AI创想

标题: Introduction to LangChain [打印本页]

---

作者: tongjinqi    时间: 昨天 23:31
标题: Introduction to LangChain
作者：Yongqiang Cheng
   Introduction to LangChain  

1. LangChain2. Introduction3. Documentation4. Quick InstallReferences

1. LangChain

https://www.langchain.com/
LangChain is the platform developers and enterprises choose to build AI apps from prototype to production.

1. chain /tʃeɪn/：n. 链子，链条，锁链，一系列，一连串 (人或事)，约束，连锁商店，连环式 vt. 用锁链拴住 (或束缚、固定)
2. prototype /ˈprəʊtətaɪp/：n. 原型，雏形，最初形态

复制代码

LangChain was launched in October 2022 as an open source project by Harrison Chase, while working at machine learning startup Robust Intelligence.
LangChain 由 Harrison Chase 于 2022 年 10 月作为开源软件项目推出，当时他在机器学习初创公司 Robust Intelligence 工作。
2. Introduction

Python Docs
https://python.langchain.com/docs/introduction/
GitHub
https://github.com/langchain-ai
LangChain is a framework for developing applications powered by large language models (LLMs).
LangChain 是一个开源框架，用于构建基于大型语言模型 (large language models, LLMs) 的应用程序。LangChain 提供了一个标准接口，用于将不同的大型语言模型连接在一起，以及与其他工具和数据源的集成。
LLM 是基于大量数据预先训练的大型深度学习模型，可以生成对用户查询的响应。LLM 擅长在常规上下文下对提示做出响应，但在未接受过训练的特定领域却很吃力。提示是人们寻求 LLM 回复时所用的查询，可以根据特定的结构和上下文对生成模型的输入进行细化的实践。

(, 下载次数: 0)

上传

点击文件名下载附件

LangChain simplifies every stage of the LLM application lifecycle:

Development: Build your applications using LangChain’s open-source building blocks, components, and third-party integrations. Use LangGraph to build stateful agents with first-class streaming and human-in-the-loop support.Productionization: Use LangSmith to inspect, monitor and evaluate your chains, so that you can continuously optimize and deploy with confidence. (使用 LangSmith 检查、监控和评估你的 chains，以便你可以持续优化和自信地部署。)Deployment: Turn your LangGraph applications into production-ready APIs and Assistants with LangGraph Cloud.

借助 LangChain，可以重新将 LLM 用于特定领域的应用程序，而无需重新训练或微调。开发团队可以构建引用专有信息的复杂应用程序，以增强模型响应。例如，您可以使用 LangChain 来构建应用程序，从存储的内部文档中读取数据并将其汇总为对话式响应。您可以创建检索增强生成 (RAG) 工作流程，在提示时向语言模型引入新信息。实施 RAG 等上下文感知工作流程可减少模型幻觉并提高响应精度。

(, 下载次数: 0)

上传

点击文件名下载附件

3. Documentation

Python Docs
https://python.langchain.com/docs/introduction/
LangChain 中文网
https://www.langchain.asia/
LangChain 中文网
https://www.langchain.com.cn/
4. Quick Install

With pip:

1. pip install langchain

复制代码

With conda:

1. conda install langchain -c conda-forge

复制代码

安装 LangChain：

1. (base) yongqiang@yongqiang:~/langchain_work$ pip install langchain
2. Collecting langchain
3.   Downloading langchain-0.3.7-py3-none-any.whl (1.0 MB)
4.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1.0/1.0 MB 1.3 MB/s eta 0:00:00
5. Requirement already satisfied: PyYAML>=5.3 in /home/yongqiang/miniconda3/lib/python3.11/site-packages (from langchain) (6.0.1)
6. Collecting SQLAlchemy<3,>=1.4 (from langchain)
7.   Downloading SQLAlchemy-2.0.36-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (3.2 MB)
8.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 3.2/3.2 MB 1.3 MB/s eta 0:00:00
9. Collecting aiohttp<4.0.0,>=3.8.3 (from langchain)/3.2 MB 1.4 MB/s eta 0:00:01
10.   Downloading aiohttp-3.11.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (1.7 MB)
11.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1.7/1.7 MB 1.1 MB/s eta 0:00:00
12. Collecting langchain-core<0.4.0,>=0.3.15 (from langchain)
13.   Downloading langchain_core-0.3.18-py3-none-any.whl (409 kB)
14.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 409.3/409.3 kB 691.6 kB/s eta 0:00:00
15. Collecting langchain-text-splitters<0.4.0,>=0.3.0 (from langchain)
16.   Downloading langchain_text_splitters-0.3.2-py3-none-any.whl (25 kB)
17. Collecting langsmith<0.2.0,>=0.1.17 (from langchain)
18.   Downloading langsmith-0.1.143-py3-none-any.whl (306 kB)
19.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 307.0/307.0 kB 497.4 kB/s eta 0:00:00
20. Requirement already satisfied: numpy<2,>=1 in /home/yongqiang/miniconda3/lib/python3.11/site-packages (from langchain) (1.24.3)
21. Collecting pydantic<3.0.0,>=2.7.4 (from langchain)
22.   Downloading pydantic-2.9.2-py3-none-any.whl (434 kB)
23.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 434.9/434.9 kB 380.7 kB/s eta 0:00:00
24. Requirement already satisfied: requests<3,>=2 in /home/yongqiang/miniconda3/lib/python3.11/site-packages (from langchain) (2.31.0)
25. Collecting tenacity!=8.4.0,<10,>=8.1.0 (from langchain)
26.   Downloading tenacity-9.0.0-py3-none-any.whl (28 kB)
27. Collecting aiohappyeyeballs>=2.3.0 (from aiohttp<4.0.0,>=3.8.3->langchain)
28.   Downloading aiohappyeyeballs-2.4.3-py3-none-any.whl (14 kB)
29. Collecting aiosignal>=1.1.2 (from aiohttp<4.0.0,>=3.8.3->langchain)
30.   Downloading aiosignal-1.3.1-py3-none-any.whl (7.6 kB)
31. Requirement already satisfied: attrs>=17.3.0 in /home/yongqiang/miniconda3/lib/python3.11/site-packages (from aiohttp<4.0.0,>=3.8.3->langchain) (23.1.0)
32. Collecting frozenlist>=1.1.1 (from aiohttp<4.0.0,>=3.8.3->langchain)
33.   Downloading frozenlist-1.5.0-cp311-cp311-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_17_x86_64.manylinux2014_x86_64.whl (274 kB)
34.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 274.9/274.9 kB 323.9 kB/s eta 0:00:00
35. Collecting multidict<7.0,>=4.5 (from aiohttp<4.0.0,>=3.8.3->langchain)
36.   Downloading multidict-6.1.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (129 kB)
37.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 129.0/129.0 kB 255.3 kB/s eta 0:00:00
38. Collecting propcache>=0.2.0 (from aiohttp<4.0.0,>=3.8.3->langchain)
39.   Downloading propcache-0.2.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (236 kB)
40.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 236.0/236.0 kB 327.2 kB/s eta 0:00:00
41. Collecting yarl<2.0,>=1.17.0 (from aiohttp<4.0.0,>=3.8.3->langchain)
42.   Downloading yarl-1.17.1-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (343 kB)
43.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 343.4/343.4 kB 333.9 kB/s eta 0:00:00
44. Collecting jsonpatch<2.0,>=1.33 (from langchain-core<0.4.0,>=0.3.15->langchain)
45.   Downloading jsonpatch-1.33-py2.py3-none-any.whl (12 kB)
46. Collecting packaging<25,>=23.2 (from langchain-core<0.4.0,>=0.3.15->langchain)
47.   Downloading packaging-24.2-py3-none-any.whl (65 kB)
48.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 65.5/65.5 kB 410.2 kB/s eta 0:00:00
49. Collecting typing-extensions>=4.7 (from langchain-core<0.4.0,>=0.3.15->langchain)
50.   Downloading typing_extensions-4.12.2-py3-none-any.whl (37 kB)
51. Collecting httpx<1,>=0.23.0 (from langsmith<0.2.0,>=0.1.17->langchain)
52.   Downloading httpx-0.27.2-py3-none-any.whl (76 kB)
53.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 76.4/76.4 kB 398.9 kB/s eta 0:00:00
54. Collecting orjson<4.0.0,>=3.9.14 (from langsmith<0.2.0,>=0.1.17->langchain)
55.   Downloading orjson-3.10.11-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (142 kB)
56.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 142.5/142.5 kB 443.3 kB/s eta 0:00:00
57. Collecting requests-toolbelt<2.0.0,>=1.0.0 (from langsmith<0.2.0,>=0.1.17->langchain)
58.   Downloading requests_toolbelt-1.0.0-py2.py3-none-any.whl (54 kB)
59.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 54.5/54.5 kB 366.3 kB/s eta 0:00:00
60. Collecting annotated-types>=0.6.0 (from pydantic<3.0.0,>=2.7.4->langchain)
61.   Downloading annotated_types-0.7.0-py3-none-any.whl (13 kB)
62. Collecting pydantic-core==2.23.4 (from pydantic<3.0.0,>=2.7.4->langchain)
63.   Downloading pydantic_core-2.23.4-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (2.1 MB)
64.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 2.1/2.1 MB 393.7 kB/s eta 0:00:00
65. Requirement already satisfied: charset-normalizer<4,>=2 in /home/yongqiang/miniconda3/lib/python3.11/site-packages (from requests<3,>=2->langchain) (2.0.4)
66. Requirement already satisfied: idna<4,>=2.5 in /home/yongqiang/miniconda3/lib/python3.11/site-packages (from requests<3,>=2->langchain) (3.4)
67. Requirement already satisfied: urllib3<3,>=1.21.1 in /home/yongqiang/miniconda3/lib/python3.11/site-packages (from requests<3,>=2->langchain) (2.1.0)
68. Requirement already satisfied: certifi>=2017.4.17 in /home/yongqiang/miniconda3/lib/python3.11/site-packages (from requests<3,>=2->langchain) (2024.2.2)
69. Collecting greenlet!=0.4.17 (from SQLAlchemy<3,>=1.4->langchain)
70.   Downloading greenlet-3.1.1-cp311-cp311-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl (602 kB)
71.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 602.4/602.4 kB 393.0 kB/s eta 0:00:00
72. Collecting anyio (from httpx<1,>=0.23.0->langsmith<0.2.0,>=0.1.17->langchain)
73.   Downloading anyio-4.6.2.post1-py3-none-any.whl (90 kB)
74.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 90.4/90.4 kB 245.7 kB/s eta 0:00:00
75. Collecting httpcore==1.* (from httpx<1,>=0.23.0->langsmith<0.2.0,>=0.1.17->langchain)
76.   Downloading httpcore-1.0.6-py3-none-any.whl (78 kB)
77.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 78.0/78.0 kB 297.6 kB/s eta 0:00:00
78. Collecting sniffio (from httpx<1,>=0.23.0->langsmith<0.2.0,>=0.1.17->langchain)
79.   Downloading sniffio-1.3.1-py3-none-any.whl (10 kB)
80. Collecting h11<0.15,>=0.13 (from httpcore==1.*->httpx<1,>=0.23.0->langsmith<0.2.0,>=0.1.17->langchain)
81.   Downloading h11-0.14.0-py3-none-any.whl (58 kB)
82.      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 58.3/58.3 kB 271.6 kB/s eta 0:00:00
83. Requirement already satisfied: jsonpointer>=1.9 in /home/yongqiang/miniconda3/lib/python3.11/site-packages (from jsonpatch<2.0,>=1.33->langchain-core<0.4.0,>=0.3.15->langchain) (2.1)
84. Installing collected packages: typing-extensions, tenacity, sniffio, propcache, packaging, orjson, multidict, jsonpatch, h11, greenlet, frozenlist, annotated-types, aiohappyeyeballs, yarl, SQLAlchemy, requests-toolbelt, pydantic-core, httpcore, anyio, aiosignal, pydantic, httpx, aiohttp, langsmith, langchain-core, langchain-text-splitters, langchain
85.   Attempting uninstall: packaging
86.     Found existing installation: packaging 23.1
87.     Uninstalling packaging-23.1:
88.       Successfully uninstalled packaging-23.1
89.   Attempting uninstall: jsonpatch
90.     Found existing installation: jsonpatch 1.32
91.     Uninstalling jsonpatch-1.32:
92.       Successfully uninstalled jsonpatch-1.32
93. Successfully installed SQLAlchemy-2.0.36 aiohappyeyeballs-2.4.3 aiohttp-3.11.0 aiosignal-1.3.1 annotated-types-0.7.0 anyio-4.6.2.post1 frozenlist-1.5.0 greenlet-3.1.1 h11-0.14.0 httpcore-1.0.6 httpx-0.27.2 jsonpatch-1.33 langchain-0.3.7 langchain-core-0.3.18 langchain-text-splitters-0.3.2 langsmith-0.1.143 multidict-6.1.0 orjson-3.10.11 packaging-24.2 propcache-0.2.0 pydantic-2.9.2 pydantic-core-2.23.4 requests-toolbelt-1.0.0 sniffio-1.3.1 tenacity-9.0.0 typing-extensions-4.12.2 yarl-1.17.1
94. (base) yongqiang@yongqiang:~/langchain_work$

复制代码

References

[1] Yongqiang Cheng, https://yongqiang.blog.csdn.net/

原文地址：https://blog.csdn.net/chengyq116/article/details/143779677

---

欢迎光临 AI创想 (https://www.llms-ai.com/)

Powered by Discuz! X3.4