[BUG] Blackwell FMHA fwd kernel doesn't output LSE
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bug
inactive-30d
inactive-90d
- Dominant language
- C++
- Stars
- 10.5k
- Forks
- 2.1k
- Avg merge
- 3d 11h
- Merged PRs (30d)
- 7
Description
Describe the bug
ptr_LSE is never used in the fwd kernel.
Contributor guide
No contributing guide indexed for this repository
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
No file or test is named in the issue. Start by locating the Blackwell FMHA forward kernel and tracing the ptr_LSE parameter; verify the forward path's LSE output against the expected behavior. Done means ptr_LSE is used and receives the correct LSE values.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- machine-learning
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100