Add Memory to OpenAI Functions Agent

This notebook goes over how to add memory to an OpenAI Functions agent.

from langchain.agents import AgentType, Tool, initialize_agent
from langchain.chains import LLMMathChain
from langchain.chat_models import ChatOpenAI
from langchain.utilities import SerpAPIWrapper, SQLDatabase
from langchain_experimental.sql import SQLDatabaseChain

llm = ChatOpenAI(temperature=0, model="gpt-3.5-turbo-0613")
search = SerpAPIWrapper()
llm_math_chain = LLMMathChain.from_llm(llm=llm, verbose=True)
db = SQLDatabase.from_uri("sqlite:///../../../../../notebooks/Chinook.db")
db_chain = SQLDatabaseChain.from_llm(llm, db, verbose=True)
tools = [
    Tool(
        name="Search",
        func=search.run,
        description="useful for when you need to answer questions about current events. You should ask targeted questions",
    ),
    Tool(
        name="Calculator",
        func=llm_math_chain.run,
        description="useful for when you need to answer questions about math",
    ),
    Tool(
        name="FooBar-DB",
        func=db_chain.run,
        description="useful for when you need to answer questions about FooBar. Input should be in the form of a question containing full context",
    ),
]

from langchain.memory import ConversationBufferMemory
from langchain.prompts import MessagesPlaceholder

agent_kwargs = {
    "extra_prompt_messages": [MessagesPlaceholder(variable_name="memory")],
}
memory = ConversationBufferMemory(memory_key="memory", return_messages=True)

agent = initialize_agent(
    tools,
    llm,
    agent=AgentType.OPENAI_FUNCTIONS,
    verbose=True,
    agent_kwargs=agent_kwargs,
    memory=memory,
)

agent.run("hi")

> Entering new  chain...
Hello! How can I assist you today?

> Finished chain.

'Hello! How can I assist you today?'

agent.run("my name is bob")

> Entering new  chain...
Nice to meet you, Bob! How can I help you today?

> Finished chain.

'Nice to meet you, Bob! How can I help you today?'

agent.run("whats my name")

> Entering new  chain...
Your name is Bob.

> Finished chain.

'Your name is Bob.'