Author

Zhenqing Ling

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Preprint Aug 2026

Beyond Solvability: Task Learnability as a Static Prior for LLM RL Post-Training

TrajVal, a lightweight probe-based estimator that approximates per-task learnability from a short probe run and two endpoint evaluations, is proposed and it is found that learnability is reproducible across independently sampled training contexts and predictive of downstream utility.

Ting Zhou, Zhenqing Ling, Daoyuan Chen et al. · 0 citations