Expose FrameStacker.
@@ -22,6 +22,7 @@ from acme.wrappers.canonical_spec import CanonicalSpecWrapper
from acme.wrappers.concatenate_observations import ConcatObservationWrapper
from acme.wrappers.delayed_reward import DelayedRewardWrapper
from acme.wrappers.expand_scalar_observation_shapes import ExpandScalarObservationShapesWrapper
+from acme.wrappers.frame_stacking import FrameStacker
from acme.wrappers.frame_stacking import FrameStackingWrapper
from acme.wrappers.gym_wrapper import GymAtariAdapter
from acme.wrappers.gym_wrapper import GymWrapper
