{"id":47114,"date":"2026-08-14T14:02:20","date_gmt":"2026-08-14T05:02:20","guid":{"rendered":"https:\/\/www.ripla.co.jp\/blog\/?p=47114"},"modified":"2026-08-31T19:38:50","modified_gmt":"2026-08-31T10:38:50","slug":"tree-pruning","status":"publish","type":"post","link":"https:\/\/www.ripla.co.jp\/blog\/system\/tree-pruning\/","title":{"rendered":"\u679d\u5208\u308a\u3068\u306f\uff1f\u6c7a\u5b9a\u6728\u306e\u904e\u5b66\u7fd2\u5bfe\u7b56\u30fb\u65b9\u6cd5\u30fb\u8a55\u4fa1\u3092\u89e3\u8aac"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\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\u3092\u7d9a\u3051\u308b\u3068\u8a13\u7df4\u30c7\u30fc\u30bf\u3092\u7d30\u304b\u304f\u5206\u985e\u3067\u304d\u307e\u3059\u304c\u3001\u30b5\u30f3\u30d7\u30eb\u56fa\u6709\u306e\u5076\u7136\u307e\u3067\u899a\u3048\u3001\u672a\u77e5\u30c7\u30fc\u30bf\u3067\u6027\u80fd\u304c\u4e0b\u304c\u308b\u904e\u5b66\u7fd2\u3092\u8d77\u3053\u3059\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u679d\u5208\u308a\u3067\u306f\u3001\u4e88\u6e2c\u306b\u307b\u3068\u3093\u3069\u5bc4\u4e0e\u3057\u306a\u3044\u5206\u5272\u3084\u3001\u30b5\u30f3\u30d7\u30eb\u304c\u5c11\u306a\u3059\u304e\u308b\u8449\u3092\u53d6\u308a\u9664\u304d\u3001\u6c4e\u5316\u6027\u80fd\u3068\u8aac\u660e\u3057\u3084\u3059\u3055\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u6574\u3048\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u679d\u5208\u308a\u306b\u306f\u3001\u6728\u3092\u6210\u9577\u3055\u305b\u306a\u304c\u3089\u5206\u5272\u3092\u5236\u9650\u3059\u308b\u4e8b\u524d\u679d\u5208\u308a\u3068\u3001\u3044\u3063\u305f\u3093\u5927\u304d\u306a\u6728\u3092\u4f5c\u3063\u3066\u304b\u3089\u4e0d\u8981\u306a\u679d\u3092\u524a\u308b\u4e8b\u5f8c\u679d\u5208\u308a\u304c\u3042\u308a\u307e\u3059\u3002scikit-learn\u3067\u306f\u3001\u6700\u5927\u6df1\u3055\u3084\u8449\u306e\u6700\u5c0f\u30b5\u30f3\u30d7\u30eb\u6570\u3001\u8907\u96d1\u5ea6\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u3088\u308b\u30b3\u30b9\u30c8\u8907\u96d1\u5ea6\u679d\u5208\u308a\u3092\u5229\u7528\u3067\u304d\u307e\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f\u3001\u679d\u5208\u308a\u306e\u610f\u5473\u3001\u904e\u5b66\u7fd2\u3068\u306e\u95a2\u4fc2\u3001\u4ee3\u8868\u7684\u306a\u30d1\u30e9\u30e1\u30fc\u30bf\u3001\u4ea4\u5dee\u691c\u8a3c\u306b\u3088\u308b\u9078\u3073\u65b9\u3001\u8a55\u4fa1\u3068\u904b\u7528\u4e0a\u306e\u6ce8\u610f\u70b9\u3092\u6574\u7406\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"pruning-overview\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u679d\u5208\u308a\u3068\u306f\uff1f\u6c7a\u5b9a\u6728\u306e\u8907\u96d1\u3055\u3092\u6291\u3048\u3066\u6c4e\u5316\u6027\u80fd\u3092\u9ad8\u3081\u308b\u65b9\u6cd5<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6c7a\u5b9a\u6728\u306f\u3001\u7279\u5fb4\u91cf\u306e\u6761\u4ef6\u3067\u30c7\u30fc\u30bf\u3092\u4e8c\u3064\u4ee5\u4e0a\u306e\u5b50\u30ce\u30fc\u30c9\u3078\u5206\u3051\u3001\u5206\u5272\u5f8c\u306e\u30af\u30e9\u30b9\u4e0d\u7d14\u5ea6\u3084\u8aa4\u5dee\u3092\u4e0b\u3052\u308b\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3057\u307e\u3059\u3002\u6df1\u3044\u6728\u3067\u306f\u3001\u8a13\u7df4\u30c7\u30fc\u30bf\u306e1\u4ef6\u3060\u3051\u3092\u5206\u3051\u308b\u6761\u4ef6\u307e\u3067\u4f5c\u308c\u308b\u305f\u3081\u3001\u8a13\u7df4\u30b9\u30b3\u30a2\u306f\u9ad8\u304f\u306a\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u305d\u306e\u6761\u4ef6\u304c\u65b0\u3057\u3044\u30c7\u30fc\u30bf\u3067\u3082\u6709\u52b9\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002\u679d\u5208\u308a\u306f\u3001\u6728\u306e\u69cb\u9020\u3092\u5c0f\u3055\u304f\u3057\u3066\u3001\u5076\u7136\u306e\u5206\u5272\u3092\u4e88\u6e2c\u30eb\u30fc\u30eb\u304b\u3089\u5916\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u679d\u5208\u308a\u306e\u76ee\u7684\u306f\u3001\u8a13\u7df4\u30c7\u30fc\u30bf\u306e\u6b63\u89e3\u7387\u3092\u6700\u5927\u5316\u3059\u308b\u3053\u3068\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u691c\u8a3c\u30c7\u30fc\u30bf\u3084\u5c06\u6765\u30c7\u30fc\u30bf\u3067\u5b89\u5b9a\u3057\u3066\u4e88\u6e2c\u3067\u304d\u308b\u3053\u3068\u3001\u30eb\u30fc\u30eb\u3092\u4eba\u304c\u78ba\u8a8d\u3067\u304d\u308b\u3053\u3068\u3001\u63a8\u8ad6\u3084\u4fdd\u5b88\u306e\u30b3\u30b9\u30c8\u3092\u6291\u3048\u308b\u3053\u3068\u3092\u542b\u3081\u3066\u3001\u9069\u5207\u306a\u8907\u96d1\u3055\u3092\u9078\u3076\u3053\u3068\u3067\u3059\u3002\u8449\u3092\u524a\u308a\u3059\u304e\u308b\u3068\u4eca\u5ea6\u306f\u8868\u73fe\u529b\u304c\u4e0d\u8db3\u3059\u308b\u305f\u3081\u3001\u30a2\u30f3\u30c0\u30fc\u30d5\u30a3\u30c3\u30c6\u30a3\u30f3\u30b0\u3068\u306e\u30d0\u30e9\u30f3\u30b9\u3082\u8a55\u4fa1\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"pruning-overfitting\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u679d\u5208\u308a\u3068\u904e\u5b66\u7fd2\u306e\u95a2\u4fc2\uff5c\u8a13\u7df4\u6027\u80fd\u3068\u691c\u8a3c\u6027\u80fd\u306e\u5dee\u3092\u898b\u308b<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6728\u306e\u6df1\u3055\u3084\u8449\u306e\u6570\u3092\u6a2a\u8ef8\u3001\u8a13\u7df4\u30b9\u30b3\u30a2\u3068\u691c\u8a3c\u30b9\u30b3\u30a2\u3092\u7e26\u8ef8\u306b\u3057\u3066\u6bd4\u8f03\u3059\u308b\u3068\u3001\u679d\u5208\u308a\u306e\u52b9\u679c\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002\u6d45\u3044\u6728\u3067\u306f\u4e21\u65b9\u306e\u30b9\u30b3\u30a2\u304c\u4f4e\u304f\u3001\u6df1\u304f\u3059\u308b\u306b\u3064\u308c\u3066\u691c\u8a3c\u30b9\u30b3\u30a2\u304c\u6539\u5584\u3057\u307e\u3059\u3002\u3055\u3089\u306b\u6df1\u304f\u3059\u308b\u3068\u8a13\u7df4\u30b9\u30b3\u30a2\u3060\u3051\u304c\u4e0a\u304c\u308a\u3001\u691c\u8a3c\u30b9\u30b3\u30a2\u304c\u4e0b\u304c\u308b\u9818\u57df\u304c\u73fe\u308c\u307e\u3059\u3002\u679d\u5208\u308a\u306f\u3001\u3053\u306e\u904e\u5b66\u7fd2\u9818\u57df\u3078\u5165\u308b\u524d\u3001\u307e\u305f\u306f\u5165\u3063\u305f\u5f8c\u306b\u6728\u3092\u7c21\u7d20\u5316\u3059\u308b\u64cd\u4f5c\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5206\u985e\u3067\u306f\u6b63\u89e3\u7387\u3060\u3051\u3067\u306a\u304f\u3001\u5c11\u6570\u30af\u30e9\u30b9\u306e\u518d\u73fe\u7387\u3001\u9069\u5408\u7387\u3001F1\u3001\u6df7\u540c\u884c\u5217\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u56de\u5e30\u3067\u306fMAE\u3084RMSE\u3001\u4e88\u6e2c\u6b8b\u5dee\u306e\u5206\u5e03\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u30af\u30e9\u30b9\u4e0d\u5747\u8861\u3084\u5916\u308c\u5024\u304c\u3042\u308b\u3068\u3001\u5358\u4e00\u306e\u30b9\u30b3\u30a2\u304c\u679d\u306e\u9078\u629e\u3092\u8aa4\u3089\u305b\u308b\u3053\u3068\u304c\u3042\u308b\u305f\u3081\u3001\u696d\u52d9\u4e0a\u306e\u8aa4\u308a\u30b3\u30b9\u30c8\u306b\u5408\u308f\u305b\u305f\u6307\u6a19\u3092\u4f7f\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 id=\"pruning-pre\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u4e8b\u524d\u679d\u5208\u308a\u306e\u65b9\u6cd5\uff5c\u6728\u3092\u6210\u9577\u3055\u305b\u308b\u6bb5\u968e\u3067\u5236\u9650\u3059\u308b<\/strong><\/h2>\n\n\n\n<h3 id=\"pruning-max-depth\" class=\"wp-block-heading\"><strong>max_depth\u3067\u6df1\u3055\u3092\u5236\u9650\u3059\u308b<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\"><code>max_depth<\/code> \u306f\u3001\u6839\u304b\u3089\u8449\u307e\u3067\u306e\u6700\u5927\u6df1\u3055\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u5024\u3092\u5c0f\u3055\u304f\u3059\u308b\u3068\u3001\u6728\u306e\u30eb\u30fc\u30eb\u304c\u77ed\u304f\u306a\u308a\u3001\u5c40\u6240\u7684\u306a\u5206\u5272\u3092\u6291\u3048\u3089\u308c\u307e\u3059\u3002\u5927\u304d\u3059\u304e\u308b\u3068\u904e\u5b66\u7fd2\u3057\u3001\u5c0f\u3055\u3059\u304e\u308b\u3068\u8907\u96d1\u306a\u95a2\u4fc2\u3092\u8868\u73fe\u3067\u304d\u307e\u305b\u3093\u3002\u5019\u88dc\u5024\u3092\u4ea4\u5dee\u691c\u8a3c\u3067\u6bd4\u8f03\u3057\u3001\u8a13\u7df4\u30b9\u30b3\u30a2\u3068\u691c\u8a3c\u30b9\u30b3\u30a2\u306e\u5dee\u3001\u30eb\u30fc\u30eb\u306e\u9577\u3055\u3092\u8a18\u9332\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"pruning-min-split\" class=\"wp-block-heading\"><strong>min_samples_split\u3067\u5206\u5272\u306b\u5fc5\u8981\u306a\u4ef6\u6570\u3092\u6307\u5b9a\u3059\u308b<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\"><code>min_samples_split<\/code> \u306f\u3001\u30ce\u30fc\u30c9\u3092\u3055\u3089\u306b\u5206\u5272\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u6700\u5c0f\u30b5\u30f3\u30d7\u30eb\u6570\u3067\u3059\u3002\u5024\u3092\u5897\u3084\u3059\u3068\u3001\u5c11\u6570\u30c7\u30fc\u30bf\u3060\u3051\u3067\u4f5c\u308b\u679d\u304c\u6e1b\u308a\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u5272\u5408\u3067\u6307\u5b9a\u3059\u308b\u5834\u5408\u306f\u30c7\u30fc\u30bf\u6570\u306b\u5fdc\u3058\u3066\u5b9f\u969b\u306e\u4ef6\u6570\u304c\u5909\u308f\u308b\u305f\u3081\u3001\u5b66\u7fd2\u30c7\u30fc\u30bf\u306e\u30b5\u30a4\u30ba\u3092\u5909\u3048\u305f\u3068\u304d\u306e\u6319\u52d5\u3082\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h3 id=\"pruning-min-leaf\" class=\"wp-block-heading\"><strong>min_samples_leaf\u3067\u8449\u306e\u6700\u5c0f\u4ef6\u6570\u3092\u4fdd\u8a3c\u3059\u308b<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\"><code>min_samples_leaf<\/code> \u306f\u3001\u5206\u5272\u5f8c\u306e\u5404\u8449\u306b\u6b8b\u3059\u6700\u5c0f\u30b5\u30f3\u30d7\u30eb\u6570\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u8449\u304c1\u4ef6\u3060\u3051\u306b\u306a\u308b\u3053\u3068\u3092\u9632\u304e\u3001\u5206\u985e\u78ba\u7387\u3084\u56de\u5e30\u5e73\u5747\u306e\u3070\u3089\u3064\u304d\u3092\u6291\u3048\u308b\u52b9\u679c\u304c\u3042\u308a\u307e\u3059\u3002\u9867\u5ba2\u3084\u5e97\u8217\u306a\u3069\u540c\u3058\u30b0\u30eb\u30fc\u30d7\u306e\u89b3\u6e2c\u304c\u8907\u6570\u3042\u308b\u5834\u5408\u306f\u3001\u5358\u306a\u308b\u4ef6\u6570\u3067\u306f\u306a\u304f\u3001\u30b0\u30eb\u30fc\u30d7\u5358\u4f4d\u306e\u8a55\u4fa1\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h3 id=\"pruning-min-impurity\" class=\"wp-block-heading\"><strong>min_impurity_decrease\u3067\u6539\u5584\u5e45\u3092\u8981\u6c42\u3059\u308b<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\"><code>min_impurity_decrease<\/code> \u306f\u3001\u5206\u5272\u306b\u3088\u3063\u3066\u4e0d\u7d14\u5ea6\u304c\u4e00\u5b9a\u4ee5\u4e0a\u6539\u5584\u3059\u308b\u5834\u5408\u306b\u3060\u3051\u5206\u5272\u3092\u8a31\u53ef\u3059\u308b\u30d1\u30e9\u30e1\u30fc\u30bf\u3067\u3059\u3002\u308f\u305a\u304b\u306a\u6539\u5584\u3057\u304b\u306a\u3044\u5206\u5272\u3092\u9664\u3051\u308b\u4e00\u65b9\u3001\u30b5\u30f3\u30d7\u30eb\u91cd\u307f\u3084\u30af\u30e9\u30b9\u91cd\u307f\u3092\u4f7f\u3046\u3068\u8a08\u7b97\u3055\u308c\u308b\u6539\u5584\u5e45\u3082\u5909\u308f\u308a\u307e\u3059\u3002\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u610f\u5473\u3092\u5b9f\u88c5\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3067\u78ba\u8a8d\u3057\u3001\u91cd\u307f\u3092\u542b\u3080\u5b66\u7fd2\u6761\u4ef6\u3092\u56fa\u5b9a\u3057\u3066\u6bd4\u8f03\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"pruning-post\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u4e8b\u5f8c\u679d\u5208\u308a\u306e\u65b9\u6cd5\uff5c\u5927\u304d\u306a\u6728\u304b\u3089\u4e0d\u8981\u306a\u679d\u3092\u524a\u308b<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e8b\u5f8c\u679d\u5208\u308a\u3067\u306f\u3001\u307e\u305a\u505c\u6b62\u6761\u4ef6\u3092\u7de9\u3081\u305f\u6728\u3092\u6210\u9577\u3055\u305b\u3001\u8907\u96d1\u306a\u5019\u88dc\u3092\u4f5c\u308a\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001\u4e88\u6e2c\u6027\u80fd\u3092\u5927\u304d\u304f\u640d\u306a\u308f\u306a\u3044\u679d\u3092\u9806\u306b\u524a\u308a\u307e\u3059\u3002\u5019\u88dc\u3092\u6bd4\u8f03\u3057\u3084\u3059\u3044\u53cd\u9762\u3001\u6700\u5927\u306e\u6728\u3092\u4f5c\u308b\u305f\u3081\u5b66\u7fd2\u6642\u306e\u8a08\u7b97\u91cf\u3084\u30e1\u30e2\u30ea\u304c\u5897\u3048\u307e\u3059\u3002\u30c7\u30fc\u30bf\u304c\u5c11\u306a\u3044\u5834\u5408\u306f\u3001\u4e8b\u524d\u679d\u5208\u308a\u3068\u4ea4\u5dee\u691c\u8a3c\u3092\u7d44\u307f\u5408\u308f\u305b\u3001\u904e\u5ea6\u306b\u5927\u304d\u306a\u6728\u3092\u4f5c\u3089\u306a\u3044\u8a2d\u8a08\u3082\u691c\u8a0e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"pruning-cost-complexity\" class=\"wp-block-heading\"><strong>\u30b3\u30b9\u30c8\u8907\u96d1\u5ea6\u679d\u5208\u308a\u3068ccp_alpha<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">scikit-learn\u306e\u6c7a\u5b9a\u6728\u3067\u306f\u3001\u30b3\u30b9\u30c8\u8907\u96d1\u5ea6\u679d\u5208\u308a\u3092 <code>ccp_alpha<\/code> \u3067\u5236\u5fa1\u3067\u304d\u307e\u3059\u3002\u6728\u306e\u4e0d\u7d14\u5ea6\u306b\u3001\u8449\u306e\u6570\u306b\u5fdc\u3058\u305f\u8907\u96d1\u3055\u306e\u30da\u30ca\u30eb\u30c6\u30a3\u3092\u52a0\u3048\u3001\u5408\u8a08\u306e\u8a55\u4fa1\u304c\u5c0f\u3055\u304f\u306a\u308b\u90e8\u5206\u6728\u3092\u9078\u3076\u8003\u3048\u65b9\u3067\u3059\u3002<code>ccp_alpha=0<\/code> \u3067\u306f\u901a\u5e38\u3001\u4e8b\u5f8c\u679d\u5208\u308a\u3092\u884c\u308f\u305a\u3001\u5024\u3092\u5927\u304d\u304f\u3059\u308b\u307b\u3069\u8907\u96d1\u306a\u679d\u304c\u524a\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from sklearn.tree import DecisionTreeClassifier\n\ntree = DecisionTreeClassifier(random_state=42)\npath = tree.cost_complexity_pruning_path(X_train, y_train)\nalphas = path.ccp_alphas\n\nmodels = [DecisionTreeClassifier(ccp_alpha=a, random_state=42).fit(X_train, y_train)\n          for a in alphas]<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>cost_complexity_pruning_path<\/code> \u306f\u3001\u679d\u3092\u524a\u308b\u5019\u88dc\u3068\u306a\u308b\u8907\u96d1\u5ea6\u30d1\u30e9\u30e1\u30fc\u30bf\u3068\u4e0d\u7d14\u5ea6\u306e\u60c5\u5831\u3092\u8fd4\u3057\u307e\u3059\u3002\u3059\u3079\u3066\u306e\u5019\u88dc\u3092\u305d\u306e\u307e\u307e\u63a1\u7528\u305b\u305a\u3001\u8a13\u7df4\u30c7\u30fc\u30bf\u5185\u306e\u4ea4\u5dee\u691c\u8a3c\u3067\u691c\u8a3c\u30b9\u30b3\u30a2\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002\u6700\u7d42\u7684\u306a\u8a55\u4fa1\u306b\u306f\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u9078\u629e\u306b\u4f7f\u3063\u3066\u3044\u306a\u3044\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u3092\u4e00\u5ea6\u3060\u3051\u4f7f\u3044\u3001\u9078\u629e\u5f8c\u306e\u6027\u80fd\u3092\u5831\u544a\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 id=\"pruning-selection\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u679d\u5208\u308a\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u9078\u3076\u624b\u9806\uff5c\u4ea4\u5dee\u691c\u8a3c\u3068\u696d\u52d9\u5236\u7d04\u3092\u7d44\u307f\u5408\u308f\u305b\u308b<\/strong><\/h2>\n\n\n\n<h3 id=\"pruning-step1\" class=\"wp-block-heading\"><strong>1. \u76ee\u7684\u3068\u8a55\u4fa1\u6307\u6a19\u3092\u6c7a\u3081\u308b<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305a\u3001\u8aa4\u5206\u985e\u3084\u4e88\u6e2c\u8aa4\u5dee\u306e\u3069\u308c\u3092\u6e1b\u3089\u3057\u305f\u3044\u304b\u3092\u6c7a\u3081\u307e\u3059\u3002\u533b\u7642\u306e\u30b9\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u306a\u3089\u5c11\u6570\u30af\u30e9\u30b9\u306e\u898b\u9003\u3057\u3001\u5be9\u67fb\u306a\u3089\u8aa4\u627f\u8a8d\u3068\u8aa4\u5374\u4e0b\u3001\u4e88\u6e2c\u5024\u306a\u3089\u8a31\u5bb9\u3067\u304d\u308b\u91d1\u984d\u3084\u6642\u9593\u306e\u305a\u308c\u304c\u91cd\u8981\u3067\u3059\u3002\u5358\u7d14\u306aaccuracy\u3060\u3051\u3067\u679d\u5208\u308a\u306e\u8a2d\u5b9a\u3092\u9078\u3076\u3068\u3001\u696d\u52d9\u4e0a\u91cd\u8981\u306a\u30af\u30e9\u30b9\u306e\u6027\u80fd\u304c\u96a0\u308c\u308b\u305f\u3081\u3001\u4e3b\u6307\u6a19\u3068\u88dc\u52a9\u6307\u6a19\u3092\u4e8b\u524d\u306b\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"pruning-step2\" class=\"wp-block-heading\"><strong>2. \u30c7\u30fc\u30bf\u5206\u5272\u3068\u524d\u51e6\u7406\u3092\u56fa\u5b9a\u3059\u308b<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u9078\u3076\u691c\u8a3c\u30c7\u30fc\u30bf\u3068\u6700\u7d42\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u3092\u5206\u3051\u307e\u3059\u3002\u6642\u7cfb\u5217\u306a\u3089\u672a\u6765\u306e\u671f\u9593\u3092\u8a55\u4fa1\u5074\u306b\u7f6e\u304d\u3001\u540c\u3058\u9867\u5ba2\u3084\u8a2d\u5099\u304c\u5b66\u7fd2\u5074\u3068\u30c6\u30b9\u30c8\u5074\u306b\u307e\u305f\u304c\u308b\u306a\u3089\u30b0\u30eb\u30fc\u30d7\u5206\u5272\u3092\u691c\u8a0e\u3057\u307e\u3059\u3002\u6b20\u640d\u88dc\u5b8c\u3084\u30ab\u30c6\u30b4\u30ea\u5909\u63db\u306e\u57fa\u6e96\u306f\u5b66\u7fd2\u5206\u5272\u3060\u3051\u3067\u9069\u5408\u3055\u305b\u3001\u30c6\u30b9\u30c8\u60c5\u5831\u304c\u679d\u306e\u9078\u629e\u306b\u6f0f\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"pruning-step3\" class=\"wp-block-heading\"><strong>3. \u691c\u8a3c\u30b9\u30b3\u30a2\u3068\u6728\u306e\u8907\u96d1\u3055\u3092\u4e26\u3079\u308b<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5404\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u3064\u3044\u3066\u3001\u691c\u8a3c\u30b9\u30b3\u30a2\u3001\u8449\u306e\u6570\u3001\u6df1\u3055\u3001\u5b66\u7fd2\u6642\u9593\u3001\u63a8\u8ad6\u6642\u9593\u3092\u8a18\u9332\u3057\u307e\u3059\u3002\u30b9\u30b3\u30a2\u304c\u307b\u307c\u540c\u3058\u306a\u3089\u3001\u8449\u304c\u5c11\u306a\u304f\u8aac\u660e\u3057\u3084\u3059\u3044\u6728\u3092\u9078\u3076\u3053\u3068\u306b\u4fa1\u5024\u304c\u3042\u308a\u307e\u3059\u3002\u4ea4\u5dee\u691c\u8a3c\u306e\u5e73\u5747\u3060\u3051\u3067\u306a\u304f\u3001\u5206\u5272\u3054\u3068\u306e\u3070\u3089\u3064\u304d\u3082\u898b\u3066\u3001\u7279\u5b9a\u306e\u671f\u9593\u3084\u30b0\u30eb\u30fc\u30d7\u306b\u3060\u3051\u4f9d\u5b58\u3057\u3066\u3044\u306a\u3044\u304b\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"pruning-step4\" class=\"wp-block-heading\"><strong>4. \u6700\u7d42\u30c6\u30b9\u30c8\u3068\u518d\u5b66\u7fd2\u3092\u884c\u3046<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u8a2d\u5b9a\u3092\u9078\u3093\u3060\u3089\u3001\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u3067\u4e00\u5ea6\u3060\u3051\u8a55\u4fa1\u3057\u307e\u3059\u3002\u554f\u984c\u304c\u306a\u3051\u308c\u3070\u3001\u904b\u7528\u3067\u5229\u7528\u3059\u308b\u5b66\u7fd2\u30c7\u30fc\u30bf\u5168\u4f53\u306b\u540c\u3058\u8a2d\u5b9a\u3067\u518d\u5b66\u7fd2\u3057\u307e\u3059\u3002\u518d\u5b66\u7fd2\u5f8c\u306e\u6728\u306f\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u9078\u629e\u6642\u3068\u69cb\u9020\u304c\u5909\u308f\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u30eb\u30fc\u30eb\u3001\u7279\u5fb4\u91cf\u306e\u9806\u5e8f\u3001\u30af\u30e9\u30b9\u5bfe\u5fdc\u3001\u30e2\u30c7\u30eb\u30d5\u30a1\u30a4\u30eb\u306e\u30cf\u30c3\u30b7\u30e5\u3092\u4fdd\u5b58\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"pruning-interpretability\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u679d\u5208\u308a\u306e\u52b9\u679c\uff5c\u6027\u80fd\u30fb\u8aac\u660e\u6027\u30fb\u904b\u7528\u30b3\u30b9\u30c8\u3092\u8a55\u4fa1\u3059\u308b<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u679d\u5208\u308a\u5f8c\u306e\u6728\u306f\u3001\u6761\u4ef6\u5206\u5c90\u304c\u6e1b\u308b\u305f\u3081\u3001\u4eba\u304c\u78ba\u8a8d\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002\u5be9\u67fb\u3084\u55b6\u696d\u652f\u63f4\u306a\u3069\u3001\u4e88\u6e2c\u7406\u7531\u3092\u8aac\u660e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u696d\u52d9\u3067\u306f\u3001\u6df1\u3044\u6728\u3088\u308a\u77ed\u3044\u30eb\u30fc\u30eb\u304c\u9069\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u6d45\u304f\u3059\u308c\u3070\u5fc5\u305a\u8aac\u660e\u304c\u6b63\u78ba\u306b\u306a\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u5404\u8449\u306e\u30b5\u30f3\u30d7\u30eb\u6570\u3001\u30af\u30e9\u30b9\u5272\u5408\u3001\u9069\u7528\u6761\u4ef6\u3092\u8868\u793a\u3057\u3001\u8aac\u660e\u5bfe\u8c61\u306e\u30b1\u30fc\u30b9\u304c\u3069\u306e\u8449\u306b\u5230\u9054\u3057\u305f\u304b\u3092\u8ffd\u8de1\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u63a8\u8ad6\u901f\u5ea6\u3084\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3082\u3001\u6728\u304c\u5c0f\u3055\u304f\u306a\u308b\u307b\u3069\u6539\u5584\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u4f4e\u9045\u5ef6\u306eAPI\u3084\u30a8\u30c3\u30b8\u7aef\u672b\u3067\u306f\u3001\u7cbe\u5ea6\u304c\u5c11\u3057\u4e0b\u304c\u3063\u3066\u3082\u3001\u8a08\u7b97\u91cf\u304c\u5b89\u5b9a\u3059\u308b\u6728\u3092\u63a1\u7528\u3059\u308b\u4fa1\u5024\u304c\u3042\u308a\u307e\u3059\u3002\u4e00\u65b9\u3001\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3084\u52fe\u914d\u30d6\u30fc\u30b9\u30c6\u30a3\u30f3\u30b0\u306e\u5404\u6728\u3092\u500b\u5225\u306b\u679d\u5208\u308a\u3059\u308b\u5834\u5408\u306f\u3001\u30a2\u30f3\u30b5\u30f3\u30d6\u30eb\u5168\u4f53\u306e\u691c\u8a3c\u304c\u5fc5\u8981\u3067\u3059\u3002\u5358\u4e00\u6728\u3067\u5f97\u305f\u52b9\u679c\u3092\u3001\u305d\u306e\u307e\u307e\u30a2\u30f3\u30b5\u30f3\u30d6\u30eb\u3078\u5f53\u3066\u306f\u3081\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 id=\"pruning-failure\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u679d\u5208\u308a\u3067\u5931\u6557\u3057\u3084\u3059\u3044\u70b9\u3068\u5bfe\u7b56<\/strong><\/h2>\n\n\n\n<h3 id=\"pruning-leakage\" class=\"wp-block-heading\"><strong>\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u3092\u30d1\u30e9\u30e1\u30fc\u30bf\u9078\u629e\u306b\u4f7f\u3046<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">ccp_alpha\u3084max_depth\u3092\u30c6\u30b9\u30c8\u30b9\u30b3\u30a2\u3092\u898b\u306a\u304c\u3089\u8abf\u6574\u3059\u308b\u3068\u3001\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u3078\u904e\u5b66\u7fd2\u3057\u307e\u3059\u3002\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306f\u6700\u7d42\u78ba\u8a8d\u3060\u3051\u306b\u6b8b\u3057\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u9078\u629e\u306f\u8a13\u7df4\u30c7\u30fc\u30bf\u5185\u306e\u4ea4\u5dee\u691c\u8a3c\u3067\u884c\u3044\u307e\u3059\u3002\u30c6\u30b9\u30c8\u7d50\u679c\u304c\u671f\u5f85\u3088\u308a\u60aa\u304b\u3063\u305f\u5834\u5408\u306b\u3001\u540c\u3058\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u3067\u4f55\u5ea6\u3082\u8a2d\u5b9a\u3092\u5909\u3048\u306a\u3044\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h3 id=\"pruning-small-leaf\" class=\"wp-block-heading\"><strong>\u30b5\u30f3\u30d7\u30eb\u306e\u5c11\u306a\u3044\u8449\u3092\u6027\u80fd\u3060\u3051\u3067\u8a55\u4fa1\u3059\u308b<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u8a13\u7df4\u30c7\u30fc\u30bf\u3067\u4e0d\u7d14\u5ea60\u306e\u8449\u304c\u591a\u304f\u3066\u3082\u3001\u5404\u8449\u304c\u6570\u4ef6\u3057\u304b\u306a\u3051\u308c\u3070\u65b0\u3057\u3044\u30c7\u30fc\u30bf\u3067\u4e0d\u5b89\u5b9a\u306b\u306a\u308a\u307e\u3059\u3002\u8449\u3054\u3068\u306e\u4ef6\u6570\u3068\u691c\u8a3c\u6642\u306e\u8aa4\u308a\u3092\u78ba\u8a8d\u3057\u3001min_samples_leaf\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u5c11\u6570\u30af\u30e9\u30b9\u306e\u8449\u3092\u5358\u7d14\u306b\u524a\u308b\u3068\u898b\u9003\u3057\u304c\u5897\u3048\u308b\u5834\u5408\u304c\u3042\u308b\u305f\u3081\u3001\u30af\u30e9\u30b9\u5225\u6307\u6a19\u3092\u4f75\u8a18\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"pruning-distribution\" class=\"wp-block-heading\"><strong>\u5206\u5e03\u306e\u5909\u5316\u3092\u8003\u616e\u3057\u306a\u3044<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u672c\u756a\u306e\u30af\u30e9\u30b9\u5272\u5408\u3084\u7279\u5fb4\u91cf\u306e\u5206\u5e03\u304c\u5b66\u7fd2\u6642\u304b\u3089\u5909\u308f\u308b\u3068\u3001\u679d\u5208\u308a\u3067\u9078\u3093\u3060\u6728\u306e\u6027\u80fd\u3082\u5909\u5316\u3057\u307e\u3059\u3002\u671f\u9593\u5225\u3001\u5730\u57df\u5225\u3001\u9867\u5ba2\u5c5e\u6027\u5225\u306b\u8a55\u4fa1\u3057\u3001\u30c7\u30fc\u30bf\u30c9\u30ea\u30d5\u30c8\u3092\u76e3\u8996\u3057\u307e\u3059\u3002\u518d\u5b66\u7fd2\u306e\u57fa\u6e96\u3001\u6728\u306e\u6df1\u3055\u3084\u8449\u6570\u306e\u4e0a\u9650\u3001\u6027\u80fd\u304c\u4e0b\u304c\u3063\u305f\u5834\u5408\u306e\u5207\u308a\u623b\u3057\u65b9\u6cd5\u3092\u904b\u7528\u624b\u9806\u306b\u542b\u3081\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 id=\"pruning-summary\" class=\"wp-block-heading\" style=\"background:#c3d3e1; padding:12px 20px; margin:32px 0 16px; color:#222;\"><strong>\u679d\u5208\u308a\u307e\u3068\u3081\uff5c\u691c\u8a3c\u30c7\u30fc\u30bf\u3067\u9069\u5207\u306a\u8907\u96d1\u3055\u3092\u9078\u3076<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u679d\u5208\u308a\u306f\u3001\u6c7a\u5b9a\u6728\u306e\u4e0d\u8981\u306a\u5206\u5272\u3092\u524a\u9664\u3057\u3001\u904e\u5b66\u7fd2\u3092\u6291\u3048\u306a\u304c\u3089\u6c4e\u5316\u6027\u80fd\u3068\u8aac\u660e\u6027\u3092\u6574\u3048\u308b\u65b9\u6cd5\u3067\u3059\u3002max_depth\u3001min_samples_split\u3001min_samples_leaf\u306a\u3069\u3067\u6210\u9577\u4e2d\u306e\u6728\u3092\u5236\u9650\u3059\u308b\u4e8b\u524d\u679d\u5208\u308a\u3068\u3001ccp_alpha\u3092\u4f7f\u3063\u3066\u5927\u304d\u306a\u6728\u304b\u3089\u90e8\u5206\u6728\u3092\u9078\u3076\u4e8b\u5f8c\u679d\u5208\u308a\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8a2d\u5b9a\u306f\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u3092\u898b\u305a\u306b\u4ea4\u5dee\u691c\u8a3c\u3067\u9078\u3073\u3001\u691c\u8a3c\u30b9\u30b3\u30a2\u3060\u3051\u3067\u306a\u304f\u3001\u8449\u6570\u3001\u6df1\u3055\u3001\u63a8\u8ad6\u30b3\u30b9\u30c8\u3001\u5c11\u6570\u30af\u30e9\u30b9\u306e\u6027\u80fd\u3001\u8aac\u660e\u306e\u3057\u3084\u3059\u3055\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002\u8a55\u4fa1\u6761\u4ef6\u3092\u56fa\u5b9a\u3057\u3001\u30c7\u30fc\u30bf\u5206\u5272\u3068\u524d\u51e6\u7406\u306e\u60c5\u5831\u6f0f\u3048\u3044\u3092\u9632\u304e\u307e\u3059\u3002\u6728\u3092\u5c0f\u3055\u304f\u3059\u308b\u3053\u3068\u81ea\u4f53\u3092\u76ee\u7684\u306b\u305b\u305a\u3001\u672a\u77e5\u30c7\u30fc\u30bf\u3067\u5b89\u5b9a\u3057\u3001\u696d\u52d9\u306e\u8aa4\u308a\u30b3\u30b9\u30c8\u306b\u5408\u3046\u30e2\u30c7\u30eb\u3092\u9078\u3093\u3067\u304f\u3060\u3055\u3044\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-pruning-definition\" class=\"wp-block-heading\"><strong>Q. \u679d\u5208\u308a\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u679d\u5208\u308a\u3068\u306f\u3001\u6c7a\u5b9a\u6728\u306e\u4e0d\u8981\u306a\u679d\u3084\u8449\u3092\u524a\u9664\u3057\u3001\u904e\u5b66\u7fd2\u3092\u6291\u3048\u308b\u624b\u6cd5\u3067\u3059\u3002\u6728\u306e\u8907\u96d1\u3055\u3092\u4e0b\u3052\u3001\u672a\u77e5\u30c7\u30fc\u30bf\u3067\u306e\u6c4e\u5316\u6027\u80fd\u3084\u8aac\u660e\u6027\u3092\u6539\u5584\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"q-pruning-pre-post\" class=\"wp-block-heading\"><strong>Q. \u4e8b\u524d\u679d\u5208\u308a\u3068\u4e8b\u5f8c\u679d\u5208\u308a\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u4e8b\u524d\u679d\u5208\u308a\u306f\u6728\u3092\u6210\u9577\u3055\u305b\u308b\u9014\u4e2d\u3067\u6df1\u3055\u3084\u30b5\u30f3\u30d7\u30eb\u6570\u3092\u5236\u9650\u3057\u307e\u3059\u3002\u4e8b\u5f8c\u679d\u5208\u308a\u306f\u5927\u304d\u306a\u6728\u3092\u4f5c\u3063\u3066\u304b\u3089\u3001\u8907\u96d1\u5ea6\u306e\u30da\u30ca\u30eb\u30c6\u30a3\u306a\u3069\u3067\u4e0d\u8981\u306a\u679d\u3092\u524a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"q-pruning-ccp\" class=\"wp-block-heading\"><strong>Q. ccp_alpha\u306f\u4f55\u3092\u8868\u3057\u307e\u3059\u304b\uff1f<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">ccp_alpha\u306f\u30b3\u30b9\u30c8\u8907\u96d1\u5ea6\u679d\u5208\u308a\u306e\u8907\u96d1\u5ea6\u30d1\u30e9\u30e1\u30fc\u30bf\u3067\u3059\u3002\u5927\u304d\u304f\u3059\u308b\u3068\u8449\u306e\u6570\u306b\u5bfe\u3059\u308b\u30da\u30ca\u30eb\u30c6\u30a3\u304c\u5f37\u304f\u306a\u308a\u3001\u3088\u308a\u5c0f\u3055\u306a\u90e8\u5206\u6728\u304c\u9078\u3070\u308c\u307e\u3059\u3002\u4ea4\u5dee\u691c\u8a3c\u3067\u5024\u3092\u6c7a\u3081\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"q-pruning-selection\" class=\"wp-block-heading\"><strong>Q. \u679d\u5208\u308a\u306e\u8a2d\u5b9a\u306f\u3069\u3046\u9078\u3073\u307e\u3059\u304b\uff1f<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u8a13\u7df4\u30c7\u30fc\u30bf\u5185\u306e\u4ea4\u5dee\u691c\u8a3c\u3067\u3001\u4e3b\u6307\u6a19\u3068\u88dc\u52a9\u6307\u6a19\u3001\u6728\u306e\u6df1\u3055\u3001\u8449\u6570\u3001\u63a8\u8ad6\u30b3\u30b9\u30c8\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002\u6700\u7d42\u7684\u306a\u6027\u80fd\u306f\u3001\u8a2d\u5b9a\u9078\u629e\u306b\u4f7f\u3063\u3066\u3044\u306a\u3044\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u3067\u4e00\u5ea6\u3060\u3051\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"q-pruning-deep\" class=\"wp-block-heading\"><strong>Q. \u6df1\u3044\u6c7a\u5b9a\u6728\u306f\u5fc5\u305a\u679d\u5208\u308a\u3059\u3079\u304d\u3067\u3059\u304b\uff1f<\/strong><\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5fc5\u305a\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u6df1\u3044\u6728\u306f\u904e\u5b66\u7fd2\u3057\u3084\u3059\u3044\u305f\u3081\u3001\u691c\u8a3c\u6027\u80fd\u3068\u8449\u306e\u30b5\u30f3\u30d7\u30eb\u6570\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u679d\u5208\u308a\u524d\u5f8c\u3092\u540c\u3058\u6761\u4ef6\u3067\u6bd4\u8f03\u3057\u3001\u7cbe\u5ea6\u3001\u8aac\u660e\u6027\u3001\u904b\u7528\u30b3\u30b9\u30c8\u306b\u5408\u3046\u8a2d\u5b9a\u3092\u9078\u3073\u307e\u3059\u3002<\/p>\n\n\n\n<script 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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\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\u300cMinimal Cost-Complexity Pruning\u300d<br><a href=\"https:\/\/scikit-learn.org\/stable\/auto_examples\/tree\/plot_cost_complexity_pruning.html\" target=\"_blank\" rel=\"noopener\">https:\/\/scikit-learn.org\/stable\/auto_examples\/tree\/plot_cost_complexity_pruning.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><\/ul>\n\n","protected":false},"excerpt":{"rendered":"<p>\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\u3092\u7d9a\u3051\u308b\u3068\u8a13\u7df4\u30c7\u30fc\u30bf\u3092\u7d30\u304b\u304f\u5206\u985e\u3067\u304d\u307e\u3059\u304c\u3001\u30b5\u30f3\u30d7\u30eb\u56fa\u6709\u306e\u5076\u7136\u307e\u3067\u899a\u3048\u3001\u672a\u77e5\u30c7\u30fc\u30bf\u3067\u6027\u80fd\u304c\u4e0b\u304c\u308b\u904e\u5b66\u7fd2\u3092\u8d77\u3053\u3059\u3053\u3068\u304c\u3042\u308a 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