Fig. 6: Confusion matrices of hierarchical classification results using different coarse–fine configurations.

a Coarse classifier distinguishes HC from CP (LC + GC), and a fine classifier differentiates LC from GC. b Coarse classifier separates GC from non-GC (HC + LC), and fine classifier distinguishes HC from LC. c Coarse classifier separates LC from non-LC (HC + GC), and the fine classifier distinguishes HC from GC.