In this blog, explore the potential of LangChain agents, a framework powered by large language models, to create intelligent applications that excel in natural language processing, text generation, and more.
LangChain is an open-source framework designed for developing applications that utilize large language models (LLMs). The framework offers a standardized interface for constructing chains, a multitude of integrations with various tools, and pre-built end-to-end chains tailored for common applications.
LangChain agents are specialized components within the LangChain framework that interact with the real world. These agents are specifically designed to perform well-defined tasks, such as answering questions, generating text, translating languages, and summarizing text. They serve as tools for automating tasks and engaging with real-world scenarios.
LangChain agents harness the capabilities of large language models (LLMs) to process natural language input and generate corresponding output. These LLMs have undergone extensive training on vast datasets comprising text and code, equipping them to excel at various tasks, including comprehending queries, text generation, and language translation.
The fundamental architecture of a LangChain agent is structured as follows:
The key components of LangChain agents include the agent itself, external tools, and toolkits:
By gaining an understanding of LangChain and its agent-based architecture, users can harness its potential for creating intelligent applications that proficiently process and generate natural language text.
Agents use a combination of an LLM (or an LLM Chain) as well as a Toolkit in order to perform a predefined series of steps to accomplish a goal. For this example, we will use Wikipedia, DuckDuckGo, and Arxiv tools to build a simple agent to write an essay. There’s a long list of tools available [here](https://python.langchain.com/docs/integrations/tools/) that an agent can use to interact with the outside world.
For this example we are required to install Langchain and the tools mentioned above, assuming you have a Python3.8 environment on your machine.
pip install arxiv wikipedia duckduckgo-search langchain openai
from langchain.tools import Tool, DuckDuckGoSearchRun, ArxivQueryRun, WikipediaQueryRun
from langchain.utilities import WikipediaAPIWrapper
from langchain.agents import initialize_agent
from langchain.agents import AgentType
from langchain.chat_models import ChatOpenAI
from langchain.chains import LLMChain
from langchain.prompts import PromptTemplate
search = DuckDuckGoSearchRun()
arxiv = ArxivQueryRun()
wiki = WikipediaQueryRun(api_wrapper=WikipediaAPIWrapper())
This initializes the DuckDuckGo search tool along with Arxiv and the Wikipedia tool provided by LangChain. These tools will help us to build our essay agent. The DuckDuckGo tool allows you to search the web using DuckDuckGo and retrieve the results, the Arxiv tool will have access to publications in Arxiv.org and the Wikipedia tool will search the Wikipedia articles.
This section sets up an essay tool using the ChatOpenAI model from LangChain. We define a prompt template for writing an essay, create a chain using the model and the prompt, and then define the tool.
Here, we're creating a new tool using the `Tool.from_function` method.
Here, we're initializing an agent with the tools we've defined. This agent will be able to write an essay for the topic provided by the user, the agent would gather the necessary information from the web, Wikipedia, or Arxiv articles.
Finally, we define a prompt for our agent and run it. The agent will search the web, Arxiv articles, and Wikipedia for information about global warming, fetch the content, and then write an essay on it.
In conclusion, LangChain agents offer several distinct advantages:
As advancements in language models continue to unfold, the potential for LangChain agents to become more potent and flexible also increases. This progress holds the potential to revolutionize our interactions with computers and reshape content creation processes. Looking ahead, there are several exciting ways in which LangChain agents could be employed:
The future holds immense promise for the evolution of LangChain agents, marking a pivotal step towards a more interactive and intelligent digital landscape.
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