diff --git a/modules/deeplearning/unet_l1b_l2.py b/modules/deeplearning/unet_l1b_l2.py
index e4a025a6c46df0d6bdb20e2baf34ea8352d9d57f..f646066948a393868f4aee4cf66586d18d608c8a 100644
--- a/modules/deeplearning/unet_l1b_l2.py
+++ b/modules/deeplearning/unet_l1b_l2.py
@@ -384,7 +384,7 @@ class UNET:
         self.get_train_dataset(trn_idxs)
         self.get_test_dataset(tst_idxs)
 
-        self.num_data_samples = 56000  # approximately
+        self.num_data_samples = 34000  # approximately
 
         print('datetime: ', now)
         print('training and test data: ')