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Yiwei Cai

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#artificial intelligence Preprint Sep 2026

TimeEvo: Failure-Driven Self-Evolution of a Time Series Agent

Time series agents answer analytical questions by calling external tools, and which tools they carry is decided by people before the agent runs. However, we identify two failures in this setup. Human-Agent Tool Misalignment: a library of 21 expert-curated tools helps on some tasks and hurts on others, dropping anomaly...

Jie Yang, Yan Zheng, Jia-Rui Sun et al. · 0 citations
#machine learning Preprint Aug 2026

Token Signatures of Code: Comparing Coding Behaviors Across Large Language Models

The evaluation of large language models (LLMs) on coding tasks has primarily focused on performance metrics such as pass@k. As LLMs continue to advance, many models now meet baseline performance requirements, reducing the discriminative power of performance-based evaluation alone. Yet a key question remains largely une...

Jun-Peng Wang, Yuzhong Chen, Menghai Pan et al. · 0 citations

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