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Tianyu Fu

Tsinghua University

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Preprint Oct 2026

Cache Engineering for Agents

Large Language Model (LLM) agents can handle increasingly complex tasks, navigating long trajectories of observations and actions. As these trajectories grow, key-value (KV) cache I/O and storage become the dominant cost. Trajectories can also exceed the LLM's maximum context length, requiring control over active cache...

Tianyu Fu, Ruo-Xin Wang, Zi-Han Min et al. · 0 citations
#natural language process... Preprint Oct 2026

TokenRouter: Efficient Serving System for Token-Level LLM Routing

Large language model (LLM) routing distributes inference work across different models, advancing the cost-quality Pareto frontier of LLM serving. While coarse-grained routing at the session or query level has been widely adopted in production systems, recent algorithmic work shows that fine-grained token-level routing...

Tianyu Fu, Teng-Xuan Liu, Ruo-Xin Wang et al. · 0 citations
#machine learning Preprint Sep 2026

Improving Test-Time Scaling with Adaptive Looped Transformers

Looped transformers have demonstrated promising parameter efficiency by reusing layers for latent computation. Prior studies compare looped and non-looped models at matched parameters or per-token FLOPs. However, to the best of our knowledge, whether looping improves test-time scaling as outputs grow longer remains und...

Yi-Chen You, Tianyu Fu, Ao-Song Feng et al. · 1 citation
#artificial intelligence Preprint Nov 2025

Think-at-Hard: Dynamic Looped Transformers for Improved Reasoning

This work proposes Think-at-Hard (TaH), a looped transformer optimized for selective iteration that employs a lightweight neural decider to trigger latent iteration, only at tokens likely to be incorrect after the standard forward pass.

Tianyu Fu, Yichen You, Ze-Kai Chen et al. · 0 citations
#artificial intelligence Preprint Aug 2026

Beyond Confidence: Test-Time Scaling for Multi-Turn Search Agents via Retrieval Grounding

Retrieval-Grounded Voting (RGV), which scores each rollout by the lexical overlap between its final answer and the documents it retrieved, consistently outperforms confidence-based voting and identifies the underlying failure reason as copy inflation.

Hyunho Kook, Junhyuk So, Tianyu Fu et al. · 0 citations

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