M^3ViT: Mixture-of-Experts Vision Transformer for Efficient Multi-task Learning with Model-Accelerator Co-design - liang, hanxue; Fan, Zhiwen; Sarkar, Rishov; Jiang, Ziyu; Chen, Tianlong; Zou, Kai; Cheng, Yu; Hao, Cong; Wang, Zhangyang (Advances in Neural Information Processing Systems, 2022)