diff --git a/ppcls/arch/head/arcmargin.py b/ppcls/arch/head/arcmargin.py
index 82da7f093fde2949d1d5c15195318737550d4cac..4f27acbdd684d5634e8af3d94a429a36b6986953 100644
--- a/ppcls/arch/head/arcmargin.py
+++ b/ppcls/arch/head/arcmargin.py
@@ -30,7 +30,7 @@ class ArcMargin(nn.Layer):
         self.easy_margin = easy_margin
 
         weight_attr =  paddle.ParamAttr(initializer = paddle.nn.initializer.XavierNormal())
-        self.fc = nn.Linear(self.embedding_size, self.class_dim, weight_attr=weight_attr, bias_attr=False) 
+        self.fc = nn.Linear(self.embedding_size, self.class_num, weight_attr=weight_attr, bias_attr=False) 
 
     def forward(self, input, label):
         input_norm = paddle.sqrt(paddle.sum(paddle.square(input), axis=1, keepdim=True))
@@ -53,7 +53,7 @@ class ArcMargin(nn.Layer):
         else:
             phi = self._paddle_where_more_than(cos, th, phi, cos - mm)
 
-        one_hot = paddle.nn.functional.one_hot(label, self.class_dim)
+        one_hot = paddle.nn.functional.one_hot(label, self.class_num)
         one_hot = paddle.squeeze(one_hot, axis=[1])
         output  = paddle.multiply(one_hot, phi) + paddle.multiply((1.0 - one_hot), cos)
         output  = output * self.scale