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Remove _get_ν #452

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Merged
merged 14 commits into from
May 17, 2022
Merged

Remove _get_ν #452

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c9015fa
Fix derivative of `_get_ν`
devmotion Apr 13, 2022
c4d23e8
Update Project.toml
devmotion Apr 13, 2022
08437cc
Update src/basekernels/matern.jl
devmotion Apr 13, 2022
8e4ad8f
Fix `rrule`
devmotion Apr 13, 2022
9bb7beb
Add test
devmotion Apr 13, 2022
6a467f9
Load ChainRulesTestUtils
devmotion Apr 13, 2022
b95a84a
Try to specify cotangent
devmotion Apr 13, 2022
c747f70
Update test/basekernels/matern.jl
devmotion Apr 13, 2022
aadcfa8
Update matern.jl
devmotion Apr 13, 2022
d87cc84
Update test/basekernels/matern.jl
devmotion Apr 13, 2022
e7f658b
Remove workaround
devmotion Apr 13, 2022
8473386
Update Project.toml
devmotion Apr 19, 2022
5b4e9d3
Merge branch 'master' into dw/fix_matern
devmotion Apr 19, 2022
4c45fe8
Fix test_interface
devmotion Apr 19, 2022
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2 changes: 1 addition & 1 deletion Project.toml
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
name = "KernelFunctions"
uuid = "ec8451be-7e33-11e9-00cf-bbf324bd1392"
version = "0.10.37"
version = "0.10.38"

[deps]
ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
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10 changes: 9 additions & 1 deletion src/basekernels/matern.jl
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Expand Up @@ -37,8 +37,16 @@ MaternKernel(; nu::Real=1.5, ν::Real=nu, metric=Euclidean()) = MaternKernel(ν,

@functor MaternKernel

# workaround for Zygote
# unclear why it's needed but it is fine since it's stated officially that we don't support differentiation with respect to ν
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@st-- st-- Apr 13, 2022 •
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Without this workaround, the Zygote AD test fails. You can see this in 30385ac and the corresponding build

@inline _get_ν(k::MaternKernel) = only(k.ν)
ChainRulesCore.@non_differentiable _get_ν(k) # work-around; should be "NotImplemented" rather than NoTangent
function ChainRulesCore.rrule(::typeof(_get_ν), k::T) where {T<:MaternKernel}
function _get_ν_pullback(Δ)
dν = ChainRulesCore.@not_implemented("derivatives of `MaternKernel` w.r.t. order `ν` are not implemented.")
return Tangent{T}(ν=dν, metric=NoTangent())
end
return _get_ν(k), _get_ν_pullback
end

@inline function kappa(k::MaternKernel, d::Real)
result = _matern(_get_ν(k), d)
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