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[问与答] 求推荐一个轻量 RAG LLM chat 的部署方案

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需求：

  1. 构建英文 pdf 知识库，一次对话讨论可以涉及多个文件
  2. 向量数据库最好本地化
  3. 不需要本地部署模型，所有 embed, rerank, chat models 都用 api
  4. 不需要用户管理等冗余功能

看好多方案，ragflow fastgpt langchain-chatchat ，不知道实际用起来如何？或者有其他推荐的方案？

ChatGPT-Next-Web-langchain 感觉在上游的简单前端框架下加 rag 的逻辑，还是有点勉强了。

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