A random forest-based selection of optically variable AGN in the VST-COSMOS field D. De Cicco, F. E. Bauer, M. Paolillo, S. Cavuoti, P. Sánchez-Sáez, W. N. Brandt, G. Pignata, M. Vaccari and M. Radovich A&A, 645 (2021) A103 Published online: 22 January 2021 DOI: 10.1051/0004-6361/202039193