CombinationTS: A Modular Framework for Understanding Time-Series Forecasting Models. - Xiaorui Wang; Fanda Fan; Chenxi Wang; Yuxuan Yang; Rui Tang; Kuoyu Gao; Simiao Pang; Yuanfeng Shang; Zhipeng Liu; Wanling Gao; Lei Wang; Jianfeng Zhan (CoRR, 2026)