{"id":115420,"date":"2026-10-12T05:32:55","date_gmt":"2026-10-11T21:32:55","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/115420.html"},"modified":"2026-10-12T05:32:55","modified_gmt":"2026-10-11T21:32:55","slug":"langchain-agentic-rag%ef%bc%9a%e8%ae%a9-agent-%e8%87%aa%e5%b7%b1%e5%86%b3%e5%ae%9a%e8%a6%81%e4%b8%8d%e8%a6%81%e6%a3%80%e7%b4%a2%e3%80%81%e6%a3%80%e7%b4%a2%e5%87%a0%e6%ac%a1","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/115420.html","title":{"rendered":"LangChain Agentic RAG\uff1a\u8ba9 Agent \u81ea\u5df1\u51b3\u5b9a\u8981\u4e0d\u8981\u68c0\u7d22\u3001\u68c0\u7d22\u51e0\u6b21"},"content":{"rendered":"<p>  \u4e2a\u4eba\u4e3b\u9875&#xff1a;<br \/>\n &gt; for_ever_love__ &lt;&#xff08;\u6b22\u8fce\u5404\u4f4d\u5927\u4f6c\u8385\u4e34&#x1f60a;&#xff09; <\/p>\n<p>  \u5176\u4ed6\u680f\u76ee:<br \/>\n &gt; \u5927\u6a21\u578b\u5f00\u53d1\u4ece0\u52301 &lt; <\/p>\n<p>  \u5176\u4ed6\u680f\u76ee:<br \/>\n &gt; iOS\u9879\u76ee\u603b\u7ed3\u5927\u5168 &lt; <\/p>\n<p>  \u5176\u4ed6\u680f\u76ee:<br \/>\n &gt; \u6211\u60f3\u5b66python\u4e86 &lt; <\/p>\n<p>  \u5176\u4ed6\u680f\u76ee:<br \/>\n &gt; iOS UI &lt; <\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>LangChain Agentic RAG&#xff1a;\u8ba9 Agent \u81ea\u5df1\u51b3\u5b9a\u8981\u4e0d\u8981\u68c0\u7d22\u3001\u68c0\u7d22\u51e0\u6b21<\/li>\n<li>\n<ul>\n<li>\u4e00\u3001\u4e24\u79cd RAG \u7684\u7ed3\u6784\u5bf9\u6bd4<\/li>\n<li>\u4e8c\u3001\u6700\u5c0f\u5b9e\u73b0&#xff1a;\u628a retriever \u5305\u6210\u5de5\u5177<\/li>\n<li>\u4e09\u3001\u8fdb\u9636&#xff1a;\u52a0\u4e0a&#034;\u53cd\u601d&#034;\u8282\u70b9<\/li>\n<li>\u56db\u3001\u4ec0\u4e48\u65f6\u5019\u8be5\u7528 Agentic RAG<\/li>\n<li>\u4e94\u3001\u6210\u672c\u5bf9\u6bd4<\/li>\n<li>\u516d\u3001\u8ba9 Agent \u77e5\u9053&#034;\u68c0\u7d22\u4e0d\u5230\u5c31\u522b\u786c\u627e&#034;<\/li>\n<li>\u4e03\u3001\u5b8c\u6574\u793a\u4f8b&#xff1a;\u5e26\u53cd\u601d\u7684\u5ba2\u670d Agent<\/li>\n<li>\u516b\u3001\u5e38\u89c1\u5751<\/li>\n<li>\u4e5d\u3001\u5c0f\u7ed3<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>LangChain Agentic RAG&#xff1a;\u8ba9 Agent \u81ea\u5df1\u51b3\u5b9a\u8981\u4e0d\u8981\u68c0\u7d22\u3001\u68c0\u7d22\u51e0\u6b21<\/h2>\n<p>\u4f20\u7edf RAG \u662f&#034;\u95ee\u4e00\u6b21&#xff0c;\u68c0\u7d22\u4e00\u6b21&#xff0c;\u7b54\u4e00\u6b21&#034;\u7684\u56fa\u5b9a\u6d41\u7a0b\u3002 \u4f46\u5f88\u591a\u95ee\u9898\u6839\u672c\u4e0d\u662f\u4e00\u6b21\u68c0\u7d22\u80fd\u89e3\u51b3\u7684&#xff1a; \u201c\u5bf9\u6bd4\u4e00\u4e0b 2023 \u548c 2024 \u5e74\u7684\u5dee\u65c5\u5236\u5ea6\u6709\u4ec0\u4e48\u53d8\u5316\u201d\u2014\u2014 \u8fd9\u9700\u8981\u68c0\u7d22\u4e24\u6b21&#xff0c;\u8fd8\u5f97\u5206\u522b\u5b9a\u4f4d\u4e24\u4e2a\u7248\u672c\u3002<\/p>\n<p>Agentic RAG \u628a&#034;\u68c0\u7d22&#034;\u53d8\u6210\u4e00\u4e2a\u5de5\u5177&#xff0c; \u8ba9 Agent \u81ea\u5df1\u51b3\u5b9a&#xff1a;\u8981\u4e0d\u8981\u67e5\u3001\u67e5\u4ec0\u4e48\u3001\u67e5\u51e0\u6b21\u3001\u591f\u4e86\u6ca1\u6709\u3002<\/p>\n<h3>\u4e00\u3001\u4e24\u79cd RAG \u7684\u7ed3\u6784\u5bf9\u6bd4<\/h3>\n<p>\u4f20\u7edf RAG&#xff08;\u56fa\u5b9a\u94fe&#xff09;&#xff1a;<\/p>\n<p>\u95ee\u9898 \u2192 \u68c0\u7d22 \u2192 \u62fc prompt \u2192 \u751f\u6210 \u2192 \u7b54\u6848<\/p>\n<p>\u6d41\u7a0b\u5199\u6b7b&#xff0c;\u65e0\u8bba\u4ec0\u4e48\u95ee\u9898\u90fd\u8d70\u4e00\u904d\u3002<\/p>\n<p>Agentic RAG&#xff1a;<\/p>\n<p>\u95ee\u9898 \u2192 [Agent \u601d\u8003] \u2192 \u9700\u8981\u67e5\u5417&#xff1f;<br \/>\n          \u251c\u2500 \u4e0d\u9700\u8981 \u2192 \u76f4\u63a5\u56de\u7b54&#xff08;\u4f60\u597d\u3001\u8c22\u8c22\u8fd9\u7c7b&#xff09;<br \/>\n          \u251c\u2500 \u9700\u8981 \u2192 \u8c03\u7528\u68c0\u7d22\u5de5\u5177 \u2192 \u7ed3\u679c\u6ee1\u610f\u5417&#xff1f;<br \/>\n          \u2502           \u251c\u2500 \u4e0d\u6ee1\u610f \u2192 \u6362\u4e2a\u67e5\u8be2\u518d\u67e5<br \/>\n          \u2502           \u2514\u2500 \u6ee1\u610f \u2192 \u751f\u6210\u7b54\u6848<\/p>\n<p>\u6838\u5fc3\u533a\u522b&#xff1a;\u68c0\u7d22\u53d8\u6210\u4e86 Agent \u53ef\u652f\u914d\u7684\u4e00\u4e2a\u52a8\u4f5c\u3002<\/p>\n<h3>\u4e8c\u3001\u6700\u5c0f\u5b9e\u73b0&#xff1a;\u628a retriever \u5305\u6210\u5de5\u5177<\/h3>\n<p><span class=\"token keyword\">from<\/span> langchain_core<span class=\"token punctuation\">.<\/span>tools <span class=\"token keyword\">import<\/span> tool<br \/>\n<span class=\"token keyword\">from<\/span> langgraph<span class=\"token punctuation\">.<\/span>prebuilt <span class=\"token keyword\">import<\/span> create_react_agent<br \/>\n<span class=\"token keyword\">from<\/span> langchain_openai <span class=\"token keyword\">import<\/span> ChatOpenAI<\/p>\n<p><span class=\"token decorator annotation punctuation\">&#064;tool<\/span><br \/>\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">search_knowledge_base<\/span><span class=\"token punctuation\">(<\/span>query<span class=\"token punctuation\">:<\/span> <span class=\"token builtin\">str<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token builtin\">str<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token triple-quoted-string string\">&#034;&#034;&#034;\u5728\u4f01\u4e1a\u77e5\u8bc6\u5e93\u4e2d\u641c\u7d22\u76f8\u5173\u5185\u5bb9\u3002<\/p>\n<p>    \u5f53\u9700\u8981\u67e5\u627e\u516c\u53f8\u5236\u5ea6\u3001\u6d41\u7a0b\u3001\u4ea7\u54c1\u89c4\u683c\u3001\u5386\u53f2\u8bb0\u5f55\u7b49\u4fe1\u606f\u65f6\u4f7f\u7528\u3002<br \/>\n    query \u5e94\u8be5\u662f\u7b80\u6d01\u7684\u68c0\u7d22\u8bcd&#xff0c;\u4e0d\u8981\u5199\u5b8c\u6574\u53e5\u5b50\u3002<br \/>\n    \u5982\u679c\u6ca1\u627e\u5230\u6709\u7528\u5185\u5bb9&#xff0c;\u8fd4\u56de\u7a7a\u5b57\u7b26\u4e32\u5373\u53ef\u3002<br \/>\n    &#034;&#034;&#034;<\/span><br \/>\n    docs <span class=\"token operator\">&#061;<\/span> retriever<span class=\"token punctuation\">.<\/span>invoke<span class=\"token punctuation\">(<\/span>query<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token keyword\">not<\/span> docs<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;\u6ca1\u6709\u627e\u5230\u76f8\u5173\u5185\u5bb9\u3002&#034;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;\\\\n\\\\n&#034;<\/span><span class=\"token punctuation\">.<\/span>join<span class=\"token punctuation\">(<\/span><br \/>\n        <span class=\"token string-interpolation\"><span class=\"token string\">f&#034;[<\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span>i<span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">] <\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span>d<span class=\"token punctuation\">.<\/span>page_content<span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span> <span class=\"token keyword\">for<\/span> i<span class=\"token punctuation\">,<\/span> d <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">enumerate<\/span><span class=\"token punctuation\">(<\/span>docs<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">)<\/span><\/p>\n<p>llm <span class=\"token operator\">&#061;<\/span> ChatOpenAI<span class=\"token punctuation\">(<\/span>model<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;gpt-4o-mini&#034;<\/span><span class=\"token punctuation\">,<\/span> temperature<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\nagent <span class=\"token operator\">&#061;<\/span> create_react_agent<span class=\"token punctuation\">(<\/span><br \/>\n    llm<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">[<\/span>search_knowledge_base<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    prompt<span class=\"token operator\">&#061;<\/span><span class=\"token triple-quoted-string string\">&#034;&#034;&#034;\u4f60\u662f\u4f01\u4e1a\u77e5\u8bc6\u5e93\u52a9\u624b\u3002<\/p>\n<p>\u89c4\u5219&#xff1a;<br \/>\n1. \u9700\u8981\u67e5\u8d44\u6599\u65f6\u5fc5\u987b\u8c03\u7528 search_knowledge_base&#xff0c;\u4e0d\u8981\u51ed\u8bb0\u5fc6\u56de\u7b54&#xff1b;<br \/>\n2. \u53ef\u4ee5\u591a\u6b21\u8c03\u7528&#xff0c;\u6bcf\u6b21\u7528\u4e0d\u540c\u7684\u68c0\u7d22\u8bcd&#xff1b;<br \/>\n3. \u68c0\u7d22\u4e0d\u5230\u65f6\u5c31\u8bf4&#034;\u6ca1\u6709\u627e\u5230\u76f8\u5173\u4fe1\u606f&#034;&#xff0c;\u4e0d\u8981\u7f16\u9020&#xff1b;<br \/>\n4. \u56de\u7b54\u65f6\u5728\u53e5\u672b\u6807\u6ce8 [\u7f16\u53f7]\u3002<br \/>\n&#034;&#034;&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p>result <span class=\"token operator\">&#061;<\/span> agent<span class=\"token punctuation\">.<\/span>invoke<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;messages&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;user&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u5bf9\u6bd4 2023 \u548c 2024 \u5e74\u7684\u5dee\u65c5\u5236\u5ea6\u53d8\u5316&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>Agent \u4f1a\u81ea\u5df1\u8dd1\u51fa\u8fd9\u6837\u7684\u8f68\u8ff9&#xff1a;<\/p>\n<p>&#x1f914; \u9700\u8981\u5206\u522b\u67e5\u4e24\u4e2a\u7248\u672c<br \/>\n&#x1f527; search_knowledge_base(&#034;2023 \u5dee\u65c5\u5236\u5ea6&#034;)<br \/>\n&#x1f4c4; [1] 2023\u7248&#xff1a;\u4e00\u7ebf\u57ce\u5e02 500 \u5143\u2026<br \/>\n&#x1f914; \u8fd8\u9700\u8981 2024 \u7248<br \/>\n&#x1f527; search_knowledge_base(&#034;2024 \u5dee\u65c5\u5236\u5ea6&#034;)<br \/>\n&#x1f4c4; [1] 2024\u7248&#xff1a;\u4e00\u7ebf\u57ce\u5e02 600 \u5143\u2026<br \/>\n&#x1f914; \u4fe1\u606f\u591f\u4e86<br \/>\n&#x1f4ac; \u4e3b\u8981\u53d8\u5316&#xff1a;\u4e00\u7ebf\u57ce\u5e02\u4ece 500 \u5143\u4e0a\u8c03\u5230 600 \u5143[2]\u2026<\/p>\n<p>\u4f20\u7edf RAG \u505a\u4e0d\u5230\u8fd9\u4e00\u70b9\u2014\u2014\u5b83\u53ea\u6709\u4e00\u6b21\u68c0\u7d22\u673a\u4f1a\u3002<\/p>\n<h3>\u4e09\u3001\u8fdb\u9636&#xff1a;\u52a0\u4e0a&#034;\u53cd\u601d&#034;\u8282\u70b9<\/h3>\n<p>\u8ba9 Agent \u663e\u5f0f\u5224\u65ad&#034;\u68c0\u7d22\u5230\u7684\u5185\u5bb9\u591f\u4e0d\u591f&#034;&#xff1a;<\/p>\n<p><span class=\"token keyword\">from<\/span> typing <span class=\"token keyword\">import<\/span> TypedDict<span class=\"token punctuation\">,<\/span> Annotated<span class=\"token punctuation\">,<\/span> Literal<br \/>\n<span class=\"token keyword\">from<\/span> langgraph<span class=\"token punctuation\">.<\/span>graph <span class=\"token keyword\">import<\/span> StateGraph<span class=\"token punctuation\">,<\/span> START<span class=\"token punctuation\">,<\/span> END<br \/>\n<span class=\"token keyword\">from<\/span> langgraph<span class=\"token punctuation\">.<\/span>graph<span class=\"token punctuation\">.<\/span>message <span class=\"token keyword\">import<\/span> add_messages<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">State<\/span><span class=\"token punctuation\">(<\/span>TypedDict<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    messages<span class=\"token punctuation\">:<\/span> Annotated<span class=\"token punctuation\">[<\/span><span class=\"token builtin\">list<\/span><span class=\"token punctuation\">,<\/span> add_messages<span class=\"token punctuation\">]<\/span><br \/>\n    documents<span class=\"token punctuation\">:<\/span> <span class=\"token builtin\">list<\/span><br \/>\n    retries<span class=\"token punctuation\">:<\/span> <span class=\"token builtin\">int<\/span><\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">retrieve<\/span><span class=\"token punctuation\">(<\/span>state<span class=\"token punctuation\">:<\/span> State<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    question <span class=\"token operator\">&#061;<\/span> state<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;messages&#034;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>content<br \/>\n    docs <span class=\"token operator\">&#061;<\/span> retriever<span class=\"token punctuation\">.<\/span>invoke<span class=\"token punctuation\">(<\/span>question<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;documents&#034;<\/span><span class=\"token punctuation\">:<\/span> docs<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">grade_documents<\/span><span class=\"token punctuation\">(<\/span>state<span class=\"token punctuation\">:<\/span> State<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&gt;<\/span> Literal<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;generate&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;rewrite&#034;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token triple-quoted-string string\">&#034;&#034;&#034;\u5224\u65ad\u68c0\u7d22\u7ed3\u679c\u662f\u5426\u548c\u95ee\u9898\u76f8\u5173&#034;&#034;&#034;<\/span><br \/>\n    docs <span class=\"token operator\">&#061;<\/span> state<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;documents&#034;<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token keyword\">not<\/span> docs<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;rewrite&#034;<\/span><\/p>\n<p>    <span class=\"token comment\"># \u8ba9 LLM \u6253\u5206<\/span><br \/>\n    scores <span class=\"token operator\">&#061;<\/span> grade_chain<span class=\"token punctuation\">.<\/span>batch<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;question&#034;<\/span><span class=\"token punctuation\">:<\/span> state<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;messages&#034;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>content<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;doc&#034;<\/span><span class=\"token punctuation\">:<\/span> d<span class=\"token punctuation\">.<\/span>page_content<span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> d <span class=\"token keyword\">in<\/span> docs<br \/>\n    <span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> config<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;max_concurrency&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    relevant <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>d <span class=\"token keyword\">for<\/span> d<span class=\"token punctuation\">,<\/span> s <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">zip<\/span><span class=\"token punctuation\">(<\/span>docs<span class=\"token punctuation\">,<\/span> scores<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">if<\/span> s <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;yes&#034;<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>relevant<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;generate&#034;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> state<span class=\"token punctuation\">.<\/span>get<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;retries&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;generate&#034;<\/span>      <span class=\"token comment\"># \u91cd\u8bd5\u591f\u4e86&#xff0c;\u786c\u7740\u5934\u76ae\u7b54<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;rewrite&#034;<\/span><\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">rewrite_query<\/span><span class=\"token punctuation\">(<\/span>state<span class=\"token punctuation\">:<\/span> State<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token triple-quoted-string string\">&#034;&#034;&#034;\u6362\u4e2a\u8bf4\u6cd5\u518d\u68c0\u7d22&#034;&#034;&#034;<\/span><br \/>\n    new_q <span class=\"token operator\">&#061;<\/span> rewrite_chain<span class=\"token punctuation\">.<\/span>invoke<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token string\">&#034;question&#034;<\/span><span class=\"token punctuation\">:<\/span> state<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;messages&#034;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>content<br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;messages&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span>HumanMessage<span class=\"token punctuation\">(<\/span>new_q<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token string\">&#034;retries&#034;<\/span><span class=\"token punctuation\">:<\/span> state<span class=\"token punctuation\">.<\/span>get<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;retries&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">generate<\/span><span class=\"token punctuation\">(<\/span>state<span class=\"token punctuation\">:<\/span> State<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    ctx <span class=\"token operator\">&#061;<\/span> format_docs<span class=\"token punctuation\">(<\/span>state<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;documents&#034;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    ans <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>prompt <span class=\"token operator\">|<\/span> llm <span class=\"token operator\">|<\/span> StrOutputParser<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>invoke<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token string\">&#034;context&#034;<\/span><span class=\"token punctuation\">:<\/span> ctx<span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token string\">&#034;question&#034;<\/span><span class=\"token punctuation\">:<\/span> state<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;messages&#034;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>content<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;messages&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span>AIMessage<span class=\"token punctuation\">(<\/span>ans<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<p>graph <span class=\"token operator\">&#061;<\/span> StateGraph<span class=\"token punctuation\">(<\/span>State<span class=\"token punctuation\">)<\/span><br \/>\ngraph<span class=\"token punctuation\">.<\/span>add_node<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;retrieve&#034;<\/span><span class=\"token punctuation\">,<\/span> retrieve<span class=\"token punctuation\">)<\/span><br \/>\ngraph<span class=\"token punctuation\">.<\/span>add_node<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;rewrite&#034;<\/span><span class=\"token punctuation\">,<\/span> rewrite_query<span class=\"token punctuation\">)<\/span><br \/>\ngraph<span class=\"token punctuation\">.<\/span>add_node<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;generate&#034;<\/span><span class=\"token punctuation\">,<\/span> generate<span class=\"token punctuation\">)<\/span><\/p>\n<p>graph<span class=\"token punctuation\">.<\/span>add_edge<span class=\"token punctuation\">(<\/span>START<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;retrieve&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\ngraph<span class=\"token punctuation\">.<\/span>add_conditional_edges<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;retrieve&#034;<\/span><span class=\"token punctuation\">,<\/span> grade_documents<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token string\">&#034;generate&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token string\">&#034;generate&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token string\">&#034;rewrite&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token string\">&#034;rewrite&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\ngraph<span class=\"token punctuation\">.<\/span>add_edge<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;rewrite&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;retrieve&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\ngraph<span class=\"token punctuation\">.<\/span>add_edge<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;generate&#034;<\/span><span class=\"token punctuation\">,<\/span> END<span class=\"token punctuation\">)<\/span><\/p>\n<p>app <span class=\"token operator\">&#061;<\/span> graph<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">compile<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u4e09\u4e2a\u5173\u952e\u8282\u70b9&#xff1a;<\/p>\n<table>\n<tr>\u8282\u70b9\u4f5c\u7528<\/tr>\n<tbody>\n<tr>\n<td>retrieve<\/td>\n<td>\u68c0\u7d22<\/td>\n<\/tr>\n<tr>\n<td>grade_documents<\/td>\n<td>\u5224\u65ad\u76f8\u5173\u6027&#xff0c;\u591f\u5c31\u751f\u6210&#xff0c;\u4e0d\u591f\u5c31\u6539\u5199\u91cd\u67e5<\/td>\n<\/tr>\n<tr>\n<td>rewrite<\/td>\n<td>\u6362\u4e2a\u67e5\u8be2\u8bcd&#xff0c;\u56de\u5230 retrieve<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>retries \u4e0a\u9650\u5f88\u91cd\u8981&#xff0c;\u5426\u5219\u4f1a\u65e0\u9650\u5faa\u73af\u3002<\/p>\n<h3>\u56db\u3001\u4ec0\u4e48\u65f6\u5019\u8be5\u7528 Agentic RAG<\/h3>\n<table>\n<tr>\u573a\u666f\u4f20\u7edf RAGAgentic RAG<\/tr>\n<tbody>\n<tr>\n<td>\u5355\u8df3\u95ee\u7b54&#xff08;\u201c\u62a5\u9500\u6807\u51c6\u591a\u5c11\u201d&#xff09;<\/td>\n<td>\u2705 \u66f4\u5feb\u66f4\u7701<\/td>\n<td>\u8fc7\u5ea6\u8bbe\u8ba1<\/td>\n<\/tr>\n<tr>\n<td>\u591a\u8df3\u95ee\u7b54&#xff08;\u201cA \u548c B \u6709\u4ec0\u4e48\u533a\u522b\u201d&#xff09;<\/td>\n<td>\u274c<\/td>\n<td>\u2705<\/td>\n<\/tr>\n<tr>\n<td>\u9700\u8981\u8de8\u591a\u4e2a\u6570\u636e\u6e90<\/td>\n<td>\u274c<\/td>\n<td>\u2705<\/td>\n<\/tr>\n<tr>\n<td>\u9700\u8981&#034;\u5148\u67e5\u518d\u5224\u65ad\u518d\u67e5&#034;<\/td>\n<td>\u274c<\/td>\n<td>\u2705<\/td>\n<\/tr>\n<tr>\n<td>\u7b80\u5355\u95f2\u804a&#xff08;\u201c\u4f60\u597d\u201d&#xff09;<\/td>\n<td>\u6d6a\u8d39\u4e00\u6b21\u68c0\u7d22<\/td>\n<td>\u2705 Agent \u4f1a\u8df3\u8fc7\u68c0\u7d22<\/td>\n<\/tr>\n<tr>\n<td>\u5ef6\u8fdf\u8981\u6c42 &lt; 1 \u79d2<\/td>\n<td>\u2705<\/td>\n<td>\u274c \u81f3\u5c11\u591a\u4e00\u8f6e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5224\u65ad\u4f9d\u636e&#xff1a;\u4f60\u7684\u95ee\u9898\u662f\u5426\u9700\u8981&#034;\u591a\u6b65&#034;\u3002 \u5982\u679c 90% \u7684\u95ee\u9898\u90fd\u662f\u5355\u8df3\u95ee\u7b54&#xff0c;\u522b\u4e0a Agentic RAG&#xff0c; \u90a3 10% \u5355\u72ec\u5904\u7406\u5c31\u884c\u3002<\/p>\n<h3>\u4e94\u3001\u6210\u672c\u5bf9\u6bd4<\/h3>\n<table>\n<tr>\u4f20\u7edf RAGAgentic RAG<\/tr>\n<tbody>\n<tr>\n<td>LLM \u8c03\u7528<\/td>\n<td>1 \u6b21&#xff08;\u751f\u6210&#xff09;<\/td>\n<td>2~4 \u6b21&#xff08;\u601d\u8003 &#043; \u68c0\u7d22\u5224\u65ad &#043; \u751f\u6210&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u68c0\u7d22<\/td>\n<td>1 \u6b21<\/td>\n<td>1~3 \u6b21<\/td>\n<\/tr>\n<tr>\n<td>\u5ef6\u8fdf<\/td>\n<td>2~3 \u79d2<\/td>\n<td>5~15 \u79d2<\/td>\n<\/tr>\n<tr>\n<td>token<\/td>\n<td>1 \u4efd\u4e0a\u4e0b\u6587<\/td>\n<td>\u591a\u4efd\u4e0a\u4e0b\u6587\u7d2f\u79ef<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Agentic RAG \u660e\u663e\u66f4\u8d35\u66f4\u6162\u3002 \u6240\u4ee5\u53ea\u5728\u9700\u8981\u591a\u8df3\u7684\u573a\u666f\u7528\u3002<\/p>\n<p>\u4e00\u4e2a\u6298\u4e2d\u65b9\u6848&#xff1a;\u8def\u7531\u2014\u2014\u7b80\u5355\u95ee\u9898\u8d70\u4f20\u7edf\u94fe&#xff0c;\u590d\u6742\u95ee\u9898\u8d70 Agent&#xff1a;<\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">route<\/span><span class=\"token punctuation\">(<\/span>question<span class=\"token punctuation\">:<\/span> <span class=\"token builtin\">str<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> is_multi_hop<span class=\"token punctuation\">(<\/span>question<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span>      <span class=\"token comment\"># \u89c4\u5219\u6216\u8f7b\u91cf\u5206\u7c7b<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> agent<span class=\"token punctuation\">.<\/span>invoke<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;messages&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;user&#034;<\/span><span class=\"token punctuation\">,<\/span> question<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> fast_chain<span class=\"token punctuation\">.<\/span>invoke<span class=\"token punctuation\">(<\/span>question<span class=\"token punctuation\">)<\/span><\/p>\n<h3>\u516d\u3001\u8ba9 Agent \u77e5\u9053&#034;\u68c0\u7d22\u4e0d\u5230\u5c31\u522b\u786c\u627e&#034;<\/h3>\n<p>\u8fd9\u662f Agentic RAG \u6700\u5bb9\u6613\u51fa\u95ee\u9898\u7684\u5730\u65b9&#xff1a; Agent \u53ef\u80fd\u8fde\u7eed\u6362 5 \u4e2a\u67e5\u8be2\u8bcd\u53cd\u590d\u641c&#xff0c;\u6700\u540e\u8fd8\u662f\u7f16\u4e00\u4e2a\u7b54\u6848\u3002<\/p>\n<p>\u9632\u62a4\u4e09\u62db&#xff1a;<\/p>\n<p>\u2460 \u5de5\u5177\u8fd4\u56de\u660e\u786e\u7684\u7a7a\u7ed3\u679c<\/p>\n<p><span class=\"token decorator annotation punctuation\">&#064;tool<\/span><br \/>\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">search_knowledge_base<\/span><span class=\"token punctuation\">(<\/span>query<span class=\"token punctuation\">:<\/span> <span class=\"token builtin\">str<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token builtin\">str<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token triple-quoted-string string\">&#034;&#034;&#034;&#8230;&#034;&#034;&#034;<\/span><br \/>\n    docs <span class=\"token operator\">&#061;<\/span> retriever<span class=\"token punctuation\">.<\/span>invoke<span class=\"token punctuation\">(<\/span>query<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token keyword\">not<\/span> docs<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;\u77e5\u8bc6\u5e93\u4e2d\u6ca1\u6709\u627e\u5230\u76f8\u5173\u5185\u5bb9\u3002\u8bf7\u4e0d\u8981\u53cd\u590d\u91cd\u8bd5\u4e0d\u540c\u7684\u68c0\u7d22\u8bcd&#xff0c;&#034;<\/span> \\\\<br \/>\n               <span class=\"token string\">&#034;\u76f4\u63a5\u544a\u8bc9\u7528\u6237\u6ca1\u6709\u627e\u5230\u3002&#034;<\/span><br \/>\n    <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><\/p>\n<p>\u5728\u5de5\u5177\u8fd4\u56de\u503c\u91cc\u76f4\u63a5\u4e0b\u6307\u4ee4&#xff0c;\u6bd4\u5728 system prompt \u91cc\u8bf4\u66f4\u6709\u6548 &#xff08;\u56e0\u4e3a\u5b83\u51fa\u73b0\u5728\u6a21\u578b&#034;\u521a\u770b\u5230&#034;\u7684\u4f4d\u7f6e&#xff09;\u3002<\/p>\n<p>\u2461 \u9650\u5236\u6b65\u6570<\/p>\n<p>agent<span class=\"token punctuation\">.<\/span>invoke<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;messages&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> config<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;recursion_limit&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u2462 \u663e\u5f0f\u7684&#034;\u653e\u5f03&#034;\u51fa\u53e3<\/p>\n<p>prompt <span class=\"token operator\">&#061;<\/span> <span class=\"token triple-quoted-string string\">&#034;&#034;&#034;<br \/>\n&#8230;<br \/>\n4. \u5982\u679c\u4e24\u6b21\u68c0\u7d22\u90fd\u6ca1\u627e\u5230&#xff0c;\u76f4\u63a5\u56de\u7b54&#034;\u6ca1\u6709\u627e\u5230\u76f8\u5173\u4fe1\u606f&#034;&#xff0c;<br \/>\n   \u5e76\u8bf4\u660e\u5df2\u5c1d\u8bd5\u8fc7\u54ea\u4e9b\u68c0\u7d22\u8bcd\u3002\u4e0d\u8981\u7f16\u9020&#xff0c;\u4e0d\u8981\u7ee7\u7eed\u91cd\u8bd5\u3002<br \/>\n&#034;&#034;&#034;<\/span><\/p>\n<h3>\u4e03\u3001\u5b8c\u6574\u793a\u4f8b&#xff1a;\u5e26\u53cd\u601d\u7684\u5ba2\u670d Agent<\/h3>\n<p><span class=\"token keyword\">from<\/span> langchain_core<span class=\"token punctuation\">.<\/span>tools <span class=\"token keyword\">import<\/span> tool<br \/>\n<span class=\"token keyword\">from<\/span> langgraph<span class=\"token punctuation\">.<\/span>prebuilt <span class=\"token keyword\">import<\/span> create_react_agent<\/p>\n<p><span class=\"token decorator annotation punctuation\">&#064;tool<\/span><br \/>\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">search_faq<\/span><span class=\"token punctuation\">(<\/span>query<span class=\"token punctuation\">:<\/span> <span class=\"token builtin\">str<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token builtin\">str<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token triple-quoted-string string\">&#034;&#034;&#034;\u641c\u7d22\u5e38\u89c1\u95ee\u9898\u5e93\u3002\u7528\u4e8e\u67e5\u627e\u9000\u6b3e\u3001\u7269\u6d41\u3001\u53d1\u7968\u7b49\u6807\u51c6\u95ee\u9898\u7684\u7b54\u6848\u3002&#034;&#034;&#034;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token punctuation\">.<\/span>join<span class=\"token punctuation\">(<\/span>d<span class=\"token punctuation\">.<\/span>page_content <span class=\"token keyword\">for<\/span> d <span class=\"token keyword\">in<\/span> faq_retriever<span class=\"token punctuation\">.<\/span>invoke<span class=\"token punctuation\">(<\/span>query<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">or<\/span> <span class=\"token string\">&#034;\u65e0\u7ed3\u679c&#034;<\/span><\/p>\n<p><span class=\"token decorator annotation punctuation\">&#064;tool<\/span><br \/>\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">search_order<\/span><span class=\"token punctuation\">(<\/span>order_id<span class=\"token punctuation\">:<\/span> <span class=\"token builtin\">str<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token builtin\">str<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token triple-quoted-string string\">&#034;&#034;&#034;\u6839\u636e\u8ba2\u5355\u53f7\u67e5\u8be2\u8ba2\u5355\u72b6\u6001\u548c\u7269\u6d41\u3002\u8ba2\u5355\u53f7\u5f62\u5982 SO20240115\u3002&#034;&#034;&#034;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> api<span class=\"token punctuation\">.<\/span>query_order<span class=\"token punctuation\">(<\/span>order_id<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token decorator annotation punctuation\">&#064;tool<\/span><br \/>\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">escalate_to_human<\/span><span class=\"token punctuation\">(<\/span>reason<span class=\"token punctuation\">:<\/span> <span class=\"token builtin\">str<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token builtin\">str<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token triple-quoted-string string\">&#034;&#034;&#034;\u8f6c\u4eba\u5de5\u5ba2\u670d\u3002\u5f53\u65e0\u6cd5\u89e3\u51b3\u7528\u6237\u95ee\u9898&#xff0c;\u6216\u6d89\u53ca\u9000\u6b3e\/\u6295\u8bc9\u65f6\u4f7f\u7528\u3002&#034;&#034;&#034;<\/span><br \/>\n    create_ticket<span class=\"token punctuation\">(<\/span>reason<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;\u5df2\u521b\u5efa\u4eba\u5de5\u5de5\u5355&#xff0c;\u5ba2\u670d\u5c06\u5728 1 \u4e2a\u5de5\u4f5c\u65e5\u5185\u8054\u7cfb\u7528\u6237\u3002&#034;<\/span><\/p>\n<p>agent <span class=\"token operator\">&#061;<\/span> create_react_agent<span class=\"token punctuation\">(<\/span><br \/>\n    ChatOpenAI<span class=\"token punctuation\">(<\/span>model<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;gpt-4o-mini&#034;<\/span><span class=\"token punctuation\">,<\/span> temperature<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">[<\/span>search_faq<span class=\"token punctuation\">,<\/span> search_order<span class=\"token punctuation\">,<\/span> escalate_to_human<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    prompt<span class=\"token operator\">&#061;<\/span><span class=\"token triple-quoted-string string\">&#034;&#034;&#034;\u4f60\u662f\u7535\u5546\u5ba2\u670d\u52a9\u624b\u3002<\/p>\n<p>\u6d41\u7a0b&#xff1a;<br \/>\n1. \u5148\u5224\u65ad\u95ee\u9898\u7c7b\u578b&#xff1a;\u6807\u51c6\u95ee\u9898 \u2192 search_faq&#xff1b;\u5177\u4f53\u8ba2\u5355 \u2192 search_order<br \/>\n2. \u627e\u4e0d\u5230\u7b54\u6848\u65f6&#xff0c;\u6700\u591a\u518d\u6362\u4e00\u6b21\u68c0\u7d22\u8bcd<br \/>\n3. \u4ecd\u7136\u627e\u4e0d\u5230 \u2192 \u8c03\u7528 escalate_to_human \u8f6c\u4eba\u5de5<br \/>\n4. \u6d89\u53ca\u9000\u6b3e\u3001\u6295\u8bc9\u7684&#xff0c;\u76f4\u63a5\u8f6c\u4eba\u5de5&#xff0c;\u4e0d\u8981\u81ea\u884c\u5904\u7406<\/p>\n<p>\u4e0d\u8981\u7f16\u9020\u7269\u6d41\u4fe1\u606f\u3001\u9000\u6b3e\u91d1\u989d\u3001\u653f\u7b56\u6761\u6b3e\u3002<br \/>\n&#034;&#034;&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">for<\/span> chunk <span class=\"token keyword\">in<\/span> agent<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;messages&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;user&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u6211\u7684\u8ba2\u5355 SO20240115 \u4ec0\u4e48\u65f6\u5019\u5230&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    stream_mode<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;values&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    config<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;recursion_limit&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><\/p>\n<p>\u7ed9 Agent \u4e00\u4e2a&#034;\u8f6c\u4eba\u5de5&#034;\u7684\u5de5\u5177\u662f\u5f88\u5b9e\u7528\u7684\u8bbe\u8ba1\u2014\u2014 \u5b83\u7ed9\u6a21\u578b\u4e00\u4e2a\u660e\u786e\u7684&#034;\u6211\u641e\u4e0d\u5b9a&#034;\u7684\u51fa\u53e3&#xff0c;\u6bd4\u8ba9\u5b83\u786c\u7b54\u597d\u5f97\u591a\u3002<\/p>\n<h3>\u516b\u3001\u5e38\u89c1\u5751<\/h3>\n<table>\n<tr>\u73b0\u8c61\u539f\u56e0\u89e3\u6cd5<\/tr>\n<tbody>\n<tr>\n<td>\u53cd\u590d\u68c0\u7d22\u540c\u4e00\u4e2a\u610f\u601d<\/td>\n<td>\u6ca1\u6709\u653e\u5f03\u51fa\u53e3<\/td>\n<td>\u5de5\u5177\u8fd4\u56de\u91cc\u4e0b\u6307\u4ee4&#xff1b;\u9650\u5236\u6b65\u6570<\/td>\n<\/tr>\n<tr>\n<td>\u5ef6\u8fdf\u5f88\u9ad8<\/td>\n<td>\u591a\u8f6e\u8c03\u7528<\/td>\n<td>\u7b80\u5355\u95ee\u9898\u8def\u7531\u8d70\u4f20\u7edf\u94fe<\/td>\n<\/tr>\n<tr>\n<td>\u7b80\u5355\u95ee\u9898\u4e5f\u53bb\u68c0\u7d22<\/td>\n<td>\u6ca1\u533a\u5206<\/td>\n<td>prompt \u91cc\u5199\u660e&#034;\u6253\u62db\u547c\u4e0d\u7528\u68c0\u7d22&#034;<\/td>\n<\/tr>\n<tr>\n<td>\u4e0a\u4e0b\u6587\u7206\u70b8<\/td>\n<td>\u591a\u8f6e\u68c0\u7d22\u7ed3\u679c\u90fd\u7559\u7740<\/td>\n<td>\u53ea\u4fdd\u7559\u76f8\u5173\u7684&#xff1b;\u6216\u7528\u88c1\u526a\u8282\u70b9<\/td>\n<\/tr>\n<tr>\n<td>\u660e\u660e\u6709\u7b54\u6848\u5374\u8bf4\u6ca1\u6709<\/td>\n<td>\u5de5\u5177\u8fd4\u56de&#034;\u65e0\u7ed3\u679c&#034;\u592a\u65e9<\/td>\n<td>\u68c0\u67e5\u68c0\u7d22\u9608\u503c\u662f\u5426\u8fc7\u4e25<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u4e5d\u3001\u5c0f\u7ed3<\/h3>\n<ul>\n<li>Agentic RAG \u628a\u68c0\u7d22\u53d8\u6210\u5de5\u5177&#xff0c;Agent \u81ea\u5df1\u51b3\u5b9a\u67e5\u4e0d\u67e5\u3001\u67e5\u51e0\u6b21&#xff1b;<\/li>\n<li>\u6700\u5c0f\u5b9e\u73b0&#xff1a;&#064;tool \u5305\u4f4f retriever &#043; create_react_agent&#xff0c; \u5de5\u5177\u63cf\u8ff0\u8981\u5199\u6e05\u695a\u4ec0\u4e48\u65f6\u5019\u7528&#xff1b;<\/li>\n<li>\u8fdb\u9636\u52a0\u53cd\u601d\u8282\u70b9&#xff1a;retrieve \u2192 grade \u2192 (generate | rewrite \u2192 retrieve)&#xff0c; \u5fc5\u987b\u8bbe\u91cd\u8bd5\u4e0a\u9650&#xff1b;<\/li>\n<li>\u9002\u5408\u591a\u8df3\u95ee\u7b54\u3001\u8de8\u6570\u636e\u6e90&#xff1b;\u5355\u8df3\u95ee\u7b54\u7528\u4f20\u7edf\u94fe\u66f4\u5feb\u66f4\u7701&#xff1b;<\/li>\n<li>\u6210\u672c\u662f 2~4 \u500d&#xff0c;\u53ef\u4ee5\u7528\u8def\u7531\u505a\u5feb\u6162\u5206\u79bb&#xff1b;<\/li>\n<li>\u9632&#034;\u53cd\u590d\u68c0\u7d22 &#043; \u786c\u7f16&#034;\u4e09\u62db&#xff1a;\u5de5\u5177\u8fd4\u56de\u503c\u91cc\u4e0b\u6307\u4ee4\u3001\u9650\u5236\u6b65\u6570\u3001 \u7ed9\u4e00\u4e2a escalate \u7c7b\u7684\u660e\u786e\u51fa\u53e3\u3002<\/li>\n<\/ul>\n<p>\u4e0b\u4e00\u7bc7\u8bb2 Corrective RAG\u2014\u2014\u68c0\u7d22\u8d28\u91cf\u4e0d\u597d\u65f6\u600e\u4e48\u8865\u6551\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e2a\u4eba\u4e3b\u9875&#xff1a;&gt; for_ever_love__  \u5927\u6a21\u578b\u5f00\u53d1\u4ece0\u52301  iOS\u9879\u76ee\u603b\u7ed3\u5927\u5168  \u6211\u60f3\u5b66python\u4e86  iOS UI &lt; \u6587\u7ae0\u76ee\u5f55LangChain Agentic RAG&#xff1a;\u8ba9 Agent \u81ea\u5df1\u51b3\u5b9a\u8981\u4e0d\u8981\u68c0\u7d22\u3001\u68c0\u7d22\u51e0\u6b21\u4e00\u3001\u4e24\u79cd RAG \u7684\u7ed3\u6784\u5bf9\u6bd4\u4e8c\u3001\u6700\u5c0f\u5b9e\u73b0&#xff1a;\u628a retriever \u5305\u6210<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[8162,13111,997,3503,4119],"topic":[],"class_list":["post-115420","post","type-post","status-publish","format-standard","hentry","category-server","tag-agentic","tag-13111","tag-langchain","tag-langgraph","tag-rag"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>LangChain Agentic RAG\uff1a\u8ba9 Agent \u81ea\u5df1\u51b3\u5b9a\u8981\u4e0d\u8981\u68c0\u7d22\u3001\u68c0\u7d22\u51e0\u6b21 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/115420.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LangChain Agentic RAG\uff1a\u8ba9 Agent \u81ea\u5df1\u51b3\u5b9a\u8981\u4e0d\u8981\u68c0\u7d22\u3001\u68c0\u7d22\u51e0\u6b21 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u4e2a\u4eba\u4e3b\u9875&#xff1a;&gt; for_ever_love__ \u5927\u6a21\u578b\u5f00\u53d1\u4ece0\u52301 iOS\u9879\u76ee\u603b\u7ed3\u5927\u5168 \u6211\u60f3\u5b66python\u4e86 iOS UI &lt; \u6587\u7ae0\u76ee\u5f55LangChain Agentic RAG&#xff1a;\u8ba9 Agent \u81ea\u5df1\u51b3\u5b9a\u8981\u4e0d\u8981\u68c0\u7d22\u3001\u68c0\u7d22\u51e0\u6b21\u4e00\u3001\u4e24\u79cd RAG \u7684\u7ed3\u6784\u5bf9\u6bd4\u4e8c\u3001\u6700\u5c0f\u5b9e\u73b0&#xff1a;\u628a retriever \u5305\u6210\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/115420.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta 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