Alibaba Proposes PAO to Prevent Embedding Collapse in RL Fine-Tuning for Retrieval
_reachsumit · x · 2026-09-01
Addressing embedding geometry degradation when using RL to fine-tune retrievers on frozen indices, Alibaba proposes PAO (Positive-Advantage-Only). This method selectively applies gradient updates only to items with positive advantages, pulling query embeddings towards high-reward regions while preserving global topological stability.
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