add service mode for prepare

tests/prepare.sh

 #!/bin/bash
 FILENAME=$1
-# MODE be one of ['lite_train_infer' 'whole_infer' 'whole_train_infer', 'infer']
+# MODE be one of ['lite_train_infer' 'whole_infer' 'whole_train_infer', 'infer', 'serving_infer']
 MODE=$2
 
 dataline=$(cat ${FILENAME})
@@ -75,13 +75,14 @@ else
     fi 
 fi
 
-# prepare serving env
-python_name=$(func_parser_value "${lines[2]}")
-${python_name} -m pip install install paddle-serving-server-gpu==0.6.1.post101
-${python_name} -m pip install paddle_serving_client==0.6.1
-${python_name} -m pip install paddle-serving-app==0.6.1
-wget -nc  -P ./inference https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_mobile_v2.0_det_infer.tar
-wget -nc  -P ./inference https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_mobile_v2.0_rec_infer.tar
-cd ./inference && tar xf ch_ppocr_mobile_v2.0_det_infer.tar && tar xf ch_ppocr_mobile_v2.0_rec_infer.tar
-
+if [ ${MODE} = "serving_infer" ];then
+    # prepare serving env
+    python_name=$(func_parser_value "${lines[2]}")
+    ${python_name} -m pip install install paddle-serving-server-gpu==0.6.1.post101
+    ${python_name} -m pip install paddle_serving_client==0.6.1
+    ${python_name} -m pip install paddle-serving-app==0.6.1
+    wget -nc  -P ./inference https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_mobile_v2.0_det_infer.tar
+    wget -nc  -P ./inference https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_mobile_v2.0_rec_infer.tar
+    cd ./inference && tar xf ch_ppocr_mobile_v2.0_det_infer.tar && tar xf ch_ppocr_mobile_v2.0_rec_infer.tar
+fi