No need to load pretrained backbone

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

isc.py

@@ -56,7 +56,7 @@ class Isc(NNOperator):
         if checkpoint_path is None:
             checkpoint_path = os.path.join(str(Path(__file__).parent), 'checkpoints', timm_backbone + '.pth')
 
-        backbone = timm.create_model(timm_backbone, features_only=True, pretrained=True)
+        backbone = timm.create_model(timm_backbone, features_only=True, pretrained=False)
         self.model = isc.create_model(pretrained=True, checkpoint_path=checkpoint_path, device=self.device,
                                       backbone=backbone, p=3.0, eval_p=1.0)
         self.model.eval()