import os import json import re import gradio as gr import requests from duckduckgo_search import DDGS from typing import List from pydantic import BaseModel, Field from tempfile import NamedTemporaryFile from langchain_community.vectorstores import FAISS from langchain_community.document_loaders import PyPDFLoader from langchain_community.embeddings import HuggingFaceEmbeddings from llama_parse import LlamaParse from langchain_core.documents import Document # Environment variables and configurations huggingface_token = os.environ.get("HUGGINGFACE_TOKEN") llama_cloud_api_key = os.environ.get("LLAMA_CLOUD_API_KEY") # Initialize LlamaParse llama_parser = LlamaParse( api_key=llama_cloud_api_key, result_type="markdown", num_workers=4, verbose=True, language="en", ) def load_document(file: NamedTemporaryFile, parser: str = "pypdf") -> List[Document]: """Loads and splits the document into pages.""" if parser == "pypdf": loader = PyPDFLoader(file.name) return loader.load_and_split() elif parser == "llamaparse": try: documents = llama_parser.load_data(file.name) return [Document(page_content=doc.text, metadata={"source": file.name}) for doc in documents] except Exception as e: print(f"Error using Llama Parse: {str(e)}") print("Falling back to PyPDF parser") loader = PyPDFLoader(file.name) return loader.load_and_split() else: raise ValueError("Invalid parser specified. Use 'pypdf' or 'llamaparse'.") def get_embeddings(): return HuggingFaceEmbeddings(model_name="sentence-transformers/all-mpnet-base-v2") def update_vectors(files, parser): if not files: return "Please upload at least one PDF file." embed = get_embeddings() total_chunks = 0 all_data = [] for file in files: data = load_document(file, parser) all_data.extend(data) total_chunks += len(data) if os.path.exists("faiss_database"): database = FAISS.load_local("faiss_database", embed, allow_dangerous_deserialization=True) database.add_documents(all_data) else: database = FAISS.from_documents(all_data, embed) database.save_local("faiss_database") return f"Vector store updated successfully. Processed {total_chunks} chunks from {len(files)} files using {parser}." def generate_chunked_response(prompt, max_tokens=1000, max_chunks=5): API_URL = "https://api-inference.huggingface.co/models/mistralai/Mistral-7B-Instruct-v0.3" headers = {"Authorization": f"Bearer {huggingface_token}"} payload = { "inputs": prompt, "parameters": { "max_new_tokens": max_tokens, "temperature": 0.7, "top_p": 0.95, "top_k": 40, "repetition_penalty": 1.1 } } full_response = "" for _ in range(max_chunks): response = requests.post(API_URL, headers=headers, json=payload) if response.status_code == 200: result = response.json() if isinstance(result, list) and len(result) > 0: chunk = result[0].get('generated_text', '') full_response += chunk if chunk.endswith((".", "!", "?")): break else: break else: break return full_response.strip() def duckduckgo_search(query): with DDGS() as ddgs: results = ddgs.text(query, max_results=5) return results class CitingSources(BaseModel): sources: List[str] = Field( ..., description="List of sources to cite. Should be an URL of the source." ) def get_response_with_search(query): search_results = duckduckgo_search(query) context = "\n".join(f"{result['title']}\n{result['body']}\nSource: {result['href']}\n" for result in search_results if 'body' in result) prompt = f"""[INST] Using the following context: {context} Write a detailed and complete research document that fulfills the following user request: '{query}' After writing the document, please provide a list of sources used in your response. [/INST]""" generated_text = generate_chunked_response(prompt) content_start = generated_text.find("[/INST]") if content_start != -1: generated_text = generated_text[content_start + 7:].strip() parts = generated_text.split("Sources:", 1) main_content = parts[0].strip() sources = parts[1].strip() if len(parts) > 1 else "" return main_content, sources def get_response_from_pdf(query): embed = get_embeddings() if os.path.exists("faiss_database"): database = FAISS.load_local("faiss_database", embed, allow_dangerous_deserialization=True) else: return "No documents available. Please upload PDF documents to answer questions.", "" retriever = database.as_retriever() relevant_docs = retriever.get_relevant_documents(query) context_str = "\n".join([doc.page_content for doc in relevant_docs]) prompt = f"""[INST] Using the following context from the PDF documents: {context_str} Write a detailed and complete response that answers the following user question: '{query}' After writing the response, please provide a list of sources used (document names) in your answer. [/INST]""" generated_text = generate_chunked_response(prompt) content_start = generated_text.find("[/INST]") if content_start != -1: generated_text = generated_text[content_start + 7:].strip() parts = generated_text.split("Sources:", 1) main_content = parts[0].strip() sources = parts[1].strip() if len(parts) > 1 else "" return main_content, sources def chatbot_interface(message, history, use_web_search): if use_web_search: main_content, sources = get_response_with_search(message) else: main_content, sources = get_response_from_pdf(message) formatted_response = f"{main_content}\n\nSources:\n{sources}" return formatted_response # Gradio interface with gr.Blocks() as demo: gr.Markdown("# AI-powered Web Search and PDF Chat Assistant") with gr.Row(): file_input = gr.Files(label="Upload your PDF documents", file_types=[".pdf"]) parser_dropdown = gr.Dropdown(choices=["pypdf", "llamaparse"], label="Select PDF Parser", value="pypdf") update_button = gr.Button("Upload Document") update_output = gr.Textbox(label="Update Status") update_button.click(update_vectors, inputs=[file_input, parser_dropdown], outputs=update_output) with gr.Row(): chatbot = gr.Chatbot(label="Conversation") with gr.Column(): msg = gr.Textbox(label="Ask a question") use_web_search = gr.Checkbox(label="Use Web Search", value=False) submit = gr.Button("Submit") gr.Examples( examples=[ ["What are the latest developments in AI?"], ["Tell me about recent updates on GitHub"], ["What are the best hotels in Galapagos, Ecuador?"], ["Summarize recent advancements in Python programming"], ], inputs=msg, ) submit.click(chatbot_interface, inputs=[msg, chatbot, use_web_search], outputs=[chatbot]) msg.submit(chatbot_interface, inputs=[msg, chatbot, use_web_search], outputs=[chatbot]) gr.Markdown( """ ## How to use 1. Upload PDF documents using the file input at the top. 2. Select the PDF parser (pypdf or llamaparse) and click "Upload Document" to update the vector store. 3. Ask questions in the textbox. 4. Toggle "Use Web Search" to switch between PDF chat and web search. 5. Click "Submit" or press Enter to get a response. """ ) if __name__ == "__main__": demo.launch(share=True)