Hacker Remix

Uv and Ray: Pain-Free Python Dependencies in Clusters

38 points by robertnishihara 11 hours ago | 9 comments

lz400 9 hours ago

Unfortunately uv is usually insufficient for certain ML deployments in Python. It's a real pain to install pytorch/CUDA with all the necessary drivers and C++ dependencies so people tend to fall back to conda.

Any modern tips / life hacks for this situation?

rsfern 6 hours ago

Are there particular libraries that make your setup difficult? I just manually set the index and source following the docs (didn’t know about the auto backend feature) and pin a specific version if I really have to with `uv add “torch==2.4”`. This works pretty well for me for projects that use dgl, which heavily uses C++ extensions and can be pretty finicky about working with particular versions

This is in a conventional HPC environment, and I’ve found it way better than conda since the dependency solves are so much faster and I no longer experience PyTorch silently getting downgraded to cpu version of I install a new library. Maybe I’ve been using conda poorly though?

Kydlaw 7 hours ago

You should give a try to https://pixi.sh/latest/ (I am not involve in the project).

They are a little more focus on scientific computing than uv, which is more general. They might be a better option in your case.

devjab 8 hours ago

https://docs.astral.sh/uv/guides/integration/pytorch/#automa...

doesn't work?

lz400 8 hours ago

the problem is that you still need to install all the low level stuff manually, conda does it automatically

gcarvalho 7 hours ago

I was pleasantly surprised to try the guide out and see that it just worked:

    λ uv venv && uv pip install torch --torch-backend=auto
    λ uv run python -c 'import torch; print(torch.cuda.is_available())'
    True

This is on Debian stable, and I don't remember doing any special setup other than installing the proprietary nvidia driver.

pcwelder 6 hours ago

This script has been sufficient for me to configure gpu drivers on fresh ubuntu machines. It's just uv add torch after this.

https://cloud.google.com/compute/docs/gpus/install-drivers-g... (NOTE: not gcloud specific)

miohtama 7 hours ago

Would it be possible to use Docker to manage native dependencies?

jessekv 9 hours ago

It would be a fun callback if the demo was a factorial server:

https://joearms.github.io/#2013-11-21%20My%20favorite%20Erla...