diff --git a/paddle/fluid/distributed/ps/service/simple_rpc/baidu_rpc_server.cc b/paddle/fluid/distributed/ps/service/simple_rpc/baidu_rpc_server.cc
index 99cadfc185ac261b5ae909f594cbca4d7f39fb2e..f3e501dd00ce1b127955d984a997c3334a51466d 100644
--- a/paddle/fluid/distributed/ps/service/simple_rpc/baidu_rpc_server.cc
+++ b/paddle/fluid/distributed/ps/service/simple_rpc/baidu_rpc_server.cc
@@ -110,7 +110,7 @@ class BRpcServiceImpl : public SimpleRpcService {
       delete head.request;
       PADDLE_ENFORCE_NE(
           head.service,
-          0,
+          nullptr,
           phi::errors::PreconditionNotMet("Service should not be nullptr."));
       head.service->decrease_request();
     } else {
@@ -150,8 +150,9 @@ void BaiduRpcServer::initialize() {
     return;
   }
 
-  PADDLE_ENFORCE_NE(
-      _gloo, NULL, phi::errors::PreconditionNotMet("Gloo not allow nullptr."));
+  PADDLE_ENFORCE_NE(_gloo,
+                    nullptr,
+                    phi::errors::PreconditionNotMet("Gloo not allow nullptr."));
   _gloo->Barrier();
   _server->set_version(google::VersionString());
   brpc::ServerOptions option;
@@ -237,7 +238,7 @@ static void handle_baidu_rpc_response(brpc::Controller *cntl,
       delete head.request;
       PADDLE_ENFORCE_NE(
           head.service,
-          0,
+          nullptr,
           phi::errors::PreconditionNotMet("Service should not be nullptr."));
       head.service->decrease_request();
     } else {
diff --git a/python/paddle/fluid/tests/unittests/test_unzip_op.py b/python/paddle/fluid/tests/unittests/test_unzip_op.py
index 65a353822b12fbd185dce4e9e5bdbefcd2370e5a..71caac8c0f2f80ddce73c24e6e2d77e9ecb7395c 100644
--- a/python/paddle/fluid/tests/unittests/test_unzip_op.py
+++ b/python/paddle/fluid/tests/unittests/test_unzip_op.py
@@ -31,7 +31,7 @@ class TestUnzipOp(unittest.TestCase):
             place = fluid.CUDAPlace(0)
             x = fluid.data(name='X', shape=[3, 4], dtype='float64')
             lod = fluid.data(name='lod', shape=[11], dtype='int64')
-            output = paddle.incubate.unzip(x, lod)
+            output = paddle.incubate.operators.unzip(x, lod)
 
             input = [
                 [1.0, 2.0, 3.0, 4.0],
diff --git a/python/paddle/incubate/__init__.py b/python/paddle/incubate/__init__.py
index 69d4ca2b0c8ae5c7edb607c954a887bf256074e4..97dd8353be50c800e03e9ee947368241b49cf44e 100644
--- a/python/paddle/incubate/__init__.py
+++ b/python/paddle/incubate/__init__.py
@@ -23,7 +23,6 @@ from .operators import graph_send_recv
 from .operators import graph_khop_sampler
 from .operators import graph_sample_neighbors
 from .operators import graph_reindex
-from .operators import unzip
 from .tensor import segment_sum
 from .tensor import segment_mean
 from .tensor import segment_max
@@ -56,5 +55,4 @@ __all__ = [
     'segment_max',
     'segment_min',
     'identity_loss',
-    'unzip',
 ]