Update app.py

app.py

@@ -61,7 +61,10 @@ print("Finish the model init process")
 
 def qa(question: str) -> str:
     
-
+    vectordb = Chroma(
+                    persist_directory="./resource/chroma/",
+                    embedding_function=embeddings
+                )
     docs = vectordb.max_marginal_relevance_search(question,k=3)