Prediction of Major Solar Flares Using Interpretable Class-dependent Reward Framework with Active Region Magnetograms and Domain Knowledge. - Zixian Wu; Xuebao Li; Yanfang Zheng; Rui Wang; Shunhuang Zhang; Jinfang Wei; Yongshang Lv; Liang Dong; Zamri Zainal Abidin; Noraisyah Mohamed Shah; Hongwei Ye; Pengchao Yan; et al. (CoRR, 2026)