message: Don't close session in debug_gradients_test.py.
diff: @@ -39,7 +39,7 @@ class IdentifyGradientTest(test_util.TensorFlowTestCase):
  def setUp(self):
  self.sess = session.Session()
  - with self.sess:
  + with self.sess.as_default():
  self.u = variables.Variable(2.0, name="u")
  self.v = variables.Variable(3.0, name="v")
  self.w = math_ops.multiply(self.u.value(), self.v.value(), name="w")
  