使用 LangGraph 在 Python 中开发高级 AI 代理_AI阅读总结 — 包阅AI

LangGraph is a specialized tool within the LangChain ecosystem designed to streamline the creation and management of AI agents. It offers a robust framework for building stateful, multi-actor applications, enhancing the capabilities of AI systems to handle complex workflows and interactions.

Key Components of LangGraph

• State: The state represents the current status of the agent. It acts as a memory, storing the context and information the agent needs to make decisions and respond appropriately during interactions.
• Node: Nodes are the fundamental units of computation in LangGraph. Each node performs specific tasks, such as processing user input or generating responses. Nodes can execute various functions, including calling APIs or running code, and they pass updated state information to the next node in the workflow.
• Edge: Edges define the control flow between nodes. They direct the sequence of operations by connecting nodes and determining the path data takes through the graph. Edges can introduce conditional logic, enabling the agent to handle different scenarios dynamically.

Building an AI Agent With LangGraph

LangGraph simplifies developing advanced AI applications by providing a clear structure for managing states, nodes and edges. This makes it easier to build intelligent, context-aware agents capable of handling complex interactions.

To create an AI agent, define the agent’s behavior and interactions using nodes and edges. For example, you can make a customer support agent that processes user queries and provides responses using OpenAI’s GPT-3.5-Turbo model. The agent’s state keeps track of the conversation context while nodes execute the necessary computations to generate responses. Edges control the flow of the conversation, ensuring the agent responds appropriately to user input.

This tutorial will guide you through building an AI agent using LangGraph, complete with step-by-step code snippets.

Setting Up the Environment

Before we begin, ensure you have the required packages installed. You can do this by running the following command in your code editor:

!pip install openai langchain_community langchain_openai langgraph

Next, import the necessary libraries and set up your environment by connecting to your OpenAI API key:

Remember to change your_openai_api_key to your actual OpenAI API key.

Creating a Simple AI Chat Agent

Let’s create a basic conversational interface using OpenAI’s GPT-3.5-Turbo model. The following function defines our chat agent:

Building a Customer Support Scenario

In this scenario, we simulate a customer named Olasammy interacting with a support agent about a faulty product he purchased. We will guide the conversation and check whether Olasammy gets a refund.

First, define the system prompt template and instructions:

Creating Nodes and Edges

We will define functions to handle the chatbot and simulate user nodes:

Conversation Continuation Logic

Define a function to decide whether to continue or end the conversation:

Building the Graph

Now, let’s build the LangGraph to manage our AI chat agent’s workflow:

Running the Simulation

Initiate the chat and observe the conversation flow:

Conclusion

LangGraph simplifies the creation of stateful, multi-actor AI applications using graph-based workflows. LangGraph’s cyclic data flows and stateful workflows open up possibilities for more sophisticated AI applications. Feel free to include enhanced conversational experiences, such as iterative interactions, customizable flows and multi-agent collaboration.

With LangGraph, developers can build more intelligent, context-aware AI systems that provide superior user interactions and solutions.

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