add requirement

python/requirements.txt

-numpy>=1.12, <=1.16.4 ; grpcio>=1.28.1 ; python_version<"3.5"
+numpy>=1.12, <=1.16.4 ; grpcio-tools>=1.28.1 ; grpcio>=1.28.1 ; python_version<"3.5"

python/setup.py.client.in

@@ -58,7 +58,8 @@ if '${PACK}' == 'ON':
 
 
 REQUIRED_PACKAGES = [
-    'six >= 1.10.0', 'protobuf >= 3.1.0', 'numpy >= 1.12', 'grpcio >= 1.28.1'
+    'six >= 1.10.0', 'protobuf >= 3.1.0', 'numpy >= 1.12', 'grpcio >= 1.28.1',
+    'grpcio-tools >= 1.28.1'
 ]
 
 if not find_package("paddlepaddle") and not find_package("paddlepaddle-gpu"):

python/setup.py.server.in

@@ -37,7 +37,7 @@ def python_version():
 max_version, mid_version, min_version = python_version()
 
 REQUIRED_PACKAGES = [
-    'six >= 1.10.0', 'protobuf >= 3.1.0', 'grpcio >= 1.28.1',
+    'six >= 1.10.0', 'protobuf >= 3.1.0', 'grpcio >= 1.28.1', 'grpcio-tools >= 1.28.1',
     'paddle_serving_client', 'flask >= 1.1.1', 'paddle_serving_app'
 ]
 

python/setup.py.server_gpu.in

@@ -37,7 +37,7 @@ def python_version():
 max_version, mid_version, min_version = python_version()
 
 REQUIRED_PACKAGES = [
-    'six >= 1.10.0', 'protobuf >= 3.1.0', 'grpcio >= 1.28.1',
+    'six >= 1.10.0', 'protobuf >= 3.1.0', 'grpcio >= 1.28.1', 'grpcio-tools >= 1.28.1',
     'paddle_serving_client', 'flask >= 1.1.1', 'paddle_serving_app'
 ]