patrick-kidger / patrick-kidger/diffrax
Local interpolations: make `solution.derivative` physically meaningful?
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refactor
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- Python
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Description
At the moment it is just the same as a jax.jvp of solution.evaluate; in particular it is the derivative of the numerical spline approximation; not an approximation to the true derivative. The latter might be more helpful? Not sure.
Contributor guide
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 tracing how solution.derivative currently relates to solution.evaluate and the jax.jvp behavior described in the issue. Compare the numerical spline derivative with the intended true derivative, then define the expected semantics and tests before changing anything.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- backend
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 20/100