fix model loading bug

app.py

@@ -24,6 +24,7 @@ from argparse import ArgumentParser
 from torchvision.transforms.functional import pil_to_tensor
 
 from metauas import MetaUAS, set_random_seed, normalize, apply_ad_scoremap, safely_load_state_dict
+from huggingface_hub import hf_hub_download
 
 device = 'cuda' if torch.cuda.is_available() else 'cpu'