fix an issue of diff-privacy

mindarmour/privacy/diff_privacy/train/model.py

@@ -137,7 +137,7 @@ class DPModel(Model):
 
         if clip_mech is None or isinstance(clip_mech, Cell):
             self._clip_mech = clip_mech
-        super(DPModel, self).__init__(**kwargs)
+        super(DPModel, self).__init__(optimizer=optimizer, **kwargs)
 
         # judge device_target, only GPU or Ascend is supported until now
         device = context.get_context("device_target")