--- a
+++ b/mmaction/__init__.py
@@ -0,0 +1,16 @@
+# Copyright (c) OpenMMLab. All rights reserved.
+import mmcv
+from mmcv import digit_version
+
+from .version import __version__
+
+mmcv_minimum_version = '1.3.6'
+mmcv_maximum_version = '1.5.0'
+mmcv_version = digit_version(mmcv.__version__)
+
+assert (digit_version(mmcv_minimum_version) <= mmcv_version
+        <= digit_version(mmcv_maximum_version)), \
+    f'MMCV=={mmcv.__version__} is used but incompatible. ' \
+    f'Please install mmcv>={mmcv_minimum_version}, <={mmcv_maximum_version}.'
+
+__all__ = ['__version__']