Comments (7)
devmotion
commented on September 23, 2024
Can you explain the motivation for it? I assumed that typically the main idea is to not construct the Jacobian at all but directly compute Jacobian-vector products. But here you just store the Jacobian?
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devmotion
commented on September 23, 2024
Oh wait, it's actually a lazy operator that is stored? Then you could just define mul!, couldn't you?
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gdalle
commented on September 23, 2024
The motivation was to use this lazy Jacobian as a LinearOperator (in the sense of LinearOperators.jl) in our package ImplicitDifferentiation.jl. It's easier to define mul! on a struct, and I needed to know the array order statically in order to write type-stable code
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gdalle
commented on September 23, 2024
But I eventually gave up because of #83
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oxinabox
commented on September 23, 2024
Isn't this what our lazy_jacobian function already returns?
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gdalle
commented on September 23, 2024
Maybe but I needed the additional flattening step and the existence of a mul! method because of the Krylov solver we were using.
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gdalle
commented on September 23, 2024
Closing in favor of #114
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Related Issues (20)
- Only support tuples and not single inputs/outputs HOT 7
- Use DocStringExtensions.jl
- Fix type instabilities HOT 7
- Add JET tests for linting and type instabilities
- AbstractDifferentiation stable docs 404 HOT 1
- Lazy jacobians could implement more of the LinearAlgebra interface
- New version timeline HOT 11
- Inconsistency in value_and_pushforward_function vs value_and_pullback_function outputs HOT 6
- Regression in type inferrability HOT 5
- Get rid of ugly macro? HOT 6
- `value_and_pullback_function` doesn't do what its docstring says HOT 3
- Configurable ForwardDiff tag
- Maybe AbstractDifferentiation should shrink to a collection of names? HOT 1
- Comparison with DifferentiationInterface.jl HOT 2
- Handling of thunks and tangents HOT 1
- Define a function for v' J v
- Expose tests through public API in src HOT 2
- Add docs for how to implement API as an AD HOT 2
- API Docs for end-users HOT 5
- `pushforward_function` and `pullback_function` are confused by tuples vs single input
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