{"id":3689,"date":"2025-05-07T18:59:15","date_gmt":"2025-05-07T10:59:15","guid":{"rendered":"https:\/\/fushuling.com\/?p=3689"},"modified":"2025-05-17T22:04:29","modified_gmt":"2025-05-17T14:04:29","slug":"langchain%e5%85%a5%e9%97%a8","status":"publish","type":"post","link":"https:\/\/fushuling.com\/index.php\/2025\/05\/07\/langchain%e5%85%a5%e9%97%a8\/","title":{"rendered":"LangChain\u5165\u95e8"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">LangChain<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">\u6982\u8ff0<\/h2>\n\n\n\n<p><strong>LangChain<\/strong> \u662f\u4e00\u4e2a\u7528\u4e8e\u6784\u5efa\u57fa\u4e8e\u5927\u8bed\u8a00\u6a21\u578b\uff08LLM\uff09\u7684\u5e94\u7528\u7a0b\u5e8f\u7684 Python \u6846\u67b6\uff0c\u5b83\u7684\u6838\u5fc3\u76ee\u6807\u662f\u8ba9\u6211\u4eec\u80fd\u66f4\u5bb9\u6613\u5730\u628a LLM \u4e0e\u6570\u636e\u3001\u5de5\u5177\u3001\u8bb0\u5fc6\u7b49\u7ec4\u4ef6\u8fde\u63a5\u8d77\u6765\uff0c\u6784\u5efa\u590d\u6742\u7684\u3001\u53ef\u7ec4\u5408\u7684 AI \u5e94\u7528\u3002<\/p>\n\n\n\n<p>\u5927\u8bed\u8a00\u6a21\u578b\u5f88\u5f3a\uff0c\u4f46\u539f\u751f API \u53ea\u652f\u6301\u300c\u95ee\u4e00\u53e5 \u2192 \u56de\u4e00\u53e5\u300d\u7684\u7b80\u5355\u7528\u6cd5\uff0c\u5982\u679c\u6211\u4eec\u60f3\u5b9e\u73b0\u6709\u8bb0\u5fc6\u7684\u591a\u8f6e\u5bf9\u8bdd\u3001\u81ea\u52a8\u8c03\u7528\u5de5\u5177\uff08\u5982\u641c\u7d22\u3001\u6570\u636e\u5e93\u3001\u6d4f\u89c8\u5668\uff09\u6216\u8005\u667a\u80fd\u4f53\uff08Agent\uff09\u81ea\u52a8\u89e3\u51b3\u95ee\u9898\u8fd9\u7c7b\u8f83\u4e3a\u590d\u6742\u7684\u64cd\u4f5c\u7684\u8bdd\u6211\u4eec\u5c31\u9700\u8981 LangChain \uff0c\u4e8b\u5b9e\u4e0a\u5b83\u5c31\u662f\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\u800c\u8bbe\u8ba1\u7684\u3002<\/p>\n\n\n\n<p>LangChain\u7b80\u5316\u4e86LLM\u5e94\u7528\u7a0b\u5e8f\u751f\u547d\u5468\u671f\u7684\u5404\u4e2a\u9636\u6bb5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u5f00\u53d1\u9636\u6bb5\uff1a\u4f7f\u7528LangChain\u7684\u5f00\u6e90\u6784\u5efa\u5757\u548c\u7ec4\u4ef6\u6784\u5efa\u5e94\u7528\u7a0b\u5e8f\uff0c\u5229\u7528\u7b2c\u4e09\u65b9\u96c6\u6210\u548c\u6a21\u677f\u5feb\u901f\u542f\u52a8\u3002\n\n\u751f\u4ea7\u5316\u9636\u6bb5\uff1a\u4f7f\u7528LangSmith\u68c0\u67e5\u3001\u76d1\u63a7\u548c\u8bc4\u4f30\u60a8\u7684\u94fe\uff0c\u4ece\u800c\u53ef\u4ee5\u81ea\u4fe1\u5730\u6301\u7eed\u4f18\u5316\u548c\u90e8\u7f72\u3002\n\n\u90e8\u7f72\u9636\u6bb5\uff1a\u4f7f\u7528LangServe\u5c06\u4efb\u4f55\u94fe\u8f6c\u5316\u4e3aAPI\u3002<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">LangChain\u7684\u516d\u5927\u7ec4\u4ef6<\/h2>\n\n\n\n<p>LangChain \u7684\u8bbe\u8ba1\u601d\u60f3\u662f\u201c<strong>\u7ec4\u4ef6\u5316 + \u94fe\u5f0f\u7ec4\u5408<\/strong>\u201d\uff0c\u4ed6\u6709\u516d\u4e2a\u4e3b\u8981\u7684\u7ec4\u4ef6\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6a21\u578b\uff08Models\uff09\uff1a\u5305\u542b\u5404\u5927\u8bed\u8a00\u6a21\u578b\u7684LangChain\u63a5\u53e3\u548c\u8c03\u7528\u7ec6\u8282\uff0c\u4ee5\u53ca\u8f93\u51fa\u89e3\u6790\u673a\u5236\u3002<\/li>\n\n\n\n<li>\u63d0\u793a\u6a21\u677f\uff08Prompts\uff09\uff1a\u4f7f\u63d0\u793a\u5de5\u7a0b\u6d41\u7ebf\u5316\uff0c\u8fdb\u4e00\u6b65\u6fc0\u53d1\u5927\u8bed\u8a00\u6a21\u578b\u7684\u6f5c\u529b\u3002<\/li>\n\n\n\n<li>\u6570\u636e\u68c0\u7d22\uff08Indexes\uff09\uff1a\u6784\u5efa\u5e76\u64cd\u4f5c\u6587\u6863\u7684\u65b9\u6cd5\uff0c\u63a5\u53d7\u7528\u6237\u7684\u67e5\u8be2\u5e76\u8fd4\u56de\u6700\u76f8\u5173\u7684\u6587\u6863\uff0c\u8f7b\u677e\u642d\u5efa\u672c\u5730\u77e5\u8bc6\u5e93\u3002<\/li>\n\n\n\n<li>\u8bb0\u5fc6\uff08Memory\uff09\uff1a\u901a\u8fc7\u77ed\u65f6\u8bb0\u5fc6\u548c\u957f\u65f6\u8bb0\u5fc6\uff0c\u5728\u5bf9\u8bdd\u8fc7\u7a0b\u4e2d\u5b58\u50a8\u548c\u68c0\u7d22\u6570\u636e\uff0c\u8ba9ChatBot\u8bb0\u4f4f\u4f60\u3002<\/li>\n\n\n\n<li>\u94fe\uff08Chains\uff09\uff1aLangChain\u4e2d\u7684\u6838\u5fc3\u673a\u5236\uff0c\u4ee5\u7279\u5b9a\u65b9\u5f0f\u5c01\u88c5\u5404\u79cd\u529f\u80fd\uff0c\u5e76\u901a\u8fc7\u4e00\u7cfb\u5217\u7684\u7ec4\u5408\uff0c\u81ea\u52a8\u800c\u7075\u6d3b\u5730\u5b8c\u6210\u4efb\u52a1\u3002<\/li>\n\n\n\n<li>\u4ee3\u7406\uff08Agents\uff09\uff1a\u53e6\u4e00\u4e2aLangChain\u4e2d\u7684\u6838\u5fc3\u673a\u5236\uff0c\u901a\u8fc7\u201c\u4ee3\u7406\u201d\u8ba9\u5927\u6a21\u578b\u81ea\u4e3b\u8c03\u7528\u5916\u90e8\u5de5\u5177\u548c\u5185\u90e8\u5de5\u5177\uff0c\u4f7f\u667a\u80fdAgent\u6210\u4e3a\u53ef\u80fd\u3002<\/li>\n<\/ul>\n\n\n\n<p>LangChain\u7684\u5de5\u4f5c\u6d41\u7a0b\u5927\u6982\u957f\u8fd9\u6837\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>User Input\n   \u2193\nPromptTemplate\uff08\u62fc Prompt\uff09\n   \u2193\nLLM \u8c03\u7528\uff08OpenAI\/HuggingFace\uff09\n   \u2193\nMemory \/ Tools \/ Retrievers\uff08\u53ef\u9009\uff09\n   \u2193\n\u8f93\u51fa\u6216\u7ee7\u7eed\u4e0b\u4e00\u6b65 Chain \/ Agent<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u5f00\u6e90\u5e93\u7ec4\u6210<\/h2>\n\n\n\n<p>LangChain\u4e3b\u8981\u7531\u4ee5\u4e0b\u5f00\u6e90\u5e93\u7ec4\u6210\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>langchain-core \uff1a\u57fa\u7840\u62bd\u8c61\u548cLangChain\u8868\u8fbe\u5f0f\u8bed\u8a00<\/li>\n\n\n\n<li>langchain-community \uff1a\u7b2c\u4e09\u65b9\u96c6\u6210\u3002\u5408\u4f5c\u4f19\u4f34\u5305\uff08\u5982langchain-openai\u3001langchain-anthropic\u7b49\uff09\uff0c\u4e00\u4e9b\u96c6\u6210\u5df2\u7ecf\u8fdb\u4e00\u6b65\u62c6\u5206\u4e3a\u81ea\u5df1\u7684\u8f7b\u91cf\u7ea7\u5305\uff0c\u53ea\u4f9d\u8d56\u4e8elangchain-core<\/li>\n\n\n\n<li>langchain \uff1a\u6784\u6210\u5e94\u7528\u7a0b\u5e8f\u8ba4\u77e5\u67b6\u6784\u7684\u94fe\u3001\u4ee3\u7406\u548c\u68c0\u7d22\u7b56\u7565<\/li>\n\n\n\n<li>langgraph\uff1a\u901a\u8fc7\u5c06\u6b65\u9aa4\u5efa\u6a21\u4e3a\u56fe\u4e2d\u7684\u8fb9\u548c\u8282\u70b9\uff0c\u4f7f\u7528 LLMs \u6784\u5efa\u5065\u58ee\u4e14\u6709\u72b6\u6001\u7684\u591a\u53c2\u4e0e\u8005\u5e94\u7528\u7a0b\u5e8f<\/li>\n\n\n\n<li>langserve\uff1a\u5c06 LangChain \u94fe\u90e8\u7f72\u4e3a REST API<\/li>\n\n\n\n<li>LangSmith\uff1a\u4e00\u4e2a\u5f00\u53d1\u8005\u5e73\u53f0\uff0c\u53ef\u8ba9\u60a8\u8c03\u8bd5\u3001\u6d4b\u8bd5\u3001\u8bc4\u4f30\u548c\u76d1\u63a7LLM\u5e94\u7528\u7a0b\u5e8f\uff0c\u5e76\u4e0eLangChain\u65e0\u7f1d\u96c6\u6210<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">LangChain\u57fa\u672c\u4f7f\u7528<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">\u5b89\u88c5\u4e0e\u914d\u7f6e<\/h2>\n\n\n\n<p>\u9996\u5148\u7b2c\u4e00\u6b65\u5f53\u7136\u662f\u5b89\u88c5LangChain\uff0c\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>python -m pip install langchain<\/code><\/pre>\n\n\n\n<p>\u8fd9\u4e2a\u8fc7\u7a0b\u91cc\u4f1a\u4e0b\u8f7d\u975e\u5e38\u591a\u7684\u7ec4\u4ef6\uff0c\u8986\u76d6\u6211\u4eec\u9700\u8981\u7684\u5e38\u89c1\u5f00\u6e90\u5e93\uff0c\u63a5\u7740\u6211\u4eec\u9700\u8981\u53bb\u5b89\u88c5LangChain\u65f6\u5305\u62ec\u5e38\u7528\u7684\u5f00\u6e90LLM\uff08\u5927\u8bed\u8a00\u6a21\u578b\uff09 \u5e93\uff0c\u6bd4\u5982openai\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>python -m pip install openai<\/code><\/pre>\n\n\n\n<p>\u63a5\u7740\u5b89\u88c5\u7b2c\u4e09\u65b9\u96c6\u6210\u5e93\uff0c\u4ee5\u4f7f\u7528OpenAI\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>python -m pip install langchain langchain_openai<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u6700\u7b80\u5355\u7684demo<\/h2>\n\n\n\n<p>\u5982\u679c\u6211\u4eec\u60f3\u8981\u4f7f\u7528OpenAI\uff0c\u9996\u5148\u9700\u8981\u914d\u7f6eOpenAI\u73af\u5883\u53d8\u91cf\uff0c\u5bfc\u5165\u63a5\u53e3\u548ckey\uff0c\u8fd9\u4e2a\u4e1c\u897f\u53ef\u4ee5\u5355\u72ec\u5728\u4e00\u4e2a\u6587\u4ef6\u91cc\u8bbe\u7f6e\u7136\u540e\u5bfc\u5165\uff0c\u4e5f\u53ef\u4ee5\u76f4\u63a5\u5728\u6211\u4eec\u7684\u4ee3\u7801\u7684\u57fa\u7840\u4e0a\u5f15\u5165\uff0c\u8fd9\u91cc\u6211\u5c31\u4f7f\u7528\u7b2c\u4e8c\u79cd\u65b9\u5f0f\uff0c\u8fd9\u91cc\u6211\u7528\u7684\u4e0d\u662f\u539f\u751f\u7684openapi\uff0c\u7528\u7684\u662f\u4e2d\u8f6c\u7684\uff1a<a href=\"https:\/\/gptgod.site\/\">https:\/\/gptgod.site\/<\/a><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from langchain_openai import ChatOpenAI\n\nllm = ChatOpenAI(\n    api_key=\"sk-XXXXXX\",\n    base_url=\"https:\/\/api.gptgod.online\/v1\/\"\n)\n\nprint(llm.invoke(\"\u6c38\u96cf\u5854\u83f2\u662f\u4ec0\u4e48\uff1f\"))<\/code><\/pre>\n\n\n\n<p>\u7136\u540e\u5c31\u53ef\u4ee5\u83b7\u5f97llm\u7684\u8fd4\u56de\u7ed3\u679c\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2025%2F04%2FQQ20250507-154627-7-1.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2025%2F04%2FQQ20250507-154627-7-1.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f7f\u7528\u63d0\u793a\u6a21\u677f<\/h2>\n\n\n\n<p>LangChain \u4e2d\u7684\u300c\u63d0\u793a\u6a21\u677f\uff08PromptTemplate\uff09\u300d\u529f\u80fd\u53ef\u4ee5\u628a\u7528\u6237\u7684\u539f\u59cb\u8f93\u5165\u5305\u88c5\u6210\u7ed3\u6784\u5316\u3001\u6709\u4e0a\u4e0b\u6587\u7684\u63d0\u793a\uff0c\u6307\u5bfc LLM \u751f\u6210\u66f4\u7b26\u5408\u9884\u671f\u7684\u56de\u7b54\u3002<\/p>\n\n\n\n<p>\u6bd4\u5982\u6211\u4eec\u53ef\u4ee5\u6309\u8fd9\u4e2a\u683c\u5f0f\u521b\u5efa\u63d0\u793a\u6a21\u677f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from langchain_core.prompts import ChatPromptTemplate\nprompt = ChatPromptTemplate.from_messages(&#91;\n    (\"system\", \"\u60a8\u662f\u4e16\u754c\u7ea7\u7684\u4e8c\u6b21\u5143\u9ad8\u624b\u3002\"),\n    (\"user\", \"{input}\")\n])<\/code><\/pre>\n\n\n\n<p>\u5176\u4e2d\u8fd9\u4e2a <code>system<\/code> \u53ef\u4ee5\u7ed9 LLM \u8bbe\u5b9a\u89d2\u8272\/\u98ce\u683c\uff0c\u6bd4\u5982\u8fd9\u91cc\u662f&#8221;\u60a8\u662f\u4e16\u754c\u7ea7\u7684\u4e8c\u6b21\u5143\u9ad8\u624b&#8221;\uff0c\u8fd9\u4f1a\u5f71\u54cd\u56de\u7b54\u7684\u8bed\u6c14\u3001\u7ec4\u7ec7\u65b9\u5f0f\u3002\u63a5\u7740 <code>user {input}<\/code> \u662f\u5360\u4f4d\u7b26\uff0c\u7528\u4e8e\u4e4b\u540e\u52a8\u6001\u4f20\u5165\u7528\u6237\u8f93\u5165\u3002<\/p>\n\n\n\n<p>\u6bd4\u5982\u6211\u4eec\u73b0\u5728\u548c\u4e4b\u524d\u4e00\u6837\u4f20\u5165 <code>chain.invoke({\"input\": \"\u6c38\u96cf\u5854\u83f2\u662f\u4ec0\u4e48\uff1f\"})<\/code>\uff0c\u5b9e\u9645\u4e0a\u4f20\u7ed9llm\u7684\u4e1c\u897f\u5c31\u53d8\u6210\u4e86\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>System: \u60a8\u662f\u4e16\u754c\u7ea7\u7684\u4e8c\u6b21\u5143\u9ad8\u624b\u3002\nUser: <span style=\"background-color: initial; font-family: inherit; font-size: inherit; color: initial;\">\u6c38\u96cf\u5854\u83f2\u662f\u4ec0\u4e48\uff1f<\/span><\/code><\/pre>\n\n\n\n<p>\u6700\u540e\u6211\u4eec\u9700\u8981\u6784\u9020\u4e00\u4e2a\u6784\u9020 LLM \u94fe\uff08Chain\uff09\uff0c\u683c\u5f0f\u4e3a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>chain = prompt | llm<\/code><\/pre>\n\n\n\n<p>\u8fd9\u662f LangChain \u7684\u300c\u7ba1\u9053\u5199\u6cd5\u300d\uff0c\u5b83\u628a <code>prompt<\/code> \u8f93\u51fa\u7684\u7ed3\u6784\u5316\u63d0\u793a\u4f5c\u4e3a\u8f93\u5165\u4ea4\u7ed9 <code>llm<\/code> \u5904\u7406\uff0c\u6700\u540e\u8fd4\u56de AI \u7684\u56de\u7b54\uff0c\u6d41\u7a0b\u4e5f\u5c31\u662f\uff1a<code>prompt<\/code> \u279c <code>llm<\/code> \u279c \u8f93\u51fa\u7b54\u6848\uff0c\u73b0\u5728\u5b8c\u6574\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from langchain_openai import ChatOpenAI\nfrom langchain_core.prompts import ChatPromptTemplate\n\nllm = ChatOpenAI(\n    api_key=\"sk-XXXXX\",\n    base_url=\"https:\/\/api.gptgod.online\/v1\/\"\n)\n\n# \u521b\u5efa\u63d0\u793a\u6a21\u677f\nprompt = ChatPromptTemplate.from_messages(&#91;\n    (\"system\", \"\u60a8\u662f\u4e16\u754c\u7ea7\u7684\u4e8c\u6b21\u5143\u9ad8\u624b\u3002\"),\n    (\"user\", \"{input}\")\n])\n\n# \u7ec4\u5408\u6210\u4e00\u4e2a\u7b80\u5355\u7684 LLM \u94fe\nchain = prompt | llm \n\n# \u4f7f\u7528LLM\u94fe\nprint(chain.invoke({\"input\": \"\u6c38\u96cf\u5854\u83f2\u662f\u4ec0\u4e48\uff1f\"}))<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2025%2F04%2FQQ20250507-160700-7-2.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2025%2F04%2FQQ20250507-160700-7-2.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u73b0\u5728\u7684\u56de\u590d\u5c31\u6bd4\u4e4b\u524d\u5510\u4e86\u70b9\uff0c\u4f1a\u63d0\u5230\u5854\u83f2\u6765\u81ea\u4e8e\u4e8c\u6b21\u5143\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f7f\u7528\u8f93\u51fa\u89e3\u6790\u5668<\/h2>\n\n\n\n<p>\u8f93\u51fa\u89e3\u6790\u5668\uff08<code>StrOutputParser<\/code>\uff09\u53ef\u4ee5\u628a LLM \u8fd4\u56de\u7684\u7ed3\u6784\u5316\u6d88\u606f\uff08\u5982 <code>ChatMessage<\/code> \u5bf9\u8c61\uff09\u89e3\u6790\u6210\u4e00\u4e2a\u7b80\u5355\u7684\u5b57\u7b26\u4e32\uff0c\u4fbf\u4e8e\u540e\u7eed\u5904\u7406\u6216\u5c55\u793a\uff0c\u6211\u4eec\u53ea\u9700\u8981\u52a0\u4e00\u53e5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>output_parser = StrOutputParser()\nchain = prompt | llm | output_parser<\/code><\/pre>\n\n\n\n<p>\u8fd9\u6837\u518d\u8c03\u7528\u5b83\u5e76\u63d0\u51fa\u540c\u6837\u7684\u95ee\u9898\uff0c\u7b54\u6848\u5c31\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u800c\u4e0d\u662fChatMessage\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from langchain_openai import ChatOpenAI\nfrom langchain_core.prompts import ChatPromptTemplate\nfrom langchain_core.output_parsers import StrOutputParser\n\nllm = ChatOpenAI(\n    api_key=\"sk-XXXXX\",\n    base_url=\"https:\/\/api.gptgod.online\/v1\/\"\n)\n\n# \u521b\u5efa\u63d0\u793a\u6a21\u677f\nprompt = ChatPromptTemplate.from_messages(&#91;\n    (\"system\", \"\u60a8\u662f\u4e16\u754c\u7ea7\u7684\u4e8c\u6b21\u5143\u9ad8\u624b\u3002\"),\n    (\"user\", \"{input}\")\n])\n\n# \u4f7f\u7528\u8f93\u51fa\u89e3\u6790\u5668\noutput_parser = StrOutputParser()\n\n# \u5c06\u5176\u6dfb\u52a0\u5230\u4e0a\u4e00\u4e2a\u94fe\u4e2d\nchain = prompt | llm | output_parser\n\n# \u8c03\u7528\u5b83\u5e76\u63d0\u51fa\u540c\u6837\u7684\u95ee\u9898\u3002\u7b54\u6848\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u800c\u4e0d\u662fChatMessage\nprint(chain.invoke({\"input\": \"\u6c38\u96cf\u5854\u83f2\u662f\u4ec0\u4e48\uff1f\"}))<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2025%2F04%2FQQ20250507-161402-7-3.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2025%2F04%2FQQ20250507-161402-7-3.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u5411\u91cf\u5b58\u50a8<\/h2>\n\n\n\n<p>\u5229\u7528\u5411\u91cf\u5b58\u50a8\uff0c\u6211\u4eec\u53ef\u4ee5\u628a\u7f51\u9875\u5185\u5bb9\u53d8\u6210\u5411\u91cf\u8868\u793a\u5e76\u5b58\u5165 FAISS \u5411\u91cf\u5e93\uff0c\u4ee5\u540e LLM \u53ef\u4ee5\u901a\u8fc7\u8bed\u4e49\u641c\u7d22\u67e5\u627e\u8fd9\u4e9b\u5185\u5bb9\u4f5c\u4e3a\u53c2\u8003\uff0c\u8fd9\u6837\u5c31\u5b9e\u73b0\u4e86RAG\uff08Retrieval-Augmented Generation\uff09\uff0c\u9996\u5148\u5b89\u4e00\u4e2a\u4e1c\u897f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>python -m pip install langchain_community<\/code><\/pre>\n\n\n\n<p>\u60f3\u8981\u52a0\u8f7d\u7d22\u5f15\u7684\u6570\u636e\uff0c\u9996\u5148\u6211\u4eec\u9700\u8981\u5b89\u88c5 <code>beautifulsoup<\/code> \u548c\u672c\u5730\u5411\u91cf\u5b58\u50a8 <code>FAISS<\/code>\uff08Facebook \u5f00\u6e90\u7684\u672c\u5730\u5411\u91cf\u6570\u636e\u5e93\uff0c\u7528\u4e8e\u5b58\u50a8\u548c\u67e5\u8be2\u5411\u91cf\uff09<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>python -m pip install beautifulsoup4 faiss-cpu<\/code><\/pre>\n\n\n\n<p>\u60f3\u8981\u52a0\u8f7d\u7f51\u9875\u6587\u6863\uff0c\u6211\u4eec\u9700\u8981\u5229\u7528 <code>WebBaseLoader<\/code> \u6293\u53d6\u6307\u5b9a\u7f51\u9875\uff0c\u7136\u540e\u7528 <code>BeautifulSoup<\/code> \u89e3\u6790\u5185\u5bb9\uff0c\u6700\u540e\u5f97\u5230\u4e00\u7ec4\u201c\u6587\u6863\u5bf9\u8c61\u201d\uff08LangChain \u7684\u6807\u51c6\u683c\u5f0f\uff09<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from langchain_community.document_loaders import WebBaseLoader\n\nloader = WebBaseLoader(\"https:\/\/baike.baidu.com\/item\/%E6%B0%B8%E9%9B%8F%E5%A1%94%E8%8F%B2\/61675407\")\ndocs = loader.load()<\/code><\/pre>\n\n\n\n<p>\u63a5\u7740\u521d\u59cb\u5316\u5d4c\u5165\u6a21\u578b\uff0c\u8fd9\u91cc\u6211\u4eec\u4f7f\u7528OpenAI \u63d0\u4f9b\u7684\u5d4c\u5165\u6a21\u578b\uff08\u5982 <code>text-embedding-ada-002<\/code>\uff09\u628a\u6587\u672c\u8f6c\u6362\u4e3a\u201c\u5411\u91cf\u201d\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from langchain_openai import OpenAIEmbeddings\nembeddings = OpenAIEmbeddings()<\/code><\/pre>\n\n\n\n<p>\u7136\u540e\u9700\u8981\u5bf9\u6587\u672c\u5206\u5272\uff08\u5207\u5757\uff09\uff0c\u56e0\u4e3a\u4e00\u6574\u9875\u7f51\u9875\u592a\u957f\uff0c\u4e0d\u80fd\u76f4\u63a5\u505a\u5d4c\u5165\u6216\u67e5\u8be2\uff0c\u8981\u62c6\u6210\u4e00\u6bb5\u4e00\u6bb5\u7684\u5c0f\u6587\u672c\uff0c<code>RecursiveCharacterTextSplitter<\/code> \u4f1a\u81ea\u52a8\u6309\u7ed3\u6784\u5207\u5206\uff0c\u6bd4\u5982\u6309\u6bb5\u843d\u3001\u53e5\u5b50\u3001\u5b57\u7b26\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from langchain_text_splitters import RecursiveCharacterTextSplitter\n\ntext_splitter = RecursiveCharacterTextSplitter()\ndocuments = text_splitter.split_documents(docs)<\/code><\/pre>\n\n\n\n<p>\u6700\u540e\u521b\u5efa\u5411\u91cf\u5b58\u50a8\uff08FAISS\uff09\uff0c\u628a\u6bcf\u6bb5\u6587\u6863\u8f6c\u6362\u4e3a\u5411\u91cf\u7528 FAISS \u5b58\u8d77\u6765\uff0c\u540e\u7eed\u53ef\u4ee5\u7528\u5411\u91cf\u76f8\u4f3c\u5ea6\u67e5\u627e\u8fd9\u4e9b\u5185\u5bb9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from langchain_community.vectorstores import FAISS\n\nvector = FAISS.from_documents(documents, embeddings)<\/code><\/pre>\n\n\n\n<p>\u901a\u8fc7\u4e0a\u9762\u7684\u64cd\u4f5c\uff0c\u6211\u4eec\u5c31\u5efa\u597d\u4e86\u4e00\u4e2a\u672c\u5730\u5411\u91cf\u6570\u636e\u5e93 <code>vector<\/code>\uff0c\u5b83\u53ef\u4ee5\u5c06\u7ed3\u679c\u53cd\u9988\u7ed9 LLM \u4f5c\u4e3a\u4e0a\u4e0b\u6587\u53c2\u8003\uff0c\u6839\u636e\u7528\u6237\u8f93\u5165\uff08\u5982\u95ee\u9898\uff09\u751f\u6210\u5d4c\u5165\u5411\u91cf\uff0c\u7136\u540e\u5728\u5176\u4e2d\u67e5\u627e\u6700\u76f8\u4f3c\u7684\u6587\u6863\u6bb5\u843d\uff0c\u8fd9\u5c31\u662f RAG \u7684\u68c0\u7d22\u90e8\u5206\uff0c\u6d41\u7a0b\u5927\u6982\u957f\u8fd9\u6837\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u7f51\u9875 \u279c BeautifulSoup \u279c \u6587\u672c\u6bb5\u843d \u279c \u5d4c\u5165\u6a21\u578b \u279c \u5411\u91cf\u8868\u793a \u279c FAISS \u5411\u91cf\u5e93<\/code><\/pre>\n\n\n\n<p>\u5b8c\u6574\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># \u5bfc\u5165\u548c\u4f7f\u7528 WebBaseLoader\nfrom langchain_community.document_loaders import WebBaseLoader\n\nloader = WebBaseLoader(\"https:\/\/baike.baidu.com\/item\/%E6%B0%B8%E9%9B%8F%E5%A1%94%E8%8F%B2\/61675407\")\ndocs = loader.load()\n\n# \u5bf9\u4e8e\u5d4c\u5165\u6a21\u578b\uff0c\u8fd9\u91cc\u901a\u8fc7 API\u8c03\u7528\nfrom langchain_openai import OpenAIEmbeddings\n\nembeddings = OpenAIEmbeddings()\n\n#\u4f7f\u7528\u6b64\u5d4c\u5165\u6a21\u578b\u5c06\u6587\u6863\u6444\u53d6\u5230\u77e2\u91cf\u5b58\u50a8\u4e2d\nfrom langchain_community.vectorstores import FAISS\nfrom langchain_text_splitters import RecursiveCharacterTextSplitter\n\n# \u4f7f\u7528\u5206\u5272\u5668\u5206\u5272\u6587\u6863\ntext_splitter = RecursiveCharacterTextSplitter()\ndocuments = text_splitter.split_documents(docs)\n# \u5411\u91cf\u5b58\u50a8\nvector = FAISS.from_documents(documents, embeddings)<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u68c0\u7d22\u94fe<\/h2>\n\n\n\n<p>\u5728\u4e0a\u9762\u7684\u6b65\u9aa4\u91cc\uff0c\u6211\u4eec\u5df2\u5728\u5411\u91cf\u5b58\u50a8\u4e2d\u7d22\u5f15\u4e86\u8fd9\u4e9b\u6570\u636e\uff0c\u63a5\u4e0b\u6765\u8981\u521b\u5efa\u4e00\u4e2a\u68c0\u7d22\u94fe\u3002\u8be5\u94fe\u5c06\u63a5\u6536\u4e00\u4e2a\u4f20\u5165\u7684\u95ee\u9898\uff0c\u67e5\u627e\u76f8\u5173\u6587\u6863\uff0c\u7136\u540e\u5c06\u8fd9\u4e9b\u6587\u6863\u4e0e\u539f\u59cb\u95ee\u9898\u4e00\u8d77\u4f20\u9012\u7ed9LLM\uff0c\u8981\u6c42\u5b83\u56de\u7b54\u539f\u59cb\u95ee\u9898\u3002<\/p>\n\n\n\n<p>\u73b0\u5728\u6211\u4eec\u5c31\u53ef\u4ee5\u8981\u6c42llm\u53ea\u80fd\u4ece\u6211\u4eec\u4e0a\u9762\u8bbe\u7f6e\u597d\u7684\u6570\u636e\u5e93\u91cc\u8fdb\u884c\u56de\u7b54\uff0c\u5b8c\u6574\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import os\n\n# \u5bfc\u5165\u6a21\u5757\nfrom langchain_community.document_loaders import WebBaseLoader\nfrom langchain_openai import ChatOpenAI, OpenAIEmbeddings\nfrom langchain_community.vectorstores import FAISS\nfrom langchain_text_splitters import RecursiveCharacterTextSplitter\nfrom langchain.chains import create_retrieval_chain\nfrom langchain.chains.combine_documents import create_stuff_documents_chain\nfrom langchain_core.prompts import ChatPromptTemplate\n\n# 1. \u52a0\u8f7d\u7f51\u9875\u6587\u6863\uff08\u6c38\u96cf\u5854\u83f2\u8bcd\u6761\uff09\nloader = WebBaseLoader(\"https:\/\/baike.baidu.com\/item\/%E6%B0%B8%E9%9B%8F%E5%A1%94%E8%8F%B2\/61675407\")\ndocs = loader.load()\n\n# 2. \u6587\u672c\u5206\u5272\ntext_splitter = RecursiveCharacterTextSplitter()\ndocuments = text_splitter.split_documents(docs)\n\n# 3. \u5d4c\u5165\u6a21\u578b\nembeddings = OpenAIEmbeddings(\n    api_key=\"sk-xxx\",\n    base_url=\"https:\/\/api.gptgod.online\/v1\/\"\n)\n\n# 4. \u5411\u91cf\u6570\u636e\u5e93\u6784\u5efa\nvector = FAISS.from_documents(documents, embeddings)\n\n# 5. \u521b\u5efa LLM \u548c Prompt\nllm = ChatOpenAI(\n    api_key=\"sk-xxx\",\n    base_url=\"https:\/\/api.gptgod.online\/v1\/\"\n)\n\nprompt = ChatPromptTemplate.from_template(\"\"\"\u4ec5\u6839\u636e\u63d0\u4f9b\u7684\u4e0a\u4e0b\u6587\u56de\u7b54\u4ee5\u4e0b\u95ee\u9898:\n\n&lt;context>\n{context}\n&lt;\/context>\n\nQuestion: {input}\"\"\")\n\n# 6. \u521b\u5efa\u6587\u6863\u94fe\uff08\u8d1f\u8d23\u628a\u591a\u4e2a\u6587\u6863\u62fc\u6210\u63d0\u793a\uff0c\u53d1\u7ed9 LLM\uff09\ndocument_chain = create_stuff_documents_chain(llm, prompt)\n\n# 7. \u521b\u5efa\u68c0\u7d22\u5668\uff08\u4ece FAISS \u68c0\u7d22\uff09\nretriever = vector.as_retriever()\n\n# 8. \u521b\u5efa\u6700\u7ec8\u68c0\u7d22\u94fe\nretrieval_chain = create_retrieval_chain(retriever, document_chain)\n\n# 9. \u6267\u884c\u67e5\u8be2\nquery = \"\u6c38\u96cf\u5854\u83f2\u662f\u8c01\uff1f\"\nresponse = retrieval_chain.invoke({\"input\": query})\n\n# 10. \u6253\u5370\u7ed3\u679c\nprint(\"\\n\u3010\u95ee\u9898\u3011\uff1a\", query)\nprint(\"\u3010\u56de\u7b54\u3011\uff1a\", response&#91;\"answer\"])<\/code><\/pre>\n\n\n\n<p>\u73b0\u5728llm\u5c31\u4e0d\u4f1a\u4e71\u8bf4\u4e86\uff0c\u800c\u662f\u6839\u636e\u6587\u6863\u56de\u7b54\u51fa\u6b63\u786e\u7684\u5185\u5bb9\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2025%2F04%2FQQ20250507-163936-7-4.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2025%2F04%2FQQ20250507-163936-7-4.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u5bf9\u8bdd\u68c0\u7d22\u94fe<\/h2>\n\n\n\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\u662f\u4e00\u6b21\u6027\u7684\uff0c\u8fd9\u91cc\u6211\u4eec\u6765\u6784\u5efa\u4e00\u4e2a<strong>\u5bf9\u8bdd\u5f0f\u95ee\u7b54\u7cfb\u7edf\uff08conversational retrieval QA chain\uff09<\/strong>\uff0c\u9002\u5408\u7528\u6237\u8fde\u7eed\u63d0\u95ee\u3001\u5f15\u7528\u524d\u6587\u4e0a\u4e0b\u6587\u7684\u573a\u666f\u3002\u666e\u901a\u68c0\u7d22\u94fe\u53ea\u6839\u636e\u5f53\u524d\u7528\u6237\u95ee\u9898\u53bb\u68c0\u7d22\u76f8\u5173\u5185\u5bb9\uff0c\u800c<strong>\u5bf9\u8bdd\u68c0\u7d22\u94fe<\/strong>\u4f1a\u53c2\u8003\u4e4b\u524d\u7684\u5bf9\u8bdd\u5386\u53f2\uff0c\u4ece\u800c\u751f\u6210\u66f4\u51c6\u786e\u3001\u66f4\u4e0a\u4e0b\u6587\u76f8\u5173\u7684\u641c\u7d22\u67e5\u8be2\u3002<\/p>\n\n\n\n<p>\u9996\u5148\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u751f\u6210\u68c0\u7d22\u67e5\u8be2\u7684 Prompt\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u628a\u4e4b\u524d\u7684\u5bf9\u8bdd\u8bb0\u5f55 (<code>chat_history<\/code>) \u548c\u5f53\u524d\u95ee\u9898 (<code>input<\/code>) \u4e00\u8d77\u4ea4\u7ed9 LLM\uff0c\u6700\u540e\u4e00\u53e5\u8bdd\u662f\u63d0\u793a LLM\uff1a\u201c\u8bf7\u6839\u636e\u4e0a\u4e0b\u6587\u751f\u6210\u4e00\u4e2a\u9002\u5408\u68c0\u7d22\u7684\u67e5\u8be2\u3002\u201d\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>prompt = ChatPromptTemplate.from_messages(&#91;\n    MessagesPlaceholder(variable_name=\"chat_history\"),\n    (\"user\", \"{input}\"),\n    (\"user\", \"\u9274\u4e8e\u4e0a\u8ff0\u5bf9\u8bdd\uff0c\u751f\u6210\u4e00\u4e2a\u641c\u7d22\u67e5\u8be2\u4ee5\u67e5\u627e\u4ee5\u83b7\u53d6\u4e0e\u5bf9\u8bdd\u76f8\u5173\u7684\u4fe1\u606f\")\n])<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc\u6211\u4eec\u6784\u5efa\u5bf9\u8bdd\u611f\u77e5\u7684 Retriever \u94fe\uff0c\u5229\u7528 LLM \u6765\u201c\u7406\u89e3\u201d\u6574\u4e2a\u5bf9\u8bdd\u4e0a\u4e0b\u6587\uff0c\u751f\u6210\u4e00\u4e2a\u5408\u9002\u7684\u641c\u7d22\u67e5\u8be2\uff08\u5982\uff1aLangSmith \u6d4b\u8bd5\u65b9\u6cd5\uff09\uff0c\u7136\u540e\u4ea4\u7ed9\u5411\u91cf\u68c0\u7d22\u5668\uff08<code>retriever<\/code>\uff09\u53bb\u627e\u76f8\u5173\u6587\u6863<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>retriever_chain = create_history_aware_retriever(llm, retriever, prompt)<\/code><\/pre>\n\n\n\n<p>\u6211\u4eec\u53ef\u4ee5\u6d4b\u8bd5\u8fd9\u4e2a retriever_chain\uff0c\u8fd9\u91cc\u7684 &#8220;\u544a\u8bc9\u6211\u600e\u4e48\u505a&#8221; \u662f\u4e00\u4e2a\u975e\u5e38\u6a21\u7cca\u7684\u95ee\u9898\u3002\u4f46\u7531\u4e8e\u4e0a\u4e0b\u6587\u4e2d\u63d0\u5230\u4e86 \u201cLangSmith \u6d4b\u8bd5\u201d\uff0c\u6240\u4ee5\u68c0\u7d22\u94fe\u5c31\u53ef\u4ee5\u7406\u89e3\u672a\u201c\u6211\u60f3\u4e86\u89e3\u5982\u4f55\u4f7f\u7528 LangSmith \u6d4b\u8bd5 LLM \u5e94\u7528\u201d\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>chat_history = &#91;\n    HumanMessage(content=\"LangSmith \u53ef\u4ee5\u5e2e\u52a9\u6d4b\u8bd5\u6211\u7684 LLM \u5e94\u7528\u7a0b\u5e8f\u5417?\"),\n    AIMessage(content=\"Yes!\")\n]\nretriever_chain.invoke({\n    \"chat_history\": chat_history,\n    \"input\": \"\u544a\u8bc9\u6211\u600e\u4e48\u505a\"\n})<\/code><\/pre>\n\n\n\n<p>\u6784\u5efa\u6700\u7ec8\u7684\u5bf9\u8bdd\u68c0\u7d22\u94fe\uff08retrieval_chain\uff09\uff0c\u8fd9\u91cc\u7528 <code>retriever_chain<\/code> \u52a8\u6001\u751f\u6210\u68c0\u7d22\u7ed3\u679c\uff08\u57fa\u4e8e\u4e0a\u4e0b\u6587\u751f\u6210\u68c0\u7d22\u5173\u952e\u8bcd\uff09\uff0c\u7136\u540e\u628a\u8fd9\u4e9b\u6587\u6863 + chat history + \u7528\u6237\u5f53\u524d\u8f93\u5165\u4e00\u8d77\u4f20\u7ed9 LLM \u56de\u7b54\u95ee\u9898<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>prompt = ChatPromptTemplate.from_messages(&#91;\n    (\"system\", \"\u6839\u636e\u4ee5\u4e0b\u4e0a\u4e0b\u6587\u56de\u7b54\u7528\u6237\u7684\u95ee\u9898:\\n\\n{context}\"),\n    MessagesPlaceholder(variable_name=\"chat_history\"),\n    (\"user\", \"{input}\"),\n])\ndocument_chain = create_stuff_documents_chain(llm, prompt)\nretrieval_chain = create_retrieval_chain(retriever_chain, document_chain)\n<\/code><\/pre>\n\n\n\n<p>\u6700\u540e\u6267\u884c\u591a\u8f6e\u95ee\u7b54\uff0c\u8fd9\u4e2a\u8bf7\u6c42\u7684\u610f\u601d\u662f\uff1a\u201c\u57fa\u4e8e\u6211\u4eec\u4e4b\u524d\u7684\u5bf9\u8bdd\uff0c\u544a\u8bc9\u6211 LangSmith \u5982\u4f55\u5e2e\u52a9\u6d4b\u8bd5\u201d\u3002\u5b83\u4f1a\u5148\u68c0\u7d22\u76f8\u5173\u5185\u5bb9\uff0c\u518d\u751f\u6210\u56de\u7b54<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>chat_history = &#91;\n    HumanMessage(content=\"LangSmith \u53ef\u4ee5\u5e2e\u52a9\u6d4b\u8bd5\u6211\u7684 LLM \u5e94\u7528\u7a0b\u5e8f\u5417?\"),\n    AIMessage(content=\"Yes!\")\n]\nretrieval_chain.invoke({\n    \"chat_history\": chat_history,\n    \"input\": \"Tell me how\"\n})<\/code><\/pre>\n\n\n\n<p>\u5b8c\u6574\u7684\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import os\n\n# LangChain \u6a21\u5757\nfrom langchain_community.document_loaders import WebBaseLoader\nfrom langchain_text_splitters import RecursiveCharacterTextSplitter\nfrom langchain_community.vectorstores import FAISS\nfrom langchain_openai import ChatOpenAI, OpenAIEmbeddings\n\n# \u6784\u5efa\u94fe\u7528\u7684\u6a21\u5757\nfrom langchain.chains import create_retrieval_chain, create_history_aware_retriever\nfrom langchain.chains.combine_documents import create_stuff_documents_chain\nfrom langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder\nfrom langchain_core.messages import HumanMessage, AIMessage\n\n# === 1. \u52a0\u8f7d\u7f51\u9875\u6587\u6863 ===\nloader = WebBaseLoader(\"https:\/\/baike.baidu.com\/item\/%E6%B0%B8%E9%9B%8F%E5%A1%94%E8%8F%B2\/61675407\")\ndocs = loader.load()\n\n# === 2. \u5206\u5272\u6587\u6863 ===\ntext_splitter = RecursiveCharacterTextSplitter()\ndocuments = text_splitter.split_documents(docs)\n\n# === 3. \u5d4c\u5165\u6a21\u578b &amp; \u5411\u91cf\u5b58\u50a8 ===\nembeddings = OpenAIEmbeddings(\n    api_key=\"\u4f60\u7684OpenAI Key\",\n    base_url=\"https:\/\/api.gptgod.online\/v1\/\"\n)\nvectorstore = FAISS.from_documents(documents, embeddings)\n\n# === 4. \u521d\u59cb\u5316 LLM ===\nllm = ChatOpenAI(\n    api_key=\"\u4f60\u7684OpenAI Key\",\n    base_url=\"https:\/\/api.gptgod.online\/v1\/\"\n)\n\n# === 5. \u6784\u5efa\u5386\u53f2\u611f\u77e5\u68c0\u7d22\u5668 ===\nretriever = vectorstore.as_retriever()\n\nhistory_prompt = ChatPromptTemplate.from_messages(&#91;\n    MessagesPlaceholder(variable_name=\"chat_history\"),\n    (\"user\", \"{input}\"),\n    (\"user\", \"\u9274\u4e8e\u4e0a\u8ff0\u5bf9\u8bdd\uff0c\u751f\u6210\u4e00\u4e2a\u641c\u7d22\u67e5\u8be2\u4ee5\u67e5\u627e\u4e0e\u5bf9\u8bdd\u76f8\u5173\u7684\u4fe1\u606f\")\n])\nhistory_aware_retriever = create_history_aware_retriever(llm, retriever, history_prompt)\n\n# === 6. \u6784\u5efa\u56de\u7b54\u94fe ===\nresponse_prompt = ChatPromptTemplate.from_messages(&#91;\n    (\"system\", \"\u6839\u636e\u4ee5\u4e0b\u4e0a\u4e0b\u6587\u56de\u7b54\u7528\u6237\u7684\u95ee\u9898:\\n\\n{context}\"),\n    MessagesPlaceholder(variable_name=\"chat_history\"),\n    (\"user\", \"{input}\"),\n])\ndocument_chain = create_stuff_documents_chain(llm, response_prompt)\n\n# === 7. \u6700\u7ec8\u5bf9\u8bdd\u68c0\u7d22\u94fe ===\nconversational_chain = create_retrieval_chain(history_aware_retriever, document_chain)\n\n# === 8. \u793a\u4f8b\u5bf9\u8bdd ===\nchat_history = &#91;\n    HumanMessage(content=\"\u6c38\u96cf\u5854\u83f2\u662f\u8c01\uff1f\"),\n    AIMessage(content=\"\u6c38\u96cf\u5854\u83f2\u662f\u4e00\u4f4d\u865a\u62df\u4e3b\u64ad\u3002\")\n]\n\n# \u7528\u6237\u7ee7\u7eed\u63d0\u95ee\nquery = \"\u5979\u7684\u51fa\u9053\u65f6\u95f4\u662f\uff1f\"\n\n# === 9. \u6267\u884c\u67e5\u8be2 ===\nresponse = conversational_chain.invoke({\n    \"chat_history\": chat_history,\n    \"input\": query\n})\n\n# === 10. \u8f93\u51fa\u7ed3\u679c ===\nprint(\"\\n\u3010\u95ee\u9898\u3011\uff1a\", query)\nprint(\"\u3010\u56de\u7b54\u3011\uff1a\", response&#91;\"answer\"])<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\u867d\u7136\u6211\u4eec\u7528\u4e86&#8221;\u5979\u7684\u51fa\u9053\u65f6\u95f4\u662f\uff1f&#8221;\u8fd9\u79cd\u6a21\u7cca\u7684\u8868\u8fbe\uff0cllm\u8fd8\u662f\u8bc6\u522b\u51fa\u6765\u6211\u4eec\u95ee\u7684\u5176\u5b9e\u662f\u6c38\u96cf\u5854\u83f2\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2025%2F04%2FQQ20250507-164720-7-5.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2025%2F04%2FQQ20250507-164720-7-5.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<h1 class=\"wp-block-heading\">\u4ee3\u7406\u7684\u4f7f\u7528<\/h1>\n\n\n\n<p>\u4ee3\u7406\u662f LangChain\u4e2d\u7684\u6838\u5fc3\u673a\u5236\uff0c\u901a\u8fc7\u201c\u4ee3\u7406\u201d\u8ba9\u5927\u6a21\u578b\u81ea\u4e3b\u8c03\u7528\u5916\u90e8\u5de5\u5177\u548c\u5185\u90e8\u5de5\u5177\uff0c\u4f7f\u667a\u80fdAgent\u6210\u4e3a\u53ef\u80fd\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u521b\u5efa\u641c\u7d22\u5de5\u5177<\/h2>\n\n\n\n<p>\u8bbf\u95ee<a href=\"https:\/\/link.juejin.cn\/?target=https%3A%2F%2Fapp.tavily.com%2Fhome\" target=\"_blank\" rel=\"noreferrer noopener\">Tavily<\/a>\uff0c\u6ce8\u518c\u8d26\u53f7\u767b\u5f55\u5e76\u521b\u5efaAPI\u79d8\u94a5\uff0c\u7136\u540e\u914d\u7f6e\u73af\u5883\u53d8\u91cf<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import os\n\nos.environ&#91;\"TAVILY_API_KEY\"] = 'tvly-ScxxxxxxxM8'<\/code><\/pre>\n\n\n\n<p>\u5b89\u88c5tavily-python\u5e93<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>pip install -U langchain-community tavily-python<\/code><\/pre>\n\n\n\n<p>\u521b\u5efa\u5de5\u5177<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from langchain_community.tools.tavily_search import TavilySearchResults\n\nsearch = TavilySearchResults()<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u5b8c\u6574\u7684Agent\u4ee3\u7801<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>import os\nfrom langchain_community.tools.tavily_search import TavilySearchResults\nfrom langchain_openai import ChatOpenAI\nfrom langchain.agents import initialize_agent, AgentType\n\n# \u914d\u7f6e API KEY \u4e0e BASE\nOPENAI_API_KEY = \"sk-xx\"\nOPENAI_API_BASE = \"https:\/\/api.gptgod.online\/v1\/\"\n\nos.environ&#91;\"OPENAI_API_KEY\"] = OPENAI_API_KEY\nos.environ&#91;\"OPENAI_API_BASE\"] = OPENAI_API_BASE\nos.environ&#91;\"TAVILY_API_KEY\"] = 'tvly-dev-xxxx'\n\n# \u521d\u59cb\u5316\u5de5\u5177\nsearch = TavilySearchResults()\ntools = &#91;search]\n\n# \u521d\u59cb\u5316\u6a21\u578b\nllm = ChatOpenAI(\n    model=\"gpt-3.5-turbo\",\n    temperature=0,\n    api_key=OPENAI_API_KEY,\n    base_url=OPENAI_API_BASE\n)\n\n# \u4f7f\u7528\u6807\u51c6 AgentType.ZERO_SHOT_REACT_DESCRIPTION \u907f\u514d Function Call\nagent_executor = initialize_agent(\n    tools,\n    llm,\n    agent=AgentType.ZERO_SHOT_REACT_DESCRIPTION,\n    verbose=True\n)\n\n# \u6267\u884c\nresponse = agent_executor.invoke({\"input\": \"\u6210\u90fd\u4eca\u5929\u5929\u6c14\u60c5\u51b5\uff1f\"})\nprint(response)\n<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2025%2F04%2FQQ20250507-175936-7-6.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2025%2F04%2FQQ20250507-175936-7-6.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<p>\u8fd9\u6837\u5728\u9047\u5230\u5929\u6c14\u6709\u5173\u7684\u8bdd\u9898\uff0cllm\u5c31\u4f1a\u81ea\u52a8\u8c03\u7528\u521b\u5efa\u597d\u7684\u5de5\u5177\u5b8c\u6210\u6211\u4eec\u7684\u63d0\u95ee\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">LangServe\u63d0\u4f9b\u670d\u52a1<\/h1>\n\n\n\n<p>LangServe \u662f LangChain \u63d0\u4f9b\u7684\u4e00\u4e2a\u90e8\u7f72\u5de5\u5177\uff0c\u53ef\u4ee5\u5c06\u4f60\u5199\u7684 Chain\/Agent \u5feb\u901f\u5305\u88c5\u6210\u4e00\u4e2a\u57fa\u4e8e FastAPI \u7684 Web \u670d\u52a1\uff0c\u5e76\u81ea\u52a8\u751f\u6210\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>REST API \u8def\u7531<\/li>\n\n\n\n<li>OpenAPI \u6587\u6863\uff08<code>\/docs<\/code>\uff09<\/li>\n\n\n\n<li>Chat Playground \u754c\u9762\uff08<code>\/agent\/playground\/<\/code>\uff09<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u521b\u5efa\u670d\u52a1<\/h2>\n\n\n\n<p>\u9996\u5148\u5b89\u88c5langserve\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>python -m pip install \"langserve&#91;all]\"<\/code><\/pre>\n\n\n\n<p>server\u7531\u4e09\u90e8\u5206\u7ec4\u6210\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6784\u5efa\u7684\u94fe\u7684\u5b9a\u4e49 <\/li>\n\n\n\n<li>FastAPI\u5e94\u7528\u7a0b\u5e8f <\/li>\n\n\n\n<li>\u4e3a\u94fe\u63d0\u4f9b\u670d\u52a1\u7684\u8def\u7531\u7684\u5b9a\u4e49\uff0c\u7531langserve.add_routes\u547d\u4ee4\u5b8c\u6210<\/li>\n<\/ul>\n\n\n\n<p>\u6211\u4eec\u53ea\u9700\u8981\u5728\u539f\u672c\u7684agent\u7684\u57fa\u7840\u4e0a\u6dfb\u52a0Web \u670d\u52a1 + \u8def\u7531\uff08FastAPI\uff09<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>app = FastAPI(...)\n\nclass Input(BaseModel):\n    input: str\n    chat_history: List&#91;BaseMessage]\n\nclass Output(BaseModel):\n    output: str\n\nadd_routes(\n    app,\n    agent_executor.with_types(input_type=Input, output_type=Output),\n    path=\"\/agent\",\n)\n<\/code><\/pre>\n\n\n\n<p>\u63a5\u7740\u542f\u52a8\u670d\u52a1\uff0c\u8fd9\u6837\u6211\u4eec\u5c31\u53ef\u4ee5\u8bbf\u95ee<code>\/agent\/playground\/<\/code>\uff0c\u4e00\u4e2a\u5e26 UI \u7684 Agent Playground \u6765\u8fdb\u884c\u4ea4\u4e92\u95ee\u7b54<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>uvicorn.run(app, host=\"localhost\", port=8000)<\/code><\/pre>\n\n\n\n<p>\u5b8c\u6574\u7684\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import os\nfrom fastapi import FastAPI\nfrom pydantic import BaseModel\nfrom typing import Any\n\nfrom langchain_community.tools.tavily_search import TavilySearchResults\nfrom langchain_openai import ChatOpenAI\nfrom langchain.agents import initialize_agent, AgentType\nfrom langserve import add_routes\n\n# \u73af\u5883\u914d\u7f6e\nOPENAI_API_KEY = \"sk-xxx\"\nOPENAI_API_BASE = \"https:\/\/api.gptgod.online\/v1\/\"\n\nos.environ&#91;\"OPENAI_API_KEY\"] = OPENAI_API_KEY\nos.environ&#91;\"OPENAI_API_BASE\"] = OPENAI_API_BASE\nos.environ&#91;\"TAVILY_API_KEY\"] = \"tvly-dev-xxxx\"\n\n# \u5de5\u5177\u548c\u6a21\u578b\u521d\u59cb\u5316\nsearch = TavilySearchResults()\ntools = &#91;search]\n\nllm = ChatOpenAI(\n    model=\"gpt-3.5-turbo\",\n    temperature=0,\n    api_key=OPENAI_API_KEY,\n    base_url=OPENAI_API_BASE\n)\n\nagent_executor = initialize_agent(\n    tools,\n    llm,\n    agent=AgentType.ZERO_SHOT_REACT_DESCRIPTION,\n    verbose=True,\n    handle_parsing_errors=True \n)\n\n# FastAPI \u5e94\u7528\napp = FastAPI(\n    title=\"LangServe Agent\",\n    version=\"1.0\"\n)\n\n# \u8bf7\u6c42\/\u54cd\u5e94\u6a21\u578b\nclass Input(BaseModel):\n    input: str\n    chat_history: Any = &#91;]\n\nclass Output(BaseModel):\n    output: str\n\n# \u6dfb\u52a0 LangServe \u8def\u7531\nadd_routes(\n    app,\n    runnable=agent_executor.with_types(input_type=Input, output_type=Output),\n    path=\"\/agent\"\n)\n\n# \u542f\u52a8\u5165\u53e3\nif __name__ == \"__main__\":\n    import uvicorn\n    uvicorn.run(app, host=\"localhost\", port=8000)<\/code><\/pre>\n\n\n\n<p>\u542f\u52a8\u540e\u8bbf\u95ee<a href=\"http:\/\/localhost:8000\/agent\/playground\/\">http:\/\/localhost:8000\/agent\/playground\/<\/a>\uff0c\u5c31\u53ef\u4ee5\u5728\u8fd9\u91cc\u8fdb\u884c\u5b9e\u65f6\u7684\u5bf9\u8bdd\uff0c\u6bd4\u5982\u8be2\u95ee&#8221;\u6210\u90fd\u4eca\u5929\u7684\u5929\u6c14\u5982\u4f55&#8221;,\u5c31\u4f1a\u5728\u9875\u9762\u83b7\u5f97\u7ed3\u679c\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2025%2F04%2FQQ20250507-181526-7-7.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2025%2F04%2FQQ20250507-181526-7-7.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" style=\"width:840px;height:auto\"\/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u5ba2\u6237\u7aef\u4ea4\u4e92<\/h2>\n\n\n\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u63a5\u53e3\u6765\u4fbf\u6377\u7684\u83b7\u53d6\u670d\u52a1\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import requests\n\ndata = {\n    \"input\": {\n        \"chat_history\": &#91;],\n        \"input\": \"\u4eca\u5929\u661f\u671f\u51e0\"\n    },\n}\n\nresponse = requests.post(\n    \"http:\/\/localhost:8000\/agent\/invoke\",\n    json=data\n)\n\nprint(response.json())<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2025%2F04%2FQQ20250507-185412-7-8.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2025%2F04%2FQQ20250507-185412-7-8.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<p>\u6216\u8005\u76f4\u63a5\u4f7f\u7528\u539f\u751f\u7684\uff08\u8bb0\u5f97\u4e0d\u8981\u6302\u4ee3\u7406\uff0c\u4e0d\u7136\u8bf7\u6c42\u4e0d\u4e86\uff09\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from langserve import RemoteRunnable\n\nremote_chain = RemoteRunnable(\"http:\/\/localhost:8000\/agent\/\")\nres = remote_chain.invoke({\n    \"input\": \"\u6210\u90fd\u4eca\u5929\u5929\u6c14\u60c5\u51b5\u600e\u6837?\",\n    \"chat_history\": &#91;]\n})\nprint(res)<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">\u53c2\u8003<\/h1>\n\n\n\n<p><a href=\"https:\/\/juejin.cn\/post\/7358633811515146278#heading-13\">\u521d\u8bc6LangChain\u7684\u5feb\u901f\u5165\u95e8\u6307\u5357<\/a><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>LangChain \u6982\u8ff0 LangChain \u662f\u4e00\u4e2a\u7528\u4e8e\u6784\u5efa\u57fa\u4e8e\u5927\u8bed\u8a00\u6a21\u578b\uff08LLM\uff09\u7684\u5e94\u7528\u7a0b\u5e8f\u7684 Python [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"class_list":["post-3689","post","type-post","status-publish","format-standard","hentry","category-llm"],"_links":{"self":[{"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/posts\/3689","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/comments?post=3689"}],"version-history":[{"count":5,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/posts\/3689\/revisions"}],"predecessor-version":[{"id":3694,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/posts\/3689\/revisions\/3694"}],"wp:attachment":[{"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/media?parent=3689"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/categories?post=3689"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/tags?post=3689"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}