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RAG检索模型选型:Bi-Encoder、Cross-Encoder、SPLADE与ColBERT的技术对比
构建RAG系统时,Bi-Encoder、Cross-Encoder、SPLADE、ColBERT这几个术语几乎都会在一起出现,表面上看它们都在做文本相似度计算但为什么需要这么多不同的模型?是一个不够用吗? 本文将拆解每种模型的工作机制、适用边界,以及如何在实际系统中组合使用。而核心 ...
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