Update app.py

app.py

@@ -45,7 +45,7 @@ if 'llm' not in st.session_state:
 
 @st.cache_resource # cache model embeddings, avoid model reloading each runtime
 def load_embeddings():
-    return HuggingFaceEmbeddings(model_name='bkai-foundation-models/vietnamese-bi-encoder')
+    return HuggingFaceEmbeddings(model_name='nomic-embeded-text-v1.5')
 
 
 # set up config