Update accelerate

Signed-off-by: Jael Gu <mengjia.gu@zilliz.com>

s_bert.py

@@ -21,8 +21,12 @@ import torch
 from sentence_transformers import SentenceTransformer
 
 from towhee.operator import NNOperator
-# from towhee.dc2 import accelerate
-
+try:
+    from towhee import accelerate
+except:
+    def accelerate(func):
+        return func
+    
 import os
 import warnings