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N. Stein

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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
Preprint Aug 2026

Evolving Executable Pipeline Programs for AutoML with Language Models

This work presents LACE, an AutoML framework that instead searches over complete executable pipeline programs: an evolutionary loop maintains a population of scikit-learn-compatible Python classes, and a large language model acts as the variation operator.

Sofoklis Kitharidis, C. Veenman, J. V. van Rijn et al. · 0 citations
Preprint Jul 2026

LLM-Driven Evolutionary Generation of Multi-Objective Bayesian Optimization Algorithms

LLM-driven evolutionary search can discover algorithm designs that achieve Pareto-efficient trade-offs difficult to reach through manual design, with SMAC hyperparameter optimization integrated into the evolutionary loop.

G. Laskaris, R. Brasher, Niki van Stein et al. · 0 citations

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