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Merge branch 'develop_v2.8' of http://10.16.6.30/dcutoolkit/deeplearing/TransformerEngine into release_v2.8

Merge branch 'develop_v2.8' of http://10.16.6.30/dcutoolkit/deeplearing/TransformerEngine into release_v2.8

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support activation offloading

See merge request dcutoolkit/deeplearing/TransformerEngine!44

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