CUHK & Meituan Add Process Scores to Agents

🔑 Key Takeaways

• •CUHK and Meituan researchers introduced **Agent-RRM**, a multi-faceted reward model that evaluates full agent trajectories with reasoning traces, critiques, and 0-1 quality scores to address sparse outcome-based rewards in agentic RL[1].
• •Agent-RRM was fine-tuned using GRPO (likely Generalized Reward Preference Optimization) to calibrate its scores, ensuring they are reliable rather than arbitrary[1].
• •The **Reagent framework** integrates Agent-RRM outputs via three strategies: Text-augmented Refinement, Reward-augmented Guidance (using scalar scores in RL reward functions), and Unified Feedback Integration[1].

🛠️ Technical Deep Dive

• •Agent-RRM processes agent trajectories to generate three outputs: explicit reasoning traces, detailed critiques, and a scalar 0-1 process score for overall quality[1].
• •Fine-tuning of Agent-RRM employed GRPO, an RL method to align and calibrate the reward model's scoring mechanism meta-ly[1].
• •Reagent's Reward-augmented Guidance mixes the scalar score from Agent-RRM into the total RL reward function alongside task success signals[1].
• •Improvements shown on GAIA (general AI assistant benchmark) and WebWalkerQA (web navigation QA tasks), highlighting gains in complex, multi-modal agent tasks[1].

🔮 Future ImplicationsAI analysis grounded in cited sources

⏳ Timeline