RelCon: Relative Contrastive Learning for a Motion Foundation Model for Wearable Data - Xu, Maxwell; Narain, Jaya; Darnell, Gregory; Hallgrimsson, Haraldur; Jeong, Hyewon; Forde, Darren; Fineman, Richard; Raghuram, Karthik; Rehg, James; Ren, Shirley (International Conference on Learning Representations, 2025)