Fix device issue when save_model

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

nn_fingerprint.py

@@ -157,7 +157,7 @@ class NNFingerprint(NNOperator):
             path = os.path.join(path, name)
         dummy_input = torch.rand(
             (1,) + (self.params['n_mels'], self.params['u'])
-        )
+        ).to(self.device)
         if format == 'pytorch':
             path = path + '.pt'
             torch.save(self.model, path)