Update app.py

app.py

@@ -4,8 +4,8 @@ from langchain_community.embeddings import HuggingFaceEmbeddings
 from langchain_community.vectorstores import FAISS
 from langchain_huggingface import HuggingFacePipeline
 from transformers import pipeline, AutoModelForCausalLM, AutoTokenizer, BitsAndBytesConfig
-from langchain.chains import create_retrieval_chain
-from langchain.chains.combine_documents import create_stuff_documents_chain
+from langchain_classic.chains import create_retrieval_chain
+from langchain_classic.chains.combine_documents import create_stuff_documents_chain
 from langchain_core.prompts import PromptTemplate
 
 # ==========================================