diff --git a/deepmd/infer/deep_polar.py b/deepmd/infer/deep_polar.py
index 846efc9bde..d594be32f8 100644
--- a/deepmd/infer/deep_polar.py
+++ b/deepmd/infer/deep_polar.py
@@ -84,7 +84,6 @@ def __init__(
         DeepTensor.__init__(
             self,
             model_file,
-            9,
             load_prefix=load_prefix,
             default_tf_graph=default_tf_graph,
         )