MAINT fix scipy-dev tests by passing 1d vector to unique (#28137)

glemaitre · lesteve · web-flow · commit 4c0b9c4e1d8f · 2024-01-17T07:40:14.000Z
Co-authored-by: Loïc Estève &lt;loic.esteve@ymail.com&gt;
diff --git a/sklearn/datasets/tests/test_samples_generator.py b/sklearn/datasets/tests/test_samples_generator.py
@@ -136,7 +136,7 @@ def test_make_classification_informative_features():
 
             # Cluster by sign, viewed as strings to allow uniquing
             signs = np.sign(X)
-            signs = signs.view(dtype="|S{0}".format(signs.strides[0]))
+            signs = signs.view(dtype="|S{0}".format(signs.strides[0])).ravel()
             unique_signs, cluster_index = np.unique(signs, return_inverse=True)
 
             assert (
