diff --git a/metrics/confusion_matrix/confusion_matrix.py b/metrics/confusion_matrix/confusion_matrix.py
index 195254f4..0c2ebc3b 100644
--- a/metrics/confusion_matrix/confusion_matrix.py
+++ b/metrics/confusion_matrix/confusion_matrix.py
@@ -85,14 +85,21 @@ def _info(self):
                     "references": datasets.Value("int32"),
                 }
             ),
-            reference_urls=["https://scikit-learn.org/stable/modules/generated/sklearn.metrics.confusion_matrix.html", "https://scikit-learn.org/stable/modules/generated/sklearn.metrics.multilabel_confusion_matrix.html"],
+            reference_urls=[
+                "https://scikit-learn.org/stable/modules/generated/sklearn.metrics.confusion_matrix.html",
+                "https://scikit-learn.org/stable/modules/generated/sklearn.metrics.multilabel_confusion_matrix.html",
+            ],
         )
 
     def _compute(self, predictions, references, labels=None, sample_weight=None, normalize=None):
         if self.config_name == "multilabel":
             return {
                 "confusion_matrix": multilabel_confusion_matrix(
-                    references, predictions, sample_weight=sample_weight, labels=labels, samplewise=normalize == "samplewise"
+                    references,
+                    predictions,
+                    sample_weight=sample_weight,
+                    labels=labels,
+                    samplewise=normalize == "samplewise",
                 ),
             }
         return {
@@ -100,4 +107,3 @@ def _compute(self, predictions, references, labels=None, sample_weight=None, nor
                 references, predictions, labels=labels, sample_weight=sample_weight, normalize=normalize
             ),
         }
-