Mark test_xavier_uniform as slow (pytorch#124801)

takes 17+ minutes, sometimes 30+ min
Pull Request resolved: pytorch#124801
Approved by: https://github.com/huydhn

Author: clee2000

test/nn/test_init.py

@@ -14,6 +14,7 @@
     run_tests,
     skipIfNoLapack,
     skipIfTorchDynamo,
+    slowTest,
     TEST_SCIPY,
     TestCase,
 )
@@ -318,6 +319,7 @@ def test_xavier_normal_errors_on_inputs_smaller_than_2d(self):
                 init.xavier_normal_(tensor)
 
     @unittest.skipIf(not TEST_SCIPY, "Scipy not found.")
+    @slowTest
     def test_xavier_uniform(self):
         for use_gain in [True, False]:
             for dims in [2, 4]: