Update app.py

app.py

@@ -8,6 +8,8 @@ from t2v_metrics import VQAScore, list_all_vqascore_models
 def update_model(model_name):
     return VQAScore(model=model_name, device="cuda") 
 
+global model_pipe
+
 # Global model variable, but do not initialize or move to CUDA here
 cur_model_name = "clip-flant5-xl"
 model_pipe = update_model(cur_model_name)