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PAIR: Prefix-Aware Internal Reward Model for Multi-Turn Agent Optimization

Kim, Wonjoong et al.
arXiv (All) · Papers
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A significant hurdle for current LLMs is the execution of complex, multi-stage tasks. Group Relative Policy Optimization (GRPO) has been emerging as a leading choice, but its reliance on sparse outcome rewards severely limits credit assignment across intermediate steps. Existing remedies such as run
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