Update app.py

app.py

@@ -20,7 +20,7 @@ from langchain.chains import RetrievalQA
 #documents = loader.load()
      
 #texts = text_splitter.split_documents(documents)
-db = Chroma.from_documents(persist_directory=chroma_db, embedding_function=embeddings)
+db = Chroma.from_documents(persist_directory='chroma_db', embedding_function=embeddings)
 retriever = db.as_retriever()
 global qa 
 qa = RetrievalQA.from_chain_type(llm=model_id, chain_type="stuff", retriever=retriever, return_source_documents=True)