{"id":477726,"date":"2023-08-09T09:19:17","date_gmt":"2023-08-09T09:19:17","guid":{"rendered":""},"modified":"2024-08-29T06:39:37","modified_gmt":"2024-08-29T06:39:37","slug":"isolation-forest","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/jp\/wiki\/isolation-forest\/","title":{"rendered":"\u5b64\u7acb\u306e\u68ee"},"content":{"rendered":"<p>Isolation Forest \u306f\u3001\u7570\u5e38\u691c\u51fa\u306b\u4f7f\u7528\u3055\u308c\u308b\u5f37\u529b\u306a\u6a5f\u68b0\u5b66\u7fd2\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u5927\u898f\u6a21\u306a\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u5185\u306e\u7570\u5e38\u3092\u52b9\u7387\u7684\u306b\u7279\u5b9a\u3059\u308b\u305f\u3081\u306e\u65b0\u3057\u3044\u65b9\u6cd5\u3068\u3057\u3066\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002\u901a\u5e38\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u30e2\u30c7\u30eb\u306e\u69cb\u7bc9\u306b\u4f9d\u5b58\u3059\u308b\u5f93\u6765\u306e\u65b9\u6cd5\u3068\u306f\u7570\u306a\u308a\u3001Isolation Forest \u306f\u7570\u5e38\u3092\u76f4\u63a5\u9694\u96e2\u3059\u308b\u3068\u3044\u3046\u7570\u306a\u308b\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u63a1\u7528\u3057\u307e\u3059\u3002<\/p>\n<h2>\u9694\u96e2\u306e\u68ee\u306e\u8d77\u6e90\u306e\u6b74\u53f2\u3068\u305d\u306e\u6700\u521d\u306e\u8a00\u53ca<\/h2>\n<p>Isolation Forest \u306e\u6982\u5ff5\u306f\u30012008 \u5e74\u306b Fei Tony Liu\u3001Kai Ming Ting\u3001Zhi-Hua Zhou \u306b\u3088\u3063\u3066\u300cIsolation-Based Anomaly Detection\u300d\u3068\u3044\u3046\u30bf\u30a4\u30c8\u30eb\u306e\u8ad6\u6587\u3067\u521d\u3081\u3066\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u30da\u30fc\u30d1\u30fc\u3067\u306f\u3001\u5206\u96e2\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30fc\u30bf \u30dd\u30a4\u30f3\u30c8\u306e\u7570\u5e38\u3092\u52b9\u679c\u7684\u306b\u691c\u51fa\u3059\u308b\u3068\u3044\u3046\u30a2\u30a4\u30c7\u30a2\u3092\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002\u305d\u308c\u4ee5\u6765\u3001Isolation Forest \u306f\u305d\u306e\u30b7\u30f3\u30d7\u30eb\u3055\u3068\u52b9\u7387\u6027\u306b\u3088\u308a\u3001\u7570\u5e38\u691c\u51fa\u306e\u5206\u91ce\u3067\u5927\u304d\u306a\u6ce8\u76ee\u3092\u96c6\u3081\u3066\u304d\u307e\u3057\u305f\u3002<\/p>\n<h2>\u5b64\u7acb\u306e\u68ee\u306e\u8a73\u7d30\u60c5\u5831<\/h2>\n<p>Isolation Forest \u306f\u3001\u30a2\u30f3\u30b5\u30f3\u30d6\u30eb\u5b66\u7fd2\u30d5\u30a1\u30df\u30ea\u30fc\u306b\u5c5e\u3059\u308b\u6559\u5e2b\u306a\u3057\u5b66\u7fd2\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u4e00\u7a2e\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u8907\u6570\u306e\u30c7\u30b7\u30b8\u30e7\u30f3 \u30c4\u30ea\u30fc\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u4e88\u6e2c\u3092\u884c\u3046\u30e9\u30f3\u30c0\u30e0 \u30d5\u30a9\u30ec\u30b9\u30c8\u306e\u6982\u5ff5\u3092\u6d3b\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u9694\u96e2\u306e\u68ee\u306e\u5834\u5408\u306f\u6728\u306e\u4f7f\u3044\u65b9\u304c\u9055\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u3001\u5404\u30c7\u30fc\u30bf \u30dd\u30a4\u30f3\u30c8\u304c\u72ec\u81ea\u306e\u30c4\u30ea\u30fc \u30ea\u30fc\u30d5\u5185\u3067\u5206\u96e2\u3055\u308c\u308b\u307e\u3067\u3001\u30c7\u30fc\u30bf \u30dd\u30a4\u30f3\u30c8\u3092\u30b5\u30d6\u30bb\u30c3\u30c8\u306b\u518d\u5e30\u7684\u306b\u5206\u5272\u3059\u308b\u3053\u3068\u3067\u6a5f\u80fd\u3057\u307e\u3059\u3002\u30d7\u30ed\u30bb\u30b9\u4e2d\u306b\u3001\u30c7\u30fc\u30bf \u30dd\u30a4\u30f3\u30c8\u3092\u5206\u96e2\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30f3\u306e\u6570\u304c\u3001\u305d\u308c\u304c\u7570\u5e38\u304b\u3069\u3046\u304b\u306e\u6307\u6a19\u306b\u306a\u308a\u307e\u3059\u3002\u7570\u5e38\u306f\u9694\u96e2\u307e\u3067\u306e\u30d1\u30b9\u304c\u77ed\u3044\u3068\u4e88\u60f3\u3055\u308c\u307e\u3059\u304c\u3001\u901a\u5e38\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f\u9694\u96e2\u306b\u6642\u9593\u304c\u304b\u304b\u308a\u307e\u3059\u3002<\/p>\n<h2>\u9694\u96e2\u306e\u68ee\u306e\u5185\u90e8\u69cb\u9020\u3002\u9694\u96e2\u306e\u68ee\u306e\u4ed5\u7d44\u307f<\/h2>\n<p>\u9694\u96e2\u30d5\u30a9\u30ec\u30b9\u30c8 \u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u6b21\u306e\u624b\u9806\u3067\u8981\u7d04\u3067\u304d\u307e\u3059\u3002<\/p>\n<ol>\n<li><strong>\u30e9\u30f3\u30c0\u30e0\u306a\u9078\u629e:<\/strong> \u7279\u5fb4\u91cf\u3068\u5206\u5272\u5024\u3092\u30e9\u30f3\u30c0\u30e0\u306b\u9078\u629e\u3057\u3066\u3001\u9078\u629e\u3057\u305f\u7279\u5fb4\u91cf\u306e\u6700\u5c0f\u5024\u3068\u6700\u5927\u5024\u306e\u9593\u306b\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30f3\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u518d\u5e30\u7684\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30cb\u30f3\u30b0:<\/strong> \u5404\u30c7\u30fc\u30bf \u30dd\u30a4\u30f3\u30c8\u304c\u72ec\u81ea\u306e\u30c4\u30ea\u30fc \u30ea\u30fc\u30d5\u5185\u3067\u5206\u96e2\u3055\u308c\u308b\u307e\u3067\u3001\u30e9\u30f3\u30c0\u30e0\u306a\u7279\u5fb4\u3092\u9078\u629e\u3057\u3066\u5024\u3092\u5206\u5272\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u518d\u5e30\u7684\u306b\u30c7\u30fc\u30bf\u306e\u5206\u5272\u3092\u7d9a\u3051\u307e\u3059\u3002<\/li>\n<li><strong>\u7d4c\u8def\u9577\u306e\u8a08\u7b97:<\/strong> \u30c7\u30fc\u30bf \u30dd\u30a4\u30f3\u30c8\u3054\u3068\u306b\u3001\u30eb\u30fc\u30c8 \u30ce\u30fc\u30c9\u304b\u3089\u30ea\u30fc\u30d5 \u30ce\u30fc\u30c9\u307e\u3067\u306e\u30d1\u30b9\u306e\u9577\u3055\u3092\u8a08\u7b97\u3057\u307e\u3059\u3002\u7570\u5e38\u306f\u901a\u5e38\u3001\u30d1\u30b9\u306e\u9577\u3055\u304c\u77ed\u304f\u306a\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u7570\u5e38\u30b9\u30b3\u30a2:<\/strong> \u8a08\u7b97\u3055\u308c\u305f\u30d1\u30b9\u9577\u306b\u57fa\u3065\u3044\u3066\u7570\u5e38\u30b9\u30b3\u30a2\u3092\u5272\u308a\u5f53\u3066\u307e\u3059\u3002\u30d1\u30b9\u304c\u77ed\u3044\u307b\u3069\u3001\u7570\u5e38\u30b9\u30b3\u30a2\u304c\u9ad8\u304f\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30d1\u30b9\u304c\u7570\u5e38\u3067\u3042\u308b\u53ef\u80fd\u6027\u304c\u9ad8\u3044\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u3057\u304d\u3044\u5024:<\/strong> \u7570\u5e38\u30b9\u30b3\u30a2\u306b\u3057\u304d\u3044\u5024\u3092\u8a2d\u5b9a\u3057\u3066\u3001\u3069\u306e\u30c7\u30fc\u30bf \u30dd\u30a4\u30f3\u30c8\u304c\u7570\u5e38\u3068\u307f\u306a\u3055\u308c\u308b\u304b\u3092\u6c7a\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<h2>Isolation Forest \u306e\u4e3b\u306a\u7279\u5fb4\u306e\u5206\u6790<\/h2>\n<p>Isolation Forest \u306b\u306f\u3001\u7570\u5e38\u691c\u51fa\u306e\u4e00\u822c\u7684\u306a\u9078\u629e\u80a2\u3068\u306a\u308b\u3044\u304f\u3064\u304b\u306e\u91cd\u8981\u306a\u6a5f\u80fd\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u52b9\u7387\uff1a<\/strong> Isolation Forest \u306f\u8a08\u7b97\u52b9\u7387\u304c\u9ad8\u304f\u3001\u5927\u898f\u6a21\u306a\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3092\u7c21\u5358\u306b\u51e6\u7406\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u5e73\u5747\u6642\u9593\u8a08\u7b97\u91cf\u306f\u7d04 O(n log n) \u3067\u3059 (n \u306f\u30c7\u30fc\u30bf \u30dd\u30a4\u30f3\u30c8\u306e\u6570\u3067\u3059)\u3002<\/li>\n<li><strong>\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3:<\/strong> \u3053\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u52b9\u7387\u6027\u306b\u3088\u308a\u3001\u9ad8\u6b21\u5143\u30c7\u30fc\u30bf\u307e\u3067\u9069\u5207\u306b\u62e1\u5f35\u3067\u304d\u308b\u305f\u3081\u3001\u591a\u6570\u306e\u6a5f\u80fd\u3092\u5099\u3048\u305f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n<li><strong>\u5916\u308c\u5024\u306b\u5bfe\u3057\u3066\u5805\u7262:<\/strong> Isolation Forest \u306f\u3001\u30c7\u30fc\u30bf\u5185\u306e\u5916\u308c\u5024\u3084\u30ce\u30a4\u30ba\u306e\u5b58\u5728\u306b\u5bfe\u3057\u3066\u5805\u7262\u3067\u3059\u3002\u5916\u308c\u5024\u306f\u3088\u308a\u8fc5\u901f\u306b\u5206\u96e2\u3055\u308c\u308b\u50be\u5411\u304c\u3042\u308a\u3001\u7570\u5e38\u691c\u51fa\u30d7\u30ed\u30bb\u30b9\u5168\u4f53\u3078\u306e\u5f71\u97ff\u304c\u8efd\u6e1b\u3055\u308c\u307e\u3059\u3002<\/li>\n<li><strong>\u30c7\u30fc\u30bf\u5206\u6563\u306b\u95a2\u3059\u308b\u524d\u63d0\u6761\u4ef6\u306a\u3057:<\/strong> \u30c7\u30fc\u30bf\u304c\u7279\u5b9a\u306e\u5206\u5e03\u306b\u5f93\u3046\u3068\u4eee\u5b9a\u3059\u308b\u4ed6\u306e\u7570\u5e38\u691c\u51fa\u65b9\u6cd5\u3068\u306f\u7570\u306a\u308a\u3001Isolation Forest \u306f\u5206\u5e03\u306e\u4eee\u5b9a\u3092\u884c\u308f\u306a\u3044\u305f\u3081\u3001\u3088\u308a\u6c4e\u7528\u6027\u304c\u9ad8\u304f\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<h2>\u9694\u96e2\u6797\u306e\u7a2e\u985e<\/h2>\n<p>Isolation Forest \u306b\u306f\u660e\u78ba\u306a\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u7279\u5b9a\u306e\u4f7f\u7528\u4f8b\u3084\u8ab2\u984c\u306b\u5bfe\u51e6\u3059\u308b\u305f\u3081\u306b\u3001\u3044\u304f\u3064\u304b\u306e\u4fee\u6b63\u3068\u9069\u5fdc\u304c\u63d0\u6848\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u6ce8\u76ee\u3059\u3079\u304d\u4e9c\u7a2e\u3092\u3044\u304f\u3064\u304b\u793a\u3057\u307e\u3059\u3002<\/p>\n<ol>\n<li><strong>\u62e1\u5f35\u9694\u96e2\u30d5\u30a9\u30ec\u30b9\u30c8:<\/strong> \u5143\u306e\u6982\u5ff5\u3092\u62e1\u5f35\u3057\u3066\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u60c5\u5831\u3092\u8003\u616e\u3059\u308b Isolation Forest \u306e\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u3067\u3001\u6642\u7cfb\u5217\u30c7\u30fc\u30bf\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/li>\n<li><strong>\u5897\u5206\u5206\u96e2\u30d5\u30a9\u30ec\u30b9\u30c8:<\/strong> \u3053\u306e\u30d0\u30ea\u30a2\u30f3\u30c8\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u3001\u30e2\u30c7\u30eb\u5168\u4f53\u3092\u518d\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u65b0\u3057\u3044\u30c7\u30fc\u30bf\u304c\u5229\u7528\u53ef\u80fd\u306b\u306a\u308b\u3068\u6bb5\u968e\u7684\u306b\u30e2\u30c7\u30eb\u3092\u66f4\u65b0\u3067\u304d\u307e\u3059\u3002<\/li>\n<li><strong>\u534a\u76e3\u8996\u578b\u9694\u96e2\u30d5\u30a9\u30ec\u30b9\u30c8:<\/strong> \u3053\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u306f\u3001\u6559\u5e2b\u306a\u3057\u5b66\u7fd2\u539f\u7406\u3068\u6559\u5e2b\u3042\u308a\u5b66\u7fd2\u539f\u7406\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3001\u4e00\u90e8\u306e\u30e9\u30d9\u30eb\u4ed8\u304d\u30c7\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u3066\u5206\u96e2\u30d7\u30ed\u30bb\u30b9\u3092\u30ac\u30a4\u30c9\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<h2>Isolation Forest\u306e\u4f7f\u3044\u65b9\u3068\u5229\u7528\u6642\u306e\u8ab2\u984c\u3068\u305d\u306e\u89e3\u6c7a\u7b56<\/h2>\n<p>Isolation Forest \u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u3055\u307e\u3056\u307e\u306a\u30c9\u30e1\u30a4\u30f3\u3067\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u898b\u3064\u3051\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u7570\u5e38\u691c\u51fa:<\/strong> \u4e0d\u6b63\u53d6\u5f15\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4fb5\u5165\u3001\u6a5f\u5668\u306e\u6545\u969c\u306a\u3069\u3001\u30c7\u30fc\u30bf\u5185\u306e\u5916\u308c\u5024\u3084\u7570\u5e38\u3092\u7279\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u4fb5\u5165\u691c\u77e5:<\/strong> \u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u304a\u3051\u308b\u4e0d\u6b63\u30a2\u30af\u30bb\u30b9\u3084\u4e0d\u5be9\u306a\u6d3b\u52d5\u3092\u691c\u51fa\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u4e0d\u6b63\u884c\u70ba\u306e\u691c\u51fa:<\/strong> \u91d1\u878d\u53d6\u5f15\u306b\u304a\u3051\u308b\u4e0d\u6b63\u884c\u70ba\u306e\u691c\u51fa\u3002<\/li>\n<li><strong>\u54c1\u8cea\u7ba1\u7406\uff1a<\/strong> \u88fd\u9020\u30d7\u30ed\u30bb\u30b9\u3092\u76e3\u8996\u3057\u3066\u4e0d\u826f\u54c1\u3092\u7279\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>Isolation Forest \u306f\u52b9\u679c\u7684\u306a\u7570\u5e38\u691c\u51fa\u65b9\u6cd5\u3067\u3059\u304c\u3001\u3044\u304f\u3064\u304b\u306e\u8ab2\u984c\u306b\u76f4\u9762\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u9ad8\u6b21\u5143\u30c7\u30fc\u30bf:<\/strong> \u30c7\u30fc\u30bf\u306e\u6b21\u5143\u304c\u5897\u52a0\u3059\u308b\u3068\u3001\u5206\u96e2\u30d7\u30ed\u30bb\u30b9\u306e\u52b9\u7387\u304c\u4f4e\u4e0b\u3057\u307e\u3059\u3002\u6b21\u5143\u524a\u6e1b\u6280\u8853\u3092\u4f7f\u7528\u3057\u3066\u3001\u3053\u306e\u554f\u984c\u3092\u8efd\u6e1b\u3067\u304d\u307e\u3059\u3002<\/li>\n<li><strong>\u30c7\u30fc\u30bf\u306e\u4e0d\u5747\u8861:<\/strong> \u901a\u5e38\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3068\u6bd4\u8f03\u3057\u3066\u7570\u5e38\u304c\u307e\u308c\u306a\u5834\u5408\u3001Isolation Forest \u306f\u305d\u308c\u3089\u3092\u52b9\u679c\u7684\u306b\u9694\u96e2\u3059\u308b\u306e\u306b\u82e6\u52b4\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u30aa\u30fc\u30d0\u30fc\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3084\u7570\u5e38\u3057\u304d\u3044\u5024\u306e\u8abf\u6574\u306a\u3069\u306e\u624b\u6cd5\u306b\u3088\u308a\u3001\u3053\u306e\u554f\u984c\u306b\u5bfe\u51e6\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ul>\n<h2>\u4e3b\u306a\u7279\u5fb4\u3068\u305d\u306e\u4ed6\u306e\u985e\u4f3c\u7528\u8a9e\u3068\u306e\u6bd4\u8f03\u3092\u8868\u3068\u30ea\u30b9\u30c8\u306e\u5f62\u5f0f\u3067\u793a\u3057\u307e\u3059\u3002<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u7279\u6027<\/th>\n<th>\u5b64\u7acb\u306e\u68ee<\/th>\n<th>1\u30af\u30e9\u30b9\u306eSVM<\/th>\n<th>\u5c40\u6240\u5916\u308c\u5024\u4fc2\u6570<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u6559\u5e2b\u3042\u308a\u5b66\u7fd2?<\/td>\n<td>\u3044\u3044\u3048<\/td>\n<td>\u3044\u3044\u3048<\/td>\n<td>\u3044\u3044\u3048<\/td>\n<\/tr>\n<tr>\n<td>\u30c7\u30fc\u30bf\u914d\u4fe1<\/td>\n<td>\u3069\u308c\u3067\u3082<\/td>\n<td>\u3069\u308c\u3067\u3082<\/td>\n<td>\u307b\u3068\u3093\u3069\u304c\u30ac\u30a6\u30b9<\/td>\n<\/tr>\n<tr>\n<td>\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3<\/td>\n<td>\u9ad8\u3044<\/td>\n<td>\u4e2d\uff5e\u9ad8<\/td>\n<td>\u4e2d\uff5e\u9ad8<\/td>\n<\/tr>\n<tr>\n<td>\u30d1\u30e9\u30e1\u30fc\u30bf\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0<\/td>\n<td>\u6700\u5c0f\u9650<\/td>\n<td>\u9069\u5ea6<\/td>\n<td>\u6700\u5c0f\u9650<\/td>\n<\/tr>\n<tr>\n<td>\u7570\u5e38\u5024\u306e\u611f\u5ea6<\/td>\n<td>\u4f4e\u3044<\/td>\n<td>\u9ad8\u3044<\/td>\n<td>\u9069\u5ea6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Isolation Forest\u306b\u95a2\u3059\u308b\u672a\u6765\u306e\u8996\u70b9\u3068\u6280\u8853<\/h2>\n<p>Isolation Forest \u306f\u3001\u305d\u306e\u52b9\u7387\u6027\u3068\u6709\u52b9\u6027\u304c\u5927\u898f\u6a21\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u9069\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u4eca\u5f8c\u3082\u7570\u5e38\u691c\u51fa\u306e\u305f\u3081\u306e\u8cb4\u91cd\u306a\u30c4\u30fc\u30eb\u3067\u3042\u308a\u7d9a\u3051\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u5c06\u6765\u306e\u958b\u767a\u306b\u306f\u4ee5\u4e0b\u304c\u542b\u307e\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u4e26\u5217\u5316:<\/strong> \u4e26\u5217\u51e6\u7406\u3068\u5206\u6563\u30b3\u30f3\u30d4\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u6280\u8853\u3092\u5229\u7528\u3057\u3066\u3001\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3\u3092\u3055\u3089\u306b\u5f37\u5316\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u30cf\u30a4\u30d6\u30ea\u30c3\u30c9\u30a2\u30d7\u30ed\u30fc\u30c1:<\/strong> Isolation Forest \u3092\u4ed6\u306e\u7570\u5e38\u691c\u51fa\u65b9\u6cd5\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u3001\u3088\u308a\u5805\u7262\u3067\u6b63\u78ba\u306a\u30e2\u30c7\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u89e3\u91c8\u53ef\u80fd\u6027:<\/strong> Isolation Forest \u306e\u89e3\u91c8\u53ef\u80fd\u6027\u3092\u9ad8\u3081\u3001\u7570\u5e38\u30b9\u30b3\u30a2\u306e\u80cc\u5f8c\u306b\u3042\u308b\u7406\u7531\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306e\u53d6\u308a\u7d44\u307f\u3002<\/li>\n<\/ul>\n<h2>\u30d7\u30ed\u30ad\u30b7 \u30b5\u30fc\u30d0\u30fc\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u3001\u307e\u305f\u306f Isolation Forest \u306b\u95a2\u9023\u4ed8\u3051\u308b\u65b9\u6cd5<\/h2>\n<p>\u30d7\u30ed\u30ad\u30b7 \u30b5\u30fc\u30d0\u30fc\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u306e\u30d7\u30e9\u30a4\u30d0\u30b7\u30fc\u3068\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u78ba\u4fdd\u3059\u308b\u4e0a\u3067\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002 Isolation Forest \u306e\u7570\u5e38\u691c\u51fa\u6a5f\u80fd\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001OneProxy \u306a\u3069\u306e\u30d7\u30ed\u30ad\u30b7 \u30b5\u30fc\u30d0\u30fc \u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u3092\u5f37\u5316\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\uff1a<\/p>\n<ul>\n<li><strong>\u30a2\u30af\u30bb\u30b9\u30ed\u30b0\u306e\u7570\u5e38\u691c\u51fa:<\/strong> Isolation Forest \u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30a2\u30af\u30bb\u30b9 \u30ed\u30b0\u3092\u5206\u6790\u3057\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u3092\u56de\u907f\u3057\u3088\u3046\u3068\u3059\u308b\u4e0d\u5be9\u306a\u30a2\u30af\u30c6\u30a3\u30d3\u30c6\u30a3\u3084\u60aa\u610f\u306e\u3042\u308b\u30a2\u30af\u30c6\u30a3\u30d3\u30c6\u30a3\u3092\u7279\u5b9a\u3067\u304d\u307e\u3059\u3002<\/li>\n<li><strong>\u30d7\u30ed\u30ad\u30b7\u3068 VPN \u306e\u8b58\u5225:<\/strong> Isolation Forest \u306f\u3001\u30d7\u30ed\u30ad\u30b7\u3084 VPN \u3092\u4f7f\u7528\u3057\u3066 ID \u3092\u30de\u30b9\u30af\u3059\u308b\u6f5c\u5728\u7684\u306a\u653b\u6483\u8005\u304b\u3089\u6b63\u5f53\u306a\u30e6\u30fc\u30b6\u30fc\u3092\u533a\u5225\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/li>\n<li><strong>\u8105\u5a01\u306e\u691c\u51fa\u3068\u9632\u6b62:<\/strong> Isolation Forest \u3092\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u3067\u63a1\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30d7\u30ed\u30ad\u30b7 \u30b5\u30fc\u30d0\u30fc\u306f DDoS \u653b\u6483\u3084\u30d6\u30eb\u30fc\u30c8 \u30d5\u30a9\u30fc\u30b9\u653b\u6483\u306a\u3069\u306e\u6f5c\u5728\u7684\u306a\u8105\u5a01\u3092\u691c\u51fa\u3057\u3001\u9632\u6b62\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ul>\n<h2>\u95a2\u9023\u30ea\u30f3\u30af<\/h2>\n<p>Isolation Forest \u306e\u8a73\u7d30\u306b\u3064\u3044\u3066\u306f\u3001\u6b21\u306e\u30ea\u30bd\u30fc\u30b9\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<ol>\n<li><a href=\"https:\/\/cs.nju.edu.cn\/zhouzh\/zhouzh.files\/publication\/icdm08b.pdf\" target=\"_new\" rel=\"noopener nofollow\">\u5206\u96e2\u30d9\u30fc\u30b9\u306e\u7570\u5e38\u691c\u51fa (\u7814\u7a76\u8ad6\u6587)<\/a><\/li>\n<li><a href=\"https:\/\/scikit-learn.org\/stable\/modules\/generated\/sklearn.ensemble.IsolationForest.html\" target=\"_new\" rel=\"noopener nofollow\">Isolation Forest \u306b\u95a2\u3059\u308b Scikit-Learn \u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/a><\/li>\n<li><a href=\"https:\/\/towardsdatascience.com\/outlier-detection-with-isolation-forest-3d190448d45e\" target=\"_new\" rel=\"noopener nofollow\">\u30c7\u30fc\u30bf \u30b5\u30a4\u30a8\u30f3\u30b9\u306b\u5411\u3051\u3066 \u2013 Isolation Forest \u306e\u6982\u8981<\/a><\/li>\n<li><a href=\"https:\/\/oneproxy.pro\/jp\/blog\/isolation-forest-enhanced-security\/\" target=\"_new\" rel=\"noopener\">OneProxy \u30d6\u30ed\u30b0 \u2013 \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u5f37\u5316\u3059\u308b\u305f\u3081\u306e\u5206\u96e2\u30d5\u30a9\u30ec\u30b9\u30c8\u306e\u4f7f\u7528<\/a><\/li>\n<\/ol>\n<p>\u7d50\u8ad6\u3068\u3057\u3066\u3001Isolation Forest \u306f\u3001\u5927\u898f\u6a21\u306a\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u5185\u306e\u5916\u308c\u5024\u3068\u7570\u5e38\u3092\u7279\u5b9a\u3059\u308b\u305f\u3081\u306e\u65ac\u65b0\u3067\u52b9\u7387\u7684\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u5c0e\u5165\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u7570\u5e38\u691c\u51fa\u306b\u9769\u547d\u3092\u3082\u305f\u3089\u3057\u307e\u3057\u305f\u3002\u305d\u306e\u591a\u7528\u9014\u6027\u3001\u62e1\u5f35\u6027\u3001\u304a\u3088\u3073\u9ad8\u6b21\u5143\u30c7\u30fc\u30bf\u306e\u51e6\u7406\u80fd\u529b\u306b\u3088\u308a\u3001\u30d7\u30ed\u30ad\u30b7 \u30b5\u30fc\u30d0\u30fc\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u542b\u3080\u3055\u307e\u3056\u307e\u306a\u30c9\u30e1\u30a4\u30f3\u3067\u8cb4\u91cd\u306a\u30c4\u30fc\u30eb\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u30c6\u30af\u30ce\u30ed\u30b8\u30fc\u304c\u9032\u5316\u3057\u7d9a\u3051\u308b\u4e2d\u3001Isolation Forest \u306f\u4eca\u5f8c\u3082\u7570\u5e38\u691c\u51fa\u306e\u5206\u91ce\u3067\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u3001\u3055\u307e\u3056\u307e\u306a\u696d\u754c\u306e\u30d7\u30e9\u30a4\u30d0\u30b7\u30fc\u3068\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u306e\u9032\u6b69\u3092\u63a8\u9032\u3059\u308b\u3068\u8003\u3048\u3089\u308c\u307e\u3059\u3002<\/p>","protected":false},"featured_media":505895,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-477726","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Isolation Forest: An Innovative Approach to Anomaly Detection<\/mark>","faq_items":[{"question":"What is Isolation Forest and how does it work?","answer":"Isolation Forest is a machine learning algorithm used for anomaly detection. Unlike traditional methods, Isolation Forest isolates anomalies directly by recursively partitioning data points into subsets until each data point is in its own tree leaf. Shorter paths to isolation indicate anomalies, while longer paths represent normal instances."},{"question":"When was Isolation Forest introduced?","answer":"Isolation Forest was first introduced in 2008 by Fei Tony Liu, Kai Ming Ting, and Zhi-Hua Zhou in their paper \"Isolation-Based Anomaly Detection.\""},{"question":"What are the key features of Isolation Forest?","answer":"Isolation Forest is known for its efficiency, scalability, and robustness to outliers. It requires minimal parameter tuning and doesn't assume any specific data distribution."},{"question":"What are the types of Isolation Forest?","answer":"There are no distinct types, but some adaptations include Extended Isolation Forest, Incremental Isolation Forest, and Semi-Supervised Isolation Forest."},{"question":"How is Isolation Forest used for anomaly detection?","answer":"Isolation Forest finds applications in anomaly detection, intrusion detection, fraud detection, and quality control. It identifies outliers and anomalies in various datasets."},{"question":"What challenges might Isolation Forest face?","answer":"Isolation Forest might face challenges with high-dimensional data and data imbalance. Techniques like dimensionality reduction and threshold adjustments can address these issues."},{"question":"How does Isolation Forest compare to other anomaly detection methods?","answer":"Isolation Forest outperforms One-Class SVM and Local Outlier Factor in terms of efficiency, scalability, and outlier sensitivity."},{"question":"What is the future outlook for Isolation Forest?","answer":"The future of Isolation Forest may involve parallelization, hybrid approaches, and efforts to enhance interpretability for even better anomaly detection."},{"question":"How can proxy servers benefit from Isolation Forest?","answer":"Proxy servers can enhance security measures using Isolation Forest for anomaly detection in access logs, identifying proxies and VPNs, and preventing potential threats like DDoS attacks."}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/jp\/wp-json\/wp\/v2\/wiki\/477726","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/jp\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/jp\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":1,"href":"https:\/\/oneproxy.pro\/jp\/wp-json\/wp\/v2\/wiki\/477726\/revisions"}],"predecessor-version":[{"id":505896,"href":"https:\/\/oneproxy.pro\/jp\/wp-json\/wp\/v2\/wiki\/477726\/revisions\/505896"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/jp\/wp-json\/wp\/v2\/media\/505895"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/jp\/wp-json\/wp\/v2\/media?parent=477726"}],"curies":[{"name":"\u3046\u30fc\u3093","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}