手法を比較

	半教師あり DBSCAN	K-means クラスタリング
分野	機械学習	機械学習
系統	Machine learning	Machine learning
提唱年	2000s	1967 (formalized 1982)
提唱者	Ester, M. et al. (DBSCAN base); semi-supervised extensions by multiple authors (2000s–2010s)	MacQueen, J. B.; Lloyd, S. P.
種類	Constrained density-based clustering	Partitional clustering
原典	Ester, M., Kriegel, H.-P., Sander, J., & Xu, X. (1996). A density-based algorithm for discovering clusters in large spatial databases with noise. In Proceedings of the 2nd International Conference on Knowledge Discovery and Data Mining (KDD-96), pp. 226–231. AAAI Press.	Lloyd, S. P. (1982). Least squares quantization in PCM. IEEE Transactions on Information Theory, 28(2), 129–137.
別名	Constrained DBSCAN, SS-DBSCAN, DBSCAN with must-link/cannot-link constraints, seeded DBSCAN	k-means clustering, Lloyd's algorithm, k-means partitioning, hard k-means
関連	5	4
概要	Semi-supervised DBSCAN extends the canonical density-based clustering algorithm (Ester et al., 1996) by incorporating a small set of pairwise or label constraints — must-link pairs that must share a cluster, cannot-link pairs that must be separated, or a handful of known labels — to guide cluster formation while retaining DBSCAN's ability to discover arbitrary-shaped clusters and flag noise points.	K-means is a classic unsupervised partitional clustering algorithm that divides a dataset into K non-overlapping groups by iteratively assigning each observation to its nearest centroid and updating centroids as the mean of their assigned points. It is one of the most widely used exploratory tools in machine learning and data analysis.