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Test for forward mode jacobians #1882

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d057de1
Test for forward mode jacobians
lassepe Nov 17, 2025
ad662d3
Add at-allowscalar
lassepe Nov 21, 2025
b6d8509
Add Enzyme.tupsack dispatch for Reactant.RArray
lassepe Nov 21, 2025
2e06801
Update Enzyme.jl
wsmoses Nov 22, 2025
5204fea
Update Enzyme.jl
wsmoses Nov 22, 2025
97c29f3
Update Enzyme.jl
wsmoses Nov 22, 2025
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14 changes: 14 additions & 0 deletions src/Enzyme.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,20 @@ end
return Base.zero(x)
end

@inline function Enzyme.tupstack(
data::Tuple{<:RArray, Vararg{<:RArray}},
outshape::Tuple{Vararg{Int}},
inshape::Tuple{Vararg{Int}},
)
res = similar(first(data), outshape..., inshape...)
c = CartesianIndices(outshape)
tail_dims = map(Returns(:), inshape)
for (i, val) in enumerate(data)
@inbounds res[c[i], tail_dims...] = val
end
return res
end

macro register_make_zero_inplace(sym)
quote
@inline function $sym(prev::RArray{T,N})::Nothing where {T<:AbstractFloat,N}
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13 changes: 13 additions & 0 deletions test/autodiff.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -102,6 +102,19 @@ end
@test res[1] ≈ ones(2, 2)
end

f_sincos(x) = map(sin, x) + map(cos, reverse(x))
f_sincos_jac(x) = [cos(x[i]) * (i == j ? 1 : 0) - sin(x[end-i+1]) * (i == (length(x) - j + 1) ? 1 : 0) for i in 1:length(x), j in 1:length(x)]

@testset "Forward Jacobian" begin
jac(x) = only(Enzyme.jacobian(Enzyme.Forward, f_sincos, x))
x_r = Reactant.to_rarray(rand(10))

j_gt = Reactant.@allowscalar f_sincos_jac(x_r)
j_reactant = Reactant.@jit jac(x_r)

@test j_reactant ≈ j_gt
end

mutable struct StateReturn
st::Any
end
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