diff --git a/train.py b/train.py
index 1b1975e0..6987bdc6 100644
--- a/train.py
+++ b/train.py
@@ -204,7 +204,8 @@ def train():
     model.nc = nc  # attach number of classes to model
     model.arc = opt.arc  # attach yolo architecture
     model.hyp = hyp  # attach hyperparameters to model
-    model.class_weights = labels_to_class_weights(dataset.labels, nc).to(device)  # attach class weights
+    if hasattr(dataset, 'labels'):
+        model.class_weights = labels_to_class_weights(dataset.labels, nc).to(device)  # attach class weights
     torch_utils.model_info(model, report='summary')  # 'full' or 'summary'
     nb = len(dataloader)
     maps = np.zeros(nc)  # mAP per class