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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Performance comparison of using different sensing units in the case of no feature selection, class independent feature selection, and class dependent feature selection. (a) Performance obtained using the non-hierarchical model; (b) Performance obtained using the hierarchical model.