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The SRC schematic for a two-class problem, where y is the unlabeled sample. D1 and D2 represent subdictionaries composed of all normalized samples belonging to class 1 and class 2, respectively. The sparse representation α can be divided into two subvectors (α1 and α2) according to the number of columns in D1 and D2. The black-filled blocks in α represent nonzero elements.
