MeasureTransport / MeasureTransport/MParT
`PermutationMap`
Nobody has claimed this yet.
- Dominant language
- C++
- Stars
- 18
- Forks
- 5
- PR merge metrics
- No merged PRs in 30d
Description
I'd like a map that allows me to shuffle coordinates. This obviously can be done with an Affine map, but that's a frustrating amount of BLAS overhead for something that's far more "embarrassingly parallel". If we have permutation map $S(x)=Px$ for some matrix $P$, of course, we have
$$S^{-1}(x)=P^\top x$$
$$\log|\nabla S(x)| = \log|P| = 0$$
$$\nabla_x\log|\nabla S(x)| = 0$$
Of course, similar to AffineMap, we don't include the permutation in the varied parameters and thus there are no coefficients.
This would be a great straightforward contribution for someone getting started with the codebase.
Contributor guide
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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 AffineMap and reviewing how its inverse and log-Jacobian operations are implemented. Add the corresponding PermutationMap behavior described in the issue, keeping the permutation out of the varied parameters and coefficients; done means coordinate shuffling works without the unnecessary affine BLAS overhead.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- backend
- Issue type
- Feature
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100