The ultimate guide to multi-harness RL

Lewis from Hugging Face's post-training team has published a comprehensive guide on training open models within various coding harnesses. The guide details their solution using open-source libraries such as TRL and the Harbor framework for RL environments. This resource aims to help users optimize performance with their custom harnesses and open models, and the team welcomes feedback on their work.

This guide offers a recipe for optimizing open models across different custom coding harnesses, unlike previous approaches that lacked a unified solution.