diff --git a/library/train_util.py b/library/train_util.py
index 01fa6467..25870198 100644
--- a/library/train_util.py
+++ b/library/train_util.py
@@ -148,10 +148,11 @@ TEXT_ENCODER_OUTPUTS_CACHE_SUFFIX_SD3 = "_sd3_te.npz"
 
 def split_train_val(
     paths: List[str], 
+    sizes: List[Optional[Tuple[int, int]]],
     is_training_dataset: bool, 
     validation_split: float, 
     validation_seed: int | None
-) -> List[str]:
+) -> Tuple[List[str], List[Optional[Tuple[int, int]]]]:
     """
     Split the dataset into train and validation
 
@@ -160,22 +161,28 @@ def split_train_val(
     [0:80] = 80 training images
     [80:] = 20 validation images
     """
+    dataset = list(zip(paths, sizes))
     if validation_seed is not None:
         logging.info(f"Using validation seed: {validation_seed}")
         prevstate = random.getstate()
         random.seed(validation_seed)
-        random.shuffle(paths)
+        random.shuffle(dataset)
         random.setstate(prevstate)
     else:
-        random.shuffle(paths)
+        random.shuffle(dataset)
 
+    paths, sizes = zip(*dataset)
+    paths = list(paths)
+    sizes = list(sizes)
     # Split the dataset between training and validation
     if is_training_dataset:
         # Training dataset we split to the first part
-        return paths[0:math.ceil(len(paths) * (1 - validation_split))]
+        split = math.ceil(len(paths) * (1 - validation_split))
+        return paths[0:split], sizes[0:split]
     else:
         # Validation dataset we split to the second part
-        return paths[len(paths) - round(len(paths) * validation_split):]
+        split = len(paths) - round(len(paths) * validation_split)
+        return paths[split:], sizes[split:]
 
 
 class ImageInfo:
@@ -1931,12 +1938,12 @@ class DreamBoothDataset(BaseDataset):
                 with open(info_cache_file, "r", encoding="utf-8") as f:
                     metas = json.load(f)
                 img_paths = list(metas.keys())
-                sizes = [meta["resolution"] for meta in metas.values()]
+                sizes: List[Optional[Tuple[int, int]]] = [meta["resolution"] for meta in metas.values()]
 
                 # we may need to check image size and existence of image files, but it takes time, so user should check it before training
             else:
                 img_paths = glob_images(subset.image_dir, "*")
-                sizes = [None] * len(img_paths)
+                sizes: List[Optional[Tuple[int, int]]] = [None] * len(img_paths)
 
                 # new caching: get image size from cache files
                 strategy = LatentsCachingStrategy.get_strategy()
@@ -1969,7 +1976,7 @@ class DreamBoothDataset(BaseDataset):
                             w, h = None, None
 
                         if w is not None and h is not None:
-                            sizes[i] = [w, h]
+                            sizes[i] = (w, h)
                             size_set_count += 1
                     logger.info(f"set image size from cache files: {size_set_count}/{len(img_paths)}")
 
@@ -1987,11 +1994,13 @@ class DreamBoothDataset(BaseDataset):
                     # Skip any validation dataset for regularization images
                     if self.is_training_dataset is False:
                         img_paths = []
+                        sizes = []
                     # Otherwise the img_paths remain as original img_paths and no split 
                     # required for training images dataset of regularization images
                 else:
-                    img_paths = split_train_val(
+                    img_paths, sizes = split_train_val(
                         img_paths, 
+                        sizes,
                         self.is_training_dataset, 
                         self.validation_split, 
                         self.validation_seed
diff --git a/tests/test_validation.py b/tests/test_validation.py
new file mode 100644
index 00000000..f80686d8
--- /dev/null
+++ b/tests/test_validation.py
@@ -0,0 +1,17 @@
+from library.train_util import split_train_val
+
+
+def test_split_train_val():
+    paths = ["path1", "path2", "path3", "path4", "path5", "path6", "path7"]
+    sizes = [(1, 1), (2, 2), None, (4, 4), (5, 5), (6, 6), None]
+    result_paths, result_sizes = split_train_val(paths, sizes, True, 0.2, 1234)
+    assert result_paths == ["path2", "path3", "path6", "path5", "path1", "path4"], result_paths
+    assert result_sizes == [(2, 2), None, (6, 6), (5, 5), (1, 1), (4, 4)], result_sizes
+
+    result_paths, result_sizes = split_train_val(paths, sizes, False, 0.2, 1234)
+    assert result_paths == ["path7"], result_paths
+    assert result_sizes == [None], result_sizes
+
+
+if __name__ == "__main__":
+    test_split_train_val()
diff --git a/train_network.py b/train_network.py
index fe664442..47c4bb56 100644
--- a/train_network.py
+++ b/train_network.py
@@ -1557,7 +1557,7 @@ class NetworkTrainer:
 
                 if is_tracking:
                     avr_loss: float = val_epoch_loss_recorder.moving_average
-                    loss_validation_divergence = val_epoch_loss_recorder.moving_average - avr_loss 
+                    loss_validation_divergence = val_epoch_loss_recorder.moving_average - loss_recorder.moving_average 
                     logs = {
                         "loss/validation/epoch_average": avr_loss,
                         "loss/validation/epoch_divergence": loss_validation_divergence,