HAMSTER: Hierarchical Action Models for Open-World Robot Manipulation - Li, Yi; Deng, Yuquan; Zhang, Jesse; Jang, Joel; Memmel, Marius; Garrett, Caelan; Ramos, Fabio; Fox, Dieter; Li, Anqi; Gupta, Abhishek; Goyal, Ankit (International Conference on Learning Representations, 2025)