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Merged
gdalle merged 12 commits into from
May 6, 2026
Merged

feat: add support for HyperHessian backend #940

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27eeb53
WIP: Add support for HyperHessian backend
Dec 3, 2025
01af3af
only run HyperHessians tests
Dec 3, 2025
d0163d5
less tests
Dec 3, 2025
48832e2
also have source for HyperHessians
Dec 3, 2025
86e9d72
package is now registerd
KristofferC Dec 12, 2025
e25ee2f
address review comments
KristofferC Dec 30, 2025
d516e7d
updates
KristofferC Jan 20, 2026
8d6dc63
fixups and use ADTypes HyperHessians
KristofferC Apr 23, 2026
c6c9fe0
bump compat for ADTypes
KristofferC Apr 27, 2026
a3b673d
Add JET to test env
gdalle May 6, 2026
f7bc35a
Merge remote-tracking branch 'origin/main' into pr/KristofferC/940
gdalle May 6, 2026
6374546
Docs fixes and version bump
gdalle May 6, 2026
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1 change: 1 addition & 0 deletions .github/workflows/Test.yml
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Expand Up @@ -100,6 +100,7 @@ jobs:
- FiniteDifferences
- ForwardDiff
- GTPSA
- HyperHessians
- Mooncake
- Mooncake-old
- PolyesterForwardDiff
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8 changes: 7 additions & 1 deletion DifferentiationInterface/CHANGELOG.md
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Expand Up @@ -5,7 +5,13 @@ All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [Unreleased](https://github.com/JuliaDiff/DifferentiationInterface.jl/compare/DifferentiationInterface-v0.7.17...main)
## [Unreleased](https://github.com/JuliaDiff/DifferentiationInterface.jl/compare/DifferentiationInterface-v0.7.18...main)

## [0.7.18](https://github.com/JuliaDiff/DifferentiationInterface.jl/compare/DifferentiationInterface-v0.7.17...DifferentiationInterface-v0.7.18)

### Added

- Add support for HyperHessians backend ([#940](https://github.com/JuliaDiff/DifferentiationInterface.jl/pull/940))

## [0.7.17](https://github.com/JuliaDiff/DifferentiationInterface.jl/compare/DifferentiationInterface-v0.7.16...DifferentiationInterface-v0.7.17)

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7 changes: 5 additions & 2 deletions DifferentiationInterface/Project.toml
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@@ -1,6 +1,6 @@
name = "DifferentiationInterface"
uuid = "a0c0ee7d-e4b9-4e03-894e-1c5f64a51d63"
version = "0.7.17"
version = "0.7.18"
authors = ["Guillaume Dalle", "Adrian Hill"]

[deps]
Expand All @@ -15,6 +15,7 @@ Diffractor = "9f5e2b26-1114-432f-b630-d3fe2085c51c"
Enzyme = "7da242da-08ed-463a-9acd-ee780be4f1d9"
EnzymeCore = "f151be2c-9106-41f4-ab19-57ee4f262869"
FastDifferentiation = "eb9bf01b-bf85-4b60-bf87-ee5de06c00be"
HyperHessians = "06b494a0-c8e0-40cc-ad32-d99506a00a6c"
Comment thread
gdalle marked this conversation as resolved.
FiniteDiff = "6a86dc24-6348-571c-b903-95158fe2bd41"
FiniteDifferences = "26cc04aa-876d-5657-8c51-4c34ba976000"
ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
Expand All @@ -40,6 +41,7 @@ DifferentiationInterfaceFiniteDiffExt = "FiniteDiff"
DifferentiationInterfaceFiniteDifferencesExt = "FiniteDifferences"
DifferentiationInterfaceForwardDiffExt = ["ForwardDiff", "DiffResults"]
DifferentiationInterfaceGPUArraysCoreExt = ["GPUArraysCore", "Adapt"]
DifferentiationInterfaceHyperHessiansExt = "HyperHessians"
DifferentiationInterfaceGTPSAExt = "GTPSA"
DifferentiationInterfaceMooncakeExt = "Mooncake"
DifferentiationInterfacePolyesterForwardDiffExt = [
Expand All @@ -58,7 +60,7 @@ DifferentiationInterfaceZygoteExt = ["Zygote", "ForwardDiff"]

[compat]
Adapt = "4.5.0"
ADTypes = "1.18.0"
ADTypes = "1.22.0"
ChainRulesCore = "1.23.0"
DiffResults = "1.1.0"
Diffractor = "=0.2.6"
Expand All @@ -70,6 +72,7 @@ FiniteDifferences = "0.12.31"
ForwardDiff = "0.10.36,1"
GPUArraysCore = "0.2"
GTPSA = "1.4.0"
HyperHessians = "0.2"
LinearAlgebra = "1"
Mooncake = "0.5.1"
PolyesterForwardDiff = "0.1.2"
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1 change: 1 addition & 0 deletions DifferentiationInterface/README.md
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Expand Up @@ -34,6 +34,7 @@ We support the following backends defined by [ADTypes.jl](https://github.com/Sci
- [FiniteDiff.jl](https://github.com/JuliaDiff/FiniteDiff.jl)
- [FiniteDifferences.jl](https://github.com/JuliaDiff/FiniteDifferences.jl)
- [ForwardDiff.jl](https://github.com/JuliaDiff/ForwardDiff.jl)
- [HyperHessians.jl](https://github.com/KristofferC/HyperHessians.jl)
- [GTPSA.jl](https://github.com/bmad-sim/GTPSA.jl)
- [Mooncake.jl](https://github.com/chalk-lab/Mooncake.jl)
- [PolyesterForwardDiff.jl](https://github.com/JuliaDiff/PolyesterForwardDiff.jl)
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2 changes: 2 additions & 0 deletions DifferentiationInterface/docs/Project.toml
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Expand Up @@ -6,6 +6,7 @@ Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
DocumenterInterLinks = "d12716ef-a0f6-4df4-a9f1-a5a34e75c656"
FiniteDiff = "6a86dc24-6348-571c-b903-95158fe2bd41"
ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
HyperHessians = "06b494a0-c8e0-40cc-ad32-d99506a00a6c"
Markdown = "d6f4376e-aef5-505a-96c1-9c027394607a"
PrettyTables = "08abe8d2-0d0c-5749-adfa-8a2ac140af0d"
Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
Expand All @@ -21,6 +22,7 @@ Documenter = "1"
DocumenterInterLinks = "1.1"
FiniteDiff = "2.29"
ForwardDiff = "1.2.2"
HyperHessians = "0.2"
PrettyTables = "3.1"
SparseConnectivityTracer = "1.1.2"
SparseMatrixColorings = "0.4.23"
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7 changes: 5 additions & 2 deletions DifferentiationInterface/docs/src/explanation/backends.md
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Expand Up @@ -12,6 +12,7 @@ We support the following dense backend choices from [ADTypes.jl](https://github.
- [`AutoFiniteDifferences`](@extref ADTypes.AutoFiniteDifferences)
- [`AutoForwardDiff`](@extref ADTypes.AutoForwardDiff)
- [`AutoGTPSA`](@extref ADTypes.AutoGTPSA)
- [`AutoHyperHessians`](@extref ADTypes.AutoHyperHessians)
- [`AutoMooncake`](@extref ADTypes.AutoMooncake) and [`AutoMooncakeForward`](@extref ADTypes.AutoMooncake) (the latter is experimental)
- [`AutoPolyesterForwardDiff`](@extref ADTypes.AutoPolyesterForwardDiff)
- [`AutoReverseDiff`](@extref ADTypes.AutoReverseDiff)
Expand All @@ -32,11 +33,11 @@ In practice, many AD backends have custom implementations for high-level operato
!!! details

In the rough summary table below,

- ✅ means that we reuse the custom implementation from the backend;
- ❌ means that a custom implementation doesn't exist, so we use our default fallbacks;
- 🔀 means it's complicated or not done yet.

| | `pf` | `pb` | `der` | `grad` | `jac` | `hess` | `hvp` | `der2` |
|:-------------------------- |:---- |:---- |:----- |:------ |:----- |:------ |:----- |:------ |
| `AutoChainRules` | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ |
Expand All @@ -48,6 +49,7 @@ In practice, many AD backends have custom implementations for high-level operato
| `AutoFiniteDifferences` | 🔀 | ❌ | ❌ | ✅ | ✅ | ❌ | ❌ | ❌ |
| `AutoForwardDiff` | ✅ | ❌ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
| `AutoGTPSA` | ✅ | ❌ | ❌ | ✅ | ✅ | ✅ | ✅ | ✅ |
| `AutoHyperHessians` | ❌ | ❌ | ❌ | ❌ | ❌ | ✅ | ✅ | ✅ |
| `AutoMooncake` | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ |
| `AutoMooncakeForward` | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ |
| `AutoPolyesterForwardDiff` | 🔀 | ❌ | 🔀 | ✅ | ✅ | 🔀 | 🔀 | 🔀 |
Expand All @@ -69,6 +71,7 @@ Moreover, each context type is supported by a specific subset of backends:
| `AutoFiniteDifferences` | ✅ | ✅ |
| `AutoForwardDiff` | ✅ | ✅ |
| `AutoGTPSA` | ✅ | ❌ |
| `AutoHyperHessians` | ✅ | ✅ |
| `AutoMooncake` | ✅ | ✅ |
| `AutoMooncakeForward` | ✅ | ✅ |
| `AutoPolyesterForwardDiff` | ✅ | ✅ |
Expand Down
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