Update optimizer.py (#43201)

python/paddle/optimizer/optimizer.py

@@ -338,9 +338,6 @@ class Optimizer(object):
                 adam.set_state_dict(opti_state_dict)
 
         '''
-        if isinstance(self._learning_rate, LRScheduler):
-            self._learning_rate.set_dict(state_dict["LR_Scheduler"])
-
         if isinstance(self._learning_rate, LRScheduler):
             self._learning_rate.set_state_dict(state_dict["LR_Scheduler"])