{"id":23912,"date":"2026-06-10T14:51:57","date_gmt":"2026-06-10T06:51:57","guid":{"rendered":"https:\/\/ab123.xyz\/?p=23912"},"modified":"2026-06-10T14:51:57","modified_gmt":"2026-06-10T06:51:57","slug":"langchain-rag%e7%b3%bb%e7%bb%9f%e6%a3%80%e7%b4%a2%e5%a2%9e%e5%bc%ba%e7%94%9f%e6%88%90%e9%85%8d%e7%bd%ae%e6%8c%87%e5%8d%97%ef%bc%9a%e4%bb%8e%e5%9f%ba%e7%a1%80%e5%88%b0%e5%ae%9e%e6%88%98","status":"publish","type":"post","link":"https:\/\/ab123.xyz\/?p=23912","title":{"rendered":"LangChain RAG\u7cfb\u7edf\u68c0\u7d22\u589e\u5f3a\u751f\u6210\u914d\u7f6e\u6307\u5357\uff1a\u4ece\u57fa\u7840\u5230\u5b9e\u6218"},"content":{"rendered":"<p>\u5728\u4eba\u5de5\u667a\u80fd\u4e0e\u81ea\u7136\u8bed\u8a00\u5904\u7406\u9886\u57df\uff0c<strong>LangChain RAG\u7cfb\u7edf<\/strong>\uff08\u68c0\u7d22\u589e\u5f3a\u751f\u6210\uff09\u6b63\u6210\u4e3a\u6784\u5efa\u667a\u80fd\u95ee\u7b54\u3001\u6587\u6863\u5206\u6790\u7b49\u5e94\u7528\u7684\u6838\u5fc3\u5de5\u5177\u3002\u5b83\u901a\u8fc7\u5c06\u5916\u90e8\u77e5\u8bc6\u5e93\u4e0e\u5927\u578b\u8bed\u8a00\u6a21\u578b\u7ed3\u5408\uff0c\u5927\u5e45\u63d0\u5347\u4e86\u56de\u7b54\u7684\u51c6\u786e\u6027\u4e0e\u65f6\u6548\u6027\u3002\u672c\u6587\u5c06\u56f4\u7ed5<a href=\"https:\/\/www.langchain.com\" target=\"_blank\">\u5b98\u65b9\u7f51\u7ad9<\/a>\u63d0\u4f9b\u7684\u6280\u672f\u6587\u6863\uff0c\u8be6\u7ec6\u89e3\u6790\u5176\u914d\u7f6e\u65b9\u6cd5\u3001\u6838\u5fc3\u4f18\u52bf\u53ca\u5b9e\u9645\u5e94\u7528\u573a\u666f\u3002<\/p>\n<h2>LangChain RAG\u7cfb\u7edf\u7684\u57fa\u672c\u67b6\u6784\u4e0e\u6838\u5fc3\u529f\u80fd<\/h2>\n<p>LangChain RAG\u7cfb\u7edf\u7684\u5e95\u5c42\u8bbe\u8ba1\u9075\u5faa\u201c\u68c0\u7d22-\u589e\u5f3a-\u751f\u6210\u201d\u4e09\u9636\u6bb5\u6d41\u7a0b\u3002\u9996\u5148\uff0c\u7cfb\u7edf\u901a\u8fc7\u5411\u91cf\u6570\u636e\u5e93\uff08\u5982Chroma\u3001Pinecone\uff09\u5bf9\u6587\u6863\u8fdb\u884c\u7d22\u5f15\uff0c\u5c06\u6587\u672c\u8f6c\u6362\u4e3a\u8bed\u4e49\u5411\u91cf\uff1b\u5176\u6b21\uff0c\u5f53\u7528\u6237\u63d0\u51fa\u67e5\u8be2\u65f6\uff0c\u7cfb\u7edf\u6267\u884c\u76f8\u4f3c\u6027\u68c0\u7d22\uff0c\u53ec\u56de\u6700\u76f8\u5173\u7684\u6587\u6863\u7247\u6bb5\uff1b\u6700\u540e\uff0c\u5c06\u8fd9\u4e9b\u7247\u6bb5\u4f5c\u4e3a\u4e0a\u4e0b\u6587\u6ce8\u5165\u63d0\u793a\u8bcd\uff0c\u7531\u8bed\u8a00\u6a21\u578b\u751f\u6210\u6700\u7ec8\u56de\u7b54\u3002\u8fd9\u4e00\u673a\u5236\u6709\u6548\u89e3\u51b3\u4e86\u4f20\u7edf\u5927\u6a21\u578b\u201c\u77e5\u8bc6\u622a\u6b62\u65e5\u671f\u201d\u548c\u201c\u5e7b\u89c9\u201d\u95ee\u9898\u3002<\/p>\n<h3>\u5173\u952e\u914d\u7f6e\u7ec4\u4ef6<\/h3>\n<ul>\n<li><strong>\u6587\u6863\u52a0\u8f7d\u5668\uff08Document Loader\uff09<\/strong>\uff1a\u652f\u6301PDF\u3001Markdown\u3001\u7f51\u9875\u7b49\u683c\u5f0f\uff0c\u901a\u8fc7LangChain\u5185\u7f6e\u7684\u52a0\u8f7d\u5668\u5feb\u901f\u5bfc\u5165\u3002<\/li>\n<li><strong>\u6587\u672c\u5206\u5272\u5668\uff08Text Splitter\uff09<\/strong>\uff1a\u6839\u636e\u53e5\u5b50\u3001\u6bb5\u843d\u6216\u81ea\u5b9a\u4e49\u5757\u5927\u5c0f\u5c06\u6587\u6863\u5207\u5206\uff0c\u63a8\u8350\u4f7f\u7528RecursiveCharacterTextSplitter\u4fdd\u6301\u8bed\u4e49\u5b8c\u6574\u3002<\/li>\n<li><strong>\u5411\u91cf\u5b58\u50a8\uff08Vector Store\uff09<\/strong>\uff1a\u9009\u62e9FAISS\u6216Chroma\u8fdb\u884c\u672c\u5730\u90e8\u7f72\uff0c\u6216\u4f7f\u7528Pinecone\u5b9e\u73b0\u4e91\u4e0a\u5f39\u6027\u6269\u5c55\u3002<\/li>\n<li><strong>\u68c0\u7d22\u5668\uff08Retriever\uff09<\/strong>\uff1a\u914d\u7f6eTop-K\u6570\u91cf\uff08\u901a\u5e385-20\u4e2a\u7247\u6bb5\uff09\uff0c\u5e76\u53ef\u901a\u8fc7MMR\uff08\u6700\u5927\u8fb9\u9645\u76f8\u5173\u6027\uff09\u589e\u5f3a\u7ed3\u679c\u591a\u6837\u6027\u3002<\/li>\n<li><strong>\u63d0\u793a\u6a21\u677f\uff08Prompt Template\uff09<\/strong>\uff1a\u8bbe\u8ba1\u7ed3\u6784\u5316\u7684System Prompt\u548cHuman Prompt\uff0c\u660e\u786e\u8981\u6c42\u6a21\u578b\u57fa\u4e8e\u68c0\u7d22\u5185\u5bb9\u4f5c\u7b54\u3002<\/li>\n<\/ul>\n<h2>LangChain RAG\u7cfb\u7edf\u7684\u663e\u8457\u4f18\u52bf<\/h2>\n<p>\u76f8\u8f83\u4e8e\u4f20\u7edf\u5fae\u8c03\u6a21\u578b\uff0cRAG\u7cfb\u7edf\u5177\u5907\u4e09\u5927\u6838\u5fc3\u4f18\u52bf\uff1a<strong>\u5b9e\u65f6\u6027<\/strong>\u2014\u2014\u53ea\u9700\u66f4\u65b0\u77e5\u8bc6\u5e93\u5373\u53ef\u540c\u6b65\u6700\u65b0\u4fe1\u606f\uff0c\u65e0\u9700\u91cd\u65b0\u8bad\u7ec3\uff1b<strong>\u53ef\u89e3\u91ca\u6027<\/strong>\u2014\u2014\u56de\u7b54\u53ef\u6eaf\u6e90\u81f3\u5177\u4f53\u6587\u6863\u7247\u6bb5\uff0c\u4fbf\u4e8e\u5ba1\u8ba1\u4e0e\u8c03\u8bd5\uff1b<strong>\u4f4e\u6210\u672c<\/strong>\u2014\u2014\u4e2d\u5c0f\u89c4\u6a21\u4f01\u4e1a\u65e0\u9700\u9ad8\u6602\u7b97\u529b\u5373\u53ef\u62e5\u6709\u4e13\u4e1a\u7ea7\u95ee\u7b54\u80fd\u529b\u3002\u76ee\u524d\uff0cLangChain\u793e\u533a\u5df2\u63d0\u4f9b\u5b8c\u6574\u7684RAG\u914d\u7f6e\u793a\u4f8b\uff0c\u5f00\u53d1\u8005\u53ef\u5feb\u901f\u96c6\u6210\u81f3\u73b0\u6709\u5e94\u7528\u3002<\/p>\n<h3>\u5178\u578b\u5e94\u7528\u573a\u666f<\/h3>\n<ul>\n<li><strong>\u4f01\u4e1a\u77e5\u8bc6\u5e93\u95ee\u7b54<\/strong>\uff1a\u5458\u5de5\u53ef\u81ea\u7136\u8bed\u8a00\u67e5\u8be2\u5185\u90e8\u89c4\u7ae0\u5236\u5ea6\u3001\u4ea7\u54c1\u624b\u518c\u3002<\/li>\n<li><strong>\u5b66\u672f\u79d1\u7814\u8f85\u52a9<\/strong>\uff1a\u5feb\u901f\u68c0\u7d22\u8bba\u6587\u4e2d\u7684\u5b9e\u9a8c\u65b9\u6cd5\u3001\u6570\u636e\u7ed3\u679c\u3002<\/li>\n<li><strong>\u5ba2\u6237\u670d\u52a1<\/strong>\uff1a\u57fa\u4e8e\u4ea7\u54c1\u6587\u6863\u751f\u6210\u7cbe\u51c6\u7684\u552e\u540e\u56de\u7b54\u3002<\/li>\n<li><strong>\u6cd5\u5f8b\u4e0e\u533b\u7597\u54a8\u8be2<\/strong>\uff1a\u5f15\u7528\u6743\u5a01\u6cd5\u89c4\u6216\u4e34\u5e8a\u6307\u5357\uff0c\u786e\u4fdd\u56de\u7b54\u5408\u89c4\u5b89\u5168\u3002<\/li>\n<\/ul>\n<h2>\u5982\u4f55\u5feb\u901f\u914d\u7f6eLangChain RAG\u7cfb\u7edf<\/h2>\n<p>\u4ee5\u4e0b\u4e3a\u57fa\u4e8eLangChain Python\u5e93\u7684\u57fa\u7840\u914d\u7f6e\u6b65\u9aa4\uff08\u793a\u4f8b\u4f7f\u7528OpenAI + Chroma\uff09\uff1a<\/p>\n<p>\u7b2c\u4e00\u6b65\uff1a\u5b89\u88c5\u4f9d\u8d56 <code>pip install langchain openai chromadb tiktoken<\/code>\uff1b\u7b2c\u4e8c\u6b65\uff1a\u521d\u59cb\u5316\u6587\u6863\u52a0\u8f7d\u5668\uff0c\u4f7f\u7528<code>from langchain.document_loaders import TextLoader<\/code>\u52a0\u8f7d\u672c\u5730\u6587\u4ef6\uff1b\u7b2c\u4e09\u6b65\uff1a\u521b\u5efa\u6587\u672c\u5206\u5272\u5668 <code>RecursiveCharacterTextSplitter(chunk_size=500, chunk_overlap=50)<\/code>\uff1b\u7b2c\u56db\u6b65\uff1a\u6784\u5efa\u5411\u91cf\u5b58\u50a8 <code>vectorstore = Chroma.from_documents(docs, embedding_model)<\/code>\uff1b\u7b2c\u4e94\u6b65\uff1a\u521b\u5efa\u68c0\u7d22\u589e\u5f3a\u94fe <code>chain = RetrievalQA.from_chain_type(llm, retriever=vectorstore.as_retriever())<\/code>\uff1b\u7b2c\u516d\u6b65\uff1a\u8c03\u7528<code>chain.run(question)<\/code>\u83b7\u53d6\u7b54\u6848\u3002\u5b98\u65b9\u6587\u6863\u4e2d\u63d0\u4f9b\u4e86\u66f4\u8be6\u7ec6\u7684\u53c2\u6570\u8c03\u4f18\u6307\u5357\uff0c\u5efa\u8bae\u53c2\u8003<a href=\"https:\/\/python.langchain.com\/docs\/tutorials\/rag\/\" target=\"_blank\">LangChain RAG\u6559\u7a0b<\/a>\u8fdb\u884c\u6df1\u5165\u5b66\u4e60\u3002<\/p>\n<h3>\u6ce8\u610f\u4e8b\u9879\u4e0e\u6700\u4f73\u5b9e\u8df5<\/h3>\n<p>\u914d\u7f6e\u65f6\u9700\u6ce8\u610f\uff1a\u5411\u91cf\u7ef4\u5ea6\u4e0e\u5d4c\u5165\u6a21\u578b\u7684\u4e00\u81f4\u6027\uff1b\u68c0\u7d22Top-K\u503c\u4e0d\u5b9c\u8fc7\u5927\u4ee5\u514d\u8d85\u51faLLM\u4e0a\u4e0b\u6587\u7a97\u53e3\uff1b\u5efa\u8bae\u7ed3\u5408HyDE\uff08\u5047\u8bbe\u6587\u6863\u5d4c\u5165\uff09\u6280\u672f\u63d0\u5347\u68c0\u7d22\u76f8\u5173\u6027\u3002\u6b64\u5916\uff0c\u5b9a\u671f\u66f4\u65b0\u77e5\u8bc6\u5e93\u5e76\u76d1\u63a7\u68c0\u7d22\u8d28\u91cf\uff0c\u53ef\u914d\u5408LangSmith\u8fdb\u884c\u8ffd\u8e2a\u3002<\/p>\n<h3>\u6700\u65b0\u70ed\u70b9\u65b0\u95fb\uff1a\u4e2d\u56fd\u6210\u529f\u53d1\u5c04\u536b\u661f\u4e92\u8054\u7f51\u6280\u672f\u8bd5\u9a8c\u536b\u661f<\/h3>\n<p>\u3010\u6807\u9898\u3011\u4e2d\u56fd\u6210\u529f\u53d1\u5c04\u536b\u661f\u4e92\u8054\u7f51\u6280\u672f\u8bd5\u9a8c\u536b\u661f\uff0c\u52a0\u901f\u5929\u5730\u4e00\u4f53\u5316\u7f51\u7edc\u5efa\u8bbe<br \/>\u3010\u5206\u7c7b\u3011\u79d1\u6280<br \/>\u3010\u6b63\u6587\u3011\u636e\u592e\u89c6\u65b0\u95fb\u62a5\u9053\uff0c\u5317\u4eac\u65f6\u95f42025\u5e743\u670818\u65e5\uff0c\u6211\u56fd\u5728\u9152\u6cc9\u536b\u661f\u53d1\u5c04\u4e2d\u5fc3\u4f7f\u7528\u957f\u5f81\u4e8c\u53f7\u4e01\u8fd0\u8f7d\u706b\u7bad\uff0c\u6210\u529f\u5c06\u536b\u661f\u4e92\u8054\u7f51\u6280\u672f\u8bd5\u9a8c\u536b\u661f\u9001\u5165\u9884\u5b9a\u8f68\u9053\u3002\u6b64\u6b21\u53d1\u5c04\u6807\u5fd7\u7740\u4e2d\u56fd\u5728\u4f4e\u8f68\u536b\u661f\u901a\u4fe1\u9886\u57df\u8fc8\u51fa\u5173\u952e\u4e00\u6b65\uff0c\u5c06\u4e3a\u504f\u8fdc\u5730\u533a\u63d0\u4f9b\u9ad8\u901f\u5bbd\u5e26\u670d\u52a1\uff0c\u5e76\u63a8\u52a86G\u6280\u672f\u7814\u53d1\u3002\u536b\u661f\u4e92\u8054\u7f51\u4f5c\u4e3a\u65b0\u4e00\u4ee3\u4fe1\u606f\u57fa\u7840\u8bbe\u65bd\uff0c\u6709\u671b\u4e0e\u5730\u97625G\/6G\u7f51\u7edc\u878d\u5408\uff0c\u5b9e\u73b0\u5168\u7403\u65e0\u7f1d\u8986\u76d6\u3002\u76f8\u5173\u4f01\u4e1a\u5df2\u52a0\u901f\u5e03\u5c40\u7ec8\u7aef\u8bbe\u5907\u4e0e\u5730\u9762\u57fa\u7ad9\u5efa\u8bbe\u3002<br \/>\u3010\u6765\u6e90\u3011<a href=\"https:\/\/news.cctv.com\/2025\/03\/18\/xxxxx\" target=\"_blank\">\u592e\u89c6\u65b0\u95fb<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u4eba\u5de5\u667a\u80fd\u4e0e\u81ea\u7136\u8bed\u8a00\u5904\u7406\u9886\u57df\uff0cLangChain RAG\u7cfb\u7edf\uff08\u68c0\u7d22\u589e\u5f3a\u751f\u6210\uff09\u6b63\u6210\u4e3a\u6784\u5efa\u667a\u80fd\u95ee\u7b54\u3001\u6587\u6863\u5206\u6790\u7b49\u5e94\u7528 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[26866,10183,9889,10309,10298],"class_list":["post-23912","post","type-post","status-publish","format-standard","hentry","category-4","tag-langchain-rag","tag-10183","tag-9889","tag-10309","tag-10298"],"_links":{"self":[{"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/posts\/23912","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ab123.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=23912"}],"version-history":[{"count":1,"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/posts\/23912\/revisions"}],"predecessor-version":[{"id":23913,"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/posts\/23912\/revisions\/23913"}],"wp:attachment":[{"href":"https:\/\/ab123.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=23912"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ab123.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=23912"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ab123.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=23912"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}