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T. Bäck

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#artificial intelligence Preprint Sep 2026

Exposing Blind Spots in Deep Imbalanced Regression Evaluation

The results show that standard virtual-sensing models exhibit substantial tail degradation hidden by global MAE, that existing DIR methods can improve balanced performance but transfer unevenly to multimodal time-series data, and that tail-region instability remains a largely hidden failure mode under current DIR evalu...

Noah C. Puetz, Jens U. Brandt, M. Hilbert et al. · 0 citations
Book Open access Feb 2026

Structural Bias in Multi-objective Optimization

This work introduces a suite of synthetic multi-objective test problems with analytically controlled Pareto fronts and deliberately uninformative objective values, designed to decouple algorithmic behaviour from problem structure, allowing bias induced purely by algorithmic operators and design choices to be observed.

Jakub Kůdela, Niki van Stein, T. Bäck et al. · 0 citations

Beyond Scalar Fitness: Behavioural Feedback for LLM-Driven Metaheuristic Evolution

It is found that neutral framing of behavioural features, reporting the feature value without prescriptive advice, consistently outperforms the prescriptive variants, and that prescriptive feedback steers the median feature value in the advised direction in only 37% of cases despite empirically grounded advice.

Max Harell, N. Stein, Thomas Bäck · 0 citations
Book Open access Jul 2026

EvoHIIT: Preference-Based Selection in LLM-Assisted Evolutionary Design of Natural Language Solutions

EvoHIIT, an LLM-assisted evolutionary framework for the design of High-Intensity Interval Training (HIIT) programs, is introduced, and preference-based selection mechanisms are studied to provide empirical insight into human-aligned evolution of natural language solutions.

Johana Chen, Niki van Stein, Robert Cabri et al. · 0 citations

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