FinRL-Meta: Market Environments and Benchmarks for Data-Driven Financial Reinforcement Learning - Liu, Xiao-Yang; Xia, Ziyi; Rui, Jingyang; Gao, Jiechao; Yang, Hongyang; Zhu, Ming; Wang, Christina; Wang, Zhaoran; Guo, Jian (Advances in Neural Information Processing Systems, 2022)