This paper describes the solution of the POLINKS team to the RecSys Challenge 2019 that focuses on the task of predicting the last click-out in a session-based interaction. We propose an ensemble approach comprising a matrix factorization for modeling the interaction user-item, and a session-aware learning model implemented with a recurrent neural network. This method appears to be effective in predicting the last click-out scoring a 0.60277 of Mean Reciprocal Rank on the local test set.
@article{arxiv.2002.03124,
title = {Predict your Click-out: Modeling User-Item Interactions and Session Actions in an Ensemble Learning Fashion},
author = {Andrea Fiandro and Giorgio Crepaldi and Diego Monti and Giuseppe Rizzo and Maurizio Morisio},
journal= {arXiv preprint arXiv:2002.03124},
year = {2020}
}