add depthwise conv attr

mindspore/ops/operations/nn_ops.py

@@ -862,6 +862,7 @@ class DepthwiseConv2dNative(PrimitiveWithInfer):
         self.channel_multiplier = validator.check_integer("channel_multiplier", channel_multiplier, 0, Rel.GT,
                                                           self.name)
         self.group = validator.check_integer("group", group, 0, Rel.GT, self.name)
+        self.add_prim_attr('offset_a', 0)
 
     def infer_shape(self, x_shape, w_shape):
         validator.check_integer("weight rank", len(w_shape), 4, Rel.EQ, self.name)