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test: check inference of batch size and Jacobian preparation for static arrays #1078

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Merged
gdalle merged 1 commit into from
Oct 13, 2026
Merged

test: check inference of batch size and Jacobian preparation for static arrays #1078

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21 changes: 21 additions & 0 deletions DifferentiationInterface/test/Core/Internals/batchsize.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,27 @@ end
) isa BSS{4, false, true}
end

@testset "Static arrays" begin
# the batch size must be deduced from the type, for any static array shape
for x in (@SVector(zeros(6)), @SMatrix(zeros(2, 3)), @MVector(zeros(6)))
@test (@inferred pick_batchsize(AutoSimpleFiniteDiff(), x)) isa BSS{6, true, true}
@test (@inferred pick_batchsize(AutoSimpleFiniteDiff(; chunksize = 4), x)) isa
BSS{4, false, false}
@test (@inferred pick_batchsize(AutoEnzyme(), x)) isa BSS{6, true, true}
@test (@inferred prepare_jacobian(identity, AutoSimpleFiniteDiff(), x)) isa
DI.PushforwardJacobianPrep{<:Any, BSS{6, true, true}}
@test (
@inferred prepare_jacobian(identity, AutoSimpleFiniteDiff(; chunksize = 4), x)
) isa DI.PushforwardJacobianPrep{<:Any, BSS{4, false, false}}
@test (@inferred jacobian(identity, AutoSimpleFiniteDiff(), x)) isa StaticMatrix
# multiple batches are assembled with `mapreduce(hcat, ...)`, which changes the
# static size at every step
@test_broken (
@inferred jacobian(identity, AutoSimpleFiniteDiff(; chunksize = 4), x)
) isa StaticMatrix
end
end

@testset "Thresholding" begin
@test threshold_batchsize(AutoSimpleFiniteDiff(), 2) isa AutoSimpleFiniteDiff{nothing}
@test threshold_batchsize(AutoSimpleFiniteDiff(; chunksize = 4), 2) isa
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