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本文将构建一个混合RAG系统，并行使用FAISS语义检索与BM25关键词检索，通过互惠排名融合（RRF）合并结果，以兼顾理解力与精确度。借助LangGraph编排流程、Streamlit实现可视化界面，支持切换检索模式并透明展示检索块与得分，有效解决单一检索器的失效问题。

先抛一个结论：为了给同机 TCP 提速，作者写了两版实现——第一版把内存拷贝次数压到了理论下限（一次），第二版故意多拷一次（两次）。结果，慢的是那个"更省"的一次拷贝版本，最终被拿去提交内核的，反而是"两次拷贝"的方案。 先抛一个结论：为了给同 ...