fix bug for warmup_steps setting

ppcls/optimizer/learning_rate.py

@@ -56,9 +56,8 @@ class LRBase(object):
         self.step_each_epoch = step_each_epoch
         self.learning_rate = learning_rate
         self.warmup_epoch = warmup_epoch
-        self.warmup_steps = round(
-            self.warmup_epoch *
-            self.step_each_epoch) if by_epoch else self.warmup_epoch
+        self.warmup_steps = self.warmup_epoch if by_epoch else round(
+            self.warmup_epoch * self.step_each_epoch)
         self.warmup_start_lr = warmup_start_lr
         self.last_epoch = last_epoch
         self.by_epoch = by_epoch