Dead or alive: Distinguishing active from passive particles using supervised learning Giulia Janzen, Xander L. J. A. Smeets, Vincent E. Debets, Chengjie Luo, Cornelis Storm, Liesbeth M. C. Janssen and Simone Ciarella EPL, 143 1 (2023) 17004 Published online: 28 June 2023 DOI: 10.1209/0295-5075/acdf1b