手法を比較

	半教師ありワンクラスSVM	アイソレーションフォレスト
分野	機械学習	機械学習
系統	Machine learning	Machine learning
提唱年	2001–2004	2008
提唱者	Extension of Scholkopf et al. (2001); semi-supervised variants studied ca. 2004–2010	Liu, F.T., Ting, K.M. & Zhou, Z.-H.
種類	Semi-supervised anomaly / novelty detection	Unsupervised ensemble (random partitioning trees)
原典	Munoz, A. & Muruzabal, J. (2004). Self-Organising Maps for Outlier Detection. Neurocomputing, 58–60, 953–956.	Liu, F.T., Ting, K.M. & Zhou, Z.-H. (2008). Isolation Forest. IEEE ICDM, 413–422.
別名	SS-OCSVM, semi-supervised OC-SVM, semi-supervised novelty detection SVM, transductive one-class SVM	Isolation Forest (Aykırı Değer Tespiti), iForest, isolation forest anomaly detection
関連	5	5
概要	Semi-supervised One-class SVM extends the classic One-class SVM anomaly detector by incorporating unlabeled observations alongside a small set of known normal examples. The unlabeled data helps the model learn a tighter, more informative decision boundary in feature space, reducing false positives and improving anomaly recall compared to the purely unsupervised baseline.	Isolation Forest is an unsupervised machine-learning method for anomaly and outlier detection, introduced by Liu, Ting and Zhou in 2008, that isolates anomalies through random partitioning of the data. It works without any labelled anomaly data and scales to high-dimensional datasets.