message: Clarify percentage in error message.
diff: @@ -322,7 +322,7 @@ class RNNTest(test.TestCase):
  self.assertGreaterEqual(
  cudnn_vs_unified, 0.80,
  'Expect the performance of Unified LSTM is within 80% of CuDNN LSTM, '
  - 'but got {}'.format(cudnn_vs_unified * 100))
  + 'but got {}%'.format(cudnn_vs_unified * 100))
  # Assert the performance diff between CPU impl and GPU impl should be more
  # than 5 times.
  self.assertGreaterEqual(
  