Update app.py

app.py

@@ -1,3 +1,5 @@
+from model_worker import ModelWorker
+
 import argparse
 import datetime
 import json
@@ -13,7 +15,6 @@ from mplug_docowl.conversation import (default_conversation, conv_templates,
 from mplug_docowl.constants import LOGDIR
 from mplug_docowl.utils import (build_logger, server_error_msg,
     violates_moderation, moderation_msg)
-from model_worker import ModelWorker
 import hashlib
 
 from huggingface_hub import snapshot_download