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| import streamlit as st | |
| from langchain.prompts import PromptTemplate | |
| from langchain.chains.question_answering import load_qa_chain | |
| from langchain.text_splitter import RecursiveCharacterTextSplitter | |
| from langchain.vectorstores import Chroma | |
| from langchain_google_genai import GoogleGenerativeAIEmbeddings, ChatGoogleGenerativeAI | |
| from dotenv import load_dotenv | |
| import PyPDF2 | |
| import os | |
| import io | |
| st.title("Chat Your PDFs") # Updated title | |
| # Load environment variables from .env file | |
| load_dotenv() | |
| # Retrieve API key from environment variable | |
| google_api_key = os.getenv("GOOGLE_API_KEY") | |
| # Check if the API key is available | |
| if google_api_key is None: | |
| st.warning("API key not found. Please set the google_api_key environment variable.") | |
| st.stop() | |
| # File Upload with user-defined name | |
| uploaded_file = st.file_uploader("Upload a PDF file", type=["pdf"]) | |
| if uploaded_file is not None: | |
| st.text("PDF File Uploaded Successfully!") | |
| # PDF Processing (using PyPDF2 directly) | |
| pdf_data = uploaded_file.read() | |
| pdf_reader = PyPDF2.PdfReader(io.BytesIO(pdf_data)) | |
| pdf_pages = pdf_reader.pages | |
| # Create Context | |
| context = "\n\n".join(page.extract_text() for page in pdf_pages) | |
| # Split Texts | |
| text_splitter = RecursiveCharacterTextSplitter(chunk_size=10000, chunk_overlap=200) | |
| texts = text_splitter.split_text(context) | |
| # Chroma Embeddings | |
| embeddings = GoogleGenerativeAIEmbeddings(model="models/embedding-001") | |
| vector_index = Chroma.from_texts(texts, embeddings).as_retriever() | |
| # Get User Question | |
| user_question = st.text_input("Ask a Question:") | |
| if st.button("Get Answer"): | |
| if user_question: | |
| # Get Relevant Documents | |
| docs = vector_index.get_relevant_documents(user_question) | |
| # Define Prompt Template | |
| prompt_template = """ | |
| Answer the question as detailed as possible from the provided context, | |
| make sure to provide all the details, if the answer is not in | |
| provided context just say, "answer is not available in the context", | |
| don't provide the wrong answer\n\n | |
| Context:\n {context}?\n | |
| Question: \n{question}\n | |
| Answer: | |
| """ | |
| # Create Prompt | |
| prompt = PromptTemplate(template=prompt_template, input_variables=['context', 'question']) | |
| # Load QA Chain | |
| model = ChatGoogleGenerativeAI(model="gemini-pro", temperature=0.3, api_key=google_api_key) | |
| chain = load_qa_chain(model, chain_type="stuff", prompt=prompt) | |
| # Get Response | |
| response = chain({"input_documents": docs, "question": user_question}, return_only_outputs=True) | |
| # Display Answer | |
| st.subheader("Answer:") | |
| st.write(response['output_text']) | |
| else: | |
| st.warning("Please enter a question.") | |