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Marco Mussi

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#machine learning Preprint Oct 2026

Learning a Ranking from Human Feedback in Log-Concave Random Utility Models

We study the problem of recovering the ranking of a fixed set of items according to their unknown numerical utilities. At each interaction with the environment, a learner presents the item set to a human and receives comparative feedback of two types. Under full-ranking feedback, each interaction reveals a noisy rankin...

Diego Alovisetti, Marco Mussi, A. Metelli · 0 citations
#machine learning Preprint Oct 2026

Reusing Past Samples in Proximal Policy Optimization: When and How Does It Help?

Among on-policy deep reinforcement learning methods, Proximal Policy Optimization (PPO) has become the de facto standard, due to its consistently strong empirical performance across diverse application domains. However, on-policy methods are inherently sample inefficient: fresh data collected under the current policy i...

Alessandro Montenegro, Riccardo Venturelli, Marco Mussi et al. · 0 citations

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