add autograd and cupti#13

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yen-hsiang-chang wants to merge 4 commits intorai-project:masterfrom

yen-hsiang-chang:master

Commits on Jun 8, 2020

add autograd and cupti
yen-hsiang-chang
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Commits on Jun 10, 2020

move the timestamp to the time after constructing profiler
yen-hsiang-chang
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Commits on Jun 28, 2020

fix typo
yen-hsiang-chang
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Commits on Aug 22, 2020

fix some of the memory leak
yen-hsiang-chang
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