fix possibly OOM error

src/utils/common.py

@@ -477,13 +477,13 @@ def preprocess_data(
             desc="Running tokenizer on dataset"
         )
 
-    if stage == "pt":
-        print_unsupervised_dataset_example(dataset[0])
-    elif stage == "sft":
-        print_supervised_dataset_example(dataset[0])
-    elif stage == "rm":
-        print_pairwise_dataset_example(dataset[0])
-    elif stage == "ppo":
-        print_unsupervised_dataset_example(dataset[0])
+        if stage == "pt":
+            print_unsupervised_dataset_example(dataset[0])
+        elif stage == "sft":
+            print_supervised_dataset_example(dataset[0])
+        elif stage == "rm":
+            print_pairwise_dataset_example(dataset[0])
+        elif stage == "ppo":
+            print_unsupervised_dataset_example(dataset[0])
 
-    return dataset
+        return dataset