Hongfei Sun Yusheng Cheng Hierarchical coarse-grained partitioning driven by the synergy between label semantic compression and skewed distribution characteristics. 2026 131866 316 Expert Syst. Appl. https://doi.org/10.1016/j.eswa.2026.131866 db/journals/eswa/eswa316.html#SunC26 streams/journals/eswa