306e\u30ce\u30fc\u30c9\u304c\u3067\u304d\u308b\u3060\u3051\u4e00\u3064\u306e\u30af\u30e9\u30b9\u306b\u305d\u308d\u3046\u3088\u3046\u306b\u5b66\u7fd2\u3057\u307e\u3059\u3002\u305d\u306e\u300c\u305d\u308d\u3044\u5177\u5408\u300d\u3092\u8a55\u4fa1\u3059\u308b\u4ee3\u8868 [&hellip;]<\/p>\n","protected":false},"author":266270553,"featured_media":58,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"{title}\n\n{excerpt}\n\n{url}","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_wpas_customize_per_network":false,"jetpack_post_was_ever_published":false},"categories":[30723332],"tags":[],"class_list":["post-47112","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-system"],"jetpack_publicize_connections":[],"jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/pgydx5-cfS","jetpack-related-posts":[{"id":47114,"url":"https:\/\/www.ripla.co.jp\/blog\/system\/tree-pruning\/","url_meta":{"origin":47112,"position":0},"title":"\u679d\u5208\u308a\u3068\u306f\uff1f\u6c7a\u5b9a\u6728\u306e\u904e\u5b66\u7fd2\u5bfe\u7b56\u30fb\u65b9\u6cd5\u30fb\u8a55\u4fa1\u3092\u89e3\u8aac","author":"\u682a\u5f0f\u4f1a\u793eripla\u30e1\u30f3\u30d0\u30fc","date":"2026\u5e748\u670814\u65e5","format":false,"excerpt":"\u679d\u5208\u308a\u3068\u306f\u3001\u6c7a\u5b9a\u6728\u306e\u679d\u3084\u8449\u3092\u524a\u9664\u3057\u3066\u3001\u6728\u304c\u5b66\u7fd2\u30c7\u30fc\u30bf\u306b\u9069\u5408\u3057\u3059\u304e\u308b\u3053\u3068\u3092\u6291\u3048\u308b\u624b\u6cd5\u3067\u3059\u3002\u6c7a\u5b9a\u6728\u306f\u5206\u5272\u2026","rel":"","context":"\u30b7\u30b9\u30c6\u30e0\u958b\u767a","block_context":{"text":"\u30b7\u30b9\u30c6\u30e0\u958b\u767a","link":"https:\/\/www.ripla.co.jp\/blog\/category\/system\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.ripla.co.jp\/blog\/wp-content\/uploads\/2025\/05\/22212851.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.ripla.co.jp\/blog\/wp-content\/uploads\/2025\/05\/22212851.jpg?resize=350%2C200&ssl=1 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