diff --git a/core/preprocess/hwvideoframe/src/resize.cpp b/core/preprocess/hwvideoframe/src/resize.cpp
index cea00c95ada4941a470d0e1f1546d193395ba028..d75cf66c4cf50d244f2bda237ff942fcda122dd0 100644
--- a/core/preprocess/hwvideoframe/src/resize.cpp
+++ b/core/preprocess/hwvideoframe/src/resize.cpp
@@ -35,7 +35,8 @@ std::shared_ptr<OpContext> Resize::operator()(
       percent = static_cast<float>(_max_size) / static_cast<float>(im_max_size);
     }
     resized_width = static_cast<int>(round(input->nppi_size().width * percent));
-    resized_height = static_cast<int>(round(input->nppi_size().height * percent));
+    resized_height =
+        static_cast<int>(round(input->nppi_size().height * percent));
   }
   auto output = std::make_shared<OpContext>(resized_height, resized_width);
   auto ret = resize_linear(input->p_frame(),
diff --git a/core/preprocess/hwvideoframe/src/rgb_swap.cpp b/core/preprocess/hwvideoframe/src/rgb_swap.cpp
index 9d5a6d64abbbbab345b42134c1c5367fa52ff26f..a123a2323c5621c2875eec29254629f9fb12e35b 100644
--- a/core/preprocess/hwvideoframe/src/rgb_swap.cpp
+++ b/core/preprocess/hwvideoframe/src/rgb_swap.cpp
@@ -14,8 +14,8 @@
 
 #include <npp.h>
 
-#include "core/preprocess/hwvideoframe/include/utils.h"
 #include "core/preprocess/hwvideoframe/include/rgb_swap.h"
+#include "core/preprocess/hwvideoframe/include/utils.h"
 
 const int SwapChannel::_ORDER[CHANNEL_SIZE] = {2, 1, 0};
 
diff --git a/core/preprocess/nvdec-extractframe/include/ExtractFrameJpeg.h b/core/preprocess/nvdec-extractframe/include/ExtractFrameJpeg.h
index 6543bf096882114bb532d631a84d363238e81917..31c98444f9f7f3cbfeeebed98239680c2f34b1fc 100644
--- a/core/preprocess/nvdec-extractframe/include/ExtractFrameJpeg.h
+++ b/core/preprocess/nvdec-extractframe/include/ExtractFrameJpeg.h
@@ -82,7 +82,7 @@ class ExtractFrameJpeg : public ExtractFrameBase {
   int jpeg_encode(uint8_t* p_image,
                   int width,
                   int height,
-                  FrameResult &result);
+                  const FrameResult& result);
   nvjpegHandle_t _nv_jpeg_handler;
   nvjpegEncoderState_t _nv_enc_state;
   nvjpegEncoderParams_t _nv_enc_params;
diff --git a/python/paddle_serving_app/reader/test_preprocess.py b/python/paddle_serving_app/reader/test_preprocess.py
index a487cc05306f320be37bd3893f99a727d43b73ad..82830b1da65db2da3fcb256f5187ad67ad24a0c0 100644
--- a/python/paddle_serving_app/reader/test_preprocess.py
+++ b/python/paddle_serving_app/reader/test_preprocess.py
@@ -21,6 +21,7 @@ from paddle_serving_app.reader import Sequential, Resize, File2Image
 import libgpupreprocess as pp
 import libhwextract
 
+
 class TestOperators(unittest.TestCase):
     """
     test all operators, e.g. Div, Normalize
@@ -172,5 +173,6 @@ class TestOperators(unittest.TestCase):
             item.free_memory()
             # have to release memor
 
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/python/paddle_serving_app/utils/__init__.py b/python/paddle_serving_app/utils/__init__.py
index 56551b939a509fbbe59d6ac8f49ad6955e139a81..d8e70508ecb76d149d145c1774d69c4b7e79338e 100644
--- a/python/paddle_serving_app/utils/__init__.py
+++ b/python/paddle_serving_app/utils/__init__.py
@@ -11,5 +11,6 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+# pylint: disable=doc-string-missing
 
-from .arr2image import Arr2Image
\ No newline at end of file
+from .arr2image import Arr2Image
diff --git a/python/setup.py.app.in b/python/setup.py.app.in
index 698f625d92a95231f03fa945ebeb03c233cc111e..9a17f0372fd3f3c626372bf3bdb1cc2f6a922772 100644
--- a/python/setup.py.app.in
+++ b/python/setup.py.app.in
@@ -40,13 +40,14 @@ max_version, mid_version, min_version = python_version()
 if '${PACK}' == 'ON':
     copy_lib()
 
-os.system('mkdir -p ./paddle_serving_app/reader/lib')
-os.system('cp -a -f ../core/preprocess/hwvideoframe/libgpupreprocess.so ./paddle_serving_app/reader')
-os.system('cp -a -f ../core/preprocess/nvdec-extractframe/libhwextract.so ./paddle_serving_app/reader')
-os.system('cp -a -f ../core/preprocess/hwvideoframe/cuda/libgpu.so ./paddle_serving_app/reader/lib')
-os.system('cp -a -f ../core/preprocess/nvdec-extractframe/cuda/libhwgpu.so ./paddle_serving_app/reader/lib')
-os.system('cp -a -f ../../core/preprocess/nvdec-extractframe/lib/* ./paddle_serving_app/reader/lib')
-os.system('export LD_LIBRARY_PATH="./paddle_serving_app/reader/lib"')
+if os.path.exists(../core/preprocess/hwvideoframe/libgpupreprocess.so):
+    os.system('mkdir ./paddle_serving_app/reader/lib')
+    os.system('cp ../core/preprocess/hwvideoframe/libgpupreprocess.so ./paddle_serving_app/reader')
+    os.system('cp ../core/preprocess/nvdec-extractframe/libhwextract.so ./paddle_serving_app/reader')
+    os.system('cp ../core/preprocess/hwvideoframe/cuda/libgpu.so ./paddle_serving_app/reader/lib')
+    os.system('cp ../core/preprocess/nvdec-extractframe/cuda/libhwgpu.so ./paddle_serving_app/reader/lib')
+    os.system('cp -a -i ../../core/preprocess/nvdec-extractframe/lib/* ./paddle_serving_app/reader/lib')
+    os.system('export LD_LIBRARY_PATH="./paddle_serving_app/reader/lib"')
 
 REQUIRED_PACKAGES = [
     'six >= 1.10.0', 'sentencepiece', 'opencv-python<=4.2.0.32', 'pillow',