Update app.py

app.py

@@ -300,6 +300,8 @@ vector_store_HF = Chroma(
     embedding_function=embeddings_HuggingFace)
 print("vector_store_HF:",vector_store_HF._collection.count(),"chunks.")
 
+with open("embeddings.pkl", "wb") as f:
+    pickle.dump(vector_store_HF, f)
 
 # Now we create the code to retrieve embeddings from the vectorstore (again, sticking with HF)