message: change rtol to 1e-4 when compare model with different optimize level
diff: @@ -294,7 +294,7 @@ class TestPrepackCases(TestCase):
  loss2.backward()
  ipex_optimizer2.step()
  self.assertEqual(y, y1)
  - self.assertEqual(y1, y2, rtol=1e-5, atol=1e-3)
  + self.assertEqual(y1, y2, rtol=1e-4, atol=1e-3)
  self.assertEqual(loss, loss1)
  self.assertEqual(loss1, loss2, rtol=1e-5, atol=1e-3)
  