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Hengyi Cai

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#artificial intelligence Preprint Sep 2026

SWRouter: Similarity-Contractive Window Routing for Multi-Turn Large Language Model Conversations

This paper proposes SWRouter, a Similarity-Contractive Window Router for multi-turn large language model routing that combines a similarity-based context segmentation mechanism for prompt construction with a dual-metric evaluation framework that decouples construction accuracy from router performance.

Yu Wang, Yuchen Li, Rui Kong et al. · 0 citations
#artificial intelligence Preprint Feb 2026

Not All Preferences Deserve Gradients: Understanding Gradient Utility in Offline Reasoning Alignment

SAGE (Stability-Aware Gradient Efficiency), which maintains difficulty-stratified candidate pools refreshed during training and selects pairs within each pool by a forward-pass signal-to-curvature score, outperforms full-data and size-matched baselines while producing substantially smoother optimization trajectories.

Hui Wu, Hengyi Cai, Jin-Man Zhao et al. · 0 citations
Preprint Aug 2026

TurnSight: Turn-Level Hindsight Self-Distillation for Tool-Integrated Reasoning

TurnSight is proposed, a turn-level hindsight self-distillation framework that derives supervision directly from execution-conditioned hindsight and selects reliable supervision through cross-horizon directional agreement.

Changle Qu, Sun-Hao Dai, Hengyi Cai et al. · 0 citations

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