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Improving RLHF (Reinforcement Learning from Human Feedback) with Critique-Generated Reward Models

Improving RLHF (Reinforcement Learning from Human Feedback) with Critique-Generated Reward Models

Practical Solutions for Improving RLHF with Critique-Generated Reward Models

Overview

Language models in reinforcement learning from human feedback (RLHF) face challenges in accurately capturing human preferences. Traditional reward models struggle to reason explicitly about response quality, hindering their effectiveness in guiding language model behavior. The need for a more effective method is evident.

Proposed Solutions

Researchers have introduced Critique-out-Loud (CLoud) reward models, which aim to improve language model performance in RLHF. These models generate detailed critiques of assistant responses before producing scalar rewards for response quality, combining the strengths of classic reward models and the LLM-as-a-Judge framework.

CLoud models are trained using a preference dataset and supervised fine-tuning on oracle critiques for critique generation. The training process involves exploring multi-sample inference techniques, such as self-consistency, to enhance performance.

Value and Benefits

CLoud reward models significantly outperform classic reward models in pairwise preference classification accuracy and win rates in various benchmarks. They offer superior performance in guiding language model behavior and demonstrate substantial improvements over classic reward models.

Future Opportunities

CLoud reward models establish a new paradigm for improving reward models through variable inference computing, laying the groundwork for more sophisticated and effective preference modeling in language model development.

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I believe that AI is only as powerful as the human insight guiding it.

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