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Hierarchical classification
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<p>Hierarchical <a href="/facts/Classification/0YnvM2EF">classification</a> is a system of grouping things according to a hierarchy. </p><p>In the field of <a href="/facts/Machine_learning/e0w0XJTu">machine learning</a>, hierarchical classification is sometimes referred to as instance space decomposition, which splits a complete <a href="/facts/Multi-class_classification/aS7sV9EX">multi-class</a> problem into a set of smaller classification problems. </p>