From Single to Multi-Granularity: Toward Long-Term Memory Association and Selection of Conversational Agents - Xu, Derong; Wen, Yi; Jia, Pengyue; Zhang, Yingyi; Zhang, Wenlin; Wang, Yichao; Guo, Huifeng; Tang, Ruiming; Zhao, Xiangyu; Chen, Enhong; Xu, Tong (International Conference on Learning Representations, 2026)