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Expose dual tag to user #16

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Expose dual tag to user #16

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10 changes: 8 additions & 2 deletions src/derivatives.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,11 @@

abstract type AbstractDiffMethod end

struct ForwardAD <: AbstractDiffMethod end
struct ForwardAD <: AbstractDiffMethod
dualtag::Union{Nothing, Missing} # tag for dual numbers (missing=automatic)
ForwardAD(; dualtag=missing) = new(dualtag)
end

struct ReverseAD <: AbstractDiffMethod end
# struct RevZyg <: AbstractDiffMethod end # only used for gradients (not jacobians)
struct ForwardFD <: AbstractDiffMethod end
Expand Down Expand Up @@ -186,9 +190,11 @@ function createcache(sp::DensePattern, dtype::ForwardAD, func!, nx, ng)
fg[1] = func!(@view(fg[2:end]), x)
end

tag = ismissing(dtype.dualtag) ? combine! : dtype.dualtag

g = zeros(1 + ng)
x = zeros(nx)
config = ForwardDiff.JacobianConfig(combine!, g, x)
config = ForwardDiff.JacobianConfig(tag, g, x)
J = DiffResults.JacobianResult(g, x)

return DenseCache(combine!, g, J, config, dtype)
Expand Down