Comparar métodos
Examine os métodos selecionados lado a lado; as linhas que diferem ficam destacadas.
| Local Outlier Factor (LOF)× | Isolation Forest× | One-Class SVM× | |
|---|---|---|---|
| Área | Aprendizado de máquina | Aprendizado de máquina | Aprendizado de máquina |
| Família | Machine learning | Machine learning | Machine learning |
| Ano de origem≠ | 2000 | 2008 | 1999–2001 |
| Autor original≠ | Breunig, M. M.; Kriegel, H.-P.; Ng, R. T.; Sander, J. | Liu, F.T., Ting, K.M. & Zhou, Z.-H. | Scholkopf, B., Platt, J. C., Smola, A. J., Williamson, R. C. |
| Tipo≠ | Density-based anomaly detection (unsupervised) | Unsupervised ensemble (random partitioning trees) | Anomaly / novelty detection (unsupervised) |
| Fonte seminal≠ | 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 ↗ | Liu, F.T., Ting, K.M. & Zhou, Z.-H. (2008). Isolation Forest. IEEE ICDM, 413–422. DOI ↗ | 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 ↗ |
| Outros nomes≠ | LOF, local outlier factor, density-based outlier detection, local density deviation | Isolation Forest (Aykırı Değer Tespiti), iForest, isolation forest anomaly detection | OCSVM, one-class support vector machine, novelty SVM, unsupervised SVM |
| Relacionados≠ | 4 | 5 | 3 |
| Resumo≠ | 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. | 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. | 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. |
| ScholarGateConjunto de dados ↗ |
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