Fix example command in sandbox/rl_trainer/main.py

[daniellepintz]

The current example config does not work because it runs on slurm. Fixing to a command that does work and runs locally.

[felipemello1]

hey, happy to approve, but can you help me understand why 1.7b would run but 30b wouldnt?

[halflearned]

hey I saw this issue today. imo this isn't the right fix. the problem is that the qwen3_32b.yaml file contains the attributes hosts:1, which assumes a scheduler/remote host. just removing those lines from that file fixed the issue for me when running locally.

[JenniferWang]

See the comments above

[daniellepintz]

yes indeed the problem is qwen3_32b.yaml is configured to use slurm. do we want to change this?

[JenniferWang]

@felipemello1 @daniellepintz this is, generally speaking a UX problem -- what's our default examples to be based on? Local DevGPU with 8 card?

On the other hand, for now, we can certainly augment the example run command with different mode override.

Local DevGPU: 
python -m tests.sandbox.rl_trainer.main --config apps/grpo/qwen3_1_7b.yaml

Slurm: 
python -m tests.sandbox.rl_trainer.main --config apps/grpo/qwen3_1_7b.yaml provisioner.launcher='slurm' 

MAST:
...

Given that the comment is accurate. I suggest closing the PR and include the improvement in the UX work.