Debug to support triton

Signed-off-by: Jael Gu <mengjia.gu@zilliz.com>

isc.py

@@ -114,7 +114,8 @@ class Isc(NNOperator):
 
     @property
     def backbone(self):
-        return self.model.backbone
+        backbone = timm.create_model(self.timm_backbone, features_only=True, pretrained=False)
+        return backbone
 
     def save_model(self, format: str = 'pytorch', path: str = 'default'):
         if path == 'default':