diff --git a/mace/python/tools/converter_tool/transformer.py b/mace/python/tools/converter_tool/transformer.py
index cb79eec2bd81dd85f1a0233a654e07bc8a87b243..cd8a94ab3db165204f1acd13b12701fc33877b0b 100644
--- a/mace/python/tools/converter_tool/transformer.py
+++ b/mace/python/tools/converter_tool/transformer.py
@@ -628,14 +628,13 @@ class Transformer(base_converter.ConverterInterface):
                 framework = ConverterUtil.get_arg(
                         op, MaceKeyword.mace_framework_type_str).i
                 input_len = len(op.input)
-                if consumer_op.type == MaceOp.BatchNorm.name and \
+                if consumer_op.type == MaceOp.BatchNorm.name and (
                         (framework == FrameworkType.CAFFE.value and
-                         (input_len == 2 or
-                             (input_len == 3 and
-                              op.input[-1] in self._consts))) or \
+                         (input_len == 2 or (input_len == 3 and
+                                             op.input[-1] in self._consts))) or
                         (framework == FrameworkType.TENSORFLOW.value and
                          (input_len == 3 or (input_len == 4 and
-                                             op.input[-1] in self._consts))):
+                                             op.input[-1] in self._consts)))):
                     print("Fold deconv and bn: %s(%s)" % (op.name, op.type))
                     filter = self._consts[op.input[1]]
                     scale = self._consts[consumer_op.input[1]]