Langchain cookbook Note: This cookbook will not cover all aspects of LangChain. Contribute to Chainlit/cookbook development by creating an account on GitHub. Setup . **Understand the core concepts**: LangChain revolves around a few core concepts, like Agents, Chains, and Tools. from langchain_community. Learn how to build various applications with LangChain, a library for building language-based AI applications. Adding memory . 2. runnables import RunnableLambda, RunnablePassthrough from langchain_openai import ChatOpenAI langchain-core：基础抽象和 LangChain 表达式语言。 langchain-community：第三方集成。 langchain：构成应用程序认知架构的链、代理和检索策略。 开始使用 . The RunnableParallel (also known as a RunnableMap) primitive is an object whose values are runnables (or things that can be coerced to runnables, like functions). Jun 14, 2024 · langchain-core：基本抽象和 LangChain 表达式语言。 langchain-community：第三方集成。 合作伙伴包（例如 langchain-openai，langchain-anthropic 等）：某些集成已进一步拆分为仅依赖于 langchain-core 的轻量级包。 langchain：构成应用程序认知架构的链条、代理和检索策略。 Jun 29, 2024 · Inspiration from LangChain Cookbook. Example code for building applications with LangChain, with an emphasis on more applied and end-to-end examples than contained in the main documentation. runnables import RunnableLambda, RunnablePassthrough from langchain_openai import ChatOpenAI, OpenAIEmbeddings Automatic Embeddings with TEI through Inference Endpoints Migrating from OpenAI to Open LLMs Using TGI's Messages API Advanced RAG on HuggingFace documentation using LangChain Suggestions for Data Annotation with SetFit in Zero-shot Text Classification Fine-tuning a Code LLM on Custom Code on a single GPU Prompt tuning with PEFT RAG with Hugging Face and Milvus RAG Evaluation Using LLM-as-a 🦜🔗 Build context-aware reasoning applications. Note, the default value is not filled in automatically if the model doesn't generate it, it is only used in defining the schema that is passed to the model. Chapter 02 Prompt Templates and the Art of Prompts. utilities import PythonREPL from langchain_openai import ChatOpenAI An Introduction to LangChain. 代理人. 🦜🔗 Build context-aware reasoning applications. Share your own examples and guides. For the current stable version, see this version ( Latest ). It provides a diverse collection of example projects , each residing in its own folder, showcasing the integration of various tools such as OpenAI, Anthropiс, LangChain, LlamaIndex This is documentation for LangChain v0. 点击进入 📚 Langchain 中文文档 JS/TS 版本. Almost all other chains you build will use this building block. llms import OpenAI from langchain. memory import ConversationBufferMemory llm = OpenAI (temperature = 0) # Notice that "chat_history" is present in the prompt template template = """You are a nice chatbot having a conversation with a human 🦜🔗 Build context-aware reasoning applications. This template performs RAG on semi-structured data, such as a PDF with text and tables. A template repository for learning LangChain, a library for building AI applications with natural language. We’re releasing three new cookbooks that showcase the multi-vector retriever for RAG on documents that contain a mixture of content types. The LangSmith Cookbook is a practical guide to maximizing LangSmith a comprehensive tool designed to debug, evaluate, test, and improve LLM applications continuously. It enables applications that: Are context-aware: connect a language model to sources of context (prompt instructions, few shot examples, content to ground its response in, etc. First install typeorm: It seamlessly integrates with LangChain and LangGraph, and you can use it to inspect and debug individual steps of your chains and agents as you build. langchain-core：基础抽象和 LangChain 表达式语言。 langchain-community：第三方集成。 langchain：构成应用程序认知架构的链、代理和检索策略。 开始使用 . The Cookbook repository serves as a valuable resource and starting point for developers looking to explore the capabilities of Chainlit in creating LLM apps. This shows how to add memory to an arbitrary chain. ; Neo4j allows you to represent and store data in nodes and edges, making it ideal for handling connected data and relationships. clap and subscribe if you like this article series. LangChain中文站，助力大语言模型LLM应用开发、chatGPT应用开发。 One of the most common use cases for LangChain and LLMs is summarization. Financial CSV Agent with Langchain. This is documentation for LangChain v0. If you're looking to get started with chat models, vector stores, or other LangChain components from a specific provider, check out our supported integrations. In this notebook we'll take a look at a few common types of sequences to create. In this paper, we introduce generative agents from langchain. Agents. Contribute to langchain-ai/langchain development by creating an account on GitHub. Set the OPENAI_API_KEY environment variable to access the OpenAI models. 본 튜토리얼을 통해 LangChain을 더 LangChain cookbook. from langchain_experimental. . On this page. rag-semi-structured. Chat models and prompts: Build a simple LLM application with prompt templates and chat models. runnables import RunnableLambda, RunnablePassthrough from langchain_openai import ChatOpenAI Feb 27, 2024 · Key Links * LangGraph cookbook * Video Motivation Code generation and analysis are two of most important applications of LLMs, as shown by the ubiquity of products like GitHub co-pilot and popularity of projects like GPT-engineer. Prompt engineering how-to guides. LangChain can optimize the streaming of the output to minimize the time-to-first-token(time elapsed until the first chunk of output from a chat model or llm comes out). LangChain 的核心，LangChain 是围绕 LLMs 构建的框架。我们可以将其用于聊天机器人，Generative Question-Answering (GQA)，摘要等等。 该库的核心思想是我们可以将不同的组件 “ 链 ” 在一起，以创建更高级的 LLMs 用例。链可能由来自几个模块的多个组件组成： 🦜🔗 Build context-aware reasoning applications. 24 and @langchain/langgraph >= 0. The output of the previous runnable’s . messages import (AIMessage, HumanMessage, SystemMessage, ToolMessage, trim_messages,) from langchain_core. 使用工具 from langchain_core. Whereas in the latter it is common to generate text that can be searched against a vector database, the approach for structured data is often for the LLM to write and execute queries in a DSL, such as SQL. Tools are also runnables, and can therefore be used within a chain: tip. 34. 1, Cookbook. You switched accounts on another tab or window. The integration also supports Langchain JS. pipe both accept runnable-like objects, including single-argument functions, we can add in conversation history via a formatting function. Returning sources 🦜🔗 Build context-aware reasoning applications. cookbook. storage import InMemoryStore from langchain_chroma import Chroma from langchain_openai import OpenAIEmbeddings # The vectorstore to use to index the child chunks vectorstore = Chroma (collection_name = "big2small", embedding_function 🦜🔗 Build context-aware reasoning applications. from and runnable. You can pass a Runnable into an agent. invoke in the generate step, requires @langchain/core >= 0. See this cookbook as a reference. schema import (HumanMessage, SystemMessage) from util import setEnv setEnv() # instantiate the LLM model llm = OpenAI() # now call the LLM from code text = 'What is the scientific name of vitamin B4' print(llm(text 🦜🔗 Build context-aware reasoning applications. It is built on the Runnable protocol. LangChain: Cookbook: generative_agents_interactive_simulacra_of_human_behavior, multiagent_bidding; Abstract: Believable proxies of human behavior can empower interactive applications ranging from immersive environments to rehearsal spaces for interpersonal communication to prototyping tools. Chapter 03 Building Composable Pipelines with Chains. Follow the integration guide to add this integration to your Langchain project. How to: return structured data from an LLM; How to: use a chat model to call tools; How to: stream runnables; How to: debug your LLM apps; LangChain Expression Language (LCEL) LangChain Expression Language is a way to create arbitrary custom chains. utils import count_tokens_approximately messages = [SystemMessage ("you're a good assistant, you always respond with a joke. Mar 12, 2024 · 所谓Cookbook，那当然是不会厨艺的人每次做菜之前的必读物，我觉得这个官网的Cookbook不仅仅是关于如何使用LCEL来做大语言模型的应用了，就是给大家枚举了一下Langchain本身该怎么的几大使用方法。 使用 LangChain 开发应用程序。基于吴恩达老师《LangChain for LLM Application Development》课程打造，对 LangChain 展开深入介绍，帮助学习者了解如何使用 LangChain，并基于 LangChain 开发完整的、具备强大能力的应用程序。 使用 LangChain 访问个人数据。 You signed in with another tab or window. It covers the basics of LangChain components, such as text, chat, documents, and models, and shows how to customize and integrate them. prompts import ChatPromptTemplate from langchain_core. This means you can't ask follow up questions easily. 使用 LangChain 开发应用程序。基于吴恩达老师《LangChain for LLM Application Development》课程打造，对 LangChain 展开深入介绍，帮助学习者了解如何使用 LangChain，并基于 LangChain 开发完整的、具备强大能力的应用程序。 使用 LangChain 访问个人数据。 We would like to show you a description here but the site won’t allow us. You signed out in another tab or window. %pip install --upgrade --quiet langchain langchain-openai. from langchain import hub from langchain_community. messages. 点击进入 📃 Langchain COOKBOOK 教程 cookbook. Contribute to Cdaprod/langchain-cookbook development by creating an account on GitHub. Other benefits include: Seamless LangSmith tracing As your chains get more and more complex, it becomes increasingly important to understand what exactly is happening at every step. utils. 提示 + LLM. Right now, you can use the memory classes but need to hook them up manually. Debug poor-performing LLM app runs 🦜🔗 Build context-aware reasoning applications. Hyde RAG: LangChain, Weaviate, Athina AI: Creates hypothetical document embeddings to find relevant Enabling a LLM system to query structured data can be qualitatively different from unstructured text data. LCEL was designed from day 1 to support putting prototypes in production, with no code changes, from the simplest “prompt + LLM” chain to the most complex chains (we’ve seen folks successfully run LCEL chains with 100s of steps in production). 我们独立构建我们的索引，与LangChain无关。因为这是一个直接的过程，并且使用Pinecone客户端直接完成速度更快。 但是，我们要回到LangChain，所以我们应该通过LangChain库重新连接到我们的索引。 🦜🔗 Build context-aware reasoning applications. Table of Contents. LangChain Expression Language Learn how to build various applications with LangChain, a library for building language-based AI applications. Cookbook. Sep 30, 2023 · This notebook shows how to implement a question answering system with LangChain, Deep Lake as a vector store and OpenAI embeddings. You'll need an OpenAI api key to follow this tutorial. A PromptTemplate -> LLM is a core chain that is used in most other larger chains/systems. 1, which is no longer actively maintained. LangChain 공식 Document, Cookbook, 그 밖의 실용 예제를 바탕으로 작성한 한국어 튜토리얼입니다. 代理人 from langchain. Enabling a LLM system to query structured data can be qualitatively different from unstructured text data. An overview of the core components of LangChain. It includes tutorials, projects, videos, and links to resources on prompt engineering, summarization, question and answering, extraction, evaluation, and more. While our standard documentation covers the basics, this repository delves into common patterns and some real-world use-cases, empowering you to optimize your LLM applications further. multi_vector import MultiVectorRetriever, SearchType from langchain. These are applications that can answer questions about specific source information. LangChain is a framework for developing applications powered by language models. document_loaders import WebBaseLoader from langchain_core. Streaming tokens with the current implementation, using . mdx 39-40 Retrieval Systems LangChain provides a comprehensive retrieval system for implementing Retrieval Augmented Generation (RAG) patterns: At its core, LangChain is a cookbook that provides a step-by-step guide to the seven essential concepts that form the backbone of conversational AI. 3. ipynb 31-33 docs/docs/introduction. PromptTemplate + LLM . The experimental masking parser and transformer is an extendable module for masking and rehydrating strings. invoke() call is passed as input to the next runnable. Mar 12, 2024 · 所谓Cookbook，那当然是不会厨艺的人每次做菜之前的必读物，我觉得这个官网的Cookbook不仅仅是关于如何使用LCEL来做大语言模型的应用了，就是给大家枚举了一下Langchain本身该怎么的几大使用方法。 Feb 14, 2025 · 19-Cookbook 01-SQL 02-RecommendationSystem 03-GraphDB 04-GraphRAG 05-AIMemoryManagementSystem 06-Multimodal 07-Agent 08-Serving 08-SyntheticDataset 09-Monitoring Previous Reflection in LangGraph Next 01-SQL # pip install chromadb langchain langchain-openai langchain-chroma import chromadb from chromadb. Exploring how LangChain supports modularity and composability with chains. We'll need the Chinook sample DB for this example. prompts import ChatPromptTemplate from LangChain, Pinecone, Athina AI: Combines retrieved data with LLMs for simple and effective responses. LangChain CookBook Part 1: 7 Core Concepts - Code, Video; LangChain CookBook Part 2: 9 Use Cases - Code, Video; Explore the projects below and jump into the deep dives; Prompt Engineering (my favorite resources): Prompt Engineering Overview by Elvis Saravia; ChatGPT Prompt Engineering for Developers - Prompt engineering basics straight from OpenAI Conversational Retrieval Chain . langchain-core：基本抽象和 LangChain 表达式语言。 langchain-community：第三方集成。 合作伙伴包（例如 langchain-openai，langchain-anthropic 等）：某些集成已进一步拆分为仅依赖于 langchain-core 的轻量级包。 langchain：构成应用程序认知架构的链条、代理和检索策略。. We can replicate our SQLDatabaseChain with Runnables. Feb 19, 2025 · Setup Jupyter Notebook . prompts import PromptTemplate from langchain. Environment Setup . embedding_functions import create_langchain_embedding from langchain_openai import OpenAIEmbeddings langchain_embeddings = OpenAIEmbeddings (model = "text-embedding-3-large", api_key = os. See details here . Familiarize yourself with LangChain's open-source components by building simple applications. graph import START, StateGraph from typing_extensions import List, TypedDict # Load and chunk contents of the blog loader Agents. If you have cool examples showcasing Mistral models, feel free to share them by submitting a PR to this repo. We will take the following steps to achieve this: Load a Deep Lake text dataset; Initialize a Deep Lake vector store with LangChain; Add text to the vector store; Run queries on the database; Done! Cookbook: Langchain Integration. These applications use a technique known as Retrieval Augmented Generation, or RAG. You can summarize any piece of text, but use cases span from summarizing calls, articles, books, academic papers, legal documents, user history, a table, or financial documents. \n\n2. By understanding the core components and leveraging the advanced features, you can create powerful applications tailored to your specific needs. 点击进入 📃 Langchain COOKBOOK 教程 The | symbol is similar to a unix pipe operator, which chains together the different components, feeding the output from one component as input into the next component. One of the primary use cases for this module is to redact PII (Personal Identifiable Information) from a string before making a call to an llm. Organize and manage prompts in LangSmith to streamline your LLM development workflow. However, Eden’s project extends beyond the cookbook by focusing on maintainable and testable code structures. You can peruse LangSmith how-to guides here, but we'll highlight a few sections that are particularly relevant to LangChain below: Evaluation LangChain中文网 500页超详细中文文档教程，助力LLM/chatGPT应用开发 🦜🔗 Build context-aware reasoning applications. Learn how to use LangChain, a framework for developing applications powered by language models, with this cookbook. This repository is your While the LangChain framework can be used standalone, it also integrates seamlessly with any LangChain product, giving developers a full suite of tools when building LLM applications. Neo4j is an open-source database management system that specializes in graph database technology. Querying a SQL DB. The notebook demonstrates how to setup a Langchain Cohere ReAct Agent to answer questions over the income statement and balance sheet from Apple's SEC10K 2020 form. Running the Code 🦜🔗 Build context-aware reasoning applications. documents import Document from langchain_text_splitters import RecursiveCharacterTextSplitter from langgraph. Large Language Models（LLMs）于 2020 年 OpenAI 的 GPT-3 发布时登上世界舞台。 LangChain中文站，助力大语言模型LLM应用开发、chatGPT应用开发。 Skip to main content LangChain 🦜️🔗 中文网，跟着LangChain一起学LLM/GPT开发 Concepts Python Docs JS/TS Docs Jul 1, 2024 · By Author Sources. You signed in with another tab or window. from langchain_openai import OpenAI from langchain_core. Browse a collection of snippets, advanced techniques and walkthroughs. While the standard documentation covers the fundamentals, this repository provides real-world scenarios, common patterns, and practical recipes for implementing LangSmith in your cookbook. Prompt hub . ) Jupyter Notebook. One of the most foundational Expression Language compositions is taking: PromptTemplate / ChatPromptTemplate-> LLM / ChatModel-> OutputParser. html) into a format suitable by LangChain. 点击进入 🚀 Langchain 中文文档 PYTHON 版本. Introduction. Overview and tutorial of the LangChain Library. prompts import ChatPromptTemplate from langchain_openai import ChatOpenAI prompt1 = ChatPromptTemplate. May 8, 2025 · Vertex AI Cookbook; All Generative AI on Vertex AI samples; AI and ML Application development Application hosting Compute Data analytics and pipelines Databases Distributed, hybrid, and multicloud Generative AI Industry solutions Networking Observability and monitoring Security Storage The Mistral Cookbook features examples contributed by Mistralers and our community, as well as our partners. runnables import RunnablePassthrough from langchain_openai import ChatOpenAI, OpenAIEmbeddings vectorstore = FAISS. retrievers. Reload to refresh your session. chat_models import ChatOpenAI from langchain. Jupyter notebooks are perfect interactive environments for learning how to work with LLM systems because oftentimes things can go wrong (unexpected output, API down, etc), and observing these cases is a great way to better understand building with LLMs. LangChain Cookbook; Same Witteveen Advanced Rag; I highly recommend watching a few videos from Sam Witteveen. Open-source examples and guides for building with the OpenAI API. from_template ("what is the city {person} is from?") prompt2 = ChatPromptTemplate. Hybrid RAG: LangChain, Chromadb, Athina AI: Combines vector search and traditional methods like BM25 for better information retrieval. Step-by-step guides that cover key tasks and operations for doing prompt engineering LangSmith. For more detailed examples and use cases, refer to the LangChain Cookbook Part 2, which provides further insights into practical implementations. This is great - we have an agent! However, this agent is stateless - it doesn't remember anything about previous interactions. LangChain . Chainlit's cookbook repo. Chapter 04 Conversational Memory cookbook. We can optionally use a special Annotated syntax supported by LangChain that allows you to specify the default value and description of a field. Welcome to the LangSmith Cookbook — your practical guide to mastering LangSmith. Prompt + LLM. 使用工具. from_texts (["harrison worked at kensho 🦜🔗 Build context-aware reasoning applications. environ ["OPENAI_API_KEY"],) ef = create_langchain 🦜🔗 Build context-aware reasoning applications. It runs all of its values in parallel, and each value is called with the initial input to the RunnableParallel. It's contents have been curated to get you to building & impact as quick as possible. Jupyter Notebook (formerly IPython Notebook) is a web-based interactive computational environment for creating notebook documents. Setup % LangChain can optimize the streaming of the output to minimize the time-to-first-token(time elapsed until the first chunk of output from a chat model or llm comes out). LangSmith documentation is hosted on a separate site. For more, please check out LangChain Conceptual Documentation. output_parsers import StrOutputParser from langchain_core. The recent AlphaCodium work showed that code generation can be improved by using a flow paradigm Adding memory. These cookbooks as also present a few ideas for pairing This highlights functionality that is core to using LangChain. Jul 2, 2024 · The LangChain CookBook When I first dipped my toes into LangChain last year, I was pretty lost. from_template ("what country is the city {city} in? respond in {language 第一本 langchain 的中文开发手册. agents. Building an agent from a runnable usually involves a few things: Data processing for the intermediate steps (agent_scratchpad). Masking. Neo4j. One point about LangChain Expression Language is that any two runnables can be “chained” together into sequences. prompts import ChatPromptTemplate Azure Cosmos DB. "), HumanMessage ("i wonder why it's called langchain"), AIMessage **Set up your environment**: Install the necessary Python packages, including the LangChain library itself, as well as any other dependencies your application might require, such as language models or other integrations. Mar 23, 2024 · 本文的例子主要来自官网给出的Cookbook（Cookbook | 列️ Langchain）的示例。所谓Cookbook，那当然是不会厨艺的人每次做菜之前的必读物，我觉得这个官网的Cookbook不仅仅是关于如何使用LCEL来做大语言模型的应用了，就是给大家枚举了一下Langchain本身该怎么的几大使用 Jul 19, 2023 · With this we come to end of LangChain CookBook series, Follow my pervious articles on LangChain to gain quick knowledge and for more details and in deep knowledge please check out LangChain documentation. LangChain Expression Language (LCEL) LangChain Expression Language, or LCEL, is a declarative way to easily compose chains together. Interactive tutorial 介绍 （ Introduction ） 📄️ LangChain：介绍与入门. To improve your LLM application development, pair LangChain with: LangSmith - Helpful for agent evals and observability. May 2, 2023 · This notebook takes you through how to use LangChain to augment an OpenAI model with access to external tools. This notebook covers how to load data from a Jupyter notebook (. prompts import (ChatPromptTemplate,) from langchain_experimental. chains import LLMChain from langchain. Explore chat models, semantic search, classification, extraction, orchestration, RAG, question-answering, summarization, and more. The project draws inspiration from the LangChain Cookbook by Lance Martin and Sophia Yang, which provides foundational knowledge on self, corrective, and adaptive RAG. Jun 29, 2023 · # Get the OpenAI llm from langchain from langchain. vectorstores import FAISS from langchain_core. This guide (and most of the other guides in the documentation) uses Jupyter notebooks and assumes the reader is as well. This is a cookbook with examples of the Langfuse Integration for Langchain (Python). Build a chat application that interacts with a SQL database using an open source llm (llama2), specifically demonstrated on an SQLite database containing rosters. output_parsers import XMLAgentOutputParser from langchain_community. Contribute to liteli1987gmail/cookbook_langchain_cn development by creating an account on GitHub. How to chain runnables. This highlights functionality that is core to using LangChain. Structuring the Project Apr 17, 2025 · Sources: cookbook/openai_v1_cookbook. from langchain_core. chat_models import ChatAnthropic One of the most powerful applications enabled by LLMs is sophisticated question-answering (Q&A) chatbots. This notebook shows you how to leverage this integrated vector database to store documents in collections, create indicies and perform vector search queries using approximate nearest neighbor algorithms such as COS (cosine distance), L2 (Euclidean distance), and IP (inner product) to locate documents close to the query vectors. After scouring various blogs and tutorials, I stumbled upon Greg Kamradt’s YouTube video. In particular, you'll be able to create LLM agents that use custom tools to answer user queries. utilities import PythonREPL from langchain_openai import ChatOpenAI template = """编写一些Python代码来解决用户的问题。 🦜🔗 Build context-aware reasoning applications. What is Neo4j?. LangChain矢量存储与查询 . Because RunnableSequence. Using tools. These concepts cover everything from natural language processing to machine learning & beyond, & are designed to provide a solid foundation for anyone looking to get started in the field. In this chain the user input is passed to the prompt template, then the prompt template output is passed to the model, then the model output is passed to the output parser. The art and science behind designing better prompts. 基于语义相似性的路由 from langchain_core. Oct 20, 2023 · Summary Seamless question-answering across diverse data types (images, text, tables) is one of the holy grails of RAG. Jul 7, 2023 · This is purely based on my understanding of the concept and experimentation, before you go through this article it is highly recommended to go through the basics article langchain cookbook-part 01 & langchain cookbook -part 02 Apr 12, 2024 · 文章浏览阅读962次，点赞10次，收藏18次。之前大概有三篇帖子是根据老官网给出的Cookbook和How to两个页面的示例来写的。如今，Cookbook的示例没有写完，网站就改版了。 langchain-core：基础抽象和 LangChain 表达式语言。 langchain-community：第三方集成。 langchain：构成应用程序认知架构的链、代理和检索策略。 开始使用 . Build a RAG Application with Semantic Cache Using MongoDB and LangChain. oksdudfy zkwsb evskz upfkt mqav fafcfr ths vtsoh tdjaljc julxn