message: Increase tolerance in LinearOperatorCirculant3D test.  Was failing on python 3
diff: @@ -682,7 +682,7 @@ class LinearOperatorCirculant3DTest(test.TestCase):
  self.assertEqual(operator.dtype, dtypes.complex64)
  matrix = operator.to_dense().eval()
  self.assertAllEqual((2, 2 * 3 * 5, 2 * 3 * 5), matrix.shape)
  - np.testing.assert_allclose(0, np.imag(matrix), atol=1e-6)
  + np.testing.assert_allclose(0, np.imag(matrix), atol=1e-5)
  @test_util.run_deprecated_v1
  def test_defining_spd_operator_by_taking_real_part(self):
  