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Leon Lang

4 accepted papers

2025

The Perils of Optimizing Learned Reward Functions: Low Training Error Does Not Guarantee Low Regret

ICML 2025poster

In reinforcement learning, specifying reward functions that capture the intended task can be very challenging. Reward learning aims to address this issue by *learning* the reward function. However, a learned reward model may have a low error on the data distribution, and yet subsequently produce a p…

Cited by 1SourcePDFScholar
2024

When Your AIs Deceive You: Challenges of Partial Observability in Reinforcement Learning from Human Feedback

NeurIPS 2024poster

Past analyses of reinforcement learning from human feedback (RLHF) assume that the human evaluators fully observe the environment. What happens when human feedback is based only on partial observations? We formally define two failure cases: deceptive inflation and overjustification. Modeling the hum…

Cited by 4SourcePDFScholar