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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/).
Different fusion blocks in feature fusion scheme. From the left to right: Multiply Fusion (MUL) Block, Element-Wise Add Fusion (ADD) Block, Concatenation Fusion (CAT) Block and Spatial Attention Fusion (SAF) Block.