NVIDIA-NeMo / NVIDIA-NeMo/Curator
Curator pip install: flash-attn build issue: ModuleNotFoundError: No module named 'torch'
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bug
community-request
waiting-on-maintainers
- Dominant language
- Python
- Stars
- 1.8k
- Forks
- 328
- Avg merge
- 4d 5h
- Merged PRs (30d)
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Description
This is expected behavior for the OPTIONAL pip job!
The error ModuleNotFoundError: No module named 'torch' is the known flash-attn build issue:
- flash-attn's setup.py tries to import torch during build
- But pip can't install build-time dependencies first
pip job fails , while the required uv job passes (uv handles build deps via lockfile)
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 with the optional pip job configuration and its flash-attn installation step; compare it with the required uv job, which passes. Determine whether the job should tolerate this known ModuleNotFoundError or handle the build-time dependency differently. Done when the expected behavior is documented or the optional pip job completes without the reported error.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- build-system, ci-cd
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Quiet
- Clarity
- Needs clarification
- Newbie friendliness
- 38/100