Learning from What You Retrieve: Online RL Fine-Tuning for Semantic Retrieval
This work proposes PAO (Positive-Advantage-Only), a selective RL optimization method that selectively applies gradient updates only to retrieved items with positive advantages, effectively pulling query embed- dings toward high-reward regions while preserving global topo- logical stability.
Shao-Wei Wei, Chong Huang, Songtao Fang et al.
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