多轮对话 RAG：把「那它呢」翻译成能检索的问题
用户第二轮问「那它支持导出吗」——这三个字没法直接检索。多轮对话 RAG 的核心动作是 condense：用对话历史把带指代、带省略的追问改写成独立完整的问题再去检索。本文讲清指代消解与历史压缩的做法、改写偏移的坑、以及「检索结果也要进历史」这个常被忽略的细节。
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