Update app.py

updated import: from langchain_classic.chains.combine_documents import create_stuff_documents_chain
from langchain_classic.chains import create_retrieval_chain
from langchain_classic.chains import RetrievalQA

app.py

@@ -6,9 +6,13 @@ from langchain_text_splitters import RecursiveCharacterTextSplitter
 from langchain_community.vectorstores import Chroma
 from langchain_community.document_loaders import PyPDFLoader
 from langchain_community.embeddings import HuggingFaceEmbeddings
-from langchain.chains.combine_documents import create_stuff_documents_chain
-from langchain.chains import create_retrieval_chain
-from langchain_core.prompts import ChatPromptTemplate
+# from langchain.chains.combine_documents import create_stuff_documents_chain
+# from langchain.chains import create_retrieval_chain
+# from langchain_core.prompts import ChatPromptTemplate
+
+from langchain_classic.chains.combine_documents import create_stuff_documents_chain
+from langchain_classic.chains import create_retrieval_chain
+from langchain_classic.chains import RetrievalQA
 
 # 1. LLM SETUP (Using Granite via HF API)
 def get_llm():