diff --git a/imperative/python/megengine/experimental/__init__.py b/imperative/python/megengine/experimental/__init__.py
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..0253e7dcabee24c3271d1d8b14c8f75a2e15596d 100644
--- a/imperative/python/megengine/experimental/__init__.py
+++ b/imperative/python/megengine/experimental/__init__.py
@@ -0,0 +1,8 @@
+# -*- coding: utf-8 -*-
+# MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
+#
+# Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT ARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
diff --git a/imperative/python/megengine/functional/nn.py b/imperative/python/megengine/functional/nn.py
index 663d7fa5535f9027bf905d30dac94f89c153f1ff..ffe7b7c7f2e95da1ccc144d1d9cf90c94d5ba344 100644
--- a/imperative/python/megengine/functional/nn.py
+++ b/imperative/python/megengine/functional/nn.py
@@ -1462,6 +1462,5 @@ warp_affine = deprecated_func("1.3", "megengine.functional.vision", "warp_affine
 warp_perspective = deprecated_func(
     "1.3", "megengine.functional.vision", "warp_perspective", True
 )
-
-from .loss import *  # isort:skip
 from .quantized import conv_bias_activation  # isort:skip
+from .loss import *  # isort:skip
diff --git a/imperative/python/scripts/format.sh b/imperative/python/scripts/format.sh
new file mode 100755
index 0000000000000000000000000000000000000000..022206559608f30552ced18c7ac284b2b1dfc326
--- /dev/null
+++ b/imperative/python/scripts/format.sh
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -e
+cd $(dirname $0)/..
+
+ISORT_ARG=""
+BLACK_ARG=""
+
+while getopts 'd' OPT; do
+    case $OPT in
+        d)
+            ISORT_ARG="--diff --check-only"
+            BLACK_ARG="--diff --check"
+            ;;
+        ?)
+            echo "Usage: `basename $0` [-d]"
+    esac
+done
+
+# do not isort megengine/__init__.py file, caused we must
+# init library load path before load dependent lib in core
+isort $ISORT_ARG -j $(nproc) -rc megengine test examples -s megengine/__init__.py
+black $BLACK_ARG --target-version=py35 -- megengine test examples