JuliaDiff / JuliaDiff/AbstractDifferentiation.jl
`lazy_jacobian` is less generic than `pullback_function`
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bug
- Dominant language
- Julia
- Stars
- 138
- Forks
- 18
- PR merge metrics
- No merged PRs in 30d
Description
The result J of lazy_jacobian can supposedly be used as v' * J for vector-Jacobian products, but the tranpose operator doesn't work if v is, for instance, a 3D array
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by locating the definitions of lazy_jacobian and pullback_function, then reproduce the reported v' * J case with a 3D array. Compare the two interfaces and determine what behavior is expected; done means vector-Jacobian products work for that input shape or the limitation is clearly resolved.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- julia
- Domain
- backend-api-design
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 30/100