NS-Gym: Open-Source Simulation Environments and Benchmarks for Non-Stationary Markov Decision Processes. - Nathaniel S. Keplinger; Baiting Luo; Iliyas Bektas; Yunuo Zhang; Kyle Hollins Wray; Aron Laszka; Abhishek Dubey; Ayan Mukhopadhyay (CoRR, 2025)