Fix style checks

Signed-off-by: Beat Buesser <[email protected]>

Author: Beat Buesser

art/utils.py

@@ -546,10 +546,10 @@ def random_sphere(
                 "The parameter `radius` of type `np.ndarray` is not supported to use with norm 1."
             )
 
-        u = np.random.uniform(size=(nb_points, nb_dims))
-        v = np.sort(u)
-        v_pre = np.concatenate((np.zeros((nb_points, 1)), v[:, :nb_dims-1]), axis=-1)
-        x = v - v_pre
+        var_u = np.random.uniform(size=(nb_points, nb_dims))
+        var_v = np.sort(var_u)
+        v_pre = np.concatenate((np.zeros((nb_points, 1)), var_v[:, : nb_dims - 1]), axis=-1)
+        x = var_v - v_pre
         res = radius * x * np.random.choice([-1, 1], (nb_points, nb_dims))
 
     elif norm == 2:

tests/test_utils.py

@@ -179,7 +179,6 @@ def test_random_sphere(self):
         x = random_sphere(1, 10000, 1, np.inf)
         self.assertTrue(np.abs(np.max(np.abs(x), axis=1) - 1.0) < 1e-2)
 
-
     def test_to_categorical(self):
         y = np.array([3, 1, 4, 1, 5, 9])
         y_ = to_categorical(y)