from __future__ import absolute_import
from imgaug.augmenters.arithmetic import *
from imgaug.augmenters.blur import *
from imgaug.augmenters.color import *
from imgaug.augmenters.contrast import *
from imgaug.augmenters.convolutional import *
from imgaug.augmenters.flip import *
from imgaug.augmenters.geometric import *
from imgaug.augmenters.meta import *
from imgaug.augmenters.overlay import *
from imgaug.augmenters.segmentation import *
from imgaug.augmenters.size import *

from __future__ import absolute_import
from imgaug.augmenters.arithmetic import *
from imgaug.augmenters.blur import *
from imgaug.augmenters.color import *
from imgaug.augmenters.contrast import GammaContrast, SigmoidContrast, LogContrast, LinearContrast
from imgaug.augmenters.convolutional import *
from imgaug.augmenters.flip import *
from imgaug.augmenters.geometric import *
from imgaug.augmenters.meta import *
from imgaug.augmenters.overlay import *
from imgaug.augmenters.segmentation import *
from imgaug.augmenters.size import *

--- 
+++ 
@@ -2,7 +2,7 @@
 from imgaug.augmenters.arithmetic import *
 from imgaug.augmenters.blur import *
 from imgaug.augmenters.color import *
-from imgaug.augmenters.contrast import GammaContrast, SigmoidContrast, LogContrast, LinearContrast
+from imgaug.augmenters.contrast import *
 from imgaug.augmenters.convolutional import *
 from imgaug.augmenters.flip import *
 from imgaug.augmenters.geometric import *
Switch import from contrast to all

Change import from contrast.py in
augmenters/__init__.py to * instead of
selective, as * should not import private
methods anyways.
