TST Reduce time for test_mean_shift.py::test_parallel (scikit-learn#11162)

Author: qinhanmin2014

sklearn/cluster/tests/test_mean_shift.py

@@ -65,6 +65,10 @@ def test_estimate_bandwidth_with_sparse_matrix():
 
 
 def test_parallel():
+    centers = np.array([[1, 1], [-1, -1], [1, -1]]) + 10
+    X, _ = make_blobs(n_samples=50, n_features=2, centers=centers,
+                      cluster_std=0.4, shuffle=True, random_state=11)
+
     ms1 = MeanShift(n_jobs=2)
     ms1.fit(X)