message: Get rid of remaining test_session().
diff: @@ -365,7 +365,7 @@ class ClassifierMetricsTest(test.TestCase, parameterized.TestCase):
  unused_image = array_ops.zeros([2, 299, 299, 3])
  incscore = _run_with_mock(classifier_metrics.inception_score, unused_image)
  - with self.test_session(use_gpu=True) as sess:
  + with self.cached_session(use_gpu=True) as sess:
  incscore_np = sess.run(incscore, {'concat:0': logits})
  self.assertAllClose(_expected_inception_score(logits), incscore_np)
  @@ -473,7 +473,7 @@ class ClassifierMetricsTest(test.TestCase, parameterized.TestCase):
  classifier_fn=lambda x: x,
  max_block_size=600)
  - with self.test_session() as sess:
  + with self.cached_session() as sess:
  actual_kid, actual_std = sess.run(kid_op)
  expected_kid, expected_std = _expected_kid_and_std(test_pool_real_a,
  @@ -500,7 +500,7 @@ class ClassifierMetricsTest(test.TestCase, parameterized.TestCase):
  max_block_size=max_block_size)
  for block_size in [50, 512, 1000]:
  - with self.test_session() as sess:
  + with self.cached_session() as sess:
  actual_kid, actual_std = sess.run(kid_op, {max_block_size: block_size})
  expected_kid, expected_std = _expected_kid_and_std(
  