Author

Sihang Jiang

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Preprint Jun 2026

From Outcomes to Actions: Leveraging Hindsight for Long-Horizon Language Agent Training

A novel policy gradient method is introduced, Hindsight Policy Optimization (HPO), that projects both the current policy distribution and the hindsight distribution into an intent space and extracts low-variance learning signals from the Wasserstein distance between them.

Zishang Jiang, Tingyun Li, Jinyi Han et al. · 0 citations

Preprint Jul 2026

From Isolated Tasks to Structured Capabilities: A Multilayer Taxonomy for Large Language Models

A multi-layer taxonomy of 14 capability domains and 91 subskills across Primitive, Constructed, and Integrative layers is introduced and supports research organization, coverage audits, evaluation interpretation, and testable hypotheses for diagnosis, training, and transfer.

Shixin Fang, Jiachen Wo, Wenjuan Qin et al. · 0 citations