Create app.py

app.py

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+import os
+import logging
+import time
+from dotenv import load_dotenv
+import streamlit as st
+from PyPDF2 import PdfReader
+from langchain.text_splitter import CharacterTextSplitter
+from langchain_cohere import CohereEmbeddings
+from langchain.vectorstores import FAISS
+from langchain.memory import ConversationBufferMemory
+from langchain.chains import ConversationalRetrievalChain
+from langchain_groq import ChatGroq
+
+# Load environment variables
+load_dotenv()
+
+# Set up logging
+logging.basicConfig(
+    level=logging.INFO,
+    format="%(asctime)s - %(levelname)s - %(message)s"
+)
+
+# Function to extract text from PDF files
+def get_pdf_text(pdf_docs):
+    text = ""
+    for pdf in pdf_docs:
+        pdf_reader = PdfReader(pdf)
+        for page in pdf_reader.pages:
+            text += page.extract_text()
+    return text
+
+# Function to split the extracted text into chunks
+def get_text_chunks(text):
+    text_splitter = CharacterTextSplitter(
+        separator="\n",
+        chunk_size=1000,
+        chunk_overlap=200,
+        length_function=len
+    )
+    chunks = text_splitter.split_text(text)
+    return chunks
+
+# Function to create a FAISS vectorstore with rate-limiting and retry logic
+def get_vectorstore(text_chunks):
+    cohere_api_key = os.getenv("COHERE_API_KEY")
+    embeddings = CohereEmbeddings(model="embed-english-v3.0", cohere_api_key=cohere_api_key)
+    
+    vectorstore = None
+    batch_size = 10  # Process chunks in batches of 10
+    for i in range(0, len(text_chunks), batch_size):
+        batch = text_chunks[i:i+batch_size]
+        retry_count = 0
+        
+        while retry_count < 5:  # Retry up to 5 times
+            try:
+                if vectorstore is None:
+                    vectorstore = FAISS.from_texts(texts=batch, embedding=embeddings)
+                else:
+                    vectorstore.add_texts(batch, embedding=embeddings)
+                break  # Exit retry loop if successful
+            except Exception as e:
+                if "rate limit" in str(e).lower():
+                    logging.warning(f"Rate limit exceeded. Retrying batch {i//batch_size + 1} in {2 ** retry_count} seconds...")
+                    time.sleep(2 ** retry_count)  # Exponential backoff
+                    retry_count += 1
+                else:
+                    raise e  # Raise other errors
+    return vectorstore
+
+# Function to set up the conversational retrieval chain
+def get_conversation_chain(vectorstore):
+    try:
+        llm = ChatGroq(model="llama-3.1-70b-versatile", temperature=0.5)
+        memory = ConversationBufferMemory(memory_key="chat_history", return_messages=True)
+        
+        conversation_chain = ConversationalRetrievalChain.from_llm(
+            llm=llm,
+            retriever=vectorstore.as_retriever(),
+            memory=memory
+        )
+        
+        logging.info("Conversation chain created successfully.")
+        return conversation_chain
+    except Exception as e:
+        logging.error(f"Error creating conversation chain: {e}")
+        st.error("An error occurred while setting up the conversation chain.")
+
+# Handle user input
+def handle_userinput(user_question):
+    if st.session_state.conversation is not None:
+        response = st.session_state.conversation({"question": user_question})
+        st.session_state.chat_history = response["chat_history"]
+
+        for i, message in enumerate(st.session_state.chat_history):
+            if i % 2 == 0:
+                st.write(f"*User:* {message.content}")
+            else:
+                st.write(f"*Bot:* {message.content}")
+    else:
+        st.warning("Please process the documents first.")
+
+# Main function to run the Streamlit app
+def main():
+    load_dotenv()
+    st.set_page_config(page_title="Chat with multiple PDFs", page_icon=":books:")
+
+    if "conversation" not in st.session_state:
+        st.session_state.conversation = None
+    if "chat_history" not in st.session_state:
+        st.session_state.chat_history = None
+
+    st.header("Chat with multiple PDFs :books:")
+    user_question = st.text_input("Ask a question about your documents:")
+    if user_question:
+        handle_userinput(user_question)
+
+    with st.sidebar:
+        st.subheader("Your documents")
+        pdf_docs = st.file_uploader(
+            "Upload your PDFs here and click on 'Process'", accept_multiple_files=True
+        )
+        if st.button("Process"):
+            with st.spinner("Processing..."):
+                raw_text = get_pdf_text(pdf_docs)
+                text_chunks = get_text_chunks(raw_text)
+                vectorstore = get_vectorstore(text_chunks)
+                st.session_state.conversation = get_conversation_chain(vectorstore)
+
+if __name__ == "__main__":
+    main()