JuliaGaussianProcesses/KernelFunctions.jl

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Julia package for kernel functions for machine learning

Stars: 275
Forks: 41
Open beginner issues: 0
Indexed issues: 80

Dominant language: Julia
License: MIT
Last GitHub push: Jul 2, 2026
Latest indexed: Sep 18, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted good first issue
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

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80 open issues indexed

Future plans? Open

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

JuliaGaussianProcesses/KernelFunctions.jl#585 · 8 comments · 3 reactions · Opened Jan 13, 2026
Something like "MethodError: PeriodicTransform{Vector{Float32}} with SubArray in Zygote gradient of TransformedKernel (D_feats=1)" Open

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

JuliaGaussianProcesses/KernelFunctions.jl#573 · Opened Jun 4, 2025
ForwardDiff fails for Matern kernels when the two arguments are equal Open

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

JuliaGaussianProcesses/KernelFunctions.jl#571 · 1 reaction · Opened Apr 22, 2025
`WendlandKernel`: Compact support -> sparse kernel matrix Open

new kernel

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

JuliaGaussianProcesses/KernelFunctions.jl#550 · Opened Feb 12, 2024
Revert #528 when upstream issue is fixed Open

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

JuliaGaussianProcesses/KernelFunctions.jl#533 · 1 reaction · Opened Oct 23, 2023
Test custom rules Open

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

JuliaGaussianProcesses/KernelFunctions.jl#532 · 2 reactions · Opened Oct 17, 2023
Failures on master Open

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

JuliaGaussianProcesses/KernelFunctions.jl#526 · 5 comments · 2 reactions · Opened Sep 24, 2023
Documenting caveats of `SimpleKernel` Open

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

JuliaGaussianProcesses/KernelFunctions.jl#520 · 7 comments · Opened Jun 19, 2023
Second derivative of Matern in zero is wrong Open

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

JuliaGaussianProcesses/KernelFunctions.jl#517 · 23 comments · Opened Jun 5, 2023
Add `LazyKernelMatrix` Open

enhancement

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

JuliaGaussianProcesses/KernelFunctions.jl#514 · 1 comment · 1 reaction · Opened Jun 2, 2023
Perhaps avoid validating input dims on AbstractVector{<:AbstractVector{<:Real}} Open

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

JuliaGaussianProcesses/KernelFunctions.jl#512 · 7 comments · Opened May 30, 2023
Adding `AbstractKernel` Open

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

JuliaGaussianProcesses/KernelFunctions.jl#509 · 1 comment · Opened May 21, 2023
Sum of independent kernels Open

enhancement

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

JuliaGaussianProcesses/KernelFunctions.jl#506 · 7 comments · Opened May 9, 2023
Efficient AD for the simulation of gradients Open

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

JuliaGaussianProcesses/KernelFunctions.jl#504 · 6 comments · Opened May 2, 2023
Rename `kernelmatrix` to `kernel_matrix` Open

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

JuliaGaussianProcesses/KernelFunctions.jl#503 · 1 reaction · Opened May 2, 2023
`KernelSum` and `KernelProduct` with `Vector` of `Kernel` fails Open

bug

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

JuliaGaussianProcesses/KernelFunctions.jl#497 · 5 comments · 2 reactions · Opened Mar 28, 2023
Independent mokernel failing numerical equality test randomly Open

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

JuliaGaussianProcesses/KernelFunctions.jl#494 · 2 comments · Opened Feb 27, 2023
Define `isequal` and `==` more widely between `Kernel`s Open

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

JuliaGaussianProcesses/KernelFunctions.jl#492 · 16 comments · Opened Feb 22, 2023
Question on `ScaledKernel` Open

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

JuliaGaussianProcesses/KernelFunctions.jl#468 · 1 comment · 2 reactions · Opened Aug 24, 2022
Designing some test fakes Open

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

JuliaGaussianProcesses/KernelFunctions.jl#464 · 1 reaction · Opened Jul 15, 2022
MaternKernel AD Open

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

JuliaGaussianProcesses/KernelFunctions.jl#450 · 4 comments · Opened Apr 13, 2022
State of GPU support Open

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

JuliaGaussianProcesses/KernelFunctions.jl#431 · 3 comments · 2 reactions · Opened Jan 28, 2022
`NystromFact` need to be reparametrized Open

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

JuliaGaussianProcesses/KernelFunctions.jl#428 · 1 comment · Opened Jan 27, 2022
getindex with ColVecs Open

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

JuliaGaussianProcesses/KernelFunctions.jl#417 · 3 comments · Opened Dec 19, 2021
test_AD "normal" kernels vs MOKernels Open

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

JuliaGaussianProcesses/KernelFunctions.jl#416 · 3 comments · Opened Dec 18, 2021
Zygote AD failure for ChainTransform Open

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

JuliaGaussianProcesses/KernelFunctions.jl#415 · 2 comments · Opened Dec 18, 2021
@check_args should be a function Open

good first issue

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

JuliaGaussianProcesses/KernelFunctions.jl#404 · Opened Nov 9, 2021
Generate LaTeX for kernels Open

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

JuliaGaussianProcesses/KernelFunctions.jl#402 · 1 comment · 1 reaction · Opened Nov 8, 2021
Extract ColVecs and RowVecs Open

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

JuliaGaussianProcesses/KernelFunctions.jl#394 · 21 comments · 3 reactions · Opened Oct 29, 2021
Benchmarking! Open

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

JuliaGaussianProcesses/KernelFunctions.jl#387 · 1 comment · Opened Oct 19, 2021
Unify `kernelmatrix`, `kernelkronmat`, `kronecker_kernelmatrix`, and `kernelpdmat`? Open

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

JuliaGaussianProcesses/KernelFunctions.jl#384 · 1 reaction · Opened Oct 16, 2021
Specifying Domain of Kernels Open

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

JuliaGaussianProcesses/KernelFunctions.jl#382 · 13 comments · Opened Oct 14, 2021
Issue with Distances.jl Open

JuliaGaussianProcesses/KernelFunctions.jl#380 · 12 comments · 1 assignee · Opened Oct 8, 2021
Implementing non-stationary gibbs kernel Open

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

JuliaGaussianProcesses/KernelFunctions.jl#372 · 11 comments · 1 reaction · Opened Sep 27, 2021
Create `MOInputHeterotopic` type Open

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

JuliaGaussianProcesses/KernelFunctions.jl#358 · Opened Aug 12, 2021
Explaining ColVecs vs RowVecs in MO helpers Open

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

JuliaGaussianProcesses/KernelFunctions.jl#356 · 1 reaction · Opened Aug 11, 2021
Things to change before making a breaking release Open

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

JuliaGaussianProcesses/KernelFunctions.jl#338 · 1 comment · 2 reactions · Opened Jul 13, 2021
Fix and complete equality definitions Open

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

JuliaGaussianProcesses/KernelFunctions.jl#337 · Opened Jul 9, 2021
Revisit Multi-Output Support Naming Conventions Open

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

JuliaGaussianProcesses/KernelFunctions.jl#332 · 2 comments · Opened Jul 8, 2021
Multi-output kernel naming & consistency Open

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

JuliaGaussianProcesses/KernelFunctions.jl#328 · 9 comments · 1 reaction · Opened Jul 8, 2021
Proposal: Remove IndependentMOKernel and IntrinsicCoregionMOKernel Open

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

JuliaGaussianProcesses/KernelFunctions.jl#325 · 3 comments · Opened Jul 2, 2021
Calling kernelmatrix on a vector means its size becomes fixed (e.g. push! to it no longer works) Open

bug

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

JuliaGaussianProcesses/KernelFunctions.jl#319 · 6 comments · Opened Jun 30, 2021
Should I make the kernels in GraphKernels.jl subtypes of KernelFunctions.Kernel? Open

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

JuliaGaussianProcesses/KernelFunctions.jl#308 · 3 comments · 2 reactions · Opened Jun 23, 2021
show Open

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

JuliaGaussianProcesses/KernelFunctions.jl#307 · 2 comments · Opened Jun 23, 2021
Remove hard-coded `Vector` fields and add vectors constructors Open

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

JuliaGaussianProcesses/KernelFunctions.jl#299 · 29 comments · Opened Jun 10, 2021
Kernels for derivatives of Gaussian processes Open

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

JuliaGaussianProcesses/KernelFunctions.jl#298 · 6 comments · Opened Jun 9, 2021
LatentFactorMOKernel should be tested by the standard test suit Open

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

JuliaGaussianProcesses/KernelFunctions.jl#294 · 1 reaction · Opened Jun 2, 2021
MOKernels method that returns number of output dimensions Open

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

JuliaGaussianProcesses/KernelFunctions.jl#290 · 1 reaction · Opened May 28, 2021
Remove `set!` and `duplicate`? Open

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

JuliaGaussianProcesses/KernelFunctions.jl#287 · Opened May 8, 2021
Fix Gabor the bad boy Open

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

JuliaGaussianProcesses/KernelFunctions.jl#284 · 3 comments · 1 reaction · Opened May 5, 2021

JuliaGaussianProcesses/KernelFunctions.jl

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