Update app.py

app.py

@@ -13,7 +13,7 @@ repo = "ByteDance/SDXL-Lightning"
 ckpt = "sdxl_lightning_4step_unet.safetensors" # Use the correct ckpt for your step setting!
 # Load model.
 pipe_box=[]
-@spaces.GPU
+@spaces.GPU()
 def init():
     device="cuda:0"
     unet = UNet2DConditionModel.from_config(base, subfolder="unet").to(device, torch.float16)