NUWA-Infinity: Autoregressive over Autoregressive Generation for Infinite Visual Synthesis - Liang, Jian; Wu, Chenfei; Hu, Xiaowei; Gan, Zhe; Wang, Jianfeng; Wang, Lijuan; Liu, Zicheng; Fang, Yuejian; Duan, Nan (Advances in Neural Information Processing Systems, 2022)