手法を比較

	オンライン決定木	半教師あり決定木
分野	機械学習	機械学習
系統	Machine learning	Machine learning
提唱年	2000	2000s
提唱者	Domingos, P. & Hulten, G.	Various (Levin & Shapiro; Zhu & Goldberg lineage)
種類	Incremental supervised classifier	Semi-supervised classifier / regressor
原典	Domingos, P., & Hulten, G. (2000). Mining very fast data streams. In Proceedings of the 6th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining (pp. 71–80). ACM.	Levin, E. & Shapiro, E. (2000). Learning Decision Trees from Semi-labeled Examples. Proceedings of the ICML Workshop on Attribute-Value and Relational Learning.
別名	Hoeffding Tree, VFDT, Very Fast Decision Tree, incremental decision tree	SSDT, semi-supervised tree induction, self-training decision tree, label-propagation tree
関連	6	4
概要	An Online Decision Tree is a decision tree that grows incrementally from a continuous stream of data without revisiting past examples. The dominant algorithm, the Hoeffding Tree (VFDT), uses the Hoeffding bound to decide when enough examples have been seen at a node to split it confidently, enabling scalable, real-time classification on potentially infinite data streams.	A Semi-supervised Decision Tree extends standard decision tree induction — such as CART or C4.5 — to exploit unlabeled observations alongside the labeled training set. By iteratively assigning tentative labels to unlabeled data and incorporating them into the growing or splitting process, the algorithm can achieve better accuracy than a fully supervised tree trained on the labeled subset alone, which is especially valuable when labeling is expensive or time-consuming.