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Nicolas Perez-Nieves

6 accepted papers

2025

Capturing Individual Human Preferences with Reward Features

NeurIPS 2025poster

Reinforcement learning from human feedback usually models preferences using a reward function that does not distinguish between people. We argue that this is unlikely to be a good design choice in contexts with high potential for disagreement, like in the training of large language models. We formal…

Cited by 0SourceScholar
2023

Human-Timescale Adaptation in an Open-Ended Task Space

ICML 2023oral

Foundation models have shown impressive adaptation and scalability in supervised and self-supervised learning problems, but so far these successes have not fully translated to reinforcement learning (RL). In this work, we demonstrate that training an RL agent at scale leads to a general in-context l…

Cited by 111SourcePDFScholar
2023

Learning to Shape Rewards Using a Game of Two Partners

AAAI 2023technical

Reward shaping (RS) is a powerful method in reinforcement learning (RL) for overcoming the problem of sparse or uninformative rewards. However, RS typically relies on manually engineered shaping-reward functions whose construc- tion is time-consuming and error-prone. It also requires domain knowledg…

Cited by 8SourcePDFScholar
2022

LIGS: Learnable Intrinsic-Reward Generation Selection for Multi-Agent Learning

ICLR 2022poster

Efficient exploration is important for reinforcement learners (RL) to achieve high rewards. In multi-agent systems, coordinated exploration and behaviour is critical for agents to jointly achieve optimal outcomes. In this paper, we introduce a new general framework for improving coordination and per…

Cited by 26SourcePDFScholar
2021

Modelling Behavioural Diversity for Learning in Open-Ended Games

ICML 2021oral

Promoting behavioural diversity is critical for solving games with non-transitive dynamics where strategic cycles exist, and there is no consistent winner (e.g., Rock-Paper-Scissors). Yet, there is a lack of rigorous treatment for defining diversity and constructing diversity-aware learning dynamics…

Cited by 79SourcePDFScholar