message: Increase error bounds on blocks_test.py test.
  blocks_test_gpu is failing with relative errors of ~5e-5. This cl increases the error tolerance from 1e-6 to 1e-4.
diff: @@ -261,9 +261,9 @@ class _ResidualTest(tf.test.TestCase):
  y_tr, y_ev = residual(x, training=True), residual(x, training=False)
  x_ = residual.backward(y_ev, training=False)
  - self.assertAllClose(x, x_)
  + self.assertAllClose(x, x_, rtol=1e-4, atol=1e-4)
  x_ = residual.backward(y_tr, training=True) # This updates moving avg
  - self.assertAllClose(x, x_)
  + self.assertAllClose(x, x_, rtol=1e-4, atol=1e-4)
  def test_backward_grads_and_vars_channels_first(self):
  """Test `backward_grads` function with `channels_first` data format."""
  