《Blockchain Empowered Asynchronous Federated Learning for Secure Data Sharing in Internet of Vehicles》阅读笔记关键词：数据共享、区块链、异步联邦学习、深度强化学习、虚拟车辆互联网主要贡献：提出了一种hybrid blockchain - PermiDAG，它由一个主许可区块链（由路边单元RSU维护