Author

Namjun Lee

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#artificial intelligence Preprint Aug 2026

PRO-Step: Step-level Process Reward Optimization for Retrieval-Augmented Generation

This work trains a generative PRM that evaluates both dimensions, employs PRM-guided value tree search to construct preference pairs contrasting valid steps against flawed ones, and optimize the policy via step-level Direct Preference Optimization.

Minkeon Kim, Namjun Lee, Jaekwang Kim · 0 citations