refine code

ppcls/engine/engine.py

@@ -261,14 +261,6 @@ class Engine(object):
             if metric_info is not None:
                 best_metric.update(metric_info)
 
-        # for amp training
-        if self.amp:
-            self.scaler = paddle.amp.GradScaler(
-                init_loss_scaling=self.scale_loss,
-                use_dynamic_loss_scaling=self.use_dynamic_loss_scaling)
-            if self.config['AMP']['use_pure_fp16'] is True:
-                self.model = paddle.amp.decorate(models=self.model, level='O2')
-
         self.max_iter = len(self.train_dataloader) - 1 if platform.system(
         ) == "Windows" else len(self.train_dataloader)
         for epoch_id in range(best_metric["epoch"] + 1,