app.py

# Import librairies  

from pathlib import Path
import sys
import os 
import openai
import llama_index
from llama_index import SimpleDirectoryReader, GPTListIndex, readers, LLMPredictor, PromptHelper, ServiceContext, GPTVectorStoreIndex, StorageContext, load_index_from_storage, download_loader,  GPTRAKEKeywordTableIndex
from llama_index.retrievers import VectorIndexRetriever
from langchain import OpenAI
from IPython.display import Markdown, display
from llama_index.node_parser import SimpleNodeParser
import gradio as gr
from llama_index.optimization.optimizer import SentenceEmbeddingOptimizer
from langchain.chat_models import ChatOpenAI
from llama_index.readers import Document
import io
from PyPDF2 import PdfReader
from azure.storage.filedatalake import DataLakeServiceClient
from llama_index.indices.vector_store.base import GPTVectorStoreIndex
from pyspark.sql.functions import col
from adlfs import AzureBlobFileSystem
import time