{"id":16554,"date":"2026-06-10T07:52:11","date_gmt":"2026-06-09T23:52:11","guid":{"rendered":"https:\/\/ab123.xyz\/?p=16554"},"modified":"2026-06-10T07:52:11","modified_gmt":"2026-06-09T23:52:11","slug":"langchain-%e8%a1%a8%e8%be%be%e5%bc%8f%e8%af%ad%e8%a8%80%ef%bc%9a%e9%93%be%e5%bc%8f%e8%b0%83%e7%94%a8%e4%b8%8e%e5%8f%af%e8%a7%82%e6%b5%8b%e6%80%a7%e8%bf%bd%e8%b8%aa","status":"publish","type":"post","link":"https:\/\/ab123.xyz\/?p=16554","title":{"rendered":"LangChain \u8868\u8fbe\u5f0f\u8bed\u8a00\uff1a\u94fe\u5f0f\u8c03\u7528\u4e0e\u53ef\u89c2\u6d4b\u6027\u8ffd\u8e2a"},"content":{"rendered":"<p>\u5728\u4eba\u5de5\u667a\u80fd\u4e0e\u5927\u578b\u8bed\u8a00\u6a21\u578b\u5feb\u901f\u8fed\u4ee3\u7684\u5f53\u4e0b\uff0cLangChain \u8868\u8fbe\u5f0f\u8bed\u8a00\uff08LCEL\uff09\u51ed\u501f\u5176\u7b80\u6d01\u7684\u94fe\u5f0f\u8c03\u7528\u673a\u5236\u4e0e\u5f3a\u5927\u7684\u53ef\u89c2\u6d4b\u6027\u8ffd\u8e2a\u80fd\u529b\uff0c\u6210\u4e3a\u5f00\u53d1\u8005\u6784\u5efa\u667a\u80fd\u5e94\u7528\u7684\u9996\u9009\u5de5\u5177\u3002\u901a\u8fc7 LCEL\uff0c\u60a8\u53ef\u4ee5\u5c06\u63d0\u793a\u8bcd\u3001\u6a21\u578b\u8c03\u7528\u3001\u8f93\u51fa\u89e3\u6790\u7b49\u73af\u8282\u4e32\u8054\u4e3a\u4e00\u6761\u6e05\u6670\u7684\u6d41\u6c34\u7ebf\uff0c\u6781\u5927\u63d0\u5347\u5f00\u53d1\u6548\u7387\u3002\u5b98\u65b9\u94fe\u63a5\uff1a<a href=\"https:\/\/python.langchain.com\/v0.2\/docs\/how_to\/lcel_cheatsheet\/\" target=\"_blank\">\u5b98\u65b9\u7f51\u7ad9<\/a><\/p>\n<h2>\u6838\u5fc3\u529f\u80fd\uff1a\u94fe\u5f0f\u8c03\u7528\u7684\u4f18\u96c5\u8bed\u6cd5<\/h2>\n<p>LCEL \u7684\u6838\u5fc3\u5728\u4e8e\u5176\u58f0\u660e\u5f0f\u7684\u7ba1\u9053\u64cd\u4f5c\u7b26 <code>|<\/code>\uff0c\u5141\u8bb8\u5f00\u53d1\u8005\u50cf\u62fc\u63a5\u4e50\u9ad8\u79ef\u6728\u4e00\u6837\u7ec4\u5408\u4e0d\u540c\u7ec4\u4ef6\u3002\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\u5c06\u63d0\u793a\u6a21\u677f\u4e0e\u804a\u5929\u6a21\u578b\u8fde\u63a5\uff0c\u81ea\u52a8\u683c\u5f0f\u5316\u8f93\u5165\u3002<\/li>\n<li>\u8c03\u7528\u6a21\u578b\u540e\u76f4\u63a5\u63a5\u5165\u8f93\u51fa\u89e3\u6790\u5668\uff0c\u65e0\u9700\u624b\u52a8\u5904\u7406\u54cd\u5e94\u3002<\/li>\n<li>\u652f\u6301\u5e76\u884c\u5206\u652f\u4e0e\u6761\u4ef6\u8def\u7531\uff0c\u9002\u914d\u590d\u6742\u4e1a\u52a1\u903b\u8f91\u3002<\/li>\n<\/ul>\n<h3>\u4e0e Python \u539f\u751f\u8bed\u6cd5\u6df1\u5ea6\u6574\u5408<\/h3>\n<p>LCEL \u5b8c\u5168\u57fa\u4e8e Python \u7c7b\u578b\u7cfb\u7edf\u6784\u5efa\uff0c\u6240\u6709\u7ec4\u4ef6\u90fd\u662f\u53ef\u8c03\u7528\u5bf9\u8c61\uff0c\u5929\u7136\u652f\u6301\u7c7b\u578b\u63d0\u793a\u4e0e IDE \u81ea\u52a8\u8865\u5168\u3002\u8fd9\u4f7f\u5f97\u4ee3\u7801\u65e2\u5177\u5907\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u7b80\u6d01\u6027\uff0c\u53c8\u4e0d\u5931\u9762\u5411\u5bf9\u8c61\u7684\u7075\u6d3b\u6027\u3002<\/p>\n<h2>\u53ef\u89c2\u6d4b\u6027\u8ffd\u8e2a\uff1a\u5168\u94fe\u8def\u76d1\u63a7\u4e0e\u8c03\u8bd5<\/h2>\n<p>\u5728\u751f\u4ea7\u73af\u5883\u4e2d\uff0cLCEL \u63d0\u4f9b\u5185\u5efa\u7684\u8ffd\u8e2a\uff08Tracing\uff09\u80fd\u529b\uff0c\u901a\u8fc7 LangSmith \u5e73\u53f0\u53ef\u8bb0\u5f55\u6bcf\u4e00\u6b21\u94fe\u5f0f\u8c03\u7528\u7684\u8f93\u5165\u3001\u8f93\u51fa\u3001\u5ef6\u8fdf\u548c\u4e2d\u95f4\u72b6\u6001\u3002\u5f00\u53d1\u8005\u80fd\u591f\uff1a<\/p>\n<ul>\n<li>\u5feb\u901f\u5b9a\u4f4d\u6027\u80fd\u74f6\u9888\u6216\u9519\u8bef\u8282\u70b9\u3002<\/li>\n<li>\u57fa\u4e8e\u8ffd\u8e2a\u6570\u636e\u4f18\u5316\u63d0\u793a\u8bcd\u8bbe\u8ba1\u3002<\/li>\n<li>\u5b9e\u73b0\u5408\u89c4\u5ba1\u8ba1\u4e0e\u6210\u672c\u6838\u7b97\u3002<\/li>\n<\/ul>\n<h3>\u65e0\u4fb5\u5165\u5f0f\u96c6\u6210<\/h3>\n<p>\u53ea\u9700\u5728\u4ee3\u7801\u4e2d\u914d\u7f6e <code>LANGCHAIN_TRACING_V2=true<\/code>\uff0c\u6240\u6709 LCEL \u94fe\u5373\u53ef\u81ea\u52a8\u4e0a\u62a5\u8ffd\u8e2a\u6570\u636e\uff0c\u65e0\u9700\u4fee\u6539\u4e1a\u52a1\u903b\u8f91\u3002\u8ffd\u8e2a\u4fe1\u606f\u5305\u62ec\u6bcf\u4e00\u6b65\u7684 LLM \u8c03\u7528\u3001\u5de5\u5177\u4f7f\u7528\u8bb0\u5f55\u4ee5\u53ca\u81ea\u5b9a\u4e49\u6307\u6807\u3002<\/p>\n<h2>\u5e94\u7528\u573a\u666f\u4e0e\u4f18\u52bf<\/h2>\n<p>LCEL \u7279\u522b\u9002\u5408\u9700\u8981\u9ad8\u53ef\u9760\u6027\u3001\u53ef\u8c03\u8bd5\u6027\u7684 AI \u5e94\u7528\uff0c\u4f8b\u5982\u667a\u80fd\u95ee\u7b54\u673a\u5668\u4eba\u3001\u6587\u6863\u5206\u6790\u5f15\u64ce\u3001\u4ee3\u7801\u751f\u6210\u52a9\u624b\u7b49\u3002\u5176\u4f18\u52bf\u4f53\u73b0\u5728\uff1a<\/p>\n<ul>\n<li><strong>\u6a21\u5757\u5316\u590d\u7528<\/strong>\uff1a\u5df2\u5b9a\u4e49\u7684\u94fe\u53ef\u4ee5\u50cf\u666e\u901a\u51fd\u6570\u4e00\u6837\u88ab\u5d4c\u5957\u8c03\u7528\u3002<\/li>\n<li><strong>\u6d41\u5f0f\u8f93\u51fa<\/strong>\uff1a\u5929\u7136\u652f\u6301\u6d41\u5f0f\u751f\u6210\uff0c\u63d0\u5347\u7528\u6237\u4f53\u9a8c\u3002<\/li>\n<li><strong>\u5f02\u6b65\u652f\u6301<\/strong>\uff1a\u914d\u5408 asyncio \u5b9e\u73b0\u9ad8\u5e76\u53d1\u5904\u7406\u3002<\/li>\n<\/ul>\n<h3>\u5feb\u901f\u4e0a\u624b\u793a\u4f8b<\/h3>\n<p>\u501f\u52a9 LangChain \u5b98\u65b9\u6587\u6863\u4e2d\u7684\u7b80\u5355\u793a\u4f8b\uff0c\u4ec5\u7528\u51e0\u884c\u4ee3\u7801\u5373\u53ef\u6784\u5efa\u4e00\u4e2a\u7ffb\u8bd1\u94fe\uff1a<\/p>\n<p><code>from langchain_core.prompts import ChatPromptTemplate<\/code><br \/><code>from langchain_openai import ChatOpenAI<\/code><br \/><code>chain = ChatPromptTemplate.from_template('\u5c06\u4ee5\u4e0b\u5185\u5bb9\u7ffb\u8bd1\u6210{language}: {text}') | ChatOpenAI()<\/code><br \/><code>chain.invoke({'language':'\u4e2d\u6587', 'text':'Hello'})<\/code><\/p>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u65e0\u8bba\u662f\u65b0\u624b\u8fd8\u662f\u8d44\u6df1\u5f00\u53d1\u8005\uff0cLangChain \u8868\u8fbe\u5f0f\u8bed\u8a00\u90fd\u80fd\u5e2e\u52a9\u60a8\u4ee5\u66f4\u4f4e\u6210\u672c\u6784\u5efa\u9ad8\u8d28\u91cf LLM \u5e94\u7528\u3002\u7ed3\u5408\u53ef\u89c2\u6d4b\u6027\u8ffd\u8e2a\uff0c\u60a8\u53ef\u4ee5\u81ea\u4fe1\u5730\u5c06 AI \u529f\u80fd\u90e8\u7f72\u5230\u751f\u4ea7\u73af\u5883\u3002\u7acb\u5373\u8bbf\u95ee\u5b98\u65b9\u7f51\u7ad9\u83b7\u53d6\u5b8c\u6574\u6587\u6863\u4e0e\u793a\u4f8b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u4eba\u5de5\u667a\u80fd\u4e0e\u5927\u578b\u8bed\u8a00\u6a21\u578b\u5feb\u901f\u8fed\u4ee3\u7684\u5f53\u4e0b\uff0cLangChain \u8868\u8fbe\u5f0f\u8bed\u8a00\uff08LCEL\uff09\u51ed\u501f\u5176\u7b80\u6d01\u7684\u94fe\u5f0f\u8c03\u7528\u673a\u5236\u4e0e\u5f3a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[19603,19811,19814,19813,19812],"class_list":["post-16554","post","type-post","status-publish","format-standard","hentry","category-4","tag-ai","tag-langchain","tag-langsmith","tag-19813","tag-19812"],"_links":{"self":[{"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/posts\/16554","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ab123.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=16554"}],"version-history":[{"count":1,"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/posts\/16554\/revisions"}],"predecessor-version":[{"id":16555,"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/posts\/16554\/revisions\/16555"}],"wp:attachment":[{"href":"https:\/\/ab123.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=16554"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ab123.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=16554"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ab123.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=16554"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}