fix serving export (fix #1449)

examples/FasterRCNN/predict.py

@@ -150,7 +150,7 @@ if __name__ == '__main__':
         if args.output_pb:
             ModelExporter(predcfg).export_compact(args.output_pb, optimize=False)
         elif args.output_serving:
-            ModelExporter(predcfg).export_serving(args.output_serving, optimize=False)
+            ModelExporter(predcfg).export_serving(args.output_serving)
 
         if args.predict:
             predictor = OfflinePredictor(predcfg)

tensorpack/tfutils/export.py

@@ -97,7 +97,7 @@ class ModelExporter(object):
 
         Args:
             filename (str): path for export directory
-            tags (tuple): tuple of user specified tags. Defaults to "SERVING".
+            tags (tuple): tuple of user specified tags. Defaults to just "SERVING".
             signature_name (str): name of signature for prediction
 
         Note:
@@ -115,7 +115,7 @@ class ModelExporter(object):
         """
         if tags is None:
             tags = (tf.saved_model.SERVING if get_tf_version_tuple() >= (1, 12)
-                    else tf.saved_model.tag_constants.SERVING)
+                    else tf.saved_model.tag_constants.SERVING, )
 
         self.graph = self.config._maybe_create_graph()
         with self.graph.as_default():