fix ocr demo

python/examples/ocr/det_debugger_server.py

@@ -23,7 +23,7 @@ from paddle_serving_app.reader import Div, Normalize, Transpose
 from paddle_serving_app.reader import DBPostProcess, FilterBoxes
 if sys.argv[1] == 'gpu':
     from paddle_serving_server_gpu.web_service import WebService
-elif sys.argv[1] == 'cpu'
+elif sys.argv[1] == 'cpu':
     from paddle_serving_server.web_service import WebService
 import time
 import re
@@ -69,7 +69,8 @@ ocr_service = OCRService(name="ocr")
 ocr_service.load_model_config("ocr_det_model")
 if sys.argv[1] == 'gpu':
     ocr_service.set_gpus("0")
-    ocr_service.prepare_server(workdir="workdir", port=9292, device="gpu", gpuid=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()