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Sophie Xhonneux

6 accepted papers

2026

Model Collapse Is Not a Bug but a Feature in Machine Unlearning for LLMs

ICLR 2026poster

Current unlearning methods for LLMs optimize on the private information they seek to remove by incorporating it into their fine-tuning data. We argue this not only risks reinforcing exposure to sensitive data, it also fundamentally contradicts the principle of minimizing its use. As a remedy, we pro…

Cited by 0SourcecodeScholar
2026

Position: LLM-Safety Evaluations Lack Robustness

ICML 2026poster

In this position paper, we argue that current safety alignment research efforts for large language models are hindered by many intertwined sources of noise, such as small datasets, methodological inconsistencies, and unreliable evaluation setups. This can, at times, make it impossible to evaluate an…

Cited by 0SourceScholar
2025

Asynchronous RLHF: Faster and More Efficient Off-Policy RL for Language Models

ICLR 2025poster

The dominant paradigm for RLHF is *online* and *on-policy* RL: synchronously generating from the large language model (LLM) policy, labelling with a reward model, and learning using feedback on the LLM's own outputs. While performant, this paradigm is computationally inefficient. Inspired by classic…

2024

Efficient Adversarial Training in LLMs with Continuous Attacks

NeurIPS 2024spotlight

Large language models (LLMs) are vulnerable to adversarial attacks that can bypass their safety guardrails. In many domains, adversarial training has proven to be one of the most promising methods to reliably improve robustness against such attacks. Yet, in the context of LLMs, current methods for a…

2024

Soft Prompt Threats: Attacking Safety Alignment and Unlearning in Open-Source LLMs through the Embedding Space

NeurIPS 2024poster

Current research in adversarial robustness of LLMs focuses on \textit{discrete} input manipulations in the natural language space, which can be directly transferred to \textit{closed-source} models. However, this approach neglects the steady progression of \textit{open-source} models. As open-source…

2023

A*Net: A Scalable Path-based Reasoning Approach for Knowledge Graphs

NeurIPS 2023poster

Reasoning on large-scale knowledge graphs has been long dominated by embedding methods. While path-based methods possess the inductive capacity that embeddings lack, their scalability is limited by the exponential number of paths. Here we present A\*Net, a scalable path-based method for knowledge gr…