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Yuhua Zhou

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#machine learning Preprint Sep 2026

OPTS-TTPO: Enhancing Finite-Sample Policy-Gradient Learning with Tree Search

The policy-gradient theorem gives the exact gradient under the current policy, but finite on-policy samples may miss rare high-return trajectories. We study whether tree search improves their coverage within a fixed budget while controlling gradient bias. We introduce On-Policy Parallel Tree Search (OPTS) and Tree Traj...

Jun-Yu Lu, Shi-Chao Weng, Zhi-Qiang Wang et al. · 0 citations
#machine learning Preprint Sep 2026

Positions Are Not Facts: The Mismatch Between KV Caches and Memory

When a fact changes, how should a language model update the history stored in its key-value (KV) cache? Hiding the old record is cheap, but it may still contain needed details or answer questions about the past. We compare hiding whole records, hiding only replaced values, and deleting old text and recomputing the cach...

Chang-Hai Zhou, Yu-Hua Zhou, Shi-Yang Zhang et al. · 0 citations
Book Open access Aug 2026

Caduceus: MoE Foundation Models for Unifying Biological and Natural Language

This paper introduces Caduceus, a family of MoE-enhanced foundation models built with a hierarchical pre-training paradigm to jointly integrate biological and natural language, and incorporates a multi-task instruction tuning phase, enabling robust protein parsing and natural language question answering.

Ming-Ze Yin, Yiheng Zhu, Jialu Wu et al. · 1 citation
Jul 2026

LongStraw: Long-Context RL Beyond 2M Tokens under a Fixed GPU Budget

This work presents LongStraw, an objective-aware, architecture-aware system for resident-state virtualization, response replay, and distributed-gradient execution that bounds the live training graph by the response suffix while reusing the expensive prompt computation across the complete GRPO group.

Changhai Zhou, Kieran Liu, Yuhua Zhou et al. · 2 citations
#natural language process... Book Open access Aug 2026

Caduceus: MoE Foundation Models for Unifying Biological and Natural Language

This paper introduces Caduceus, a family of MoE-enhanced foundation models built with a hierarchical pre-training paradigm to jointly integrate biological and natural language, and incorporates a multi-task instruction tuning phase, enabling robust protein parsing and natural language question answering.

Mingze Yin, Yiheng Zhu, Jialu Wu et al. · 0 citations

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