Author

Yu-Da Song

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#machine learning Preprint Sep 2026

Harness Learning Enables Generalizable Test-Time Adaptation

A language-model agent is jointly defined by its model and its harness, the executable program that organizes model calls, tool use, and information flow. Because different tasks call for different ways of organizing these operations, the harness needs to be adapted using feedback from the task at hand. We introduce ha...

Alvin Zhang, Xue-Chen Liu, Zi-Xuan Wang et al. · 0 citations

Preprint Sep 2026

Tail-Likelihood Reinforcement Learning

Tail-Likelihood Reinforcement Learning (TailRL), which maximizes the log-probability of exceeding a randomly chosen reward threshold, which gives more weight to rare, high-reward rollouts and can be interpreted as a mixture of Best-of-k gradients.

Shrinivas Ramasubramanian, Daman Arora, Fahim Tajwar et al. · 1 citation