diff --git a/applications/ColossalChat/coati/trainer/dpo.py b/applications/ColossalChat/coati/trainer/dpo.py
index 2854c81da..25a3d32ee 100755
--- a/applications/ColossalChat/coati/trainer/dpo.py
+++ b/applications/ColossalChat/coati/trainer/dpo.py
@@ -382,7 +382,7 @@ class DPOTrainer(SLTrainer):
                         )
                     self.accumulative_meter.reset()
                 self.num_train_step += 1
-                
+
             if self.save_dir is not None and self.num_train_step > 0 and self.num_train_step % self.save_interval == 0:
                 # save checkpoint
                 self.coordinator.print_on_master("\nStart saving model checkpoint with running states")