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Nowadays, in such a high-tech living lifestyle, profusion of multimedia data are produced and propagated around the world. To identify meaningful semantic concepts from the large amount of data, one of the major challenges is called the data imbalance problem. Data imbalance occurs when the number of positive instances (i.e., instances which contain the target concept) is greatly less than the number of negative instances (i.e., instances which do not contain the target concept). In otherdoi:10.1109/iri.2015.20 dblp:conf/iri/HaCS15 fatcat:qlptqb72z5habevpne5qvn56be