Fix:update access lyrs for yolo8.

app.py

@@ -78,7 +78,7 @@ def process_image(image, yolo_versions=["yolov5"]):
         if yolo_version == "yolov5":
             target_layers = [model.model.model.model[-2]]  # Assumes last layer is used for Grad-CAM
         else:
-            target_layers = [model.model.backbone[-1]]
+            target_layers = [model.model.model[-1]]
         # Run YOLO detection
         results = model([rgb_img])
         boxes, colors, names = parse_detections(results)