A question about test_optim_adam_z_memory_check_1

[hkr04]

With my implementation and an old version from others, I got this assertion error:

But if I print one of the m, v, grad，it will pass (for both my implementation and another one):

Note that I only transform the m and v to ndl.Tensor for once and use the .data in calculation, and I can pass the previous test_optim_sgd_z_memory_check_1.

Could anyone explain this? I'm quite confused why this would influence the count of tensors. Thanks for help :)