Isolation Forest\u306f\u3001\u30c7\u30fc\u30bf\u306e\u4e2d\u3067\u300c\u6570\u304c\u5c11\u306a\u304f\u3001\u5468\u308a\u3068\u6027\u8cea\u304c\u9055\u3046\u70b9\uff08\u7570\u5e38\uff09\u300d\u306f\u3001\u30e9\u30f3\u30c0\u30e0\u306b\u5206\u5272\u3057\u3066\u3044\u304f\u3068\u5c11\u306a\u3044\u56de\u6570\u3067\u533a\u5225\u3067\u304d\u308b\u3001\u3068\u3044\u3046\u76f4\u611f\u306b\u57fa\u3065\u304f\u7570\u5e38\u691c\u77e5\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3067\u3042\u308b\u3002\u6728\u69cb\u9020\uff08\u30a2\u30a4\u30bd\u30ec\u30fc\u30b7\u30e7\u30f3\u30c4\u30ea\u30fc\uff09\u3092\u591a\u6570\u4f5c\u308a\u3001\u5404\u30c7\u30fc\u30bf\u70b9\u304c\u6839\u304b\u3089\u8449\u307e\u3067\u5230\u9054\u3059\u308b\u307e\u3067\u306e\u300c\u7d4c\u8def\u306e\u9577\u3055\uff08\u30d1\u30b9\u9577\uff09\u300d\u3092\u5e73\u5747\u3059\u308b\u3068\u3001\u7570\u5e38\u306f\u77ed\u304f\u3001\u901a\u5e38\u306f\u9577\u304f\u306a\u308a\u3084\u3059\u3044\u3068\u3044\u3046\u6027\u8cea\u3092\u305d\u306e\u307e\u307e\u30b9\u30b3\u30a2\u5316\u3057\u3066\u5229\u7528\u3059\u308b\u3002\u5bc6\u5ea6\u63a8\u5b9a\u3084\u78ba\u7387\u30e2\u30c7\u30eb\u5316\u3092\u884c\u308f\u305a\u3001\u30e9\u30f3\u30c0\u30e0\u5206\u5272\u306e\u7d50\u679c\u5f97\u3089\u308c\u308b\u30d1\u30b9\u9577\u3060\u3051\u3067\u7570\u5e38\u5ea6\u3092\u5224\u5b9a\u3059\u308b\u70b9\u304c\u7279\u5fb4\u3067\u3001\u9ad8\u6b21\u5143\u30fb\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306b\u3082\u7dda\u5f62\u6642\u9593\u30fb\u4f4e\u30e1\u30e2\u30ea\u3067\u9069\u7528\u3067\u304d\u308b\u306e\u304c\u5229\u70b9\u3068\u3055\u308c\u3066\u3044\u308b\u3002[1][2][3]\n\n\n\n
\u4ed5\u7d44\u307f\u3092\u3084\u3055\u3057\u304f\u8a00\u3044\u63db\u3048\u308b\u3068\u3001\u6b21\u306e\u901a\u308a\u3067\u3042\u308b\u3002- \u30e9\u30f3\u30c0\u30e0\u306b\u7279\u5fb4\u30921\u3064\u9078\u3073\u3001\u305d\u306e\u7279\u5fb4\u306e\u6700\u5c0f\u5024\u3068\u6700\u5927\u5024\u306e\u9593\u304b\u3089\u30e9\u30f3\u30c0\u30e0\u306b\u3057\u304d\u3044\u5024\u3092\u9078\u3093\u3067\u3001\u30c7\u30fc\u30bf\u3092\u4e8c\u5206\u5272\u3059\u308b\u3002- \u3053\u306e\u5206\u5272\u3092\u518d\u5e30\u7684\u306b\u7e70\u308a\u8fd4\u3057\u3066\u4e8c\u5206\u6728\uff08\u30a2\u30a4\u30bd\u30ec\u30fc\u30b7\u30e7\u30f3\u30c4\u30ea\u30fc\uff09\u3092\u6210\u9577\u3055\u305b\u3001\u70b9\u304c\u8449\u306b\u5230\u9054\u3057\u305f\u6df1\u3055\uff08\u30d1\u30b9\u9577\uff09\u3092\u8a18\u9332\u3059\u308b\u3002- \u540c\u3058\u64cd\u4f5c\u3092\u591a\u6570\u306e\u30c4\u30ea\u30fc\uff08\u30d5\u30a9\u30ec\u30b9\u30c8\uff09\u3067\u884c\u3044\u3001\u5404\u70b9\u306e\u5e73\u5747\u30d1\u30b9\u9577\u3092\u7570\u5e38\u5ea6\u306e\u57fa\u790e\u306b\u3059\u308b\uff08\u77ed\u3044\u307b\u3069\u7570\u5e38\u3089\u3057\u3044\uff09\u3002\u7570\u5e38\u30b9\u30b3\u30a2\u306e\u7406\u8ad6\u5f0f\u306f\u3001\u4e8c\u5206\u63a2\u7d22\u6728\u306b\u304a\u3051\u308b\u5e73\u5747\u5931\u6557\u63a2\u7d22\u9577\u3068\u5bfe\u5fdc\u3065\u3051\u3089\u308c\u3066\u304a\u308a\u3001\u5e73\u5747\u30d1\u30b9\u9577E(h(x))\u3092\u9069\u5207\u306b\u6b63\u898f\u5316\u3057\u305f\u6307\u6a19s(x,m)=2^{-E(h(x))\/c(m)}\u304c\u5e83\u304f\u7d39\u4ecb\u3055\u308c\u3066\u3044\u308b\uff08s\u304c1\u306b\u8fd1\u3044\u307b\u3069\u7570\u5e38\u3089\u3057\u3044\uff09\u3002[4][2][3][5][1]\n\n\n\n
\u4f7f\u3044\u65b9\u306e\u57fa\u672c\u306f\u3001\u8a13\u7df4\u30c7\u30fc\u30bf\u3067\u68ee\u3092\u4f5c\u308a\u3001\u5404\u70b9\u306e\u30b9\u30b3\u30a2\u3092\u8a08\u7b97\u3057\u3066\u300c\u3069\u3053\u304b\u3089\u4e0a\u3092\u7570\u5e38\u3068\u3059\u308b\u304b\u300d\u306e\u3057\u304d\u3044\u5024\u3092\u6c7a\u3081\u308b\u3001\u3068\u3044\u3046\u6d41\u308c\u3067\u3042\u308b\u3002\u5b9f\u88c5\u3068\u3057\u3066\u4e00\u822c\u7684\u306a\u30e9\u30a4\u30d6\u30e9\u30ea\u306f\u3001- n_estimators\uff08\u6728\u306e\u672c\u6570\u3001\u65e2\u5b9a100\u7a0b\u5ea6\uff09\u3001- max_samples\uff08\u5404\u6728\u306e\u5b66\u7fd2\u306b\u4f7f\u3046\u30b5\u30f3\u30d7\u30eb\u6570\u3001\u65e2\u5b9a\u306fmin(256, n_samples)\uff09\u3001- contamination\uff08\u7570\u5e38\u306e\u60f3\u5b9a\u5272\u5408\u3002'auto'\u3067\u539f\u8ad6\u6587\u306b\u6e96\u3058\u305f\u3057\u304d\u3044\u5024\u3001\u307e\u305f\u306f0<\u5272\u5408\u22640.5\u3067\u660e\u793a\u8a2d\u5b9a\uff09\u3001- max_features\uff08\u5404\u6728\u3067\u4f7f\u7528\u3059\u308b\u7279\u5fb4\u6570\u306e\u5272\u5408\u3084\u672c\u6570\uff09\u3001\u306a\u3069\u3092\u5099\u3048\u308b\u3002max_samples\u3092256\u7a0b\u5ea6\u306b\u6291\u3048\u308b\u65e2\u5b9a\u306f\u3001\u5c11\u306a\u3044\u6a19\u672c\u3067\u6728\u3092\u4f5c\u3063\u305f\u65b9\u304c\u7570\u5e38\u3092\u7d20\u65e9\u304f\u5b64\u7acb\u3055\u305b\u3084\u3059\u3044\u3068\u3044\u3046\u7d4c\u9a13\u7684\u5229\u70b9\u306b\u57fa\u3065\u304d\u3001\u53ce\u675f\u3084\u8a08\u7b97\u91cf\u306e\u70b9\u3067\u5b9f\u52d9\u306b\u9069\u3059\u308b\u3053\u3068\u304c\u89e3\u8aac\u3055\u308c\u3066\u3044\u308b\u3002contamination\u306f\u3057\u304d\u3044\u5024\u6c7a\u5b9a\u306b\u76f4\u7d50\u3057\u3001\u5024\u3092\u4e0a\u3052\u308c\u3070\u7570\u5e38\u5224\u5b9a\u304c\u5897\u3048\u3001\u4e0b\u3052\u308c\u3070\u53b3\u3057\u304f\u306a\u308b\u305f\u3081\u3001\u30c7\u30fc\u30bf\u3068\u904b\u7528\u76ee\u7684\u306b\u5408\u308f\u305b\u305f\u8abf\u6574\u304c\u91cd\u8981\u3067\u3042\u308b\u3002[2][6][7][5][1]\n\n\n\n
\u9577\u6240\u3068\u5411\u3044\u3066\u3044\u308b\u5834\u9762\u3092\u6574\u7406\u3059\u308b\u3002- \u30b9\u30b1\u30fc\u30eb\u3068\u6b21\u5143\u306b\u6bd4\u8f03\u7684\u5f37\u304f\u3001\u5927\u898f\u6a21\u30fb\u9ad8\u6b21\u5143\u3067\u3082\u9ad8\u901f\u306b\u52d5\u304f\uff08\u30e9\u30f3\u30c0\u30e0\u5206\u5272\u30fb\u7dda\u5f62\u6642\u9593\u30fb\u4f4e\u30e1\u30e2\u30ea\uff09\u3002- \u6b63\u5e38\u5206\u5e03\u306e\u53b3\u5bc6\u306a\u30e2\u30c7\u30ea\u30f3\u30b0\u3092\u305b\u305a\u3001\u30d1\u30b9\u9577\u3060\u3051\u3067\u7570\u5e38\u5ea6\u3092\u51fa\u305b\u308b\u305f\u3081\u3001\u5206\u5e03\u4eee\u5b9a\u306b\u7e1b\u3089\u308c\u306b\u304f\u3044\u3002- \u6559\u5e2b\u306a\u3057\u3067\u4f7f\u3048\u308b\u305f\u3081\u3001\u30e9\u30d9\u30eb\u304c\u5c11\u306a\u3044\u73fe\u5834\u306e\u521d\u671f\u30b9\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u306b\u597d\u9069\u3067\u3042\u308b\u3002\u3068\u304f\u306b\u3001\u6545\u969c\u304c\u7a00\u3067\u591a\u69d8\u3001\u6b63\u5e38\u306f\u8c4a\u5bcc\u3068\u3044\u3046\u73fe\u5834\u4e8b\u60c5\u306b\u5408\u3044\u3084\u3059\u3044\u3002[8][6][1][2]\n\n\n\n
\u6ce8\u610f\u70b9\u3068\u9650\u754c\u3082\u660e\u78ba\u306b\u3057\u3066\u304a\u304f\u3002- contamination\u306e\u8a2d\u5b9a\u306b\u654f\u611f\u3067\u3001\u904e\u5927\u30fb\u904e\u5c0f\u3067\u8aa4\u8b66\u5831\uff0f\u898b\u9003\u3057\u306e\u30d0\u30e9\u30f3\u30b9\u304c\u5d29\u308c\u3084\u3059\u3044\uff08'auto'\u8d77\u70b9\u3067\u691c\u8a3c\u3057\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u660e\u793a\u5024\u3078\u5fae\u8abf\u6574\uff09\u3002- \u6b63\u5e38\u304c\u8907\u6570\u306e\u5bc6\u306a\u30af\u30e9\u30b9\u30bf\u30fc\u3092\u6210\u3059\u5834\u5408\u3084\u3001\u7570\u5e38\u304c\u6b63\u5e38\u306b\u8fd1\u3044\u300c\u5bc6\u306a\u584a\u300d\u3068\u3057\u3066\u73fe\u308c\u308b\u5834\u5408\u306b\u306f\u3001\u30d1\u30b9\u9577\u3060\u3051\u3067\u306f\u5206\u96e2\u304c\u96e3\u3057\u3044\u5c40\u9762\u304c\u3042\u308b\uff08\u624b\u6cd5\u62e1\u5f35\u3084\u7279\u5fb4\u8a2d\u8a08\u306e\u5de5\u592b\u304c\u5fc5\u8981\uff09\u3002- \u5b9f\u88c5\u306b\u3088\u308a\u30b9\u30b3\u30a2\u6b63\u898f\u5316\u3084\u4e88\u6e2c\u51fa\u529b\u306e\u6271\u3044\u304c\u7570\u306a\u308b\u3053\u3068\u304c\u3042\u308b\u305f\u3081\u3001\u63a1\u7528\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u4ed5\u69d8\u3092\u78ba\u8a8d\u3059\u308b\uff08\u4f8b\uff1aH2O\u306f\u5e73\u5747\u30d1\u30b9\u9577\u7531\u6765\u306e\u30b9\u30b3\u30a2\u3067\u3057\u304d\u3044\u5024\u3092\u7f6e\u304d\u3001BST\u7531\u6765\u306e\u5f0f\u3092\u305d\u306e\u307e\u307e\u306f\u7528\u3044\u306a\u3044\uff09\u3002[6][9][7][1][4][2]\n\n\n\n
\u30d1\u30e9\u30e1\u30fc\u30bf\u8a2d\u8a08\u306e\u5b9f\u52d9\u6307\u91dd\u306f\u6b21\u306e\u901a\u308a\u3002- n_estimators\u306f100\u524d\u5f8c\u304b\u3089\u958b\u59cb\u3057\u3001\u30b9\u30b3\u30a2\u306e\u5b89\u5b9a\u5ea6\uff08\u5206\u6563\uff09\u3068\u51e6\u7406\u6642\u9593\u3092\u898b\u3066\u8abf\u6574\u3059\u308b\u3002- max_samples\u306f\u65e2\u5b9a\u306emin(256, n_samples)\u3092\u8d77\u70b9\u306b\u3001\u5c0f\u3055\u3059\u304e\u3066\u6728\u304c\u504f\u3089\u306a\u3044\u304b\u3001\u9006\u306b\u5927\u304d\u3059\u304e\u3066\u8a08\u7b97\u304c\u91cd\u304f\u306a\u3089\u306a\u3044\u304b\u3092\u691c\u8a3c\u3059\u308b\uff08\u5c0f\u6a19\u672c\u6642\u306f\u52b9\u679c\u3092\u78ba\u8a8d\uff09\u3002- contamination\u306f\u691c\u8a3c\u7528\u30c7\u30fc\u30bf\u3067PR\u66f2\u7dda\u3084\u518d\u73fe\u7387\u30fb\u9069\u5408\u7387\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u898b\u306a\u304c\u3089\u6c7a\u3081\u3001\u904b\u7528\u306e\u8a31\u5bb9\u5ea6\u306b\u5408\u308f\u305b\u3066\u518d\u73fe\u7387\u5bc4\u308a\uff0f\u9069\u5408\u7387\u5bc4\u308a\u3092\u9078\u3076\u3002- max_features\u306f1.0\uff08\u5168\u7279\u5fb4\uff09\u304b\u3089\u958b\u59cb\u3057\u3001\u5197\u9577\u6b21\u5143\u304c\u591a\u3044\u5834\u5408\u306f\u6bd4\u7387\u3092\u4e0b\u3052\u305f\u30b5\u30d6\u30b9\u30da\u30fc\u30b9\u5b66\u7fd2\u3067\u30ed\u30d0\u30b9\u30c8\u6027\u3092\u8a66\u3059\u3002[7][5][2][6]\n\n\n\n
\u6545\u969c\u4e88\u77e5\u3078\u306e\u843d\u3068\u3057\u8fbc\u307f\u3067\u306f\u3001\u7279\u5fb4\u91cf\u8a2d\u8a08\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u304c\u8981\u3067\u3042\u308b\u3002RMS\u3001\u77ed\u6642\u9593\u30a8\u30cd\u30eb\u30ae\u30fc\u3001\u30bc\u30ed\u4ea4\u5dee\u7387\u3001\u30b9\u30da\u30af\u30c8\u30eb\u91cd\u5fc3\u3001\u30d0\u30f3\u30c9\u30a8\u30cd\u30eb\u30ae\u30fc\u3001\u30d4\u30fc\u30af\u30c8\u30c3\u30d7N\u306a\u3069\u3001\u6642\u9593\u9818\u57df\u30fb\u5468\u6ce2\u6570\u9818\u57df\u306e\u4ee3\u8868\u6307\u6a19\u3092\u6574\u3048\u3001\u6b63\u898f\u5316\u30fb\u6a19\u6e96\u5316\u3067\u30b9\u30b1\u30fc\u30eb\u3092\u305d\u308d\u3048\u308b\u3002\u305d\u306e\u4e0a\u3067Isolation Forest\u3092\u9069\u7528\u3057\u3001- \u7570\u5e38\u30b9\u30b3\u30a2\u306e\u4e0a\u4f4d\u304b\u3089\u30a4\u30d9\u30f3\u30c8\u5019\u88dc\u3092\u62bd\u51fa\u3001- \u30b9\u30b3\u30a2\u306e\u6642\u7cfb\u5217\u30c8\u30ec\u30f3\u30c9\u3067\u57fa\u6e96\u30ec\u30f3\u30b8\u304b\u3089\u306e\u9038\u8131\u3092\u76e3\u8996\u3001- \u3057\u304d\u3044\u5024\u306f\u691c\u8a3c\u30c7\u30fc\u30bf\u306ePR\u6307\u6a19\u3067\u6c7a\u5b9a\u3001\u3068\u3044\u3046\u4e8c\u6bb5\u69cb\u3048\uff08\u524d\u6bb5\u30b9\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u2192\u5f8c\u6bb5\u306e\u8a73\u7d30\u89e3\u6790\uff09\u306b\u3059\u308b\u3068\u3001\u8aa4\u8b66\u5831\u3068\u898b\u9003\u3057\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u53d6\u308a\u3084\u3059\u3044\u3002\u5b9f\u52d9\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u3082\u3001\u30d1\u30b9\u9577\u306b\u57fa\u3065\u304f\u30b9\u30b3\u30a2\u304c\u300c\u901a\u5e38\u3089\u3057\u3055\uff0f\u7570\u5e38\u3089\u3057\u3055\u300d\u3092\u9023\u7d9a\u5024\u3067\u8fd4\u3057\u3001\u3057\u304d\u3044\u5024\u3067\u6700\u7d42\u5224\u65ad\u3059\u308b\u6d41\u308c\u304c\u793a\u3055\u308c\u3066\u3044\u308b\u3002[3][10][2][6]\n\n\n\n
\u904b\u7528\u6642\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u6319\u3052\u308b\u3002- \u30c7\u30fc\u30bf\u5206\u5272\u306f\u5c64\u5316\u3084\u6642\u7cfb\u5217\u5206\u5272\u3067\u30ea\u30fc\u30af\u3092\u9632\u304e\u3001\u524d\u51e6\u7406\uff08\u6a19\u6e96\u5316\u306a\u3069\uff09\u306f\u5fc5\u305a\u8a13\u7df4\u7d71\u8a08\u3067\u5b66\u3093\u3067\u691c\u8a3c\u30fb\u672c\u756a\u306b\u9069\u7528\u3059\u308b\uff08\u8a55\u4fa1\u306e\u516c\u6b63\u6027\u78ba\u4fdd\uff09\u3002- contamination\u3084\u3057\u304d\u3044\u5024\u306f\u56fa\u5b9a\u305b\u305a\u3001\u5b63\u7bc0\u30fb\u8ca0\u8377\u30fb\u30e9\u30a4\u30f3\u5909\u66f4\u3067\u518d\u70b9\u691c\u3059\u308b\uff08\u30c9\u30ea\u30d5\u30c8\u5bfe\u7b56\uff09\u3002- \u30b9\u30b3\u30a2\u4e0a\u4f4d\u306e\u30b5\u30f3\u30d7\u30eb\u306f\u3001\u30b9\u30da\u30af\u30c8\u30ed\u30b0\u30e9\u30e0\u3084\u30d4\u30fc\u30af\u8868\u3068\u4f75\u8aad\u3057\u3066\u6839\u62e0\u3092\u53ef\u8996\u5316\u3057\u3001\u73fe\u5834\u8aac\u660e\u53ef\u80fd\u6027\u3092\u9ad8\u3081\u308b\u3002- \u4ed6\u624b\u6cd5\u3068\u306e\u88dc\u5b8c\uff08\u4f8b\uff1aIsolation Forest\u306e\u5019\u88dc\u2192\u5468\u6ce2\u6570\u30d4\u30fc\u30af\u691c\u51fa\u3084\u5074\u5e2f\u57df\u6bd4\u3067\u7cbe\u67fb\uff09\u3067\u8aa4\u8b66\u5831\u3092\u6291\u3048\u308b\u3002[2][6][3]\n\n\n\n
\u7406\u8ad6\u9762\u306e\u88dc\u8db3\u3068\u3057\u3066\u3001\u5e73\u5747\u30d1\u30b9\u9577\u306e\u6b63\u898f\u5316\u306b\u73fe\u308c\u308bc(m)\u306f\u8abf\u548c\u6570H\u306e\u8fd1\u4f3c\uff08H(i)\u2248ln(i)+\u03b3\uff09\u3092\u7528\u3044\u3066\u8a55\u4fa1\u3055\u308c\u3001s(x,m)=2^{-E(h(x))\/c(m)}\u304c\u6a19\u6e96\u7684\u306b\u7528\u3044\u3089\u308c\u308b\uff08s\u304c1\u306b\u8fd1\u3044\u3068\u5f37\u3044\u7570\u5e38\u30010.5\u4ed8\u8fd1\u306f\u6b63\u5e38\u76ee\u5b89\uff09\u3002\u307e\u305f\u3001\u62e1\u5f35\u624b\u6cd5\u3068\u3057\u3066\u3001\u7279\u5fb4\u306e\u30b5\u30d6\u30b9\u30da\u30fc\u30b9\u9078\u629e\u3084\u30af\u30e9\u30b9\u30bf\u3092\u610f\u8b58\u3057\u305f\u6d3e\u751f\uff08SCiForest\u306a\u3069\uff09\u3082\u5831\u544a\u3055\u308c\u3066\u304a\u308a\u3001\u30af\u30e9\u30b9\u30bf\u30fc\u5316\u3057\u305f\u7570\u5e38\u3078\u306e\u611f\u5ea6\u6539\u5584\u304c\u56f3\u3089\u308c\u3066\u3044\u308b\u3002[5][1][4]\n\n\n\n
\u6700\u5f8c\u306b\u3001\u5c0e\u5165\u306e\u6700\u5c0f\u624b\u9806\u3092\u307e\u3068\u3081\u308b\u30021) \u7279\u5fb4\u91cf\u3092\u4f5c\u6210\u3057\u3001\u6b20\u640d\u51e6\u7406\u3068\u30b9\u30b1\u30fc\u30ea\u30f3\u30b0\u3092\u8a13\u7df4\u30c7\u30fc\u30bf\u57fa\u6e96\u3067\u5b9f\u65bd\u3059\u308b\u30022) Isolation Forest\u3092n_estimators=100\u3001max_samples='auto'\u3001contamination='auto'\u304b\u3089\u958b\u59cb\u3057\u3066\u5b66\u7fd2\u3059\u308b\u30023) \u691c\u8a3c\u30c7\u30fc\u30bf\u3067\u30b9\u30b3\u30a2\u3092\u8a55\u4fa1\u3057\u3001PR\u66f2\u7dda\u30fb\u518d\u73fe\u7387\u30fb\u9069\u5408\u7387\u306e\u30d0\u30e9\u30f3\u30b9\u3067contamination\uff08\u307e\u305f\u306f\u3057\u304d\u3044\u5024\uff09\u3092\u8abf\u6574\u3059\u308b\u30024) \u30b9\u30b3\u30a2\u4e0a\u4f4d\u3092\u4eba\u30fb\u4e0a\u4f4d\u89e3\u6790\u3067\u70b9\u691c\u3057\u3001\u3057\u304d\u3044\u5024\u306e\u59a5\u5f53\u6027\u3092\u73fe\u5834\u57fa\u6e96\u3067\u78ba\u5b9a\u3059\u308b\u30025) \u672c\u756a\u3067\u306f\u30c9\u30ea\u30d5\u30c8\u76e3\u8996\u3068\u5b9a\u671f\u518d\u5b66\u7fd2\u30fb\u518d\u8abf\u6574\u3092\u884c\u3046\u3002\u3053\u306e\u4e00\u9023\u306f\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u4ed5\u69d8\u3068\u539f\u7406\u89e3\u8aac\u306b\u6cbf\u3046\u6a19\u6e96\u7684\u306a\u9069\u7528\u624b\u9806\u3067\u3042\u308b\u3002[1][6][7][3][5][2]\n\n\n\n[1] https:\/\/en.wikipedia.org\/wiki\/Isolation_forest<\/p>\n\n\n\n[2] https:\/\/scikit-learn.org\/stable\/modules\/generated\/sklearn.ensemble.IsolationForest.html<\/p>\n\n\n\n[3] https:\/\/scikit-learn.org\/stable\/auto_examples\/ensemble\/plot_isolation_forest.html<\/p>\n\n\n\n[4] https:\/\/arxiv.org\/html\/2403.10802v1<\/p>\n\n\n\n[5] https:\/\/www.mathworks.com\/help\/stats\/anomaly-detection-with-isolation-forest.html<\/p>\n\n\n\n[6] https:\/\/www.digitalocean.com\/community\/tutorials\/anomaly-detection-isolation-forest<\/p>\n\n\n\n[7] https:\/\/anderfernandez.com\/en\/blog\/isolation-forest-in-python\/<\/p>\n\n\n\n[8] https:\/\/cran.r-project.org\/web\/packages\/isotree\/vignettes\/An_Introduction_to_Isolation_Forests.html<\/p>\n\n\n\n[9] https:\/\/docs.h2o.ai\/h2o\/latest-stable\/h2o-docs\/data-science\/if.html<\/p>\n\n\n\n[10] https:\/\/gri.jp\/media\/entry\/466<\/p>\n\n\n\n[11] https:\/\/www.geeksforgeeks.org\/machine-learning\/anomaly-detection-using-isolation-forest\/<\/p>\n\n\n\n[12] https:\/\/majdarbash.github.io\/aws-cmls\/2019-11-21-isolation-forest-algorithm\/<\/p>\n\n\n\n[13] https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0169023X24000260<\/p>\n\n\n\n[14] https:\/\/cpp-learning.com\/isolationforest\/<\/p>\n\n\n\n[15] https:\/\/cs.nju.edu.cn\/zhouzh\/zhouzh.files\/publication\/icdm08b.pdf<\/p>\n\n\n\n[16] https:\/\/data-analysis-stats.jp\/%E6%A9%9F%E6%A2%B0%E5%AD%A6%E7%BF%92\/%E7%95%B0%E5%B8%B8%E6%A4%9C%E5%87%BA%E3%82%A2%E3%83%AB%E3%82%B4%E3%83%AA%E3%82%BA%E3%83%A0-isolation-forest\/<\/p>\n\n\n\n[17] https:\/\/docs.seldon.io\/projects\/alibi-detect\/en\/latest\/od\/methods\/iforest.html<\/p>\n\n\n\n[18] https:\/\/ieeexplore.ieee.org\/document\/10763320\/<\/p>\n\n\n\n[19] https:\/\/dtaianomaly.readthedocs.io\/en\/latest\/api\/anomaly_detection_algorithms\/isolation_forest.html<\/p>\n\n\n\n
\u203b\u672c\u30da\u30fc\u30b8\u306f\u3001AI\u306e\u6d3b\u7528\u3084\u7814\u7a76\u306b\u95a2\u9023\u3059\u308b\u539f\u7406\u30fb\u6a5f\u5668\u30fb\u30c7\u30d0\u30a4\u30b9\u306b\u3064\u3044\u3066\u5b66\u3076\u305f\u3081\u306b\u3001\u500b\u4eba\u7684\u306b\u6574\u7406\u30fb\u8a18\u8ff0\u3057\u3066\u3044\u308b\u3082\u306e\u3067\u3059\u3002\u5185\u5bb9\u306b\u306f\u8aa4\u308a\u3084\u898b\u843d\u3068\u3057\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u3082\u3057\u304a\u6c17\u3065\u304d\u306e\u70b9\u3084\u3054\u52a9\u8a00\u7b49\u3054\u3056\u3044\u307e\u3057\u305f\u3089\u3001\u3054\u9023\u7d61\u3044\u305f\u3060\u3051\u307e\u3059\u3068\u5e78\u3044\u3067\u3059\u3002<\/strong><\/p>\n\n\n\n \u203b\u672c\u30da\u30fc\u30b8\u306e\u5185\u5bb9\u306f\u3001\u500b\u4eba\u7684\u306a\u5b66\u7fd2\u304a\u3088\u3073\u60c5\u5831\u6574\u7406\u3092\u76ee\u7684\u3068\u3057\u3066\u63d0\u4f9b\u3057\u3066\u3044\u308b\u3082\u306e\u3067\u3042\u308a\u3001\u305d\u306e\u6b63\u78ba\u6027\u3001\u5b8c\u5168\u6027\u3001\u6709\u7528\u6027\u7b49\u306b\u3064\u3044\u3066\u3044\u304b\u306a\u308b\u4fdd\u8a3c\u3082\u884c\u3044\u307e\u305b\u3093\u3002\u672c\u30da\u30fc\u30b8\u306e\u60c5\u5831\u3092\u5229\u7528\u3057\u305f\u3053\u3068\u3001\u307e\u305f\u306f\u5229\u7528\u3067\u304d\u306a\u304b\u3063\u305f\u3053\u3068\u306b\u3088\u3063\u3066\u767a\u751f\u3057\u305f\u640d\u5bb3\uff08\u76f4\u63a5\u7684\u30fb\u9593\u63a5\u7684\u30fb\u7279\u5225\u30fb\u5076\u767a\u7684\u30fb\u7d50\u679c\u7684\u640d\u5bb3\u3092\u542b\u307f\u307e\u3059\u304c\u3001\u3053\u308c\u3089\u306b\u9650\u308a\u307e\u305b\u3093\uff09\u306b\u3064\u3044\u3066\u3001\u5f53\u65b9\u306f\u4e00\u5207\u8cac\u4efb\u3092\u8ca0\u3044\u307e\u305b\u3093\u3002\u3054\u5229\u7528\u306f\u5229\u7528\u8005\u3054\u81ea\u8eab\u306e\u8cac\u4efb\u3067\u304a\u9858\u3044\u3044\u305f\u3057\u307e\u3059\u3002<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":" 6. \u6545\u969c\u4e88\u77e5\u306e\u30a2\u30d7\u30ed\u30fc\u30c1 6.7 Isolation Forest Isolation Forest\u306f\u3001\u30c7\u30fc\u30bf\u306e\u4e2d\u3067\u300c\u6570\u304c\u5c11\u306a\u304f\u3001\u5468\u308a\u3068\u6027\u8cea\u304c\u9055\u3046\u70b9\uff08\u7570\u5e38\uff09\u300d\u306f\u3001\u30e9\u30f3\u30c0\u30e0\u306b\u5206\u5272\u3057\u3066\u3044\u304f\u3068\u5c11\u306a\u3044\u56de\u6570\u3067\u533a\u5225\u3067\u304d\u308b\u3001\u3068\u3044\u2026<\/p>\n","protected":false},"author":1,"featured_media":571,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-704","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research"],"_links":{"self":[{"href":"https:\/\/www.shin-ichi.org\/index.php?rest_route=\/wp\/v2\/posts\/704","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.shin-ichi.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.shin-ichi.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.shin-ichi.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.shin-ichi.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=704"}],"version-history":[{"count":2,"href":"https:\/\/www.shin-ichi.org\/index.php?rest_route=\/wp\/v2\/posts\/704\/revisions"}],"predecessor-version":[{"id":819,"href":"https:\/\/www.shin-ichi.org\/index.php?rest_route=\/wp\/v2\/posts\/704\/revisions\/819"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.shin-ichi.org\/index.php?rest_route=\/wp\/v2\/media\/571"}],"wp:attachment":[{"href":"https:\/\/www.shin-ichi.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=704"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shin-ichi.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=704"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shin-ichi.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=704"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}