NCCL EP: Towards a Unified Expert Parallel Communication API for NCCL. - Amos Goldman; Nimrod Boker; Maayan Sheraizin; Nimrod Admoni; Artem Polyakov; Subhadeep Bhattacharya; Fan Yu; Kai Sun; Georgios Theodorakis; Hsin-Chun Yin; Peter-Jan Gootzen; Aamir Shafi; et al. (CoRR, 2026)