diff --git a/colossalai/trainer/hooks/_lr_scheduler_hook.py b/colossalai/trainer/hooks/_lr_scheduler_hook.py
index 6f39e4400..c6da33442 100644
--- a/colossalai/trainer/hooks/_lr_scheduler_hook.py
+++ b/colossalai/trainer/hooks/_lr_scheduler_hook.py
@@ -18,6 +18,7 @@ class LRSchedulerHook(MetricHook):
             defaults to 1. If different hooks share same priority, the order of printing would
             depend on the hooks order in the hook list.
     """
+
     def __init__(
         self,
         lr_scheduler,