Steering undulatory micro-swimmers in a fluid flow through reinforcement learning Zakarya El Khiyati, Raphaël Chesneaux, Laëtitia Giraldi and Jérémie Bec Eur. Phys. J. E, 46 6 (2023) 43 Published online: 12 June 2023 DOI: 10.1140/epje/s10189-023-00293-8