diff --git a/tests/test_datasets.py b/tests/test_datasets.py
index 5146b86c..837e3188 100644
--- a/tests/test_datasets.py
+++ b/tests/test_datasets.py
@@ -60,6 +60,9 @@ def test_compute_stats():
     for k, pattern in buffer.stats_patterns.items():
         expected_mean = einops.reduce(all_data[k], pattern, "mean")
         assert torch.allclose(computed_stats[k]["mean"], expected_mean)
-        assert torch.allclose(computed_stats[k]["std"], torch.sqrt(einops.reduce((all_data[k] - expected_mean) ** 2, pattern, "mean")))
+        assert torch.allclose(
+            computed_stats[k]["std"],
+            torch.sqrt(einops.reduce((all_data[k] - expected_mean) ** 2, pattern, "mean"))
+        )
         assert torch.allclose(computed_stats[k]["min"], einops.reduce(all_data[k], pattern, "min"))
         assert torch.allclose(computed_stats[k]["max"], einops.reduce(all_data[k], pattern, "max"))