ScaleAcross Explorer: Exploring Communication Optimization for Scale-Across AI Model Training. - Minghao Li; Alicia Golden; Samuel Hsia; Michael Kuchnik; Adi Gangidi; Xu Zhang; Ashmitha Jeevaraj Shetty; Zachary DeVito; Weiwei Chu; Dong He; Haoci Zhang; Yuchen Hao; et al. (CoRR, 2026)