Amortized rejection sampling in universal probabilistic programming - Naderiparizi, S; Scibior, A; Munk, A; Ghadiri, M; Güneş Baydin, A; Gram-Hansen, B; Schroeder de Witt, C; Zinkov, R; Torr, PHS; Rainforth, T; Teh, YW; Wood, F (Journal of Machine Learning Research, 2022)