AdaSTaR: Adaptive Data Sampling for Training Self-Taught Reasoners - Koh, Reiss; Oh, Wonbeen; Jang, Jaein; Lee, MinHyung; Kim, Hyeongjin; Kim, Ah; Kim, Joonkee; Lee, Junghyun; Kim, Taehyeon; Yun, Se-Young (Advances in Neural Information Processing Systems, 2025)