message: Use default_strategy instead of dummy scope
diff: @@ -17,7 +17,6 @@ from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  -import contextlib
  import os
  from absl.testing import parameterized
  @@ -43,15 +42,9 @@ from tensorflow.python.platform import test
  from tensorflow.python.training import gradient_descent as gradient_descent_v1
  from tensorflow.python.training.tracking import util as trackable_utils
  -class DummyStrategy(object):
  - @contextlib.contextmanager
  - def scope(self):
  - yield
  -
  maybe_distribute = combinations.combine(
  distribution=[
  - combinations.NamedDistribution(
  - "Dummy", lambda: DummyStrategy(), required_gpus=None),
  + strategy_combinations.default_strategy,
  strategy_combinations.mirrored_strategy_with_cpu_1_and_2
  ])
  