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Author

E. Hüllermeier

3 papers indexed here

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#machine learning Preprint Oct 2026

Bayesian Optimization of CVaR with Unknown Hyperparameters

We study Bayesian optimization of the Conditional Value-at-Risk (CVaR) of an expensive black-box function that depends on a decision and an environmental variable. Existing no-regret algorithms assume that the correct Gaussian process (GP) kernel and its hyperparameters are known. In practice, however, they must be est...

Valentin Margraf, Jonas Hanselle, Viktor Bengs et al. · 0 citations
#machine learning Preprint Oct 2026

Credal Machine Learning for Risk-Averse Decision Making

In many machine learning applications, it is necessary to guard against worst-case scenarios and predictions that could result in substantial losses. In principle, this can be achieved by training risk-averse predictive models that minimize loss functions such as conditional value-at-risk (CVaR), rather than relying on...

Tim Löhr, Paul Hofman, Maximilian Muschalik et al. · 0 citations
#natural language process... Preprint May 2025

From ASR to ASP: Evaluating Prompt Attack Vulnerabilities Against Open-Source LLMs

This paper comprehensively studies effective prompt injection attacks against 14 widely used open-source and three closed-source LLMs on five attack benchmarks and proposes a straightforward and effective hypnotism attack, showing that this attack causes aligned language models to generate objectionable behaviors.

Jia-Wen Wang, Pritha Gupta, E. Hüllermeier et al. · 9 citations

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