{"id":1316,"date":"2024-05-03T09:34:38","date_gmt":"2024-05-03T09:34:38","guid":{"rendered":"https:\/\/www.nicekj.com\/?p=1316"},"modified":"2024-05-03T09:34:46","modified_gmt":"2024-05-03T09:34:46","slug":"langchainxilie3langchainhexinmokuaijianjieer","status":"publish","type":"post","link":"https:\/\/www.nicekj.com\/langchainxilie3langchainhexinmokuaijianjieer.html","title":{"rendered":"\u3010LangChain\u7cfb\u5217 3\u3011LangChain\u6838\u5fc3\u6a21\u5757\u7b80\u4ecb(\u4e8c)"},"content":{"rendered":"<p><strong>\u539f\u6587\u94fe\u63a5\uff1a<a href=\"https:\/\/link.juejin.cn?target=https%3A%2F%2Fmp.weixin.qq.com%2Fs%2FiHypSB3_Ud2o9u3_YlCKFg\" target=\"_blank\" title=\"https:\/\/mp.weixin.qq.com\/s\/iHypSB3_Ud2o9u3_YlCKFg\" ref=\"nofollow noopener noreferrer\" rel=\"noopener\">\u3010LangChain\u7cfb\u5217 3\u3011LangChain\u6838\u5fc3\u6a21\u5757\u7b80\u4ecb(\u4e8c)<\/a><\/strong><\/p>\n<p>\u672c\u6587\u901f\u8bfb\uff1a<\/p>\n<ul>\n<li>\n<p>Memory<\/p>\n<\/li>\n<li>\n<p>Agents<\/p>\n<\/li>\n<li>\n<p>Callbacks<\/p>\n<\/li>\n<\/ul>\n<p><strong>04 Memory<\/strong><\/p>\n<p>\u7b80\u5355\u6765\u8bb2Memory\u5c31\u662f\u5bf9\u8bdd\u7684\u4e0a\u4e0b\u6587\uff0c\u5b83\u8bb0\u5f55\u7740\u5f53\u524d\u5bf9\u8bdd\u7684\u5185\u5bb9\u3001\u80cc\u666f\u7b49\u76f8\u5173\u4fe1\u606f\u3002\u81f3\u5c11\u5b83\u5e94\u8be5\u53ef\u4ee5\u8bbf\u95ee\u5230\u6700\u8fd1\u4e00\u6bb5\u65f6\u95f4\u7684Message\uff1b\u5bf9\u4e8e\u4e00\u4e2a\u590d\u6742\u7684\u7cfb\u7edf\uff0c\u5b83\u5e94\u8be5\u662f\u50cf\u771f\u5b9e\u4e16\u754c\u7684\u6a21\u578b\u4e00\u6837\uff0c\u968f\u7740\u5bf9\u8bdd\u7684\u4e0d\u65ad\u8fdb\u884c\uff0c\u5b83\u5e94\u8be5\u4e0d\u65ad\u5730\u66f4\u65b0\u5b83\u6240\u4e86\u89e3\u7684\u5b9e\u4f53\u4ee5\u53ca\u5b83\u4eec\u4e92\u76f8\u5173\u8054\u7684\u4fe1\u606f\uff0c\u8fd9\u79cd\u80fd\u529b\u5c31\u662fMemory\u3002<\/p>\n<p>LangChain\u63d0\u4f9b\u4e86\u5f88\u591a\u6a21\u5757\uff0c\u8fd9\u6837\u6211\u4eec\u53ef\u4ee5\u65b9\u4fbf\u5730\u5c06Memory\u589e\u52a0\u5230\u4e00\u4e2a\u7cfb\u7edf\u4e2d\u53bb\u3002Memory\u7cfb\u7edf\u9700\u8981\u6709\u4e24\u4e2a\u57fa\u7840\u7684\u80fd\u529b\uff1a\u8bfb\u548c\u5199\u3002<\/p>\n<ul>\n<li>\n<p>\u5728\u6536\u5230\u7528\u6237\u521d\u59cb\u8f93\u5165\u4e4b\u540e\uff0c\u4f46\u5728\u7ee7\u7eed\u6267\u884c\u6838\u5fc3\u903b\u8f91\u4e4b\u524d\uff0cChain\u4f1a\u5148\u53bb\u8bfb\u53d6Memory\u7cfb\u7edf\uff0c\u7136\u540e\u5c06\u5176\u8bfb\u53d6\u5230\u7684\u4fe1\u606f\u4e5f\u4f5c\u4e3a\u7528\u6237\u8f93\u5165\u7684\u4e00\u90e8\u5206\u3002<\/p>\n<\/li>\n<li>\n<p>\u5728\u6267\u884c\u5b8c\u6838\u5fc3\u903b\u8f91\u4e4b\u540e \uff0c\u4f46\u5728\u8fd4\u56de\u7ed3\u679c\u4e4b\u524d\uff0cChain\u4f1a\u5c06\u7528\u6237\u8f93\u5165\u548c\u5f53\u524d\u8f93\u51fa\u5199\u5230Momory\u7cfb\u7edf\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.nicekj.com\/wp-content\/uploads\/replace\/4be232a208f47ae01fe3e545345bf87c.png\" alt=\"\u3010LangChain\u7cfb\u5217 3\u3011LangChain\u6838\u5fc3\u6a21\u5757\u7b80\u4ecb(\u4e8c)\" \/><\/figure>\n<\/p>\n<p>\u4efb\u4f55\u4e00\u4e2aMemory\u7cfb\u7edf\u90fd\u9700\u8981\u8003\u8651\u4e24\u4e2a\u6838\u5fc3\u7684\u8bbe\u8ba1\uff1a<\/p>\n<ul>\n<li>\n<p>\u72b6\u6001\u600e\u4e48\u5b58\u50a8<\/p>\n<\/li>\n<li>\n<p>\u72b6\u6001\u600e\u4e48\u67e5\u8be2<\/p>\n<\/li>\n<\/ul>\n<p>\u5728LangChain\u4e2d\uff0c\u4e3b\u8981\u901a\u8fc7Chat Messages\u5217\u8868\u7684\u65b9\u5f0f\u6765\u5b58\u50a8\uff0c\u5176\u4e2dMemory\u6a21\u5757\u4e2d\u6709\u4e00\u4e2a\u5173\u952e\u7684\u90e8\u5206\u5c31\u662f\u96c6\u6210Chat Messages\u5b58\u50a8\u3002\u5b58\u50a8\u7684\u65b9\u5f0f\u5df2\u7ecf\u786e\u5b9a\uff0c\u63a5\u4e0b\u6765\u7684\u95ee\u9898\u5c31\u662f\u5982\u4f55\u67e5\u8be2\uff1f<\/p>\n<p>\u5728Chat Messages\u4e4b\u4e0a\uff0c\u901a\u8fc7\u4e0d\u540c\u7684\u6570\u636e\u7ed3\u6784\u548c\u7b97\u6cd5\uff0cLangChain\u5b9a\u4e49\u4e86\u5f88\u591aMemory\u7c7b\u578b\uff0c\u65b9\u4fbf\u6211\u4eec\u67e5\u8be2Messages\uff0c\u4e3b\u8981\u7c7b\u578b\u6709\uff1a<\/p>\n<ul>\n<li>\n<p>Conversation buffer memory<\/p>\n<\/li>\n<li>\n<p>Conversation buffer window memory<\/p>\n<\/li>\n<li>\n<p>Entity memory<\/p>\n<\/li>\n<li>\n<p>Conversation Knowledge Graph Memory<\/p>\n<\/li>\n<li>\n<p>Conversation summary memory<\/p>\n<\/li>\n<li>\n<p>ConversationSummaryBufferMemory<\/p>\n<\/li>\n<li>\n<p>ConversationTokenBufferMemory<\/p>\n<\/li>\n<li>\n<p>Vector store-backd memory<\/p>\n<\/li>\n<\/ul>\n<p>\u540e\u9762\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u7c7b\u578b\u7684\u4f7f\u7528\uff0c\u4e0b\u9762\u6211\u4eec\u5148\u770b\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff1a<\/p>\n<pre><\/div><div class=\"code-block-extension-headerRight\"><span class=\"code-block-extension-lang\">ini<\/span><div class=\"code-block-extension-copyCodeBtn\">\u590d\u5236\u4ee3\u7801<\/div><\/div><\/div><code class=\"hljs language-ini code-block-extension-codeShowNum\" lang=\"ini\"><span class=\"code-block-extension-codeLine\" data-line-num=\"1\">from langchain.chat_models import ChatOpenAI<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"2\">from langchain.prompts import (ChatPromptTemplate,<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"3\">                               MessagesPlaceholder,<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"4\">                               SystemMessagePromptTemplate,<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"5\">                               HumanMessagePromptTemplate)<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"6\">from langchain.chains import LLMChain<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"7\">from langchain.memory import ConversationBufferMemory\u200b\u200b<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"8\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"9\"><span class=\"hljs-attr\">llm<\/span> = ChatOpenAI(openai_api_key=<span class=\"hljs-string\">\"xxxxxxxx\"<\/span>)<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"10\"><span class=\"hljs-attr\">prompt<\/span> = ChatPromptTemplate(messages=[<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"11\">SystemMessagePromptTemplate.from_template(<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"12\">        <span class=\"hljs-string\">\"You are a nice chatbot having a conversation with a human.\"<\/span>),<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"13\">        <span class=\"hljs-comment\"># The `variable_name` here is what must align with memory<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"14\">        MessagesPlaceholder(variable_name=<span class=\"hljs-string\">\"chat_history\"<\/span>),<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"15\">        HumanMessagePromptTemplate.from_template(<span class=\"hljs-string\">\"{question}\"<\/span>)])<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"16\">        <span class=\"hljs-comment\"># Notice that we `return_messages=True` to fit into the MessagesPlaceholder<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"17\">        <span class=\"hljs-comment\"># Notice that `\"chat_history\"` aligns with the MessagesPlaceholder name.<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"18\"><span class=\"hljs-attr\">memory<\/span> = ConversationBufferMemory(memory_key=<span class=\"hljs-string\">\"chat_history\"<\/span>, return_messages=<span class=\"hljs-literal\">True<\/span>)<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"19\"><span class=\"hljs-attr\">conversation<\/span> = LLMChain(<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"20\">    <span class=\"hljs-attr\">llm<\/span>=llm,<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"21\">    <span class=\"hljs-attr\">prompt<\/span>=prompt,<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"22\">    <span class=\"hljs-attr\">verbose<\/span>=<span class=\"hljs-literal\">True<\/span>,<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"23\">    <span class=\"hljs-attr\">memory<\/span>=memory)<\/span>\n<\/code><\/pre>\n<p><strong>05<\/strong> <strong>Agents<\/strong><\/p>\n<p>Agents\u5728\u6838\u5fc3\u4f5c\u7528\u5c31\u662f\uff1a\u4f7f\u7528LLM\u6765\u9009\u62e9\u4e00\u7cfb\u5217\u8981\u6267\u884c\u7684\u64cd\u4f5c\u3002\u5728\u4e00\u4e2aChain\u4e2d\uff0c\u5b83\u8981\u6267\u884c\u7684\u64cd\u4f5c\u4ee5\u53ca\u6b21\u5e8f\u662f\u4ee3\u7801\u4e2d\u4e8b\u5148\u786e\u5b9a\u597d\u4e86\u7684\uff1b\u6709\u4e86Agents\uff0cLLM\u53ef\u4ee5\u52a8\u6001\u9009\u62e9\u8981\u6267\u884c\u7684\u64cd\u4f5c\u548c\u6b21\u5e8f\u3002<\/p>\n<p>Agent\u672c\u8d28\u5c31\u662f\u4e00\u4e2a\u51b3\u5b9a\u4e0b\u4e00\u6b65\u64cd\u4f5c\u7684\u7c7b\uff0c\u7531\u4e00\u4e2a\u8bed\u8a00\u6a21\u578b\u548c\u4e00\u4e2aprompt\u6765\u9a71\u52a8\u3002prompt\u53ef\u4ee5\u5305\u62ec\u5982\u4e0b\u5185\u5bb9\uff1a<\/p>\n<ul>\n<li>\n<p>agent\u7684\u7279\u6027<\/p>\n<\/li>\n<li>\n<p>agent\u7684\u80cc\u666f\u3001\u4e0a\u4e0b\u6587<\/p>\n<\/li>\n<li>\n<p>\u8f85\u52a9\u63a8\u7406\u6267\u884c\u4e0b\u4e00\u6b65\u7684prompt\u7b56\u7565<\/p>\n<\/li>\n<\/ul>\n<p>Tools\u662fagents\u8c03\u7528\u7684\u51fd\u6570\uff0c\u5b83\u7684\u4f5c\u7528\u4e3b\u8981\u662f\uff1a<\/p>\n<ul>\n<li>\n<p>\u544a\u8bc9agent\u53ef\u4ee5\u8bbf\u95ee\u54ea\u4e9b\u6b63\u786e\u7684\u5de5\u5177<\/p>\n<\/li>\n<li>\n<p>\u544a\u8bc9agent\u6b63\u786e\u7684\u4f7f\u7528\u5de5\u5177<\/p>\n<\/li>\n<\/ul>\n<p>LangChain\u63d0\u4f9b\u4e86\u5f88\u591a\u5de5\u5177\uff0c\u540c\u65f6\u6211\u4eec\u4e5f\u53ef\u4ee5\u5b9a\u4e49\u6211\u4eec\u81ea\u5df1\u7684\u5de5\u5177\u3002<\/p>\n<ul>\n<li>\n<p>Defining Custom Tools<\/p>\n<\/li>\n<li>\n<p>Human-in-the-loop Tool Validation<\/p>\n<\/li>\n<li>\n<p>Multi-Input Tools<\/p>\n<\/li>\n<li>\n<p>Tool Input Schema<\/p>\n<\/li>\n<li>\n<p>Tools as OpenAI Functions<\/p>\n<\/li>\n<\/ul>\n<p>\u4e0b\u9762\u6211\u4eec\u770b\u4e00\u4e2aAgent\u7684\u4f8b\u5b50\uff1a<\/p>\n<p>1. \u9996\u5148\u5b9a\u4e49\u4e00\u4e2a\u8bed\u8a00\u6a21\u578b\u6765\u63a7\u5236agent<\/p>\n<pre><\/div><div class=\"code-block-extension-headerRight\"><span class=\"code-block-extension-lang\">ini<\/span><div class=\"code-block-extension-copyCodeBtn\">\u590d\u5236\u4ee3\u7801<\/div><\/div><\/div><code class=\"hljs language-ini code-block-extension-codeShowNum\" lang=\"ini\"><span class=\"code-block-extension-codeLine\" data-line-num=\"1\">from langchain.chat_models import ChatOpenAI<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"2\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"3\"><span class=\"hljs-attr\">llm<\/span> = ChatOpenAI(temperature=<span class=\"hljs-number\">0<\/span>, openai_api_key=<span class=\"hljs-string\">\"aaa\"<\/span>)<\/span>\n<\/code><\/pre>\n<p>2. \u5b9a\u4e49\u5de5\u5177<\/p>\n<pre><\/div><div class=\"code-block-extension-headerRight\"><span class=\"code-block-extension-lang\">python<\/span><div class=\"code-block-extension-copyCodeBtn\">\u590d\u5236\u4ee3\u7801<\/div><\/div><\/div><code class=\"hljs language-python code-block-extension-codeShowNum\" lang=\"python\"><span class=\"code-block-extension-codeLine\" data-line-num=\"1\"><span class=\"hljs-keyword\">from<\/span> langchain.agents <span class=\"hljs-keyword\">import<\/span> tool\u200b<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"2\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"3\"><span class=\"hljs-meta\">@tool<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"4\"><span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">get_word_length<\/span>(<span class=\"hljs-params\">word: <span class=\"hljs-built_in\">str<\/span><\/span>) -&gt; <span class=\"hljs-built_in\">int<\/span>:<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"5\">    <span class=\"hljs-string\">\"\"\"Returns the length of a word.\"\"\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"6\">    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-built_in\">len<\/span>(word)\u200b<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"7\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"8\">tools = [get_word_length]<\/span>\n<\/code><\/pre>\n<p>3. \u521b\u5efaprompt<\/p>\n<pre><\/div><div class=\"code-block-extension-headerRight\"><span class=\"code-block-extension-lang\">ini<\/span><div class=\"code-block-extension-copyCodeBtn\">\u590d\u5236\u4ee3\u7801<\/div><\/div><\/div><code class=\"hljs language-ini code-block-extension-codeShowNum\" lang=\"ini\"><span class=\"code-block-extension-codeLine\" data-line-num=\"1\">from langchain.schema import SystemMessage<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"2\">from langchain.agents import OpenAIFunctionsAgent<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"3\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"4\"><span class=\"hljs-attr\">system_message<\/span> = SystemMessage(content=<span class=\"hljs-string\">\"You are very powerful assistant, but bad at calculating lengths of words.\"<\/span>)<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"5\"><span class=\"hljs-attr\">prompt<\/span> = OpenAIFunctionsAgent.create_prompt(system_message=system_message)<\/span>\n<\/code><\/pre>\n<p>4. \u521b\u5efaagent<\/p>\n<pre><\/div><div class=\"code-block-extension-headerRight\"><span class=\"code-block-extension-lang\">ini<\/span><div class=\"code-block-extension-copyCodeBtn\">\u590d\u5236\u4ee3\u7801<\/div><\/div><\/div><code class=\"hljs language-ini code-block-extension-codeShowNum\" lang=\"ini\"><span class=\"code-block-extension-codeLine\" data-line-num=\"1\"><span class=\"hljs-attr\">agent<\/span> = OpenAIFunctionsAgent(llm=llm, tools=tools, prompt=prompt)<\/span>\n<\/code><\/pre>\n<p>5. \u521b\u5efaAgentExecutor\u5e76\u6267\u884c<\/p>\n<pre><\/div><div class=\"code-block-extension-headerRight\"><span class=\"code-block-extension-lang\">python<\/span><div class=\"code-block-extension-copyCodeBtn\">\u590d\u5236\u4ee3\u7801<\/div><\/div><\/div><code class=\"hljs language-python code-block-extension-codeShowNum\" lang=\"python\"><span class=\"code-block-extension-codeLine\" data-line-num=\"1\"><span class=\"hljs-keyword\">from<\/span> langchain.agents <span class=\"hljs-keyword\">import<\/span> AgentExecutor<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"2\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"3\">agent_executor = AgentExecutor(agent=agent, tools=tools, verbose=<span class=\"hljs-literal\">True<\/span>)\u200b<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"4\">agent_executor.run(<span class=\"hljs-string\">\"how many letters in the word educa?\"<\/span>)<\/span>\n<\/code><\/pre>\n<p>\u81f3\u6b64\u7b2c\u4e00\u4e2aagent\u5c31\u5b8c\u6210\u4e86\uff0c\u4f60\u53ef\u4ee5\u5728\u672c\u5730\u6267\u884c\u67e5\u770b\u6548\u679c\u5566\uff01<\/p>\n<p><strong>06 Callbacks<\/strong><\/p>\n<p>LangChain\u63d0\u4f9b\u4e86\u4e00\u4e2acallbacks\u7cfb\u7edf\uff0c\u8fd9\u6837\u4f60\u5c31\u53ef\u4ee5\u5728LLM\u5e94\u7528\u7684\u4e0d\u540c\u9636\u6bb5\u5b9e\u73b0\u4f60\u7684\u94a9\u5b50\u51fd\u6570\uff0c\u6bd4\u5982\u8bf4\u65e5\u5fd7\u3001\u76d1\u63a7\u3001\u6d41\u5904\u7406\u7b49\u5176\u5b83\u4efb\u52a1\u3002<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7callcacks\u7684\u53c2\u6570\u6765\u8ba2\u9605\u4e8b\u4ef6\uff0c\u8fd9\u4e2a\u53c2\u6570\u5c31\u662fhandlers\u5bf9\u8c61\u3002CallbackHandlers\u662f\u5b9e\u73b0CallbackHandler\u63a5\u53e3\u7684\u5bf9\u8c61\uff0c\u63a5\u53e3\u4e2d\u5b9a\u4e49\u4e86\u5f88\u591a\u4e0d\u540c\u51fd\u6570\u6765\u76d1\u63a7\u4e0d\u540c\u4e8b\u4ef6\uff0c\u5982\u679c\u4f60\u9700\u8981\u8ba2\u9605\u67d0\u4e2a\u4e8b\u4ef6\uff0c\u4f60\u53ea\u9700\u8981\u5b9e\u73b0\u63a5\u53e3\u4e2d\u5bf9\u5e94\u7684\u51fd\u6570\u5373\u53ef\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u6700\u57fa\u672c\u7684CallbackHander\uff1a<\/p>\n<pre><\/div><div class=\"code-block-extension-headerRight\"><span class=\"code-block-extension-lang\">python<\/span><div class=\"code-block-extension-copyCodeBtn\">\u590d\u5236\u4ee3\u7801<\/div><\/div><\/div><code class=\"hljs language-python code-block-extension-codeShowNum\" lang=\"python\"><span class=\"code-block-extension-codeLine\" data-line-num=\"1\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">BaseCallbackHandler<\/span>:<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"2\">    <span class=\"hljs-string\">\"\"\"Base callback handler that can be used to handle callbacks from langchain.\"\"\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"3\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"4\">    <span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">on_llm_start<\/span>(<span class=\"hljs-params\"><\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"5\">        self, serialized: <span class=\"hljs-type\">Dict<\/span>[<span class=\"hljs-built_in\">str<\/span>, <span class=\"hljs-type\">Any<\/span>], prompts: <span class=\"hljs-type\">List<\/span>[<span class=\"hljs-built_in\">str<\/span>], **kwargs: <span class=\"hljs-type\">Any<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"6\">    ) -&gt; <span class=\"hljs-type\">Any<\/span>:<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"7\">        <span class=\"hljs-string\">\"\"\"Run when LLM starts running.\"\"\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"8\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"9\">    <span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">on_chat_model_start<\/span>(<span class=\"hljs-params\"><\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"10\">        self, serialized: <span class=\"hljs-type\">Dict<\/span>[<span class=\"hljs-built_in\">str<\/span>, <span class=\"hljs-type\">Any<\/span>], messages: <span class=\"hljs-type\">List<\/span>[<span class=\"hljs-type\">List<\/span>[BaseMessage]], **kwargs: <span class=\"hljs-type\">Any<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"11\">    ) -&gt; <span class=\"hljs-type\">Any<\/span>:<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"12\">        <span class=\"hljs-string\">\"\"\"Run when Chat Model starts running.\"\"\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"13\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"14\">    <span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">on_llm_new_token<\/span>(<span class=\"hljs-params\">self, token: <span class=\"hljs-built_in\">str<\/span>, **kwargs: <span class=\"hljs-type\">Any<\/span><\/span>) -&gt; <span class=\"hljs-type\">Any<\/span>:<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"15\">        <span class=\"hljs-string\">\"\"\"Run on new LLM token. Only available when streaming is enabled.\"\"\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"16\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"17\">    <span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">on_llm_end<\/span>(<span class=\"hljs-params\">self, response: LLMResult, **kwargs: <span class=\"hljs-type\">Any<\/span><\/span>) -&gt; <span class=\"hljs-type\">Any<\/span>:<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"18\">        <span class=\"hljs-string\">\"\"\"Run when LLM ends running.\"\"\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"19\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"20\">    <span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">on_llm_error<\/span>(<span class=\"hljs-params\"><\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"21\">        self, error: <span class=\"hljs-type\">Union<\/span>[Exception, KeyboardInterrupt], **kwargs: <span class=\"hljs-type\">Any<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"22\">    ) -&gt; <span class=\"hljs-type\">Any<\/span>:<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"23\">        <span class=\"hljs-string\">\"\"\"Run when LLM errors.\"\"\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"24\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"25\">    <span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">on_chain_start<\/span>(<span class=\"hljs-params\"><\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"26\">        self, serialized: <span class=\"hljs-type\">Dict<\/span>[<span class=\"hljs-built_in\">str<\/span>, <span class=\"hljs-type\">Any<\/span>], inputs: <span class=\"hljs-type\">Dict<\/span>[<span class=\"hljs-built_in\">str<\/span>, <span class=\"hljs-type\">Any<\/span>], **kwargs: <span class=\"hljs-type\">Any<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"27\">    ) -&gt; <span class=\"hljs-type\">Any<\/span>:<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"28\">        <span class=\"hljs-string\">\"\"\"Run when chain starts running.\"\"\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"29\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"30\">    <span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">on_chain_end<\/span>(<span class=\"hljs-params\">self, outputs: <span class=\"hljs-type\">Dict<\/span>[<span class=\"hljs-built_in\">str<\/span>, <span class=\"hljs-type\">Any<\/span>], **kwargs: <span class=\"hljs-type\">Any<\/span><\/span>) -&gt; <span class=\"hljs-type\">Any<\/span>:<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"31\">        <span class=\"hljs-string\">\"\"\"Run when chain ends running.\"\"\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"32\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"33\">    <span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">on_chain_error<\/span>(<span class=\"hljs-params\"><\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"34\">        self, error: <span class=\"hljs-type\">Union<\/span>[Exception, KeyboardInterrupt], **kwargs: <span class=\"hljs-type\">Any<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"35\">    ) -&gt; <span class=\"hljs-type\">Any<\/span>:<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"36\">        <span class=\"hljs-string\">\"\"\"Run when chain errors.\"\"\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"37\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"38\">    <span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">on_tool_start<\/span>(<span class=\"hljs-params\"><\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"39\">        self, serialized: <span class=\"hljs-type\">Dict<\/span>[<span class=\"hljs-built_in\">str<\/span>, <span class=\"hljs-type\">Any<\/span>], input_str: <span class=\"hljs-built_in\">str<\/span>, **kwargs: <span class=\"hljs-type\">Any<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"40\">    ) -&gt; <span class=\"hljs-type\">Any<\/span>:<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"41\">        <span class=\"hljs-string\">\"\"\"Run when tool starts running.\"\"\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"42\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"43\">    <span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">on_tool_end<\/span>(<span class=\"hljs-params\">self, output: <span class=\"hljs-built_in\">str<\/span>, **kwargs: <span class=\"hljs-type\">Any<\/span><\/span>) -&gt; <span class=\"hljs-type\">Any<\/span>:<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"44\">        <span class=\"hljs-string\">\"\"\"Run when tool ends running.\"\"\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"45\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"46\">    <span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">on_tool_error<\/span>(<span class=\"hljs-params\"><\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"47\">        self, error: <span class=\"hljs-type\">Union<\/span>[Exception, KeyboardInterrupt], **kwargs: <span class=\"hljs-type\">Any<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"48\">    ) -&gt; <span class=\"hljs-type\">Any<\/span>:<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"49\">        <span class=\"hljs-string\">\"\"\"Run when tool errors.\"\"\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"50\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"51\">    <span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">on_text<\/span>(<span class=\"hljs-params\">self, text: <span class=\"hljs-built_in\">str<\/span>, **kwargs: <span class=\"hljs-type\">Any<\/span><\/span>) -&gt; <span class=\"hljs-type\">Any<\/span>:<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"52\">        <span class=\"hljs-string\">\"\"\"Run on arbitrary text.\"\"\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"53\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"54\">    <span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">on_agent_action<\/span>(<span class=\"hljs-params\">self, action: AgentAction, **kwargs: <span class=\"hljs-type\">Any<\/span><\/span>) -&gt; <span class=\"hljs-type\">Any<\/span>:<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"55\">        <span class=\"hljs-string\">\"\"\"Run on agent action.\"\"\"<\/span><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"56\"><\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"57\">    <span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">on_agent_finish<\/span>(<span class=\"hljs-params\">self, finish: AgentFinish, **kwargs: <span class=\"hljs-type\">Any<\/span><\/span>) -&gt; <span class=\"hljs-type\">Any<\/span>:<\/span>\n<span class=\"code-block-extension-codeLine\" data-line-num=\"58\">        <span class=\"hljs-string\">\"\"\"Run on agent end.\"\"\"<\/span><\/span>\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u5c31\u662fMemory\u3001Agents\u3001Callbacks\u8fd9\u4e09\u4e2a\u6a21\u5757\u7684\u4ecb\u7ecd\uff0c\u518d\u52a0\u4e0a<a href=\"https:\/\/juejin.cn\/post\/7270906612339015741\" target=\"_blank\" title=\"https:\/\/juejin.cn\/post\/7270906612339015741\" rel=\"noopener\">\u3010LangChain\u7cfb\u5217 2\u3011LangChain\u6838\u5fc3\u6a21\u5757\u7b80\u4ecb(\u4e00)<\/a>\uff0cLangChain\u7684\u6838\u5fc3\u6a21\u5757\u4ecb\u7ecd\u5c31\u5b8c\u6210\u4e86\uff0c\u540e\u9762\u6211\u5c06\u8be6\u7ec6\u5730\u4ecb\u7ecd\u5404\u4e2a\u6a21\u5757\u7684\u4f7f\u7528\u4e0e\u5b9e\u8df5\u3002<\/p>","protected":false},"excerpt":{"rendered":"<p>\u539f\u6587\u94fe\u63a5\uff1aLangChain\u6838\u5fc3\u6a21\u5757\u7b80\u4ecb(\u4e8c) Memory Agents Callbacks<\/p>\n","protected":false},"author":1,"featured_media":5562,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"rank_math_title":"","rank_math_description":"","rank_math_focus_keyword":"","views":"41","footnotes":""},"categories":[3],"tags":[127,128,129,136,126],"collection":[],"class_list":["post-1316","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fenlei2","tag-ai","tag-128","tag-129","tag-136","tag-gpt"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/posts\/1316","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/comments?post=1316"}],"version-history":[{"count":0,"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/posts\/1316\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/media\/5562"}],"wp:attachment":[{"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/media?parent=1316"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/categories?post=1316"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/tags?post=1316"},{"taxonomy":"collection","embeddable":true,"href":"https:\/\/www.nicekj.com\/nicekj2024\/wp\/v2\/collection?post=1316"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}