diff --git a/kraken/lib/train/segmentation.py b/kraken/lib/train/segmentation.py
index 6325e7b7c..dcb9d8764 100644
--- a/kraken/lib/train/segmentation.py
+++ b/kraken/lib/train/segmentation.py
@@ -31,6 +31,7 @@
 from scipy.optimize import linear_sum_assignment
 from torch.utils.data import DataLoader, Subset, random_split
 from lightning.pytorch.callbacks import EarlyStopping
+from torchmetrics.aggregation import MeanMetric
 from torchmetrics.classification import (MultilabelAccuracy,
                                          MultilabelJaccardIndex)
 
@@ -278,10 +279,10 @@ def validation_step(self, batch, batch_idx):
                     costs = np.sort(costs)[:len(y_curves[line_cls][0])]
                     penalty = np.full(diff, 8.0)
                     costs = np.concatenate([costs, penalty])
-                self.val_line_dist.update(costs/8.0)
+                self.val_line_mean_dist.update(costs/8.0)
             # no line output
             else:
-                self.val_line_dist.update(torch.ones(len(y_curves[line_cls][0])))
+                self.val_line_mean_dist.update(torch.ones(len(y_curves[line_cls][0])))
 
     def on_validation_epoch_end(self):
         if not self.trainer.sanity_checking:
@@ -289,7 +290,7 @@ def on_validation_epoch_end(self):
             mean_accuracy = self.val_region_mean_accuracy.compute()
             mean_iu = self.val_region_mean_iu.compute()
             freq_iu = self.val_region_freq_iu.compute()
-            mean_line_dist = self.val_line_dist.compute()
+            line_mean_dist = self.val_line_mean_dist.compute()
 
             if mean_iu > self.best_metric:
                 logger.debug(f'Updating best region metric from {self.best_metric} ({self.best_epoch}) to {mean_iu} ({self.current_epoch})')
@@ -302,7 +303,7 @@ def on_validation_epoch_end(self):
             self.log('val_region_mean_acc', mean_accuracy, on_step=False, on_epoch=True, prog_bar=True, logger=True)
             self.log('val_region_mean_iu', mean_iu, on_step=False, on_epoch=True, prog_bar=True, logger=True)
             self.log('val_region_freq_iu', freq_iu, on_step=False, on_epoch=True, prog_bar=True, logger=True)
-            self.log('val_mean_line_dist', mean_line_dist, on_step=False, on_epoch=True, prog_bar=True, logger=True)
+            self.log('val_line_mean_dist', line_mean_dist, on_step=False, on_epoch=True, prog_bar=True, logger=True)
             self.log('val_metric', mean_iu, on_step=False, on_epoch=True, prog_bar=False, logger=True)
 
         # reset metrics even if sanity checking
@@ -432,7 +433,8 @@ def setup(self, stage: Optional[str] = None):
             torch.set_num_threads(max(self.num_workers, 1))
 
             # set up validation metrics after output classes have been determined
-            # baseline metrics
+            # baseline metric
+            self.val_line_mean_dist = MeanMetric()
             # region metrics
             num_regions = len(self.val_set.dataset.class_mapping['regions'])
             self.val_region_px_accuracy = MultilabelAccuracy(average='micro', num_labels=num_regions)