五、智能體架構(gòu)：Agent

5.1 什么是智能體（Agent）

將大語言模型作為一個(gè)推理引擎。給定一個(gè)任務(wù)，智能體自動生成完成任務(wù)所需的步驟，執(zhí)行相應(yīng)動作（例如選擇并調(diào)用工具），直到任務(wù)完成。

5.2 先定義一些工具：Tools

• 可以是一個(gè)函數(shù)或三方 API
• 也可以把一個(gè) Chain 或者 Agent 的 run()作為一個(gè) Tool

from langchain import SerpAPIWrapper

search = SerpAPIWrapper()
tools = [
    Tool.from_function(
        func=search.run,
        name="Search",
        description="useful for when you need to answer questions about current events"
    ),
]


from langchain.tools import Tool, tool
import calendar
import dateutil.parser as parser
from datetime import date

@tool("weekday")
def weekday(date_str: str) -> str:
    """Convert date to weekday name"""
    d = parser.parse(date_str)
    return calendar.day_name[d.weekday()]


from langchain.agents import load_tools

tools = load_tools(["serpapi"])
tools += [weekday]

5.3 智能體類型：ReAct

!pip install google-search-results

from langchain.chat_models import ChatOpenAI
from langchain.llms import OpenAI
from langchain.agents import AgentType
from langchain.agents import initialize_agent

llm = ChatOpenAI(model_name=‘gpt-4’, temperature=0)

agent = initialize_agent(
tools, llm, agent=AgentType.ZERO_SHOT_REACT_DESCRIPTION, verbose=True)
agent.run(“周杰倫生日那天是星期幾”)

5.4 通過 OpenAI Function Calling 實(shí)現(xiàn)智能體

from langchain.chat_models import ChatOpenAI
from langchain.llms import OpenAI
from langchain.agents import AgentType
from langchain.agents import initialize_agent

llm = ChatOpenAI(model_name=‘gpt-4-0613’, temperature=0)

agent = initialize_agent(
tools,
llm,
agent=AgentType.OPENAI_FUNCTIONS,
verbose=True,
max_iterations=2,
early_stopping_method=“generate”,
)
agent.run(“周杰倫生日那天是星期幾”)

5.5 智能體類型：SelfAskWithSearch

from langchain import OpenAI, SerpAPIWrapper
from langchain.agents import initialize_agent, Tool
from langchain.agents import AgentType

llm = OpenAI(temperature=0)
search = SerpAPIWrapper()
tools = [
Tool(
name=“Intermediate Answer”,
func=search.run,
description=“useful for when you need to ask with search”,
)
]

self_ask_with_search = initialize_agent(
tools, llm, agent=AgentType.SELF_ASK_WITH_SEARCH, verbose=True
)
self_ask_with_search.run(
“馮小剛的老婆演過什么電影”
)

5.6 智能體類型：Plan-and-Execute

!pip install langchain-experimental

from langchain.utilities.wolfram_alpha import WolframAlphaAPIWrapper
from langchain.agents import load_tools
from langchain import SerpAPIWrapper
from langchain.agents.tools import Tool
from langchain.llms import OpenAI
from langchain_experimental.plan_and_execute import PlanAndExecute, load_agent_executor, load_chat_planner
from langchain.chat_models import ChatOpenAI
from langchain.memory import ConversationSummaryMemory

llm = ChatOpenAI(model_name=‘gpt-4’, temperature=0)

search = SerpAPIWrapper(params={
‘engine’: ‘google’,
‘gl’: ‘cn’,
‘google_domain’: ‘google.com.hk’,
‘hl’: ‘zh-cn’
})

tools = [
Tool(
name=“Search”,
func=search.run,
description=“useful for when you need to answer questions about current events”
)
]

planner = load_chat_planner(llm)
executor = load_agent_executor(llm, tools, verbose=True)
agent = PlanAndExecute(planner=planner, executor=executor, verbose=True)

agent.run(“分析北京明天天氣，與上海明天天氣對比，用中文寫一遍報(bào)告”)

后記

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