FiMi-RM reduces length bias in RLHF reward models by fitting a nonlinear length-reward curve and training the reward model to be uncorrelated with that fitted curve.
Deepseek-v3 technical report, 2025
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Bias Fitting to Mitigate Length Bias of Reward Model in RLHF
FiMi-RM reduces length bias in RLHF reward models by fitting a nonlinear length-reward curve and training the reward model to be uncorrelated with that fitted curve.