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	Regulariserad Gaussisk Blandningsmodell	Regulariserad k-närmaste granne (kNN)
Ämnesområde	Maskininlärning	Maskininlärning
Familj	Machine learning	Machine learning
Ursprungsår	2000s–2010s	1967–2000s
Upphovsperson	Fraley, C. & Raftery, A. E. (regularization formalized); sklearn team (practical reg_covar parameter)	Extends Cover & Hart (1967); regularization formulations developed through kernel smoothing literature
Typ	Probabilistic clustering with regularization	Instance-based / lazy learner with regularization
Ursprungskälla	Fraley, C. & Raftery, A. E. (2002). Model-based clustering, discriminant analysis, and density estimation. Journal of the American Statistical Association, 97(458), 611–631.	Cover, T. & Hart, P. (1967). Nearest neighbor pattern classification. IEEE Transactions on Information Theory, 13(1), 21–27.
Alias	Regularized GMM, GMM with covariance regularization, stabilized Gaussian mixture model, penalized GMM	regularized kNN, kernel-weighted kNN, distance-regularized nearest neighbors, kNN with regularization
Närliggande	5	4
Sammanfattning	A Regularized Gaussian Mixture Model (GMM) adds a small positive constant to the diagonal of each component covariance matrix during the Expectation-Maximization algorithm, preventing singular or near-singular matrices that cause numerical failures when the data are sparse, high-dimensional, or contain near-duplicate observations.	Regularized k-Nearest Neighbors (kNN) extends the classical nearest-neighbor algorithm by incorporating regularization mechanisms — most commonly kernel-based distance weighting or bandwidth control — that smooth predictions, reduce sensitivity to the choice of k, and lower variance. The result is a more stable and better-calibrated instance-based learner for classification and regression tasks on tabular data.