MedAgentGym: A Scalable Agentic Training Environment for Code-Centric Reasoning in Biomedical Data Science - Xu, Ran; Zhuang, Yuchen; Zhong, Yishan; Yu, Yue; Wang, Zifeng; Tang, Xiangru; Wu, Hang; Wang, May Dongmei; Ruan, Peifeng; Yang, Donghan; Wang, Tao; Xiao, Guanghua; et al. (International Conference on Learning Representations, 2026)