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Zhaohan Zhang

7 accepted papers

2026

MGT-Prism: Enhancing Domain Generalization for Machine-Generated Text Detection via Spectral Alignment

AAAI 2026technical

Large Language Models have shown growing ability to generate fluent and coherent texts that are highly similar to the writing style of humans. Current detectors for Machine-Generated Text (MGT) perform well when they are trained and tested in the same domain but generalize poorly to unseen domains,

Cited by 0SourcePDFScholar
2025

Get Confused Cautiously: Textual Sequence Memorization Erasure with Selective Entropy Maximization

COLING 2025main

Large Language Models (LLMs) have been found to memorize and recite some of the textual sequences from their training set verbatim, raising broad concerns about privacy and copyright issues. This Textual Sequence Memorization (TSM) phenomenon leads to a high demand to regulate LLM output to prevent…

2025

HACo-Det: A Study Towards Fine-Grained Machine-Generated Text Detection under Human-AI Coauthoring

ACL 2025long

The misuse of large language models (LLMs) poses potential risks, motivating the development of machine-generated text (MGT) detection. Existing literature primarily concentrates on binary, document-level detection, thereby neglecting texts that are composed jointly by human and LLM contributions. H…

Cited by 0SourcePDFScholar
2025

Iron Sharpens Iron: Defending Against Attacks in Machine-Generated Text Detection with Adversarial Training

ACL 2025long

Machine-generated Text (MGT) detection is crucial for regulating and attributing online texts. While the existing MGT detectors achieve strong performance, they remain vulnerable to simple perturbations and adversarial attacks. To build an effective defense against malicious perturbations, we view M…

2024

Concentrate Attention: Towards Domain-Generalizable Prompt Optimization for Language Models

NeurIPS 2024poster

Recent advances in prompt optimization have notably enhanced the performance of pre-trained language models (PLMs) on downstream tasks. However, the potential of optimized prompts on domain generalization has been under-explored. To explore the nature of prompt generalization on unknown domains, we…

2024

Does DetectGPT Fully Utilize Perturbation? Bridging Selective Perturbation to Fine-tuned Contrastive Learning Detector would be Better

ACL 2024long

The burgeoning generative capabilities of large language models (LLMs) have raised growing concerns about abuse, demanding automatic machine-generated text detectors. DetectGPT, a zero-shot metric-based detector, first introduces perturbation and shows great performance improvement. However, in Dete…

2024

StablePT : Towards Stable Prompting for Few-shot Learning via Input Separation

EMNLP 2024finding

Large language models have shown their ability to become effective few-shot learners with prompting, revoluting the paradigm of learning with data scarcity. However, this approach largely depends on the quality of prompt initialization and always exhibits large variability among different runs. Such…