[AutoDiff] Handle differentiation of @autodiff functions.
#21792
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Given an `AutoDiffFunctionExtractInst` in PrimalGen, get its VJP by simply extracting the VJP of its function operand. Thanks for detailed guidance from @rxwei.
`autodiff_function_extract` consumes its function operand. Thus, the function operand should be retained before `autodiff_function_extract`.
rxwei
approved these changes
Jan 11, 2019
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Given an
AutoDiffFunctionExtractInstin PrimalGen, get its VJP bysimply extracting the VJP of its function operand.
Thanks for detailed guidance from @rxwei.