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Artificial scenario 2 for transfer clustering. (a) TI_S2: the image acting as the source domain; (b)–(c) TI_T2_1 to TI_T2_2: the target domain images owning the same cluster number as that in TI_S2, but different distributions; (d)–(g) TI_T2_3 to TI_T2_6: the target domain images whose cluster numbers are different from that of TI_S2.
