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Add test for ForwardDiff with StaticArrays #650

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Merged
merged 6 commits into from
Jul 30, 2025
Merged

Add test for ForwardDiff with StaticArrays #650

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592dc07
add test for forwarddiff static arrays
jClugstor Jul 28, 2025
763e60b
add test for cache type
jClugstor Jul 28, 2025
c28a6da
import StaticArrays for test
jClugstor Jul 28, 2025
949e8e8
remove unnecessary part of test
jClugstor Jul 28, 2025
8b4e443
add init for StaticLinearProblem
jClugstor Jul 29, 2025
ff84c9a
add explanatory comment
jClugstor Jul 29, 2025
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37 changes: 37 additions & 0 deletions test/forwarddiff_overloads.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@ using LinearSolve
using ForwardDiff
using Test
using SparseArrays
using StaticArrays

function h(p)
(A = [p[1] p[2]+1 p[2]^3;
Expand Down Expand Up @@ -193,3 +194,39 @@ overload_x_p = solve(prob, UMFPACKFactorization())
backslash_x_p = A \ b

@test ≈(overload_x_p, backslash_x_p, rtol = 1e-9)


# Test StaticArrays
# They don't go through the overloads
# But we should test that the overloads don't mess anything up
function static_h(p)
A = @SMatrix [p[1] p[2]+1 p[2]^3;
3*p[1] p[1]+5 p[2] * p[1]-4;
p[2]^2 9*p[1] p[2]]

b = SA[p[1] + 1, p[2] * 2, p[1]^2]

(A, b)
end

function static_linsolve(p)
A, b = static_h(p)
prob = LinearProblem(A, b)
solve(prob)
end

function static_backslash(p)
A, b = static_h(p)
A \ b
end

@test (ForwardDiff.jacobian(static_linsolve, [5.0, 5.0]) ≈
ForwardDiff.jacobian(static_backslash, [5.0, 5.0]))

#Test to make sure that the cache is not a DualLinearCache
A, b = static_h([ForwardDiff.Dual(5.0, 1.0, 0.0), ForwardDiff.Dual(5.0, 0.0, 1.0)])

static_dual_prob = LinearProblem(A, b)
static_dual_cache = init(static_dual_prob)

@test static_dual_cache isa LinearSolve.LinearCache
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