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Comparison of average per class F-score between basic and PO strategies. (a) FLAT ensembles; (b) hierarchical cost-sensitive strategies: HTD-CS (squares), TPR-W (triangles), and HBAYES-CS (filled circles). Abscissa: per class F-score with base learners trained according to the basic strategy; ordinate: per class F-score with base learners trained according to the PO strategy.
