diff --git a/doc/COMPILE.md b/doc/COMPILE.md
index 84b1b65cbdbb0dcf6079d30bd7ebc9baf4a8c6e1..1836f4fe089f13e2eb2c9485f40d50ec668e4671 100644
--- a/doc/COMPILE.md
+++ b/doc/COMPILE.md
@@ -23,7 +23,7 @@
 |           libXext            |                            1.3.3                             |
 |            libSM             |                            1.2.2                             |
 |          libXrender          |                            0.9.10                            |
-|          python-whl          | numpy>=1.12, <=1.16.4<br/>google>=2.0.3<br/>protobuf>=3.12.2<br/>grpcio-tools>=1.28.1<br/>grpcio>=1.28.1<br/>func-timeout>=4.3.5<br/>pyyaml>=1.3.0<br/>sentencepiece==0.1.92<br>flask>=1.1.2<br>ujson>=2.0.3 |
+|          python-whl          | numpy>=1.12, <=1.16.4<br/>wheel>=0.34.0, <0.35.0<br/>setuptools>=44.1.0<br/>opencv-python==4.2.0.32<br/>google>=2.0.3<br/>protobuf>=3.12.2<br/>grpcio-tools>=1.28.1<br/>grpcio>=1.28.1<br/>func-timeout>=4.3.5<br/>pyyaml>=1.3.0<br/>sentencepiece==0.1.92<br>flask>=1.1.2<br>ujson>=2.0.3 |
 
 It is recommended to use Docker for compilation. We have prepared the Paddle Serving compilation environment for you, see [this document](DOCKER_IMAGES.md).
 
diff --git a/doc/COMPILE_CN.md b/doc/COMPILE_CN.md
index a38faff4289a4946d82f8b4a71afd521c7cd48fd..1235653e69161ba8f71d3f8098a1860dca4d357d 100644
--- a/doc/COMPILE_CN.md
+++ b/doc/COMPILE_CN.md
@@ -23,7 +23,7 @@
 |           libXext            |                            1.3.3                             |
 |            libSM             |                            1.2.2                             |
 |          libXrender          |                            0.9.10                            |
-|          python-whl          | numpy>=1.12, <=1.16.4<br/>google>=2.0.3<br/>protobuf>=3.12.2<br/>grpcio-tools>=1.28.1<br/>grpcio>=1.28.1<br/>func-timeout>=4.3.5<br/>pyyaml>=1.3.0<br/>sentencepiece==0.1.92<br/>flask>=1.1.2<br/>ujson>=2.0.3 |
+|          python-whl          | numpy>=1.12, <=1.16.4<br/>wheel>=0.34.0, <0.35.0<br/>setuptools>=44.1.0<br/>opencv-python==4.2.0.32<br/>google>=2.0.3<br/>protobuf>=3.12.2<br/>grpcio-tools>=1.28.1<br/>grpcio>=1.28.1<br/>func-timeout>=4.3.5<br/>pyyaml>=1.3.0<br/>sentencepiece==0.1.92<br/>flask>=1.1.2<br/>ujson>=2.0.3 |
 
 推荐使用Docker编译，我们已经为您准备好了Paddle Serving编译环境，详见[该文档](DOCKER_IMAGES_CN.md)。
 
diff --git a/python/examples/ocr/README.md b/python/examples/ocr/README.md
index ca9bbabdf57ce95763b25fec3751a85e4c8f9401..a0fc9f60160506183076233f33face1732a278c7 100644
--- a/python/examples/ocr/README.md
+++ b/python/examples/ocr/README.md
@@ -21,8 +21,13 @@ tar xf test_imgs.tar
 ### Start Service
 
 ```
+#choose one of cpu/gpu commands as following
+#for cpu user
+python -m paddle_serving_server.serve --model ocr_det_model --port 9293
+python ocr_web_server.py cpu
+#for gpu user
 python -m paddle_serving_server_gpu.serve --model ocr_det_model --port 9293 --gpu_id 0
-python ocr_web_server.py
+python ocr_web_server.py gpu
 ```
 
 ### Client Prediction
@@ -33,7 +38,11 @@ If you want a faster web service, please try Web Debugger Service
 
 ## Web Debugger Service
 ```
-python ocr_debugger_server.py
+#choose one of cpu/gpu commands as following
+#for cpu user
+python ocr_debugger_server.py cpu
+#for gpu user
+python ocr_debugger_server.py gpu 
 ```
 
 ## Web Debugger Client Prediction
@@ -54,15 +63,17 @@ Dataset: RCTW 500 sample images
 | Serving web service          | 8.69         | 13.41                      | 109.97           | 2.82               | 87.76            | 4.29               | 3.98               | 78.51            | 3.66               | 4.12                     | 181.02             | 136.49       | 317.51        |
 | Serving Debugger web service |  8.73        | 16.42                      | 115.27           | 2.93               | 20.63            | 3.97               | 4.48               | 13.84            | 3.60               | 6.91                     | 49.45              | 147.33       | 196.78        |
 
-## Appendix: Det or Rec only
+## Appendix: For Users who want to launch Det or Rec only
 if you are going to detect images not recognize it or directly recognize the words from images. We also provide Det and Rec server for you.
 
 ### Det Server 
 
 ```
-python det_web_server.py 
+python det_web_server.py cpu #for cpu user
+python det_web_server.py gpu #for gpu user
 #or
-python det_debugger_server.py
+python det_debugger_server.py cpu #for cpu user
+python det_debugger_server.py gpu #for gpu user
 ```
 
 ### Det Client
@@ -75,9 +86,11 @@ python ocr_web_client.py
 ### Rec Server
 
 ```
-python rec_web_server.py 
+python rec_web_server.py cpu #for cpu user
+python rec_web_server.py gpu #for gpu user
 #or
-python rec_debugger_server.py
+python rec_debugger_server.py cpu #for cpu user
+python rec_debugger_server.py gpu #for gpu user
 ```
 
 ### Rec Client
diff --git a/python/examples/ocr/README_CN.md b/python/examples/ocr/README_CN.md
index 65bc066a43a34d1a35cb4236473c571106c5f61b..8bdc45cf8e390b378708fbee2dbfe318132aea44 100644
--- a/python/examples/ocr/README_CN.md
+++ b/python/examples/ocr/README_CN.md
@@ -15,19 +15,18 @@ wget --no-check-certificate https://paddle-serving.bj.bcebos.com/ocr/test_imgs.t
 tar xf test_imgs.tar
 ```
 
-### 客户端预测
-
-```
-python ocr_rpc_client.py
-```
-
 ## Web Service服务
 
 ### 启动服务
 
 ```
+#根据CPU/GPU设备选择一种启动方式
+#for cpu user
+python -m paddle_serving_server.serve --model ocr_det_model --port 9293
+python ocr_web_server.py cpu
+#for gpu user
 python -m paddle_serving_server_gpu.serve --model ocr_det_model --port 9293 --gpu_id 0
-python ocr_web_server.py
+python ocr_web_server.py gpu
 ```
 
 ### 启动客户端
@@ -38,7 +37,11 @@ python ocr_web_client.py
 如果用户需要更快的执行速度，请尝试Debugger版Web服务
 ## 启动Debugger版Web服务
 ```
-python ocr_debugger_server.py
+#根据CPU/GPU设备选择一种启动方式
+#for cpu user
+python ocr_debugger_server.py cpu
+#for gpu user
+python ocr_debugger_server.py gpu
 ```
 
 ## 启动客户端
@@ -66,9 +69,11 @@ GPU: Nvidia Tesla V100单卡
 ### 启动检测服务
 
 ```
-python det_web_server.py 
+python det_web_server.py cpu #for cpu user
+python det_web_server.py gpu #for gpu user
 #or
-python det_debugger_server.py
+python det_debugger_server.py cpu #for cpu user
+python det_debugger_server.py gpu #for gpu user
 ```
 
 ### 检测服务客户端
@@ -81,9 +86,11 @@ python ocr_web_client.py
 ### 启动识别服务
 
 ```
-python rec_web_server.py 
+python rec_web_server.py cpu #for cpu user
+python rec_web_server.py gpu #for gpu user
 #or
-python rec_debugger_server.py
+python rec_debugger_server.py cpu #for cpu user
+python rec_debugger_server.py gpu #for gpu user
 ```
 
 ### 识别服务客户端
diff --git a/python/examples/ocr/det_debugger_server.py b/python/examples/ocr/det_debugger_server.py
index acfccdb6d24a7e1ba490705dd147f21dbf921d31..913a0bb4c9a099cbef886beb3889337d024d10d6 100644
--- a/python/examples/ocr/det_debugger_server.py
+++ b/python/examples/ocr/det_debugger_server.py
@@ -21,7 +21,10 @@ from paddle_serving_client import Client
 from paddle_serving_app.reader import Sequential, ResizeByFactor
 from paddle_serving_app.reader import Div, Normalize, Transpose
 from paddle_serving_app.reader import DBPostProcess, FilterBoxes
-from paddle_serving_server_gpu.web_service import WebService
+if sys.argv[1] == 'gpu':
+    from paddle_serving_server_gpu.web_service import WebService
+elif sys.argv[1] == 'cpu':
+    from paddle_serving_server.web_service import WebService
 import time
 import re
 import base64
@@ -64,8 +67,12 @@ class OCRService(WebService):
 
 ocr_service = OCRService(name="ocr")
 ocr_service.load_model_config("ocr_det_model")
-ocr_service.set_gpus("0")
-ocr_service.prepare_server(workdir="workdir", port=9292, device="gpu", gpuid=0)
+if sys.argv[1] == 'gpu':
+    ocr_service.set_gpus("0")
+    ocr_service.prepare_server(
+        workdir="workdir", port=9292, device="gpu", gpuid=0)
+elif sys.argv[1] == 'cpu':
+    ocr_service.prepare_server(workdir="workdir", port=9292)
 ocr_service.init_det()
 ocr_service.run_debugger_service()
 ocr_service.run_web_service()
diff --git a/python/examples/ocr/det_web_server.py b/python/examples/ocr/det_web_server.py
index dd69be0c70eb0f4dd627aa47ad33045a204f78c0..38c6541c70e9871d13dd81751d4edb2bc771a904 100644
--- a/python/examples/ocr/det_web_server.py
+++ b/python/examples/ocr/det_web_server.py
@@ -21,7 +21,10 @@ from paddle_serving_client import Client
 from paddle_serving_app.reader import Sequential, ResizeByFactor
 from paddle_serving_app.reader import Div, Normalize, Transpose
 from paddle_serving_app.reader import DBPostProcess, FilterBoxes
-from paddle_serving_server_gpu.web_service import WebService
+if sys.argv[1] == 'gpu':
+    from paddle_serving_server_gpu.web_service import WebService
+elif sys.argv[1] == 'cpu':
+    from paddle_serving_server.web_service import WebService
 import time
 import re
 import base64
@@ -65,8 +68,12 @@ class OCRService(WebService):
 
 ocr_service = OCRService(name="ocr")
 ocr_service.load_model_config("ocr_det_model")
-ocr_service.set_gpus("0")
-ocr_service.prepare_server(workdir="workdir", port=9292, device="gpu", gpuid=0)
+if sys.argv[1] == 'gpu':
+    ocr_service.set_gpus("0")
+    ocr_service.prepare_server(
+        workdir="workdir", port=9292, device="gpu", gpuid=0)
+elif sys.argv[1] == 'cpu':
+    ocr_service.prepare_server(workdir="workdir", port=9292, device="cpu")
 ocr_service.init_det()
 ocr_service.run_rpc_service()
 ocr_service.run_web_service()
diff --git a/python/examples/ocr/ocr_debugger_server.py b/python/examples/ocr/ocr_debugger_server.py
index 93e2d7a3d1dc64451774ecf790c2ebd3b39f1d91..f7458c3036734e4bb6e554097029270e11912a3a 100644
--- a/python/examples/ocr/ocr_debugger_server.py
+++ b/python/examples/ocr/ocr_debugger_server.py
@@ -22,7 +22,10 @@ from paddle_serving_client import Client
 from paddle_serving_app.reader import Sequential, URL2Image, ResizeByFactor
 from paddle_serving_app.reader import Div, Normalize, Transpose
 from paddle_serving_app.reader import DBPostProcess, FilterBoxes, GetRotateCropImage, SortedBoxes
-from paddle_serving_server_gpu.web_service import WebService
+if sys.argv[1] == 'gpu':
+    from paddle_serving_server_gpu.web_service import WebService
+elif sys.argv[1] == 'cpu':
+    from paddle_serving_server.web_service import WebService
 from paddle_serving_app.local_predict import Debugger
 import time
 import re
@@ -37,8 +40,12 @@ class OCRService(WebService):
                 (2, 0, 1))
         ])
         self.det_client = Debugger()
-        self.det_client.load_model_config(
-            det_model_config, gpu=True, profile=False)
+        if sys.argv[1] == 'gpu':
+            self.det_client.load_model_config(
+                det_model_config, gpu=True, profile=False)
+        elif sys.argv[1] == 'cpu':
+            self.det_client.load_model_config(
+                det_model_config, gpu=False, profile=False)
         self.ocr_reader = OCRReader()
 
     def preprocess(self, feed=[], fetch=[]):
@@ -99,5 +106,8 @@ ocr_service = OCRService(name="ocr")
 ocr_service.load_model_config("ocr_rec_model")
 ocr_service.prepare_server(workdir="workdir", port=9292)
 ocr_service.init_det_debugger(det_model_config="ocr_det_model")
-ocr_service.run_debugger_service(gpu=True)
+if sys.argv[1] == 'gpu':
+    ocr_service.run_debugger_service(gpu=True)
+elif sys.argv[1] == 'cpu':
+    ocr_service.run_debugger_service()
 ocr_service.run_web_service()
diff --git a/python/examples/ocr/ocr_web_server.py b/python/examples/ocr/ocr_web_server.py
index d017f6b9b560dc82158641b9f3a9f80137b40716..de83ca94a4c1f55d886175d9a87b6a34db34c2a5 100644
--- a/python/examples/ocr/ocr_web_server.py
+++ b/python/examples/ocr/ocr_web_server.py
@@ -22,7 +22,10 @@ from paddle_serving_client import Client
 from paddle_serving_app.reader import Sequential, URL2Image, ResizeByFactor
 from paddle_serving_app.reader import Div, Normalize, Transpose
 from paddle_serving_app.reader import DBPostProcess, FilterBoxes, GetRotateCropImage, SortedBoxes
-from paddle_serving_server_gpu.web_service import WebService
+if sys.argv[1] == 'gpu':
+    from paddle_serving_server_gpu.web_service import WebService
+elif sys.argv[1] == 'cpu':
+    from paddle_serving_server.web_service import WebService
 import time
 import re
 import base64
@@ -90,8 +93,12 @@ class OCRService(WebService):
 
 ocr_service = OCRService(name="ocr")
 ocr_service.load_model_config("ocr_rec_model")
-ocr_service.set_gpus("0")
-ocr_service.prepare_server(workdir="workdir", port=9292, device="gpu", gpuid=0)
+if sys.argv[1] == 'gpu':
+    ocr_service.set_gpus("0")
+    ocr_service.prepare_server(
+        workdir="workdir", port=9292, device="gpu", gpuid=0)
+elif sys.argv[1] == 'cpu':
+    ocr_service.prepare_server(workdir="workdir", port=9292)
 ocr_service.init_det_client(
     det_port=9293,
     det_client_config="ocr_det_client/serving_client_conf.prototxt")
diff --git a/python/examples/ocr/rec_web_server.py b/python/examples/ocr/rec_web_server.py
index 684c313d4d50cfe00c576c81aad05a810525dcce..aae97fd9e3fbd1d29b6cf2ef160b92a522db2e22 100644
--- a/python/examples/ocr/rec_web_server.py
+++ b/python/examples/ocr/rec_web_server.py
@@ -22,7 +22,10 @@ from paddle_serving_client import Client
 from paddle_serving_app.reader import Sequential, URL2Image, ResizeByFactor
 from paddle_serving_app.reader import Div, Normalize, Transpose
 from paddle_serving_app.reader import DBPostProcess, FilterBoxes, GetRotateCropImage, SortedBoxes
-from paddle_serving_server_gpu.web_service import WebService
+if sys.argv[1] == 'gpu':
+    from paddle_serving_server_gpu.web_service import WebService
+elif sys.argv[1] == 'cpu':
+    from paddle_serving_server.web_service import WebService
 import time
 import re
 import base64
@@ -64,8 +67,12 @@ class OCRService(WebService):
 
 ocr_service = OCRService(name="ocr")
 ocr_service.load_model_config("ocr_rec_model")
-ocr_service.set_gpus("0")
 ocr_service.init_rec()
-ocr_service.prepare_server(workdir="workdir", port=9292, device="gpu", gpuid=0)
+if sys.argv[1] == 'gpu':
+    ocr_service.set_gpus("0")
+    ocr_service.prepare_server(
+        workdir="workdir", port=9292, device="gpu", gpuid=0)
+elif sys.argv[1] == 'cpu':
+    ocr_service.prepare_server(workdir="workdir", port=9292, device="cpu")
 ocr_service.run_rpc_service()
 ocr_service.run_web_service()
diff --git a/python/paddle_serving_server/web_service.py b/python/paddle_serving_server/web_service.py
index b0c1b79bda5041b4eca114d778a23d3a123c226e..22b160341eba42ed02743dd03b99d4af2f737434 100755
--- a/python/paddle_serving_server/web_service.py
+++ b/python/paddle_serving_server/web_service.py
@@ -91,6 +91,8 @@ class WebService(object):
                                           request.json["fetch"])
             if isinstance(feed, dict) and "fetch" in feed:
                 del feed["fetch"]
+            if len(feed) == 0:
+                raise ValueError("empty input")
             fetch_map = self.client.predict(feed=feed, fetch=fetch)
             result = self.postprocess(
                 feed=request.json["feed"], fetch=fetch, fetch_map=fetch_map)
@@ -122,6 +124,32 @@ class WebService(object):
 
         self.app_instance = app_instance
 
+    def run_debugger_service(self):
+        import socket
+        localIP = socket.gethostbyname(socket.gethostname())
+        print("web service address:")
+        print("http://{}:{}/{}/prediction".format(localIP, self.port,
+                                                  self.name))
+        app_instance = Flask(__name__)
+
+        @app_instance.before_first_request
+        def init():
+            self._launch_local_predictor()
+
+        service_name = "/" + self.name + "/prediction"
+
+        @app_instance.route(service_name, methods=["POST"])
+        def run():
+            return self.get_prediction(request)
+
+        self.app_instance = app_instance
+
+    def _launch_local_predictor(self):
+        from paddle_serving_app.local_predict import Debugger
+        self.client = Debugger()
+        self.client.load_model_config(
+            "{}".format(self.model_config), gpu=False, profile=False)
+
     def run_web_service(self):
         self.app_instance.run(host="0.0.0.0",
                               port=self.port,
diff --git a/python/requirements.txt b/python/requirements.txt
index 19d18053504459b2e9c4d2d17cb0aa0243444186..23b5289d5109fcb119f143eef4deb65198555d6a 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -1,6 +1,9 @@
 numpy>=1.12, <=1.16.4 ; python_version<"3.5"
+wheel>=0.34.0, <0.35.0
+setuptools>=44.1.0
 opencv-python==4.2.0.32
 google>=2.0.3
+opencv-python==4.2.0.32
 protobuf>=3.12.2
 grpcio-tools>=1.28.1
 grpcio>=1.28.1
diff --git a/python/setup.py.app.in b/python/setup.py.app.in
index 1ee1cabb5a572536e6869852e3ab638cda6adcb8..2b7ae9303aa95eace7b0eab99d787ca43af48e00 100644
--- a/python/setup.py.app.in
+++ b/python/setup.py.app.in
@@ -42,7 +42,7 @@ if '${PACK}' == 'ON':
 
 
 REQUIRED_PACKAGES = [
-    'six >= 1.10.0', 'sentencepiece', 'opencv-python', 'pillow',
+    'six >= 1.10.0', 'sentencepiece', 'opencv-python<=4.2.0.32', 'pillow',
     'shapely', 'pyclipper'
 ]
 
diff --git a/tools/Dockerfile.centos6.cuda9.0-cudnn7.devel b/tools/Dockerfile.centos6.cuda9.0-cudnn7.devel
index 24a5d189b709e3ff92e0b0c16776b82a84eca3e6..b4af571c19cec131800dd871b558c00d601b2f5e 100644
--- a/tools/Dockerfile.centos6.cuda9.0-cudnn7.devel
+++ b/tools/Dockerfile.centos6.cuda9.0-cudnn7.devel
@@ -31,7 +31,6 @@ RUN yum -y install wget && \
     curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py && \
     python get-pip.py && \
     rm get-pip.py && \
-    pip install google protobuf setuptools wheel flask numpy==1.16.4 && \
     wget https://www.python.org/ftp/python/3.6.8/Python-3.6.8.tgz && \
     tar -zxf Python-3.6.8.tgz && \
     cd Python-3.6.8 && \
@@ -42,7 +41,6 @@ RUN yum -y install wget && \
     echo 'export LD_LIBRARY_PATH=/usr/local/python3.6/lib:$LD_LIBRARY_PATH' >> /root/.bashrc && \
     source /root/.bashrc && \
     cd .. && rm -rf Python-3.6.8* && \
-    pip3 install google protobuf setuptools wheel flask numpy==1.16.4 && \
     yum -y install epel-release && yum -y install patchelf libXext libSM libXrender && \
     yum clean all && \
     echo "export LANG=en_US.utf8" >> /root/.bashrc && \
diff --git a/tools/Dockerfile.centos6.devel b/tools/Dockerfile.centos6.devel
index 53d46d9dd5c5cb060d773cca2e9cb8c98cdefee1..6dfc304cb281f5bb7c7d60a0b38354118c893f39 100644
--- a/tools/Dockerfile.centos6.devel
+++ b/tools/Dockerfile.centos6.devel
@@ -31,7 +31,6 @@ RUN yum -y install wget && \
     curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py && \
     python get-pip.py && \
     rm get-pip.py && \
-    pip install google protobuf setuptools wheel flask numpy==1.16.4 && \
     wget https://www.python.org/ftp/python/3.6.8/Python-3.6.8.tgz && \
     tar -zxf Python-3.6.8.tgz && \
     cd Python-3.6.8 && \
@@ -42,7 +41,6 @@ RUN yum -y install wget && \
     echo 'export LD_LIBRARY_PATH=/usr/local/python3.6/lib:$LD_LIBRARY_PATH' >> /root/.bashrc && \
     source /root/.bashrc && \
     cd .. && rm -rf Python-3.6.8* && \
-    pip3 install google protobuf setuptools wheel flask numpy==1.16.4 && \
     yum -y install epel-release && yum -y install patchelf libXext libSM libXrender && \
     yum clean all && \
     localedef -c -i en_US -f UTF-8 en_US.UTF-8 && \
diff --git a/tools/Dockerfile.ci b/tools/Dockerfile.ci
index 92aee9e777387374397682b3a22dafe1294ccde4..0eb695d301f6b45c73d3f3b4af018bd2c83860ac 100644
--- a/tools/Dockerfile.ci
+++ b/tools/Dockerfile.ci
@@ -23,7 +23,6 @@ RUN wget https://dl.google.com/go/go1.14.linux-amd64.tar.gz >/dev/null \
 RUN yum -y install python-devel sqlite-devel >/dev/null \
     && curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py >/dev/null \
     && python get-pip.py >/dev/null \
-    && pip install google protobuf setuptools wheel flask >/dev/null \
     && rm get-pip.py
 
 RUN wget http://nixos.org/releases/patchelf/patchelf-0.10/patchelf-0.10.tar.bz2 \
@@ -35,8 +34,7 @@ RUN wget http://nixos.org/releases/patchelf/patchelf-0.10/patchelf-0.10.tar.bz2
     && cd .. \
     && rm -rf patchelf-0.10*
 
-RUN yum install -y python3 python3-devel \
-    && pip3 install google protobuf setuptools wheel flask
+RUN yum install -y python3 python3-devel
 
 RUN yum -y update >/dev/null \
     && yum -y install dnf >/dev/null \
diff --git a/tools/Dockerfile.cuda10.0-cudnn7.devel b/tools/Dockerfile.cuda10.0-cudnn7.devel
index 015412995e2152beaebd760b05d4989891b87c14..d65e1e256c8772101a51fcc58ab525aff9f182a1 100644
--- a/tools/Dockerfile.cuda10.0-cudnn7.devel
+++ b/tools/Dockerfile.cuda10.0-cudnn7.devel
@@ -23,11 +23,9 @@ RUN wget https://dl.google.com/go/go1.14.linux-amd64.tar.gz >/dev/null \
 RUN yum -y install python-devel sqlite-devel  \
     && curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py >/dev/null \
     && python get-pip.py >/dev/null \
-    && pip install google protobuf setuptools wheel flask >/dev/null \
     && rm get-pip.py 
 
 RUN yum install -y python3 python3-devel \
-    && pip3 install google protobuf setuptools wheel flask \
     && yum -y install epel-release && yum -y install patchelf libXext libSM libXrender\
     && yum clean all 
 
diff --git a/tools/Dockerfile.cuda9.0-cudnn7.devel b/tools/Dockerfile.cuda9.0-cudnn7.devel
index 4ca886a2309b2e643e68fb36f150e0393489e98f..b33ed58a2a97a6bea7a8f408c2e6a7f6ccc7d448 100644
--- a/tools/Dockerfile.cuda9.0-cudnn7.devel
+++ b/tools/Dockerfile.cuda9.0-cudnn7.devel
@@ -22,11 +22,9 @@ RUN wget https://dl.google.com/go/go1.14.linux-amd64.tar.gz >/dev/null \
 RUN yum -y install python-devel sqlite-devel  \
     && curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py >/dev/null \
     && python get-pip.py >/dev/null \
-    && pip install google protobuf setuptools wheel flask >/dev/null \
     && rm get-pip.py 
 
 RUN yum install -y python3 python3-devel \
-    && pip3 install google protobuf setuptools wheel flask \
     && yum -y install epel-release && yum -y install patchelf libXext libSM libXrender\
     && yum clean all 
 
diff --git a/tools/Dockerfile.devel b/tools/Dockerfile.devel
index a0ef073e798c49d3d419450b2430e8656b3afdfc..83e3b491c30fe99eaa615e836efeef6aad0c0cc4 100644
--- a/tools/Dockerfile.devel
+++ b/tools/Dockerfile.devel
@@ -19,11 +19,9 @@ RUN wget https://dl.google.com/go/go1.14.linux-amd64.tar.gz >/dev/null \
 RUN yum -y install python-devel sqlite-devel  \
     && curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py >/dev/null \
     && python get-pip.py >/dev/null \
-    && pip install google protobuf setuptools wheel flask >/dev/null \
     && rm get-pip.py 
 
 RUN yum install -y python3 python3-devel \
-    && pip3 install google protobuf setuptools wheel flask \
     && yum -y install epel-release && yum -y install patchelf libXext libSM libXrender\
     && yum clean all