Deep Horizon: A machine learning network that recovers accreting black hole parameters Jeffrey van der Gucht, Jordy Davelaar, Luc Hendriks, Oliver Porth, Hector Olivares, Yosuke Mizuno, Christian M. Fromm and Heino Falcke A&A, 636 (2020) A94 Published online: 24 April 2020 DOI: 10.1051/0004-6361/201937014