FlexPlanner: Flexible 3D Floorplanning via Deep Reinforcement Learning in Hybrid Action Space with Multi-Modality Representation - Zhong, Ruizhe; Du, Xingbo; Kai, Shixiong; Tang, Zhentao; Xu, Siyuan; Hao, Jianye; Yuan, Mingxuan; Yan, Junchi (Advances in Neural Information Processing Systems, 2024)