diff --git a/paddle/fluid/operators/gather_test.cc b/paddle/fluid/operators/gather_test.cc
index 9c0561b016fdbfa8e48535eaa673a3f85bc936e5..f6b156eb30dae154395b34dcfc26319cd89edbca 100644
--- a/paddle/fluid/operators/gather_test.cc
+++ b/paddle/fluid/operators/gather_test.cc
@@ -43,7 +43,8 @@ TEST(Gather, GatherData) {
   auto* cpu_place = new paddle::platform::CPUPlace();
   paddle::platform::CPUDeviceContext ctx(*cpu_place);
   paddle::operators::CPUGather<int>(ctx, *src, *index, output);
-
+  delete cpu_place;
+  cpu_place = NULL;
   for (int i = 0; i < 4; ++i) EXPECT_EQ(p_output[i], i + 4);
   for (int i = 4; i < 8; ++i) EXPECT_EQ(p_output[i], i - 4);
 
diff --git a/paddle/fluid/operators/math/math_function_test.cc b/paddle/fluid/operators/math/math_function_test.cc
index 3719a264e90ea7d1a99eb9589ce4fd0d8e074781..b545671b43d3a453ab03e4774427179617f62db0 100644
--- a/paddle/fluid/operators/math/math_function_test.cc
+++ b/paddle/fluid/operators/math/math_function_test.cc
@@ -77,6 +77,8 @@ TEST(math_function, gemm_trans_clbas) {
   paddle::platform::CPUDeviceContext context(*cpu_place);
   GetBlas<float>(context).GEMM(false, true, m, n, k, 1, input1_ptr, 3,
                                input2_ptr + 3, 3, 1, input3_ptr + 1, 4);
+  delete cpu_place;
+  cpu_place = NULL;
 
   EXPECT_EQ(input3_ptr[0], 0);
   EXPECT_EQ(input3_ptr[1], 24);
diff --git a/python/paddle/fluid/layers/metric.py b/python/paddle/fluid/layers/metric.py
index cab2eb55510542bdd4dd7eca7667601697759181..a1c64ce2771526cbd0baa944f97d01e7878b3ac1 100644
--- a/python/paddle/fluid/layers/metric.py
+++ b/python/paddle/fluid/layers/metric.py
@@ -64,10 +64,6 @@ def auc(input, label, curve='ROC', num_thresholds=200):
     topk_indices = helper.create_tmp_variable(dtype="int64")
     topk_out, topk_indices = nn.topk(input, k=k)
     auc_out = helper.create_tmp_variable(dtype="float32")
-    if correct is None:
-        correct = helper.create_tmp_variable(dtype="int64")
-    if total is None:
-        total = helper.create_tmp_variable(dtype="int64")
     helper.append_op(
         type="accuracy",
         inputs={
diff --git a/python/paddle/fluid/tests/unittests/test_dynrnn_gradient_check.py b/python/paddle/fluid/tests/unittests/test_dynrnn_gradient_check.py
index 22329390754d8d010dced0d1aca35617140cd097..95af51f1b2f8cd9492baa9cb14fe31ffa586f2fc 100644
--- a/python/paddle/fluid/tests/unittests/test_dynrnn_gradient_check.py
+++ b/python/paddle/fluid/tests/unittests/test_dynrnn_gradient_check.py
@@ -30,9 +30,6 @@ class Memory(object):
         assert val.dtype == self.ex.dtype
         self.cur = val
 
-    def ex(self):
-        return self.ex
-
     def next(self):
         self.ex = self.cur
         self.cur = None