message: Iteritems is deprecated in python 3. Using items instead.
diff: @@ -94,7 +94,7 @@ class CrossTowerOpsTest(test.TestCase, parameterized.TestCase):
  self.assertEqual(type(left), type(right))
  self.assertEqual(left.devices, right.devices)
  if isinstance(list(left._index.values())[0], ops.IndexedSlices):
  - for (d, v) in left._index.iteritems():
  + for (d, v) in left._index.items():
  self._assert_indexed_slices_equal(v, right._index[d])
  elif context.executing_eagerly():
  self.assertEqual([v.numpy() for v in left._index.values()],
  