Parton labeling without matching: unveiling emergent labelling capabilities in regression models Shikai Qiu, Shuo Han, Xiangyang Ju, Benjamin Nachman and Haichen Wang Eur. Phys. J. C, 83 7 (2023) 622 Published online: 15 July 2023 DOI: 10.1140/epjc/s10052-023-11809-z