השוואת שיטות
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| מכונת וקטורים תומכים חד-מחלקתית (One-Class SVM)× | יער בידוד× | Local Outlier Factor (LOF)× | |
|---|---|---|---|
| תחום | למידת מכונה | למידת מכונה | למידת מכונה |
| משפחה | Machine learning | Machine learning | Machine learning |
| שנת המקור≠ | 1999–2001 | 2008 | 2000 |
| הוגה השיטה≠ | Scholkopf, B., Platt, J. C., Smola, A. J., Williamson, R. C. | Liu, F.T., Ting, K.M. & Zhou, Z.-H. | Breunig, M. M.; Kriegel, H.-P.; Ng, R. T.; Sander, J. |
| סוג≠ | Anomaly / novelty detection (unsupervised) | Unsupervised ensemble (random partitioning trees) | Density-based anomaly detection (unsupervised) |
| מקור מכונן≠ | Scholkopf, B., Platt, J. C., Shawe-Taylor, J., Smola, A. J., & Williamson, R. C. (2001). Estimating the support of a high-dimensional distribution. Neural Computation, 13(7), 1443–1471. DOI ↗ | Liu, F.T., Ting, K.M. & Zhou, Z.-H. (2008). Isolation Forest. IEEE ICDM, 413–422. DOI ↗ | Breunig, M. M., Kriegel, H.-P., Ng, R. T., & Sander, J. (2000). LOF: Identifying density-based local outliers. Proceedings of the 2000 ACM SIGMOD International Conference on Management of Data, 93–104. DOI ↗ |
| כינויים≠ | OCSVM, one-class support vector machine, novelty SVM, unsupervised SVM | Isolation Forest (Aykırı Değer Tespiti), iForest, isolation forest anomaly detection | LOF, local outlier factor, density-based outlier detection, local density deviation |
| קשורות≠ | 3 | 5 | 4 |
| תקציר≠ | One-class SVM is an unsupervised anomaly and novelty detection algorithm that learns a tight boundary around normal training data in a kernel-induced feature space, flagging new observations that fall outside that boundary as outliers. Introduced by Scholkopf et al. in 1999–2001, it extends the SVM framework to the single-class setting where no labelled anomalies are available. | 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. | Local Outlier Factor (LOF) is a density-based, unsupervised anomaly detection algorithm introduced by Breunig, Kriegel, Ng, and Sander in 2000. It assigns each data point a continuous outlier score that quantifies how isolated that point is relative to its local neighborhood, enabling detection of anomalies that global methods miss because they blend into dense clusters elsewhere in the space. |
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