[Tiny Feat] add rollout_sglang_jax_log_level in RolloutConfig

[aolemila]

Resolves #1040.

python3 scripts/grpo_demo_llama3_qwen2.py --num-batches 2 --num-test-batches 1 --root-dir=/home/gcpuser/aolemila --rollout-engine sglang_jax --sglang-jax-log-level debug

It's a good idea to open an issue first for discussion.

Reference

Colab Notebook

Checklist

• I have added all the necessary unit tests for my change.
• I have verified that my change does not break existing code and all unit tests pass.
• I have added all appropriate doc-strings/documentation.
• My PR is based on the latest changes of the main branch (if unsure, rebase the code).
• I have signed the Contributor License Agreement.
• I have followed Contribution Guidelines.

[gemini-code-assist]

Summary of Changes

Hello @aolemila, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new configuration option to control the logging verbosity of the Sglang JAX rollout engine. By adding a log_level parameter to relevant configuration classes, users can now specify the desired logging output, improving debugging and operational visibility without altering core logic.

Highlights

• SglangJaxConfig Update: Introduced a new log_level field with a default value of "info" to the SglangJaxConfig class, allowing configuration of logging verbosity for the Sglang JAX engine.
• RolloutConfig Enhancement: Added rollout_sglang_jax_log_level to the RolloutConfig class, providing a dedicated configuration option for the Sglang JAX rollout engine's logging level.
• SglangJaxSampler Integration: Modified the SglangJaxSampler initialization to accept and utilize the newly introduced log_level from the RolloutConfig, ensuring the configured logging level is applied.

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Changelog

• tunix/generate/sglang_jax_sampler.py
  • Added log_level: str = "info" to the SglangJaxConfig class.
  • Mapped the config.log_level to args["log_level"] within the _sglang_jax_config method.
• tunix/rl/rollout/base_rollout.py
  • Added rollout_sglang_jax_log_level: str = "info" to the RolloutConfig class.
• tunix/rl/rollout/sglang_jax_rollout.py
  • Passed rollout_config.rollout_sglang_jax_log_level as the log_level argument to the SglangJaxSampler constructor.

Activity

• The pull request aims to resolve issue [Tiny Feat] make log_level be configurable #1040.
• The author has provided a checklist for contribution guidelines, indicating adherence to project standards.
• No specific review comments or discussions have been provided in the context.

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Code Review

This pull request introduces a new configuration option, rollout_sglang_jax_log_level, to control the logging verbosity of the SGLang JAX rollout engine. The change is well-implemented, correctly passing the setting from RolloutConfig through to the SglangJaxSampler. The code is clean and follows existing patterns. I have one minor suggestion to improve the clarity of a comment, in line with the repository's style guide.