Fix test_weight_decay_extend random failed on windows (#28643)

* add debuging code

* change seed & add debug message

python/paddle/fluid/contrib/tests/test_weight_decay_extend.py

@@ -24,6 +24,8 @@ import contextlib
 
 paddle.enable_static()
 
+SEED = 2020
+
 
 def fake_imdb_reader(word_dict_size,
                      sample_num,
@@ -87,6 +89,11 @@ def bow_net(data,
 
 class TestWeightDecay(unittest.TestCase):
     def setUp(self):
+        # set seed
+        np.random.seed(SEED)
+        paddle.seed(SEED)
+        paddle.framework.random._manual_program_seed(SEED)
+        # configs
         self.word_dict_len = 5147
         batch_size = 2
         reader = fake_imdb_reader(self.word_dict_len, batch_size * 100)
@@ -114,8 +121,6 @@ class TestWeightDecay(unittest.TestCase):
         return param_sum
 
     def check_weight_decay(self, place, model):
-        paddle.seed(1)
-        paddle.framework.random._manual_program_seed(1)
         main_prog = fluid.framework.Program()
         startup_prog = fluid.framework.Program()
 
@@ -137,8 +142,6 @@ class TestWeightDecay(unittest.TestCase):
         return param_sum
 
     def check_weight_decay2(self, place, model):
-        paddle.seed(1)
-        paddle.framework.random._manual_program_seed(1)
         main_prog = fluid.framework.Program()
         startup_prog = fluid.framework.Program()
 
@@ -173,7 +176,12 @@ class TestWeightDecay(unittest.TestCase):
             param_sum2 = self.check_weight_decay2(place, model)
 
             for i in range(len(param_sum1)):
-                assert np.isclose(a=param_sum1[i], b=param_sum2[i], rtol=5e-5)
+                self.assertTrue(
+                    np.allclose(param_sum1[i], param_sum2[i]),
+                    "Current place: {}, i: {}, sum1: {}, sum2: {}".format(
+                        place, i, param_sum1[i][~np.isclose(param_sum1[
+                            i], param_sum2[i])], param_sum2[i][~np.isclose(
+                                param_sum1[i], param_sum2[i])]))
 
 
 if __name__ == '__main__':