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Sobhan Mohammadpour

4 accepted papers

2026

Learning Correlated Reward Models: Statistical Barriers and Opportunities

ICLR 2026poster

Random Utility Models (RUMs) are a classical framework for modeling user preferences and play a key role in reward modeling for Reinforcement Learning from Human Feedback (RLHF). However, a crucial shortcoming of many of these techniques is the Independence of Irrelevant Alternatives (IIA) assumptio…

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2026

Reevaluating Policy Gradient Methods for Imperfect-Information Games

ICLR 2026poster

In the past decade, motivated by the putative failure of naive self-play deep reinforcement learning (DRL) in adversarial imperfect-information games, researchers have developed numerous DRL algorithms based on fictitious play (FP), double oracle (DO), and counterfactual regret minimization (CFR). I…

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2024

Maximum entropy GFlowNets with soft Q-learning

AISTATS 2024poster

Generative Flow Networks (GFNs) have emerged as a powerful tool for sampling discrete objects from unnormalized distributions, offering a scalable alternative to Markov Chain Monte Carlo (MCMC) methods. While GFNs draw inspiration from maximum entropy reinforcement learning (RL), the connection betw…

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