Defaults to adamw_torch_fused for Pytorch>=2.8 (#37358)
* Defaults to adamw_torch_fused for latest Pytorch
Signed-off-by: cyy <cyyever@outlook.com>
* Fix test
Signed-off-by: cyy <cyyever@outlook.com>
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Signed-off-by: cyy <cyyever@outlook.com>
