specialized triangular inverse
Open
Nobody has claimed this yet.
feature
good first issue
new function
- Dominant language
- C++
- Stars
- 839
- Forks
- 220
- Avg merge
- 2d 4h
- Merged PRs (30d)
- 14
Description
Description
We should have inv_tri_low(x) = inverse(x) for x a lower triangular matrix.
It's for more efficiency and simpler derivatives.
Current Version:
v3.2.0
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 locating the existing inverse operation and triangular-matrix utilities in the Stan Math codebase. Use inv_tri_low(x) for lower triangular matrices, then verify that the specialized operation provides the intended efficiency and simpler derivatives.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- backend, performance
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100