scikit-learn
diff --git a/‎sklearn/tree/tests/test_tree.flac b/‎sklearn/tree/tests/test_tree.flac
diff --git a/‎sklearn/tree/tests/test_tree.py
Lines changed: 5 additions & 3 deletions b/‎sklearn/tree/tests/test_tree.py
Lines changed: 5 additions & 3 deletions
@@ -1619,10 +1619,12 @@ def test_criterion_copy():
     # Let's check whether copy of our criterion has the same type
     # and properties as original
     n_outputs = 3
-    n_classes = np.arange(3)
+    n_classes = np.arange(3, dtype=np.intp)
     n_samples = 100
-    pickle_copy = lambda obj: pickle.loads(pickle.dumps(obj))
-    for copy_func in [copy.copy, copy.deepcopy, pickle_copy]:
+
+    def _pickle_copy(obj):
+        return pickle.loads(pickle.dumps(obj))
+    for copy_func in [copy.copy, copy.deepcopy, _pickle_copy]:
         for _, typename in CRITERIA_CLF.items():
             criteria = typename(n_outputs, n_classes)
             result = copy_func(criteria).__reduce__()