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L. Chen

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#machine learning Preprint Sep 2026

MISHAP-Bench: A Hallucination Benchmark for Large Audio-Language Models

This work introduces MISHAP-Bench, a comprehensive benchmark with 12,000 challenging open-ended question-audio pairs and a rigorous evaluation pipeline covering two hallucination categories, and proposes a groundedness judge that uses reference rubrics and judge prompts guided by human annotations.

Wen-Soi Zhi, Giulio Segalini, Jian-Jia Chen et al. · 0 citations
#artificial intelligence Preprint Sep 2026

Safety Reconstructed: Generative Modeling via Masked Diffusion Builds Strong Safety Guardrails

Guard models are the last line of defense between a language model and a harmful output, yet their training objective is surprisingly narrow. Existing guards learn to predict a single verdict token from a conversational context, concentrating supervision on a single target. The consequences are structural: models latch...

Gert Lek, Abele Malan, Chao-Yi Zhu et al. · 0 citations
Preprint Aug 2026

Diffusion LLMs as Targets and Adversaries: Mechanistic Safety Exploits

SN-Guided Diffusion is introduced, a fully offline black-box jailbreak framework that steers the diffusion process away from safety-triggering regions using a weighted safety neuron loss, which achieves near-perfect prompt separability.

Elena Dumitrescu, Gert Lek, L. Chen et al. · 0 citations
Jul 2026

Adaptive Differential Privacy Noise Injection for Decentralized Federated Learning of Visual Recognition Tasks

The two key modules of DecentDP are a parameter selector that designates a subset of parameters for local-only updates, allowing them to be updated without DP noise, and a noise injector that adaptively adds less DP noise to exchangeable parameters that are more sensitive to DP noise.

Junyan Ouyang, Siqi Du, Rui Han et al. · 0 citations
#diffusion models Open access Oct 2026

Measuring Legislature-Aligned Privacy Risks in Synthetic Graphs

SyntheGrAnon is introduced, a framework for evaluating synthetic graph anonymity that primarily targets the singling out, linkability, and inference risks outlined in the EU GDPR at the node and community levels, while also including edge-level attacks as an extension of the node-level setting.

Abele Malan, Ahmad Al Kurdi, Stefanie Roos et al. · 0 citations

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