autograd: user custom function#385

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iblislin wants to merge 4 commits intomasterfrom

ib/nd-ad-customfunc-3

Commits on Dec 18, 2017

autograd: user custom function
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Commits on Dec 21, 2017

exports
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Commits on Dec 23, 2017

where syntax support
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Commits on Jan 19, 2018

Merge branch 'master' into ib/nd-ad-customfunc-3
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