2 code implementations • 3 Apr 2024 • Philipp Hager, Romain Deffayet, Jean-Michel Renders, Onno Zoeter, Maarten de Rijke
Our experiments reveal that gains in click prediction do not necessarily translate to enhanced ranking performance on expert relevance annotations, implying that conclusions strongly depend on how success is measured in this benchmark.
1 code implementation • 28 Nov 2023 • Romain Deffayet, Thibaut Thonet, Dongyoon Hwang, Vassilissa Lehoux, Jean-Michel Renders, Maarten de Rijke
Simulators can provide valuable insights for researchers and practitioners who wish to improve recommender systems, because they allow one to easily tweak the experimental setup in which recommender systems operate, and as a result lower the cost of identifying general trends and uncovering novel findings about the candidate methods.
no code implementations • 26 May 2023 • Sami Jullien, Romain Deffayet, Jean-Michel Renders, Paul Groth, Maarten de Rijke
Motivated by the efficiency of $L_2$-based learning, we propose to jointly learn expectiles and quantiles of the return distribution in a way that allows efficient learning while keeping an estimate of the full distribution of returns.
2 code implementations • 19 Apr 2023 • Romain Deffayet, Philipp Hager, Jean-Michel Renders, Maarten de Rijke
We prove that debiasedness is a necessary condition for recovering unbiased and consistent relevance scores and for the invariance of click prediction under covariate shift.
no code implementations • 20 Jan 2023 • Romain Deffayet, Thibaut Thonet, Jean-Michel Renders, Maarten de Rijke
Our findings suggest that representation learning using generative models is a promising direction towards generalizable RL-based slate recommendation.
no code implementations • 3 Jan 2023 • Romain Deffayet, Thibaut Thonet, Jean-Michel Renders, Maarten de Rijke
In this paper, we argue that the paradigm commonly adopted for offline evaluation of sequential recommender systems is unsuitable for evaluating reinforcement learning-based recommenders.