Dependency issue when trying to setup from scratch
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Description
ERROR: Cannot install sglang and sglang[srt]==0.4.9.post2 because these package versions have conflicting dependencies.
The conflict is caused by:
sglang[srt] 0.4.9.post2 depends on torch==2.7.1; extra == "srt"
flashinfer-python 0.2.7.post1 depends on torch
flashinfer-python 0.2.7.post1 depends on torch==2.8.*
To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip to attempt to solve the dependency conflict
After running:
cd $BASE_DIR
git clone https://github.com/sgl-project/sglang.git --branch v0.4.9.post2 --depth 1
cd $BASE_DIR/sglang/
micromamba run -n slime pip -v install -e "python[all]"
# TODO: change to pip install sglang-router after it has a new release
micromamba run -n slime pip install sglang-router --force-reinstall
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
Re-run the micromamba and pip commands shown in the issue from a clean environment. Trace the requested sglang and sglang-router versions and their torch requirements to identify a compatible resolution. Done means the from-scratch setup completes without the torch 2.7.1 versus 2.8.* conflict.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python, pytorch
- Domain
- build-system, machine-learning
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 48/100