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ID3 and CART were invented independently at around the same time (between 1970 and 1980){{Citation needed|date=August 2014}}, yet follow a similar approach for learning a decision tree from training tuples.
It has also been proposed to leverage concepts of [[fuzzy set theory]] for the definition of a special version of decision tree, known as Fuzzy Decision Tree (FDT).<ref name="Janikow1998">{{Cite journal | doi=10.1109/3477.658573| title=Fuzzy decision trees: issues and methods| journal=IEEE Transactions on Systems, Man, and Cybernetics
In this type of fuzzy classification, generally, an input vector <math>\textbf{x}</math> is associated with multiple classes, each with a different confidence value.
Boosted ensembles of FDTs have been recently investigated as well, and they have shown performances comparable to those of other very efficient fuzzy classifiers.<ref name="Barsacchi2020">{{Cite journal | url=http://www.sciencedirect.com/science/article/pii/S0957417420302608 | doi=10.1016/j.eswa.2020.113436|
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