update gen_model_json

vllm/utils/__init__.py

@@ -2232,7 +2232,7 @@ class W8a8GetCacheJSON:
     #析构函数，最后会生成model.json的配置文件
     def gen_model_json(self,E:Optional[int]=0,block_size:Optional[list]=None):
         json_dir = os.getenv('LMSLIM_TUNING_JSON', "None")
-        if json_dir is not "None" and os.path.exists(json_dir):
+        if json_dir != "None" and os.path.exists(json_dir):
             #生成模型配置文件
             # logger.info("model_tuning.json is at LMSLIM_TUNING_JSON:%s", json_dir)
             config = {