Try to fetch DPT model in advance

gradio_demo.py

@@ -8,11 +8,13 @@ from marble import (
     run_parametric_control,
     setup_control_mlps,
     setup_pipeline,
+    get_dpt_model,
 )
 
 # Setup the pipeline and control MLPs
 control_mlps = setup_control_mlps()
 ip_adapter = setup_pipeline()
+get_dpt_model()
 get_session()
 
 # Load example images