Update app.py

app.py

@@ -346,11 +346,11 @@ def track_video(n_frames, video_state):
     sam2_checkpoint = "./sam2/SAM2-Video-Predictor/checkpoints/sam2_hiera_large.pt"
     config = "sam2_hiera_l.yaml"
     video_predictor_local = build_sam2_video_predictor(
-        config, sam2_checkpoint, device=sam_device
+        config, sam2_checkpoint, device="cuda"
     )
 
     inference_state = video_predictor_local.init_state(
-        images=images / 255, device=sam_device
+        images=images / 255, device="cuda"
     )
 
     if len(torch.from_numpy(video_state["masks"][0]).shape) == 3: