JuliaDiff/ChainRulesCore.jl

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AD-backend agnostic system defining custom forward and reverse mode rules. This is the light weight core to allow you to define rules for your functions in your packages, without depending on any particular AD system.

Stars: 267
Forks: 66
Open beginner issues: 0
Indexed issues: 112

Dominant language: Julia
License: No license data
Last GitHub push: Jun 22, 2026
Latest indexed: Sep 18, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue help wanted
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

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112 open issues indexed

Write better docs on what types a pullback should accept. Open

documentation

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

JuliaDiff/ChainRulesCore.jl#409 · Opened Jul 23, 2021
`ProjectTo(::AbstractArray)` does not infer Open

ProjectTo

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

JuliaDiff/ChainRulesCore.jl#407 · 3 comments · Opened Jul 22, 2021
Handling structs without the default constructor via `Expr(:new,...` ? Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

JuliaDiff/ChainRulesCore.jl#406 · 3 comments · Opened Jul 22, 2021
`backing` doesn't allow for undef fields Open

good first issue Structural Tangent

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

JuliaDiff/ChainRulesCore.jl#392 · 1 comment · Opened Jul 7, 2021
Consider handling rrules for kwargs differently? Open

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

JuliaDiff/ChainRulesCore.jl#384 · 2 comments · Opened Jun 27, 2021
Typed thunks? Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

JuliaDiff/ChainRulesCore.jl#373 · 4 comments · Opened Jun 19, 2021
5-arg mul! for all AbstractTangents Open

LinearOperators

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

JuliaDiff/ChainRulesCore.jl#355 · 2 reactions · Opened May 24, 2021
Aliased differentials and Inplace Accumulation Open

bug design inplace accumulation

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

JuliaDiff/ChainRulesCore.jl#350 · 2 comments · Opened May 11, 2021
Overload `add!!(::AbstractArray, iterator)`? Open

design inplace accumulation

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

JuliaDiff/ChainRulesCore.jl#349 · Opened May 7, 2021
Destination flipping for `add!!(x, y)` Open

inplace accumulation

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

JuliaDiff/ChainRulesCore.jl#346 · 1 comment · Opened May 4, 2021
Is `add!!(::Diagonal, ::Array)` correct? Open

inplace accumulation

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

JuliaDiff/ChainRulesCore.jl#345 · Opened May 4, 2021
Explain the Abstract Primals Problem Open

documentation

JuliaDiff/ChainRulesCore.jl#343 · 11 comments · 1 reaction · 1 assignee · Opened May 4, 2021
Explicit examples on how to derive pushfowards and pullbacks Open

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

JuliaDiff/ChainRulesCore.jl#338 · 1 reaction · Opened Apr 27, 2021
+(::AbstractThunk, ::InplaceableThunk) should use inplace Open

good first issue inplace accumulation

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

JuliaDiff/ChainRulesCore.jl#297 · Opened Feb 8, 2021
Use physics package for simpler equations Open

documentation

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

JuliaDiff/ChainRulesCore.jl#288 · 2 comments · 1 reaction · Opened Jan 25, 2021
summing many differentials (varadic +) Open

enhancement inplace accumulation

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

JuliaDiff/ChainRulesCore.jl#275 · 1 comment · Opened Jan 12, 2021
Helper for creating `InplaceableThunks` when it is just broadcast + Open

enhancement inplace accumulation rule definition helper

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

JuliaDiff/ChainRulesCore.jl#274 · 6 comments · 1 reaction · Opened Jan 11, 2021
Extend scalar_rule to handle broadcast Open

rule definition helper speculative

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

JuliaDiff/ChainRulesCore.jl#271 · 6 comments · 1 reaction · Opened Dec 29, 2020
Implement getindex and view for AbstractZero Open

good first issue LinearOperators

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

JuliaDiff/ChainRulesCore.jl#269 · 2 comments · 1 reaction · Opened Dec 24, 2020
Tracked DoesNotExist: so you know where it came from Open

debugging enhancement

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

JuliaDiff/ChainRulesCore.jl#263 · 2 comments · 4 reactions · Opened Dec 14, 2020
Ability to identify rules that always return AbstractZero Open

design rule definition helper

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

JuliaDiff/ChainRulesCore.jl#248 · 2 comments · Opened Nov 13, 2020
Trait-based dispatch Open

design pending-clear-need speculative

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

JuliaDiff/ChainRulesCore.jl#247 · 4 comments · 1 reaction · Opened Oct 31, 2020
Make AbstractZero play nice like Missing and Nothing Open

design enhancement help wanted

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

JuliaDiff/ChainRulesCore.jl#244 · Opened Oct 30, 2020
mutating calls Open

mutability

Difficulty 5/5 Over a week Newbie friendliness 20/100

JuliaDiff/ChainRulesCore.jl#242 · 8 comments · 1 reaction · Opened Oct 29, 2020
getindex on Composites doesn't alway return Zero() for not found Open

Structural Tangent

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

JuliaDiff/ChainRulesCore.jl#238 · 1 reaction · Opened Oct 19, 2020
Make inplace accumulation support Hermitian and Symmetric matrices Open

inplace accumulation

Difficulty 5/5 Over a week Newbie friendliness 28/100

JuliaDiff/ChainRulesCore.jl#236 · Opened Oct 16, 2020
`getindex` and `iterate` on `Composite` should unthunk Open

enhancement good first issue Structural Tangent

Difficulty 3/5 1-2 days Newbie friendliness 25/100

JuliaDiff/ChainRulesCore.jl#233 · Opened Oct 15, 2020
Make `==` , `hash` not depend on canonicalize? Open

Structural Tangent

Difficulty 5/5 Over a week Newbie friendliness 20/100

JuliaDiff/ChainRulesCore.jl#231 · Opened Oct 14, 2020
Documentation on default arguments Open

documentation

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

JuliaDiff/ChainRulesCore.jl#223 · 1 reaction · Opened Sep 25, 2020
Composite clarification Open

design documentation Structural Tangent

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

JuliaDiff/ChainRulesCore.jl#221 · 2 comments · Opened Sep 22, 2020
Defined dot on Composite Open

LinearOperators pending-clear-need Structural Tangent

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

JuliaDiff/ChainRulesCore.jl#220 · Opened Sep 14, 2020
Seperate internal API from Dev Tools in docs? Open

documentation

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

JuliaDiff/ChainRulesCore.jl#206 · 2 reactions · Opened Aug 21, 2020
Better error message when using @scalar_rule on functors/closures Open

rule definition helper

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

JuliaDiff/ChainRulesCore.jl#203 · 2 comments · 1 reaction · Opened Aug 6, 2020
Composite constructors Open

design Structural Tangent

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

JuliaDiff/ChainRulesCore.jl#198 · Opened Jul 22, 2020
Differential for AbstractDict Open

enhancement good first issue

Difficulty 5/5 Over a week Newbie friendliness 20/100

JuliaDiff/ChainRulesCore.jl#186 · Opened Jul 8, 2020
Approximate Equality of Differentials Open

enhancement good first issue

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

JuliaDiff/ChainRulesCore.jl#184 · 1 comment · 1 reaction · Opened Jul 7, 2020
RFC: Rules for real-to-complex and complex-to-real functions Open

Complex Differentiation

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

JuliaDiff/ChainRulesCore.jl#176 · 2 comments · 2 reactions · Opened Jun 25, 2020
Custom Covector Wrapper Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

JuliaDiff/ChainRulesCore.jl#165 · 1 comment · Opened May 25, 2020
Tangents vs Cotangents Open

help wanted speculative

Difficulty 5/5 Over a week Newbie friendliness 20/100

JuliaDiff/ChainRulesCore.jl#160 · 5 comments · Opened Apr 30, 2020
"Writing good rules" docs should comment on type constraints Open

documentation

Difficulty 1/5 Under an hour Newbie friendliness 55/100

JuliaDiff/ChainRulesCore.jl#155 · 7 comments · 1 reaction · Opened Apr 28, 2020
Make clear in docs you may need to `unthunk` the return from a pullback Open

documentation good first issue

Difficulty 1/5 Under an hour Newbie friendliness 35/100

JuliaDiff/ChainRulesCore.jl#154 · 1 comment · Opened Apr 28, 2020
Why is composite + primal test allocating 48 bytes rather than 32? Open

Structural Tangent testing

Difficulty 3/5 1-2 days Newbie friendliness 32/100

JuliaDiff/ChainRulesCore.jl#146 · 1 comment · Opened Mar 31, 2020
In Julia 1.5 use custom hints to replace debug mode? Open

enhancement

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

JuliaDiff/ChainRulesCore.jl#144 · Opened Mar 30, 2020
Export AbstractDifferential? Open

pending-clear-need

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

JuliaDiff/ChainRulesCore.jl#124 · 2 comments · Opened Jan 29, 2020
Create glossary for terms used in the project Open

documentation good first issue

JuliaDiff/ChainRulesCore.jl#117 · 7 comments · 2 reactions · 1 assignee · Opened Jan 22, 2020
Function to find the Differential type for a given primal type Open

enhancement

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

JuliaDiff/ChainRulesCore.jl#106 · 5 comments · 1 reaction · Opened Jan 19, 2020
BroadcastStyle of Differentials needs to match their primals Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

JuliaDiff/ChainRulesCore.jl#94 · 1 comment · Opened Jan 13, 2020
Support chunked frule Open

design forward-mode

Difficulty 5/5 Over a week Newbie friendliness 20/100

JuliaDiff/ChainRulesCore.jl#92 · 20 comments · Opened Jan 12, 2020
Efficient complex differentiation by structured 2x2 matrices Open

Complex Differentiation

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

JuliaDiff/ChainRulesCore.jl#87 · 8 comments · Opened Jan 10, 2020
AbstractArray or Composite? Open

Structural Tangent

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

JuliaDiff/ChainRulesCore.jl#85 · 11 comments · Opened Jan 10, 2020

JuliaDiff/ChainRulesCore.jl

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