The Qwen3-4B harness reproduction is a working prototype, not a full paper copy
ben_burtenshaw · x · 2026-07-23
A follow-up note on the harness reproduction clarifies what the setup is and is not.
- It is not a full reproduction of the paper, but a working recreation of the experimental mechanism for tinkering.
- The key ideas are to train only on short TREC contexts, keep long inputs outside the main context, learn root decomposition with RL, and then evaluate unchanged on longer or cross-domain inputs.
- The author also notes simplifying assumptions: a smaller model, a frozen subcaller, shorter strategy training, and lower subcall budgets.
- Trajectory-similarity measurements from the paper have not been computed yet.
Related event: Developer Creates Runnable RL Harness Prototype with Qwen3-4B(2 posts)→
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