message: Bump the rtol in hmc_test
diff: @@ -617,7 +617,7 @@ class _HMCHandlesLists(object):
  expected_vars,
  ])
  self.assertAllClose(expected_means_, actual_means_, atol=0.05, rtol=0.16)
  - self.assertAllClose(expected_vars_, actual_vars_, atol=0., rtol=0.30)
  + self.assertAllClose(expected_vars_, actual_vars_, atol=0., rtol=0.40)
  class HMCHandlesLists16(_HMCHandlesLists, test.TestCase):
  