diff --git a/codes/data/single_image_dataset.py b/codes/data/single_image_dataset.py
index d1a15f7e..3bf5b0cb 100644
--- a/codes/data/single_image_dataset.py
+++ b/codes/data/single_image_dataset.py
@@ -11,6 +11,12 @@ class SingleImageDataset(BaseUnsupervisedImageDataset):
     def __init__(self, opt):
         super(SingleImageDataset, self).__init__(opt)
 
+    def get_paths(self):
+        for i in range(len(self)):
+            chunk_ind = bisect_left(self.starting_indices, i)
+            chunk_ind = chunk_ind if chunk_ind < len(self.starting_indices) and self.starting_indices[chunk_ind] == i else chunk_ind-1
+            yield self.chunks[chunk_ind].tiles[i-self.starting_indices[chunk_ind]]
+
     def __getitem__(self, item):
         chunk_ind = bisect_left(self.starting_indices, item)
         chunk_ind = chunk_ind if chunk_ind < len(self.starting_indices) and self.starting_indices[chunk_ind] == item else chunk_ind-1
diff --git a/codes/data_scripts/validate_data.py b/codes/data_scripts/validate_data.py
index 4bb2fe04..9789d7bc 100644
--- a/codes/data_scripts/validate_data.py
+++ b/codes/data_scripts/validate_data.py
@@ -15,7 +15,7 @@ from skimage import io
 def main():
     #### options
     parser = argparse.ArgumentParser()
-    parser.add_argument('-opt', type=str, help='Path to option YAML file.', default='../../options/train_feature_net.yml')
+    parser.add_argument('-opt', type=str, help='Path to option YAML file.', default='../../options/train_exd_imgset_spsr7.yml')
     parser.add_argument('--launcher', choices=['none', 'pytorch'], default='none',
                         help='job launcher')
     parser.add_argument('--local_rank', type=int, default=0)
@@ -52,7 +52,7 @@ def main():
                     len(train_set), train_size))
     assert train_loader is not None
 
-    tq_ldr = tqdm(train_set.paths_GT)
+    tq_ldr = tqdm(train_set.get_paths())
     for path in tq_ldr:
         try:
             _ = io.imread(path)