UltraMemV2: Memory Networks Scaling to 120B Parameters with Superior Long-Context Learning - Huang, Zihao; Bao, Yu; Min, Qiyang; Chen, Siyan; Guo, Ran; Huang, Hongzhi; Zhu, Defa; Wu, Banggu; Zeng, Yutao; Xun, zhou; Qiao, Siyuan (International Conference on Learning Representations, 2026)