Table 1. The classification performance after the pretreatment of clustering.

Method	Sp (%)	Sn (%)	ACC (%)
RF	91.2	90.4	90.8
K-means+RF	92.4	91.2	91.8
Hierarchical+RF	92.6	91.4	92.0
SOM+RF	93.4	92.5	92.9