Delete python2 imports from tensor encoding stages.

This is just a noop cleanup which should not affect functionality in any way.

PiperOrigin-RevId: 515716588

Author: tensorflower-gardener

tensorflow_model_optimization/python/core/internal/tensor_encoding/stages/stages_impl.py

@@ -13,10 +13,6 @@
 # limitations under the License.
 """Implementations of the encoding stage interfaces."""
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import collections
 import numpy as np
 import tensorflow as tf

tensorflow_model_optimization/python/core/internal/tensor_encoding/stages/stages_impl_test.py

@@ -12,10 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import itertools
 
 from absl.testing import parameterized