JuliaDiff/ForwardDiff.jl

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Forward Mode Automatic Differentiation for Julia

Stars: 1k
Forks: 160
Open beginner issues: 0
Indexed issues: 128

Dominant language: Julia
License: No license data
Last GitHub push: Sep 11, 2026
Latest indexed: Sep 18, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

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128 issues indexed so far

`gradient!` leaves part of the result unwritten when `f` does not depend on its argument Open

Difficulty 3/5 1-2 days Newbie friendliness 78/100

JuliaDiff/ForwardDiff.jl#847 · Opened Sep 1, 2026
hessian!(::ImmutableDiffResult, f, ::StaticArray) errors when f does not depend on its argument Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

JuliaDiff/ForwardDiff.jl#846 · 1 comment · Opened Sep 1, 2026
hessian: the two nested dual layers share a tag, so results depend on the code path and chunk size Open

Difficulty 4/5 3-5 days Newbie friendliness 64/100

JuliaDiff/ForwardDiff.jl#845 · Opened Sep 1, 2026
Reusing a `GradientConfig`/`JacobianConfig` with a differently structured input silently computes wrong derivatives Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

JuliaDiff/ForwardDiff.jl#842 · Opened Aug 19, 2026
Chunked `jacobian` throws for `Diagonal`/`LowerTriangular`/`UpperTriangular` inputs Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

JuliaDiff/ForwardDiff.jl#839 · Opened Aug 17, 2026
`gradient!` writes to the wrong entries for structured inputs Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

JuliaDiff/ForwardDiff.jl#838 · Opened Aug 17, 2026
Take advantage of symmetry in `hessian` Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#836 · 3 comments · Opened Aug 15, 2026
3-arg `hypot` flattens `Dual`s with different tags, and rejects non-`Type` tags Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

JuliaDiff/ForwardDiff.jl#834 · Opened Aug 5, 2026
checktag's permissive fallback silently disables tag checking (e.g. for derivative(f!, y, x, cfg)) Open

Difficulty 4/5 3-5 days Newbie friendliness 50/100

JuliaDiff/ForwardDiff.jl#833 · Opened Aug 5, 2026
jacobian(f!, y, x) doesn't work if y is complex Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#832 · Opened Aug 5, 2026
jacobian(f, x) silently returns zeros if f is complex-valued Open

Difficulty 3/5 1-2 days Newbie friendliness 75/100

JuliaDiff/ForwardDiff.jl#830 · Opened Aug 5, 2026
derivative(f!, y, x) doesn't work if y is complex, even if x is real Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

JuliaDiff/ForwardDiff.jl#818 · 1 comment · Opened Jun 25, 2026
tagging API? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

JuliaDiff/ForwardDiff.jl#813 · Opened Jun 8, 2026
Deferred computation for precompilable tags? Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#812 · 1 reaction · Opened Jun 7, 2026
SpecialFunctions.jl could be a weak dep? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#800 · 1 comment · Opened Apr 5, 2026
Wrong broadcasting in case of complex numbers Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

JuliaDiff/ForwardDiff.jl#795 · 1 comment · Opened Feb 17, 2026
norm() on a zero vector with non-zero partials gives nan value for v1.3.1+ Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

JuliaDiff/ForwardDiff.jl#794 · 2 comments · Opened Feb 12, 2026
NaN partials and comparison Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

JuliaDiff/ForwardDiff.jl#790 · 1 comment · Opened Dec 24, 2025
Error with ForwardDiff 1 and QuadGK Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#785 · 5 comments · Opened Nov 17, 2025
Allow Dual{T, SIMD.Vec, N} Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

JuliaDiff/ForwardDiff.jl#784 · Opened Nov 15, 2025
Scalar indexing error when computing Jacobian with a `CUDA.CuArray` Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#759 · 3 comments · Opened Aug 8, 2025
Modifying a single index of a vector valued function doesn't work Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#752 · 1 comment · Opened Jun 5, 2025
use `HessianConfig` to calculate gradients? Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

JuliaDiff/ForwardDiff.jl#734 · Opened Feb 5, 2025
Derivative issue with DiffResults and nested arrays Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

JuliaDiff/ForwardDiff.jl#725 · 1 comment · Opened Nov 20, 2024
Precompilation can lead to Dual tag ordering problems Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

JuliaDiff/ForwardDiff.jl#714 · 3 comments · 1 reaction · Opened Oct 29, 2024
Unsupported operation when using CUDA Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#713 · Opened Oct 13, 2024
Gradients with respect to struct fields? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

JuliaDiff/ForwardDiff.jl#709 · 2 comments · Opened Aug 18, 2024
Cannot compute gradient with `ArrayPartition` that holds containers of different types Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

JuliaDiff/ForwardDiff.jl#706 · 3 comments · Opened Jul 25, 2024
Reinterpret discards information and returns incorrect result Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#701 · 4 comments · Opened May 21, 2024
`gradient!` allocates for matrices but not for vectors Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#698 · Opened Mar 25, 2024
DiffResults objects are not re-aliased properly Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 42/100

JuliaDiff/ForwardDiff.jl#696 · 3 comments · Opened Mar 15, 2024
LoadError: ArgumentError: Package AdaptStaticArraysCoreExt does not have Adapt in its dependencies: Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

JuliaDiff/ForwardDiff.jl#691 · 2 comments · Opened Mar 9, 2024
Bug (NaNs) when differentiating eigenvectors of Symmetric matrices Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#684 · 1 comment · Opened Jan 18, 2024
Document internals? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#682 · 1 comment · 3 reactions · Opened Jan 3, 2024
Support derivative(f, ::Complex) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#675 · 2 comments · 1 reaction · Opened Nov 24, 2023
Symbolics.jl compatibility Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#674 · 1 comment · Opened Nov 22, 2023
`ForwardDiff.jacobian` throws error for `fft` Open

Difficulty 4/5 3-5 days Newbie friendliness 28/100

JuliaDiff/ForwardDiff.jl#670 · 1 comment · Opened Nov 1, 2023
Implement gammalogccdf for ForwardDiff Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#666 · 1 comment · Opened Sep 20, 2023
Implement hessian! for scalar x Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#661 · Opened Aug 16, 2023
Cancellation with sparse arrays Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#658 · 5 comments · Opened Aug 8, 2023
`construct_seeds` for types where `typeof(one(T)) !=T` is broken Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#651 · 1 comment · Opened Jun 7, 2023
`NaNMath` (and `SpecialFunctions`) as extensions? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

JuliaDiff/ForwardDiff.jl#648 · 5 comments · Opened May 13, 2023
Rationals and Modulo Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#647 · Opened May 12, 2023
Error differentiating through complex power due to isinteger Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

JuliaDiff/ForwardDiff.jl#637 · 6 comments · Opened Mar 20, 2023
One call to get f(x) and f'(x)? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

JuliaDiff/ForwardDiff.jl#630 · 2 comments · 1 reaction · Opened Mar 3, 2023
one(::type(Dual)) Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

JuliaDiff/ForwardDiff.jl#624 · 1 comment · Opened Feb 14, 2023
Is this code a supported use? (single-pass value and derivative) Open

Difficulty 4/5 3-5 days Newbie friendliness 32/100

JuliaDiff/ForwardDiff.jl#610 · 6 comments · Opened Nov 24, 2022
#481 `iszero` workaround Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

JuliaDiff/ForwardDiff.jl#607 · 10 comments · Opened Nov 14, 2022
#481 possibly broke `ishermitian` Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDiff/ForwardDiff.jl#606 · 16 comments · Opened Nov 11, 2022
Error with bunchkaufman factorization Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

JuliaDiff/ForwardDiff.jl#602 · 4 comments · Opened Oct 3, 2022

JuliaDiff/ForwardDiff.jl

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