【LLM】langchain 和 ChatGTP 4 agents

代理

代理通过涉及LLM来确定要遵循的操作序列，从而保持一定程度的自主权。

考虑下图，在收到请求后，代理会利用LLM来决定采取哪种操作。“操作”完成后，Agent将进入“观察”步骤。从观察步骤开始，代理人分享一个想法；如果没有达到最终答案，Agent会循环返回到另一个Action，以便更接近最终答案。

LangChain代理可以使用一系列操作。

下面的代码显示了LangChain代理回答一个极其模糊和复杂的问题的完整工作示例：

Who is regarded as the father of the iPhone and what is the square root of his year of birth?

代理人可以采取一些行动：

LLM数学，

以下是SerpApi网站的截图。SerpApi使得从搜索引擎结果中提取数据变得可行。

GPT-4（GPT-4–0314）。

用于代理的操作以以下方式加载：

tools=load_tools（[“serpapi”，“llm-math”]，llm=llm）

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这是完整的代码，您可以复制、粘贴到笔记本中并运行。你可以把问题改成你想问特工的任何问题。显然，插入SerpApi和OpenAI的API密钥。

pip install langchain
pip install google-search-results
pip install openai

from langchain.agents import load_tools
from langchain.agents import initialize_agent
from langchain.agents import AgentType
from langchain.llms import OpenAI

import os
os.environ['OPENAI_API_KEY'] = str("xxxxxxxxxx")
os.environ["SERPAPI_API_KEY"] = str("xxxxxxxxxx")
llm = OpenAI(temperature=0,model_name='gpt-4-0314')

tools = load_tools(["serpapi", "llm-math"], llm=llm)

agent = initialize_agent(tools, llm, agent=AgentType.ZERO_SHOT_REACT_DESCRIPTION, verbose=True)

agent.run("Who is regarded as the farther of the iPhone and what is the square root of his year of birth?")

以下是代理的文本回复和笔记本上的屏幕截图：

> Entering new AgentExecutor chain...
I need to find out who is regarded as the father of the iPhone and his year of birth. Then, I will calculate the square root of his year of birth.
Action: Search
Action Input: father of the iPhone year of birth
Observation: Family. Steven Paul Jobs was born in San Francisco, California, on February 24, 1955, to Joanne Carole Schieble and Abdulfattah "John" Jandali (Arabic: عبد الف ...
Thought:I found that Steve Jobs is regarded as the father of the iPhone and he was born in 1955. Now I will calculate the square root of his year of birth.
Action: Calculator
Action Input: sqrt(1955)
Observation: Answer: 44.21538193886829
Thought:I now know the final answer.
Final Answer: Steve Jobs is regarded as the father of the iPhone, and the square root of his year of birth (1955) is approximately 44.22.

> Finished chain.
'Steve Jobs is regarded as the father of the iPhone, and the square root of his year of birth (1955) is approximately 44.22.

选择正确的代理类型在代理的输出中起着重要作用。下面您可以看到LangChain框架中可用代理类型的列表。

当代理类型从ZERO_SHOT_REACT_DESCRIPTION更改为CHAT_ZERO_SHO _REACT_DESCRIPTON时，输出看起来非常不同：

> Entering new AgentExecutor chain...
Thought: I need to find out who is regarded as the father of the iPhone and his year of birth. Then, I will calculate the square root of his year of birth.
Action:
```
{
"action": "Search",
"action_input": "father of the iPhone year of birth"
}
```
Observation: Family. Steven Paul Jobs was born in San Francisco, California, on February 24, 1955, to Joanne Carole Schieble and Abdulfattah "John" Jandali (Arabic: عبد الف ...
Thought:Steve Jobs is regarded as the father of the iPhone, and he was born in 1955. Now I will calculate the square root of 1955.
Action:
```
{
"action": "Calculator",
"action_input": "sqrt(1955)"
}
```

Observation: Answer: 44.21538193886829
Thought:I now know the final answer.
Final Answer: Steve Jobs is regarded as the father of the iPhone, and the square root of his year of birth (1955) is approximately 44.22.

> Finished chain.
'Steve Jobs is regarded as the father of the iPhone, and the square root of his year of birth (1955) is approximately 44.22.

以Actions的形式为Agent配备许多工具，这肯定会使Agent更加自主和足智多谋。

然而，这是有代价的，因为每个Agent交互的每次调用API的费用可能会很快增加。