fix ci and single process mode tips

demo/serving/module_serving/classification_vgg11_imagenet/vgg11_imagenet_serving_demo.py

@@ -5,7 +5,8 @@ import json
 if __name__ == "__main__":
     # 指定要预测的图片并生成列表[("image", img_1), ("image", img_2), ... ]
     file_list = [
-        "../../../../docs/imgs/cat.jpg", "../../../../docs/imgs/flower.jpg"
+        "../../../../docs/imgs/cat.jpg",
+        "../../../../docs/imgs/flower.jpg"
     ]
     files = [("image", (open(item, "rb"))) for item in file_list]
     # 指定预测方法为vgg11_imagenet并发送post请求

demo/serving/module_serving/object_detection_yolov3_darknet53_coco2017/yolov3_darknet53_coco2017_serving_demo.py

@@ -7,7 +7,8 @@ import os
 if __name__ == "__main__":
     # 指定要检测的图片并生成列表[("image", img_1), ("image", img_2), ... ]
     file_list = [
-        "../../../../docs/imgs/cat.jpg", "../../../../docs/imgs/dog.jpg"
+        "../../../../docs/imgs/cat.jpg",
+        "../../../../docs/imgs/dog.jpg"
     ]
     files = [("image", (open(item, "rb"))) for item in file_list]
     # 指定检测方法为yolov3_coco2017并发送post请求

paddlehub/commands/serving.py

@@ -344,7 +344,9 @@ class ServingCommand(BaseCommand):
                 with open(config_file, "r") as fp:
                     configs = json.load(fp)
                     use_multiprocess = configs.get("use_multiprocess", False)
-                    if single_mode is True or platform.system() == "Windows":
+                    if single_mode is True:
+                        ServingCommand.start_single_app_with_file(configs)
+                    elif platform.system() == "Windows":
                         print(
                             "Warning: Windows cannot use multiprocess working "
                             "mode, PaddleHub Serving will switch to single process mode"
@@ -360,7 +362,9 @@ class ServingCommand(BaseCommand):
             else:
                 print("config_file ", config_file, "not exists.")
         else:
-            if single_mode is True or platform.system() == "Windows":
+            if single_mode is True:
+                self.start_single_app_with_args()
+            elif platform.system() == "Windows":
                 print(
                     "Warning: Windows cannot use multiprocess working "
                     "mode, PaddleHub Serving will switch to single process mode"