Update app.py

app.py

@@ -4,3 +4,19 @@ from langchain_community.document_loaders import PYPDFloader
 from langchain.txt_sliter import recursiveCharacterTextSpliter
 from langchain_community.vectorstores import chroma
 from langchain.chains import ConversationalRetrievalChain
+from langchain_community.embeddings import HuggingFaceEmbeddings
+from langchain_community.llms mport HuggingFacePipeline
+from langchain.chains import ConversationalRetrievalChain
+from langchain.memory import ConversationBufferMemory
+from langchain_community.llms import HuggingFaceEdpoint
+from pathlib import path
+import chromadb
+from unidecode importunidecode
+from transformers import Auto Tokenizer
+import transformers
+import torch
+import tqdm
+import acceierate
+import re
+defacult_persist_directry=`./chroma_HF/`
+