{"id":19719,"date":"2025-01-30T10:34:34","date_gmt":"2025-01-30T02:34:34","guid":{"rendered":"https:\/\/www.aisharenet.com\/?p=19719"},"modified":"2025-01-30T10:34:34","modified_gmt":"2025-01-30T02:34:34","slug":"langgraph","status":"publish","type":"post","link":"https:\/\/www.kdjingpai.com\/de\/langgraph\/","title":{"rendered":"LangGraph\uff1a\u57fa\u4e8e\u6709\u5411\u65e0\u73af\u56fe\u62d3\u6251\u7684AI Agent\u6784\u5efa\u4e0e\u6267\u884c\u6846\u67b6"},"content":{"rendered":"<p>\u4eba\u5de5\u667a\u80fd\uff08AI\uff09\u662f\u4e00\u4e2a\u8fc5\u901f\u53d1\u5c55\u7684\u9886\u57df\u3002\u8bed\u8a00\u6a21\u578b\u5df2\u7ecf\u53d1\u5c55\u5230\u80fd\u591f\u8ba9AI Agent\u6267\u884c\u590d\u6742\u4efb\u52a1\u548c\u505a\u51fa\u590d\u6742\u51b3\u7b56\u3002\u7136\u800c\uff0c\u968f\u7740\u8fd9\u4e9bAgent\u7684\u6280\u80fd\u4e0d\u65ad\u63d0\u5347\uff0c\u652f\u6301\u5b83\u4eec\u7684\u57fa\u7840\u8bbe\u65bd\u96be\u4ee5\u8ddf\u4e0a\u3002<\/p>\n<p>LangGraph\uff0c\u8fd9\u662f\u4e00\u4e2a\u9769\u547d\u6027\u7684\u5e93\uff0c\u65e8\u5728\u9769\u65b0AI Agent\u7684\u00a0<strong>\u6784\u5efa\u548c\u8fd0\u884c\u65f6<\/strong>\u00a0\u6267\u884c\u3002<\/p>\n<p>LangGraph \u63d0\u51fa\u4e86\u4e00\u4e2a\u65b0\u7684Agent<strong>\u6784\u5efa\u548c\u8fd0\u884c\u65f6<\/strong>\u6784\u9020\u8303\u5f0f\uff0c\u5b83\u5c06Agent\u5de5\u4f5c\u6d41\u89c6\u4e3a\u57fa\u4e8e\u5faa\u73af\u56fe\u62d3\u6251\u7684\u7ed3\u6784\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2>LangGraph \u662f\u4ec0\u4e48<\/h2>\n<p>LangChain \u7684\u4e00\u4e2a\u91cd\u8981\u4ef7\u503c\u4e3b\u5f20\u662f\u80fd\u591f\u8f7b\u677e\u521b\u5efa\u81ea\u5b9a\u4e49\u94fe\u3002\u7136\u800c\uff0cLangChain \u7f3a\u4e4f\u4e00\u79cd\u7b80\u5355\u7684\u65b9\u6cd5\u6765\u5728\u8fd9\u4e9b\u94fe\u4e2d\u5f15\u5165\u5faa\u73af\u3002\u5b9e\u9645\u4e0a\uff0c\u8fd9\u4e9b\u94fe\u662f\u6709\u5411\u65e0\u73af\u56fe\uff08<a href=\"https:\/\/www.kdjingpai.com\/workflow\/\">DAG<\/a>\uff09\u2014\u2014 \u5c31\u50cf\u5927\u591a\u6570\u6570\u636e\u7f16\u6392\u6846\u67b6\u4e00\u6837\u3002<\/p>\n<p>\u4eba\u4eec\u6784\u5efa\u590d\u6742\u7684LLM\u5e94\u7528\u65f6\u5e38\u89c1\u7684\u4e00\u4e2a\u6a21\u5f0f\u662f\uff1a\u5728\u8fd0\u884c\u65f6\u4e2d\u5f15\u5165\u5faa\u73af\u3002\u8fd9\u4e9b\u5faa\u73af\u5e38\u5e38\u501f\u52a9LLM\u6765\u63a8\u7406\u5faa\u73af\u4e2d\u7684\u4e0b\u4e00\u6b65\u884c\u52a8\u3002\u8fd9\u672c\u8d28\u4e0a\u76f8\u5f53\u4e8e\u5728for\u5faa\u73af\u4e2d\u8fd0\u884cLLM\u3002\u8fd9\u7c7b\u7cfb\u7edf\u901a\u5e38\u88ab\u79f0\u4e3aAgent\u3002<\/p>\n<p>\u6700\u7b80\u5355\u7684\u5f62\u5f0f\u662f\u4e00\u4e2a\u6709\u4e24\u4e2a\u6b65\u9aa4\u7684\u5faa\u73af\uff1a<\/p>\n<ol>\n<li>\u8c03\u7528LLM\u786e\u5b9a\u91c7\u53d6\u54ea\u4e9b\u884c\u52a8\uff0c\u6216\u7ed9\u7528\u6237\u4ec0\u4e48\u56de\u5e94<\/li>\n<li>\u6267\u884c\u7ed9\u5b9a\u7684\u64cd\u4f5c\uff0c\u7136\u540e\u8fd4\u56de\u5230\u7b2c 1 \u6b65<\/li>\n<\/ol>\n<p>\u8fd9\u4e9b\u6b65\u9aa4\u4f1a\u91cd\u590d\uff0c\u76f4\u5230\u751f\u6210\u6700\u7ec8\u54cd\u5e94\u3002\u8fd9\u5c31\u662f\u9a71\u52a8 LangChain\u6838\u5fc3AgentExecutor \u7684\u5faa\u73af\uff0c\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u7b80\u5355\u7684\u5faa\u73af,\u4e5f\u6700\u5173\u952e\uff0c\u662f\u56e0\u4e3a\u901a\u8fc7\u5b83\u5c06\u51e0\u4e4e\u6240\u6709\u7684\u51b3\u7b56\u548c\u63a8\u7406\u80fd\u529b\u4ea4\u7ed9\u4e86LLM\u3002<\/p>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u901a\u5e38\u9700\u8981\u66f4\u591a\u7684\u63a7\u5236\u3002\u6bd4\u5982\u5f3a\u5236Agent\u9996\u5148\u8c03\u7528\u7279\u5b9a\u5de5\u5177\u3001\u5bf9\u5de5\u5177\u7684\u8c03\u7528\u65b9\u5f0f\u505a\u66f4\u591a\u63a7\u5236\u3001\u6839\u636eAgent\u6240\u5904\u7684\u72b6\u6001\u505a\u4e0d\u540c\u7684\u63d0\u793a\u7b49<\/p>\n<p>\u8fd9\u4e9b\u53d7\u63a7\u7684\u6d41\u7a0b\uff0cLangChain\u79f0\u4e4b\u4e3a\u201c\u72b6\u6001\u673a\u201d<\/p>\n<p>\u8fd9\u4e9b\u72b6\u6001\u673a\u5177\u6709\u5faa\u73af\u7684\u80fd\u529b,\u7136\u800c\uff0c\u5728\u8be5\u5faa\u73af\u7684\u6784\u9020\u65b9\u9762\uff0c\u9700\u8981\u4e00\u5b9a\u7684\u4eba\u5de5\u5e72\u9884\u3002<\/p>\n<p>LangGraph \u662f\u901a\u8fc7\u5c06\u8fd9\u4e9b\u72b6\u6001\u673a\u6307\u5b9a\u4e3a\u56fe\u7684\u65b9\u5f0f\u6765\u521b\u5efa\u5b83\u4eec\u3002<\/p>\n<p>LangGraph \u5efa\u7acb\u5728 LangChain \u57fa\u7840\u4e0a\uff0c\u5e76\u4e0e LangChain \u751f\u6001\u7cfb\u7edf\u5b8c\u5168<strong>\u4e92\u64cd\u4f5c<\/strong>\u3002\u5b83\u4e3b\u8981\u901a\u8fc7\u5f15\u5165\u4e00\u79cd\u7b80\u5355\u7684\u65b9\u6cd5\u6765\u521b\u5efa\u5faa\u73af\u56fe\u800c\u589e\u52a0\u4e86\u65b0\u4ef7\u503c\u3002\u8fd9\u5728\u521b\u5efaAgent runtimes\u662f\u975e\u5e38\u6709\u7528\u7684\u3002<\/p>\n<p>\u8fd9\u79cd\u65b9\u6cd5\u4f7fAgent\u80fd\u591f\u5c55\u73b0\u51fa\u6bd4\u5176\u524d\u8f88\u7684\u7ebf\u6027\u6267\u884c\u6a21\u578b\u66f4\u591a\u7684\u53ef\u53d8\u4e14\u7ec6\u5fae\u7684\u884c\u4e3a\u3002\u5229\u7528\u56fe\u8bba\uff0cLangGraph\u4e3a\u5f00\u53d1\u590d\u6742\u7684\u7f51\u7edc\u5316Agent\u7cfb\u7edf\u63d0\u4f9b\u4e86\u65b0\u7684\u9014\u5f84\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.kdjingpai.com\/wp-content\/uploads\/2025\/01\/9cb664a481b0b15.png\" \/> \u56fe\uff1a\u4e00\u4e2a\u7528\u4e8e\u751f\u6210\u4ee3\u7801\u7684LangGraph<\/p>\n<h3>\u4e00\u4e2a\u4f8b\u5b50\uff1a\u52a8\u6001\u95ee\u7b54\u7cfb\u7edf<\/h3>\n<p><strong>\u573a\u666f<\/strong>\u00a0\uff1a\u7528\u6237\u53ef\u80fd\u662f\u4e00\u6b65\u4e00\u6b65\u7684\u63d0\u4f9b\u7ed9\u6a21\u578b\u4fe1\u606f\uff0c\u800c\u4e0d\u662f\u4e00\u6b21\u6027\u53d1\u9001\u6240\u6709\u7684\u4fe1\u606f\u3002<\/p>\n<p><strong>\u89e3\u51b3\u65b9\u6848<\/strong>\u00a0\uff1a\u4f7f\u7528\u5faa\u73af\u56fe\uff1a<\/p>\n<ol>\n<li>\u8ba9 LLM \u751f\u6210\u521d\u6b65\u56de\u7b54\u3002<\/li>\n<li>\u5982\u679c\u7b54\u6848\u4e0d\u5b8c\u6574\u6216\u9700\u8981\u66f4\u591a\u4fe1\u606f\uff0c\u751f\u6210\u65b0\u95ee\u9898\u5e76\u7ee7\u7eed\u8be2\u95ee\u7528\u6237\u3002<\/li>\n<li>\u76f4\u5230\u7528\u6237\u786e\u8ba4\u95ee\u9898\u5df2\u89e3\u51b3\u3002<\/li>\n<\/ol>\n<h3>\u5faa\u73af\u56fe\u7684\u7ed3\u6784<\/h3>\n<ul>\n<li><strong>\u8282\u70b9\uff08Nodes\uff09<\/strong>\uff1a \u6bcf\u4e2a\u8282\u70b9\u4ee3\u8868\u4e00\u4e2a\u5177\u4f53\u7684\u4efb\u52a1\u6216\u64cd\u4f5c\uff0c\u6bd4\u5982\u6587\u672c\u751f\u6210\u3001\u95ee\u9898\u56de\u7b54\u3001\u6570\u636e\u5904\u7406\u7b49\u3002<\/li>\n<li><strong>\u8fb9\uff08Edges\uff09<\/strong>\uff1a \u8282\u70b9\u4e4b\u95f4\u7684\u8fde\u63a5\u8868\u793a\u4efb\u52a1\u6267\u884c\u7684\u5148\u540e\u987a\u5e8f\uff0c\u53ef\u80fd\u5e26\u6709\u6761\u4ef6\u5224\u65ad\u3002<\/li>\n<li><strong>\u5faa\u73af\u8def\u5f84\uff08Looping Path\uff09<\/strong>\uff1a \u5f53\u67d0\u4e2a\u8282\u70b9\u7684\u8f93\u51fa\u9700\u8981\u53cd\u9988\u56de\u4e4b\u524d\u7684\u8282\u70b9\uff0c\u6216\u9700\u8981\u53cd\u590d\u6267\u884c\u65f6\uff0c\u5c31\u4f1a\u5f62\u6210\u5faa\u73af\u3002<\/li>\n<li><strong>\u7ec8\u6b62\u6761\u4ef6\uff08Stopping Condition\uff09<\/strong>\uff1a \u5faa\u73af\u56fe\u4f1a\u8bbe\u5b9a\u67d0\u79cd\u7ec8\u6b62\u6761\u4ef6\uff0c\u4f8b\u5982\u7ed3\u679c\u7684\u8d28\u91cf\u6ee1\u8db3\u8981\u6c42\u3001\u8fbe\u5230\u8bbe\u5b9a\u7684\u6b21\u6570\u9650\u5236\uff0c\u6216\u8005\u5916\u90e8\u89e6\u53d1\u7684\u505c\u6b62\u4fe1\u53f7\u3002<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2>\u4e3a\u4ec0\u4e48\u4f7f\u7528 LangGraph \uff1f<\/h2>\n<ul>\n<li><strong>\u7075\u6d3b\u6027<\/strong>\u00a0\uff1a\u968f\u7740AI Agent\u7684\u53d1\u5c55\uff0c\u5f00\u53d1\u8005\u9700\u8981\u5bf9Agent\u8fd0\u884c\u65f6\u8fdb\u884c\u66f4\u591a\u63a7\u5236\uff0c\u4ee5\u5b9e\u73b0\u4e2a\u6027\u5316\u7684\u884c\u52a8\u8ba1\u5212\u548c\u51b3\u7b56\u7a0b\u5e8f\u3002<\/li>\n<li><strong>AI\u63a8\u7406\u7684\u5faa\u73af\u6027\u8d28<\/strong>\u00a0\uff1a\u8bb8\u591a\u590d\u6742\u7684LLM\u5e94\u7528\u5728\u4f7f\u7528\u94fe\u5f0f\u63a8\u7406\u7b49\u7b56\u7565\u65f6\u4f9d\u8d56\u4e8e\u5faa\u73af\u6267\u884c\u3002LangGraph \u63d0\u4f9b\u4e86\u4e00\u4e2a\u81ea\u7136\u7684\u6846\u67b6\uff0c\u7528\u4e8e\u5efa\u6a21\u8fd9\u4e9b\u5faa\u73af\u8fc7\u7a0b\u3002<\/li>\n<li><strong>\u591a\u667a\u80fd\u4f53\u7cfb\u7edf<\/strong>\u00a0\uff1a\u968f\u7740\u591a\u667a\u80fd\u4f53\u5de5\u4f5c\u6d41\u53d8\u5f97\u8d8a\u6765\u8d8a\u666e\u904d\uff0c\u5bf9\u80fd\u591f\u9ad8\u6548\u7ba1\u7406\u548c\u534f\u8c03\u591a\u4e2a\u81ea\u4e3b\u667a\u80fd\u4f53\u7684\u7cfb\u7edf\u7684\u9700\u6c42\u4e5f\u5728\u589e\u52a0\u3002<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2>\u4f7f\u7528\u4ee3\u7801\u6765\u770b LangGraph \u5982\u4f55\u5de5\u4f5c<\/h2>\n<p>LangGraph \u7684\u529f\u80fd\u57fa\u4e8e\u51e0\u4e2a\u57fa\u672c\u5143\u7d20\uff1a<\/p>\n<ul>\n<li><strong>Nodes:<\/strong>\u00a0\u8fd9\u4e9b\u662f\u51fd\u6570\u6216Agent\u7684\u5de5\u5177\u3002<\/li>\n<li><strong>Edges:<\/strong>\u00a0\u5b9a\u4e49Agent\u7cfb\u7edf\u4e2d\u6267\u884c\u548c\u6570\u636e\u6d41\u5411\u7684\u8def\u5f84\uff0c\u8fde\u63a5\u8282\u70b9\u3002<\/li>\n<li><strong>StateGraph :<\/strong>\u00a0LangGraph \u901a\u8fc7\u7ba1\u7406\u548c\u66f4\u65b0\u72b6\u6001\u5bf9\u8c61\u6765\u5141\u8bb8\u5728\u6267\u884c\u5468\u671f\u4e4b\u95f4\u4fdd\u6301\u6301\u4e45\u6570\u636e\uff0c\u6570\u636e\u5728\u8282\u70b9\u4e4b\u95f4\u6d41\u52a8\u3002<\/li>\n<\/ul>\n<p><img \/>\u56fe\uff1aLangGraph\u7684\u57fa\u672c\u5de5\u4f5c\u6d41\u7a0b<\/p>\n<h3>StateGraph \u72b6\u6001\u56fe<\/h3>\n<p><code>StateGraph<\/code>\u00a0\u662f\u4e00\u4e2a\u8868\u793a\u56fe\u7684\u7c7b\u3002\u60a8\u901a\u8fc7\u4f20\u5165\u00a0<code>state<\/code>\u00a0\u5b9a\u4e49\u6765\u521d\u59cb\u5316\u6b64\u7c7b\u3002\u8be5\u72b6\u6001\u5b9a\u4e49\u8868\u793a\u4e00\u4e2a\u4e2d\u5fc3\u72b6\u6001\u5bf9\u8c61\uff0c\u968f\u7740\u65f6\u95f4\u7684\u63a8\u79fb\u4e0d\u65ad\u66f4\u65b0\u3002\u6b64\u72b6\u6001\u7531\u56fe\u4e2d\u7684\u8282\u70b9\u66f4\u65b0\uff0c\u8282\u70b9\u4ee5\u952e\u503c\u5b58\u50a8\u7684\u5f62\u5f0f\u8fd4\u56de\u5bf9\u8be5\u72b6\u6001\u5c5e\u6027\u7684\u64cd\u4f5c\u3002<\/p>\n<pre><code>import\u00a0os \u00a0# \u5bfc\u5165\u64cd\u4f5c\u7cfb\u7edf\u6a21\u5757\r\nos.environ['OpenAI_API_KEY'] =\u00a0'hk-iwtbi1e427'\r\nfrom\u00a0typing\u00a0import\u00a0Annotated\r\nfrom\u00a0typing_extensions\u00a0import\u00a0TypedDict\r\nfrom\u00a0langgraph.graph\u00a0import\u00a0StateGraph, START, END\r\nfrom\u00a0langgraph.graph.message\u00a0import\u00a0add_messages\r\nclass\u00a0State(TypedDict):\r\n\u00a0 \u00a0\u00a0# messages \u7684\u7c7b\u578b\u4e3a\u201clist\u201d\u3002Annotated\u4e2d\u7684\u201cadd_messages\u201d \u5b9a\u4e49\u4e86\u5982\u4f55\u66f4\u65b0messages\r\n\u00a0 \u00a0\u00a0# \u5728\u672c\u4f8b\u4e2d\uff0cmessages\u662f\u8ffd\u52a0\u5230list\u4e2d\u7684\uff0c\u800c\u4e0d\u662f\u8986\u76d6\r\n\u00a0 \u00a0 messages: Annotated[list, add_messages]\r\n# \u521b\u5efaStateGraph\u7684\u5b9e\u4f8b\uff0c\u4f20\u5165State\u7c7b\r\ngraph_builder = StateGraph(State)\r\n<\/code><\/pre>\n<h3>Nodes \u8282\u70b9<\/h3>\n<p>\u521b\u5efa\u4e00\u4e2a\u00a0<code>StateGraph<\/code>\u00a0\u540e\uff0c\u53ef\u4ee5\u4f7f\u7528\u00a0<code>graph.add_node(name, value)<\/code>\u00a0\u8bed\u6cd5\u6dfb\u52a0\u8282\u70b9\u3002\u00a0<code>name<\/code>\u00a0\u53c2\u6570\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u662f\u8282\u70b9name\u3002\u00a0<code>value<\/code>\u00a0\u53c2\u6570\u662f\u4e00\u4e2a\u51fd\u6570\u6216\u53ef\u8fd0\u884c\u7684 LCEL\uff0c\u5c06\u88ab\u8c03\u7528\u3002<\/p>\n<p>\u8fd9\u4e2a\u51fd\u6570\/LCEL \u63a5\u53d7\u4e00\u4e2a\u4e0e\u00a0<code>State<\/code>\u00a0\u5bf9\u8c61\u5177\u6709\u76f8\u540c\u5f62\u5f0f\u7684\u5b57\u5178\u4f5c\u4e3a\u8f93\u5165\uff0c\u5e76\u8f93\u51fa\u4e00\u4e2a\u4f7f\u7528\u00a0<code>State<\/code>\u00a0\u5bf9\u8c61\u7684\u952e\u6765\u66f4\u65b0\u7684\u5b57\u5178\u3002<\/p>\n<pre><code>from\u00a0langchain_openai\u00a0import\u00a0ChatOpenAI \u00a0# \u4ecelangchain_openai\u6a21\u5757\u5bfc\u5165ChatOpenAI\r\nllm = ChatOpenAI( \u00a0# \u521b\u5efaChatOpenAI\u7684\u5b9e\u4f8b\r\n\u00a0 \u00a0 model=\"gpt-4o-mini\", \u00a0# \u6307\u5b9a\u6a21\u578b\r\n\u00a0 \u00a0 temperature=0, \u00a0# \u8bbe\u7f6e\u6e29\u5ea6\r\n\u00a0 \u00a0 base_url=\"https:\/\/api.openai-hk.com\/v1\"# \u8bbe\u7f6e\u57fa\u7840URL\r\n)\r\ndef\u00a0chatbot(state: State):# \u5b9a\u4e49chatbot\u51fd\u6570\uff0c\u63a5\u53d7State\u7c7b\u578b\u7684\u53c2\u6570\r\n\u00a0 \u00a0\u00a0\"\"\"\r\n\u00a0 \u00a0 \u5904\u7406\u804a\u5929\u673a\u5668\u4eba\u8bf7\u6c42\u5e76\u8fd4\u56de\u6d88\u606f\u3002\r\n\u00a0 \u00a0 \u53c2\u6570:\r\n\u00a0 \u00a0 state (State): \u5305\u542b\u6d88\u606f\u7684\u72b6\u6001\u3002\r\n\u00a0 \u00a0 \u8fd4\u56de:\r\n\u00a0 \u00a0 dict: \u673a\u5668\u4eba\u751f\u6210\u7684\u6d88\u606f\u7684\u5b57\u5178\u3002\r\n\u00a0 \u00a0 \"\"\"\r\n\u00a0 \u00a0\u00a0return\u00a0{\"messages\": [llm.invoke(state[\"messages\"])]} \u00a0# \u8fd4\u56de\u5305\u542b\u6d88\u606f\u7684\u5b57\u5178\r\n# \u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u8282\u70b9name\r\n# \u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u88ab\u8c03\u7528\u7684\u51fd\u6570\u6216\u5bf9\u8c61\r\ngraph_builder.add_node(\"chatbot\", chatbot) \u00a0# \u5411\u56fe\u4e2d\u6dfb\u52a0\u8282\u70b9\uff0c\u8282\u70b9\u540d\u79f0\u4e3a\"chatbot\"\r\n<\/code><\/pre>\n<h3>Edges \u8fb9<\/h3>\n<p>\u8868\u793a\u5176\u4e2d\u4e00\u4e2a\u8282\u70b9\u59cb\u7ec8\u5728\u53e6\u4e00\u4e2a\u8282\u70b9\u4e4b\u540e\u88ab\u8c03\u7528<\/p>\n<pre><code># \u6dfb\u52a0\u4eceSTART\u5230\"chatbot\"\u7684\u8fb9\r\ngraph_builder.add_edge(START,\u00a0\"chatbot\") \u00a0\r\n# \u6dfb\u52a0\u4ece\"chatbot\"\u5230END\u7684\u8fb9\r\ngraph_builder.add_edge(\"chatbot\", END) \u00a0\r\n<\/code><\/pre>\n<h3>Compile \u7f16\u8bd1<\/h3>\n<p>\u5b9a\u4e49\u6211\u4eec\u7684\u56fe\u5f62\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u7f16\u8bd1\u4e3a\u53ef\u8fd0\u884c\u7684\uff01\u66b4\u9732\u4e0e LangChain \u76f8\u540c\u7684\u65b9\u6cd5\uff08\u00a0<code>.invoke<\/code>\u00a0\uff0c\u00a0<code>.stream<\/code>\u00a0\uff0c\u00a0<code>.astream_log<\/code>\u00a0\u7b49\uff09\uff0c\u5141\u8bb8\u4ee5\u4e0e\u94fe\u76f8\u540c\u7684\u65b9\u5f0f\u8c03\u7528\u5b83\u3002<\/p>\n<pre><code>graph = graph_builder.compile() \u00a0# \u7f16\u8bd1\u56fe\r\n<\/code><\/pre>\n<h3>\u8fd0\u884c<\/h3>\n<pre><code>def\u00a0stream_graph_updates(user_input: str):\u00a0\u00a0# \u5b9a\u4e49stream_graph_updates\u51fd\u6570\uff0c\u63a5\u53d7\u7528\u6237\u8f93\u5165\r\n\u00a0 \u00a0\u00a0\"\"\"\r\n\u00a0 \u00a0 \u4f7f\u7528user_input\u6d41\u5f0f\u66f4\u65b0\u56fe\u7684\u6d88\u606f\u3002\r\n\u00a0 \u00a0 \u53c2\u6570:\r\n\u00a0 \u00a0 user_input (str): \u7528\u6237\u8f93\u5165\u7684\u6d88\u606f\u3002\r\n\u00a0 \u00a0 \u8fd4\u56de:\r\n\u00a0 \u00a0 None\r\n\u00a0 \u00a0 \"\"\"\r\n\u00a0 \u00a0\u00a0# \u904d\u5386\u56fe\u7684\u6d41\u4e8b\u4ef6\uff0c\u4f20\u5165\u7528\u6237\u6d88\u606f\u4ee5\u83b7\u53d6\u6a21\u578b\u7684\u54cd\u5e94\r\n\u00a0 \u00a0\u00a0for\u00a0event\u00a0in\u00a0graph.stream({\"messages\": [(\"user\", user_input)]}): \u00a0# \u904d\u5386\u56fe\u7684\u6d41\u4e8b\u4ef6\r\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0for\u00a0value\u00a0in\u00a0event.values(): \u00a0# \u904d\u5386\u4e8b\u4ef6\u7684\u503c\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 print(\"Assistant:\", value[\"messages\"][-1].content) \u00a0# \u6253\u5370\u52a9\u624b\u7684\u6700\u540e\u4e00\u6761\u6d88\u606f\r\nwhileTrue:\r\n\u00a0 \u00a0\u00a0try:\r\n\u00a0 \u00a0 \u00a0 \u00a0 user_input = input(\"User: \") \u00a0# \u83b7\u53d6\u7528\u6237\u8f93\u5165\r\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0user_input.lower()\u00a0in\u00a0[\"quit\",\u00a0\"exit\",\u00a0\"q\"]: \u00a0# \u68c0\u67e5\u7528\u6237\u662f\u5426\u60f3\u9000\u51fa\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 print(\"Goodbye!\")\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0break# \u9000\u51fa\u5faa\u73af\r\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0# \u8c03\u7528stream_graph_updates\u51fd\u6570\u5904\u7406\u7528\u6237\u8f93\u5165\r\n\u00a0 \u00a0 \u00a0 \u00a0 stream_graph_updates(user_input)\r\n\u00a0 \u00a0\u00a0except: \u00a0# \u6355\u83b7\u5f02\u5e38\r\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0# fallback if input() is not available\r\n\u00a0 \u00a0 \u00a0 \u00a0 user_input =\u00a0\"What do you know about LangGraph?\"# \u8bbe\u7f6e\u9ed8\u8ba4\u7528\u6237\u8f93\u5165\r\n\u00a0 \u00a0 \u00a0 \u00a0 print(\"User: \"\u00a0+ user_input) \u00a0# \u6253\u5370\u7528\u6237\u8f93\u5165\r\n\u00a0 \u00a0 \u00a0 \u00a0 stream_graph_updates(user_input) \u00a0# \u8c03\u7528stream_graph_updates\u51fd\u6570\u5904\u7406\u9ed8\u8ba4\u8f93\u5165\r\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0break# \u9000\u51fa\u5faa\u73af\r\n<\/code><\/pre>\n<h3>\u53ef\u89c6\u5316\u201c\u56fe\u201d\uff08\u53ef\u9009\uff09<\/h3>\n<p>\u5728Jupyter Notebook\u73af\u5883\u4e2d\uff0c\u53ef\u89c6\u5316\u201c\u56fe\u201d<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.kdjingpai.com\/wp-content\/uploads\/2025\/01\/396a950a5a7f774.png\" \/><\/p>\n<h2>\u8fd0\u884c\u6548\u679c<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/www.kdjingpai.com\/wp-content\/uploads\/2025\/01\/d57b9cff264adca.gif\" \/><\/p>\n<p>\u50cfLangGraph\u8fd9\u6837\u7684\u6846\u67b6\u968f\u7740\u4eba\u5de5\u667a\u80fd\u7684\u53d1\u5c55\u53d8\u5f97\u8d8a\u6765\u8d8a\u91cd\u8981\u3002<\/p>\n<p>\u968f\u7740\u5f00\u53d1\u8005\u5bf9LangGraph\u7279\u6027\u7684\u66f4\u52a0\u719f\u6089\uff0c\u6211\u4eec\u53ef\u4ee5\u671f\u5f85\u770b\u5230\u66f4\u591a\u5148\u8fdb\u7684AI Agent\uff0c\u5b83\u4eec\u80fd\u591f\u6267\u884c\u66f4\u52a0\u590d\u6742\u7684\u4efb\u52a1\u3002<\/p>\n<p>\u603b\u4e4b\uff0cLangGraph\u5728AI Agent\u5f00\u53d1\u65b9\u9762\u662f\u4e00\u4e2a\u91cd\u5927\u7684\u8fdb\u6b65\u3002\u5b83\u901a\u8fc7\u6d88\u9664\u65e9\u671f\u7cfb\u7edf\u7684\u7f3a\u9677\uff0c\u5e76\u63d0\u4f9b\u4e00\u4e2a\u7528\u4e8eAgent\u6784\u5efa\u548c\u6267\u884c\u7684\u7075\u6d3b\u7684\u3001\u57fa\u4e8e\u56fe\u7684\u6846\u67b6\uff0c\u4f7f\u5f00\u53d1\u8005\u80fd\u591f\u63a8\u52a8AI Agent\u7684\u53ef\u80fd\u6027\u6781\u9650\u3002LangGraph\u5728\u672a\u6765\u6709\u6f5c\u529b\u663e\u8457\u5f71\u54cd\u4eba\u5de5\u667a\u80fd\u7684\u53d1\u5c55\u65b9\u5411\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4eba\u5de5\u667a\u80fd\uff08AI\uff09\u662f\u4e00\u4e2a\u8fc5\u901f\u53d1\u5c55\u7684\u9886\u57df\u3002\u8bed\u8a00\u6a21\u578b\u5df2\u7ecf\u53d1\u5c55\u5230\u80fd\u591f\u8ba9AI Agent\u6267\u884c\u590d\u6742\u4efb\u52a1\u548c\u505a\u51fa\u590d\u6742\u51b3\u7b56\u3002\u7136\u800c\uff0c\u968f\u7740\u8fd9\u4e9bAgent\u7684\u6280\u80fd\u4e0d\u65ad\u63d0\u5347\uff0c\u652f\u6301\u5b83\u4eec\u7684\u57fa\u7840\u8bbe\u65bd\u96be\u4ee5\u8ddf\u4e0a\u3002 LangGraph\uff0c\u8fd9\u662f\u4e00\u4e2a\u9769\u547d\u6027\u7684\u5e93\uff0c\u65e8\u5728\u9769\u65b0AI Agent&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34],"tags":[],"class_list":["post-19719","post","type-post","status-publish","format-standard","hentry","category-knowledge"],"_links":{"self":[{"href":"https:\/\/www.kdjingpai.com\/de\/wp-json\/wp\/v2\/posts\/19719","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.kdjingpai.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kdjingpai.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kdjingpai.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kdjingpai.com\/de\/wp-json\/wp\/v2\/comments?post=19719"}],"version-history":[{"count":0,"href":"https:\/\/www.kdjingpai.com\/de\/wp-json\/wp\/v2\/posts\/19719\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.kdjingpai.com\/de\/wp-json\/wp\/v2\/media?parent=19719"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kdjingpai.com\/de\/wp-json\/wp\/v2\/categories?post=19719"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kdjingpai.com\/de\/wp-json\/wp\/v2\/tags?post=19719"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}