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In nested AD using hasfield makes Zygote sad.
Also it is ugly compared to hasproperty

I thought I caught all uses of this in #391
but one must have been missed -- it was a huge PR.

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codecov-commenter commented Jul 26, 2021

Codecov Report

Merging #414 (b0f2d77) into master (d68a5b8) will increase coverage by 0.12%.
The diff coverage is 100.00%.

Impacted file tree graph

@@            Coverage Diff             @@
##           master     #414      +/-   ##
==========================================
+ Coverage   92.12%   92.25%   +0.12%     
==========================================
  Files          14       14              
  Lines         775      775              
==========================================
+ Hits          714      715       +1     
+ Misses         61       60       -1     
Impacted Files Coverage Δ
src/ChainRulesCore.jl 100.00% <ø> (ø)
src/projection.jl 95.56% <100.00%> (+0.49%) ⬆️

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Seems reasonable to me. Could you please leave a comment saying why getproperty is used rather than hasfield though?

Separate question: would @non_differentiableing hasfield not solve the problem?

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Could you please leave a comment saying why getproperty is used rather than hasfield though?

It is less code, though.
It is simply the most concise way to achieve the goal -- we have getproperty overloading for a reason.

I wanted this code before I knew it fixed Zygote.

Separate question: would @non_differentiableing hasfield not solve the problem?

I assume so, but I don't know, didn't try.
Not actually sure why changing to hasproperty fixes it.

@oxinabox oxinabox merged commit 424a0b7 into master Jul 26, 2021
@oxinabox oxinabox deleted the ox/zygotefix branch July 26, 2021 18:01
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4 participants