my_memory_logic.py

# my_memory_logic.py
from langchain.memory import ConversationBufferMemory
from langchain.chat_models import ChatOpenAI
from langchain.chains import LLMChain
from langchain.prompts.chat import ChatPromptTemplate, SystemMessagePromptTemplate, MessagesPlaceholder, HumanMessagePromptTemplate

memory = ConversationBufferMemory(return_messages=True)

restatement_system_prompt = (
    "Given a chat history and the latest user question "
    "which might reference context in the chat history, ..."
)

restatement_prompt = ChatPromptTemplate.from_messages([
    SystemMessagePromptTemplate.from_template(restatement_system_prompt),
    MessagesPlaceholder(variable_name="chat_history"),
    HumanMessagePromptTemplate.from_template("{input}")
])

restatement_llm = ChatOpenAI(model_name="gpt-3.5-turbo", temperature=0.0)
restatement_chain = LLMChain(llm=restatement_llm, prompt=restatement_prompt)