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The Az values of the area under ROC curves for top k retrievals using segmentation initialized by R1 and R2 for the two cycles of cross validation: (a) Test in set P1 (train in set P2) by R1, (b) test in set P2 (train in set P1) by R1, (c) test in set P1 (train in set P2) by R2, (d) test in set P2 (train in set P1) by R2, and (e) average of (a)–(d).
