bug fix IWAE: use SGVB1 instead of SGVB2, detach sample weights gradi…#53

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tongdaxu wants to merge 1 commit intoAntixK:masterfrom tongdaxu:master

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Commits on Mar 15, 2022

bug fix IWAE: use SGVB1 instead of SGVB2, detach sample weights gradient properly
xutongda
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