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Routing Without Embeddings: Fast And Interpretable Routing With Regular Expressions

Lu, Yifan et al.
arXiv (All) · Papers
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Large Language Model (LLM) routers commonly rely on neural query embeddings, with larger encoders expected to better capture query intent and difficulty. Yet scaling Qwen2.5 encoders from 0.5B to 72B parameters brings little improvement in routing accuracy (Figure 1b), suggesting that small encoders
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