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import streamlit as st
from langchain_community.document_loaders import PyPDFLoader
from langchain_mistralai.chat_models import ChatMistralAI
from langchain_mistralai.embeddings import MistralAIEmbeddings
from langchain_community.vectorstores import FAISS
from langchain.text_splitter import RecursiveCharacterTextSplitter
from langchain.chains.combine_documents import create_stuff_documents_chain
from langchain_core.prompts import ChatPromptTemplate
from langchain.chains import create_retrieval_chain
st.title("PDF Question Answering with LangChain")
# Upload PDF
uploaded_file = st.file_uploader("Upload a PDF file", type=["pdf"])
if uploaded_file:
with open("uploaded.pdf", "wb") as f:
f.write(uploaded_file.getbuffer())
# Load data
loader = PyPDFLoader("uploaded.pdf")
docs = loader.load()
# Split text into chunks
text_splitter = RecursiveCharacterTextSplitter()
documents = text_splitter.split_documents(docs)
# API Key input
api_key = st.text_input("Enter your MistralAI API Key", type="password")
if api_key:
try:
# Define the embedding model
embeddings = MistralAIEmbeddings(model="mistral-embed", mistral_api_key=api_key)
# Create the vector store
vector = FAISS.from_documents(documents, embeddings)
# Define a retriever interface
retriever = vector.as_retriever()
# Define LLM
model = ChatMistralAI(mistral_api_key=api_key)
# Define prompt template
prompt = ChatPromptTemplate.from_template("""Answer the following question based only on the provided context:
<context>
{context}
</context>
Question: {input}""")
# Create a retrieval chain to answer questions
document_chain = create_stuff_documents_chain(model, prompt)
retrieval_chain = create_retrieval_chain(retriever, document_chain)
# User prompt input
user_prompt = st.text_input("Enter your question")
if user_prompt:
with st.spinner("Processing..."):
response = retrieval_chain.invoke({"input": user_prompt})
if "answer" in response:
st.write(response["answer"])
else:
st.write("No answer found.")
except Exception as e:
st.error(f"Error: {e}")
# Print or log detailed error information for debugging
st.exception(e)
else:
st.write("Please upload a PDF file to get started.")
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