hierarchical classification

{{Other uses|Hierarchy (disambiguation)}}

{{Distinguish|Taxonomy}}

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Hierarchical classification is a system of grouping things according to a hierarchy.{{cite web |title=Hierarchical Classification |url=https://www.canr.msu.edu/resources/hierarchical-classification |website=Curriculum Resources for Michigan Agriculture Teachers |access-date=23 July 2022 |language=en}}

In the field of machine learning, hierarchical classification is sometimes referred to as instance space decomposition,{{cite journal |last=Cohen |first=S. |last2=Rokach |first2=L. |last3=Maimon |first3=O. |title=Decision-tree instance-space decomposition with grouped gain-ratio |journal=Information Sciences |volume=177 |issue=17 |pages=3592–3612 |publisher=Elsevier |year=2007 |doi=10.1016/j.ins.2007.01.016 }} which splits a complete multi-class problem into a set of smaller classification problems.