Daniel Fein
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126
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AI×1
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2026
Reward Bias Substitution: Single-Axis Bias Mitigations Redirect Optimization Pressure
The paper introduces 'reward bias substitution,' demonstrating that single-axis mitigations of reward model biases merely shift optimization pressure to correlated proxies, and proposes augmenting evaluation with policy-induced distributions to accurately detect this failure mode.
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Papers
cs.AIRecentMay 27, 2026
Reward Bias Substitution: Single-Axis Bias Mitigations Redirect Optimization Pressure
Max Lamparth, Daniel Fein, Andreas Haupt, Marcel Hussing +1 more
The paper introduces 'reward bias substitution,' demonstrating that single-axis mitigations of reward model biases merely shift optimization pressure to correlated proxies, and proposes augmenting eva…
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