Update app.py

app.py

@@ -4,19 +4,13 @@ import streamlit as st
 import os
 import sys
 import shutil
-from langchain.text_splitter import TokenTextSplitter,RecursiveCharacterTextSplitter
+from langchain.text_splitter import TokenTextSplitter,RecursiveCharacterTextSplitter,CharacterTextSplitter
 from langchain.document_loaders import PyPDFLoader
 from langchain.document_loaders.pdf import PyPDFDirectoryLoader
 from langchain_community.embeddings import HuggingFaceEmbeddings
 from transformers import pipeline
 import torch
-from transformers import AutoTokenizer, AutoModelForCausalLM, BitsAndBytesConfig,AutoModelForSeq2SeqLM
-from langchain.retrievers.self_query.base import SelfQueryRetriever
 from langchain.chains.query_constructor.base import AttributeInfo
-from langchain.retrievers import ContextualCompressionRetriever
-from langchain.retrievers.document_compressors import LLMChainExtractor
-from langchain_huggingface.llms import HuggingFacePipeline
-from langchain.text_splitter import CharacterTextSplitter, RecursiveCharacterTextSplitter
 from langchain.vectorstores import DocArrayInMemorySearch
 from langchain.document_loaders import TextLoader
 from langchain.chains import RetrievalQA,  ConversationalRetrievalChain