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dual exponent #605

Merged
merged 2 commits into from
Nov 11, 2022
Merged

dual exponent #605

merged 2 commits into from
Nov 11, 2022

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ptiede
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@ptiede ptiede commented Nov 11, 2022

This issue came up in FluxML/Zygote.jl#1324 (comment).

The problem is that on Julia 1.6, the GPU was sensing it could hit a code branch where exponent(::Dual) was being called, and unfortunately, exponent(::Dual) does not exist, so the GPU threw a dynamic call error and gave up. This pull request fixes this.

Solving this problem is pretty easy since exponent: Real --> Int function, so you can take a similar path compared to trunc and define the Dual argument to return the primal value, which I did.

@ptiede ptiede changed the title Pt exponent dual exponent Nov 11, 2022
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Looks good, assuming tests pass

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ptiede commented Nov 11, 2022

The tests passed! I think we are good to merge.

@mcabbott mcabbott merged commit 80b9d5d into JuliaDiff:master Nov 11, 2022
@ptiede ptiede deleted the pt-exponent branch November 11, 2022 13:35
@devmotion devmotion mentioned this pull request Dec 3, 2022
mcabbott pushed a commit to mcabbott/ForwardDiff.jl that referenced this pull request Dec 3, 2022
* add exponent(::Dual)

* revert spacing
mcabbott added a commit that referenced this pull request Dec 10, 2022
* dual exponent (#605)

* add exponent(::Dual)

* revert spacing

* tell CI to run on this branch

* version bump

Co-authored-by: Paul Tiede <ptiede91@gmail.com>
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2 participants