A new interesting paper on the usage of recommender systems for the problem of compiler autotuning has been published in LCTES’20
Stefano Cereda, Gianluca Palermo, Paolo Cremonesi, and Stefano Doni. “A Collaborative Filtering Approach for the Automatic Tuning of Compiler Optimisations”. In The 21st ACM SIGPLAN/SIGBED Conference on Languages, Compilers, and Tools for Embedded Systems (LCTES ’20). Association for Computing Machinery, New York, NY, USA, 15–25.