Sparse Meets Dense: Unified Generative Recommendations with Cascaded Sparse-Dense Representations - Yang, Yuhao; JI, ZhI; Li, Zhaopeng; Li, Yi; Mo, Zhonglin; Ding, Yue; Chen, Kai; Zhang, Zijian; Li, Jie; li, shuanglong; LIN, LIU (Advances in Neural Information Processing Systems, 2025)