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Li-Jia Yu

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#machine learning Preprint Sep 2026

On the Capability and Limitation of Hard Prompt

These findings not only offer the first theoretical insights into hard prompts but also provide provably reliable practical guidance for real-world LLM usage.

Li-Jia Yu, Shuai-Tong Liu, Gao-Jie Jin et al. · 0 citations
Preprint Sep 2026

On the Turing Completeness of Transformers and Agents

It is shown that a single fixed finite precision transformer cannot memorize certain Turing machines with inputs of arbitrary length, such as the arithmetic; and a single fixed infinite precision transformer trained with a random algorithm is not Turing complete with probability one under reasonable conditions.

Y. Qiao, Li-Jia Yu, Rui-Chen Qiu et al. · 0 citations
Preprint Aug 2026

Once Poisoned, Arbitrarily Controlled: A Programmable Backdoor in VLMs

This work shows that a single poisoning phase can implant a programmable backdoor into a VLM, allowing an attacker to choose previously unseen target-caption semantics at inference time and synthesize corresponding stealthy triggers on demand.

Tao Lin, Gao-Jie Jin, Zongxi Liu et al. · 0 citations

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