diff --git a/tools/program.py b/tools/program.py
index 333e8ed97..1dfd06af8 100755
--- a/tools/program.py
+++ b/tools/program.py
@@ -266,7 +266,7 @@ def train(config,
             stats['lr'] = lr
             train_stats.update(stats)
 
-            if cal_metric_during_train:  # only rec and cls need
+            if cal_metric_during_train  and model_type is not "det":  # only rec and cls need
                 batch = [item.numpy() for item in batch]
                 if model_type in ['table', 'kie']:
                     eval_class(preds, batch)