diff --git a/configs/7B_sft.py b/configs/7B_sft.py
index c0a9bc8..88779c8 100644
--- a/configs/7B_sft.py
+++ b/configs/7B_sft.py
@@ -71,6 +71,7 @@ data = dict(
     valid_folder=VALID_FOLDER,
     empty_cache_and_diag_interval=200,
     diag_outlier_ratio=1.1,
+    valid_pack_mode=False,   # Used packed dataset to evaluation, default is False.
 )
 
 grad_scaler = dict(