Semi-supervised graph neural networks for pileup noise removal Tianchun Li, Shikun Liu, Yongbin Feng, Garyfallia Paspalaki, Nhan V. Tran, Miaoyuan Liu and Pan Li Eur. Phys. J. C, 83 1 (2023) 99 Published online: 31 January 2023 DOI: 10.1140/epjc/s10052-022-11083-5