Platforms: linux

This test was disabled because it is failing on master ([recent examples](http://torch-ci.com/failure/test_torch.py%3A%3ATestTorch%3A%3Atest_equal)).

The cause seems to point to https://github.com/pytorch/pytorch/pull/100024 (or D45282119 as it was landed internally)

cc @mruberry @houseroad @ezyang 
# Check 
        self.assertEqual(t0, s0)
        self.assertEqual(t1, s1)
        self.assertEqual(t2, s2)
        t0[()] = 1
        t1[1] = 3
        t2[1, 1] = 7
        # Check 
        self.assertEqual(t0, s0)
        self.assertEqual(t1, s1)
        self.assertEqual(t2, s2)
        # Check 
        self.assertTrue(s0.member_var is SubTensor.member_var)
        self.assertTrue(s1.member_var is SubTensor.member_var)
        self.assertTrue(s2.member_var is SubTensor.member_var)
        # Test t
        t = torch.tensor(5, d=torch.float32, requires_grad=True)
        # Run a 
        exp_t = torch.exp(t)
        # Cast e
        exp_s = exp_t.as_subclass(SubTensor)
        # Make s
        self.assertTrue(t.grad is None)
        # Run th
        exp_s.backward()
        # Make s
        # declar
        self.assertTrue(t.grad is not None)
        # Make s
        class BadSubTensor():