revert a mis modification

modelscope/models/__init__.py

@@ -1,10 +1,10 @@
 # Copyright (c) Alibaba, Inc. and its affiliates.
 
-# from .audio.tts.am import SambertNetHifi16k
-# from .audio.tts.vocoder import Hifigan16k
+from .audio.tts.am import SambertNetHifi16k
+from .audio.tts.vocoder import Hifigan16k
 from .base import Model
 from .builder import MODELS, build_model
-# from .multi_model import OfaForImageCaptioning
+from .multi_model import OfaForImageCaptioning
 from .nlp import (
     BertForSequenceClassification,
     SbertForNLI,