Causality-driven Hierarchical Structure Discovery for Reinforcement Learning. - Peng, Shaohui; Hu, Xing; Zhang, Rui; Tang, Ke; Guo, Jiaming; Yi, Qi; Chen, Ruizhi; Zhang, Xishan; Du, Zidong; Li, Ling; Guo, Qi; Chen, Yunji (CoRR, 2022)