Migrate tensorflow_graphics/image to Python 3.

PiperOrigin-RevId: 359305222

tensorflow_graphics/image/pyramid.py

@@ -22,6 +22,7 @@
 from __future__ import print_function
 
 import numpy as np
+from six.moves import range
 import tensorflow as tf
 
 from tensorflow_graphics.util import export_api

tensorflow_graphics/image/tests/pyramid_test.py

@@ -13,8 +13,13 @@
 # limitations under the License.
 """Tests for image pyramids."""
 
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
 from absl.testing import parameterized
 import numpy as np
+from six.moves import range
 import tensorflow as tf
 
 from tensorflow_graphics.image import pyramid

tensorflow_graphics/image/transformer.py

@@ -17,6 +17,7 @@
 import enum
 from typing import Optional
 
+from six.moves import range
 import tensorflow as tf
 from tensorflow_addons import image as tfa_image