fix timeout test=develop (#25412)

python/paddle/fluid/tests/unittests/dygraph_to_static/test_lac.py

@@ -513,13 +513,8 @@ class TestLACModel(unittest.TestCase):
         return out
 
     def test_train(self):
-        # TODO(Aurelius84): The unittest will hang sometimes under command "ctest" 
-        # on Windows platform, which means it failed to start up this unittest. 
-        # So the unittest raised timeout.
-        if os.name == 'nt':
-            return
-        dy_out = self.train(to_static=False)
         st_out = self.train(to_static=True)
+        dy_out = self.train(to_static=False)
         self.assertTrue(
             np.allclose(dy_out, st_out),
             msg="dygraph output:\n{},\nstatic output:\n {}.".format(dy_out,