RESEARCH FOCI

My main research is directed towards Learning Classifier Systems (especially XCS and its derivatives), a family of versatile evolutionary rule-based machine learning algorithms. One of the main arguments for their application is that they generate models that are more easily interpreted than the models generated by other learning systems such as artificial neural networks. However, we still don't yet fully understand in a formal way how LCS work, that is, which kinds of problems LCS are able to learn exactly and why they can learn them—which weakens the argument for them by quite a bit. Through my work, I want to develop a more formal understanding of LCS and finally prove several assumptions that were, up to now, only validated experimentally.

Other than that, I'm very interested in

  • reinforcement learning
  • evolutionary machine learning algorithms
  • functional programming, especially using Haskell
  • ways to incoporate a more formal (functional) view into everyday software such as operating systems (NixOS) or window managers (XMonad)
  • free software

Other academic activities

I’ve reviewed journal articles for I was one of the three elected members of the organization committee of the 23rd, 24th, 25th and 26th International Workshop on Evolutionary Rule-based Machine Learning (ERBML) (formerly International Workshop on Learning Classifier Systems, IWLCS) which took place at the Genetic and Evolutionary Computation Conference (GECCO) between 2020 and 2023. Since then, I’m also a program committee member and review papers submitted to the ERBML.

CURRICULUM/VITAE

since 2017 Research Assistant with the chair for Organic Computing
2015–2017 Master course in Computer Science at the University of Augsburg
2011–2015 Bachelor course in Computer Science and Multimedia at the University of Augsburg

COURSES / TEACHING

(applied filters: semester: current | lecturers: David Pätzel | course types: Übung, Seminar)
name semester type
Seminar Organic Computing (Master) summer semester 2023 Seminar
Übung zu Organic Computing II summer semester 2023 Übung
Seminar Organic Computing (Bachelor) summer semester 2023 Seminar

Publications

2023 | 2022 | 2021 | 2020 | 2019 | 2018

2023

Michael Heider, David Pätzel, Helena Stegherr and Jörg Hähner. 2023. A metaheuristic perspective on learning classifier systems. DOI: 10.1007/978-981-19-3888-7_3
BibTeX | RIS | DOI

Michael Heider, Helena Stegherr, Roman Sraj, David Pätzel, Jonathan Wurth and Jörg Hähner. 2023. SupRB in the context of rule-based machine learning methods: a comparative study. DOI: 10.1016/j.asoc.2023.110706
BibTeX | RIS | DOI

Henning Cui, David Pätzel, Andreas Margraf and Jörg Hähner. 2023. Weighted mutation of connections to mitigate search space limitations in Cartesian Genetic Programming. DOI: 10.1145/3594805.3607130
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2022

Lukas Rosenbauer, David Pätzel, Anthony Stein and Jörg Hähner. 2022. A learning classifier system for automated test case prioritization and selection. DOI: 10.1007/s42979-022-01255-1
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Michael Heider, David Pätzel and Alexander R. M. Wagner. 2022. An overview of LCS research from 2021 to 2022. DOI: 10.1145/3520304.3533985
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Michael Heider, Helena Stegherr, David Pätzel, Roman Sraj, Jonathan Wurth, Benedikt Volger and Jörg Hähner. 2022. Approaches for rule discovery in a learning classifier system. DOI: 10.5220/0011542000003332
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David Pätzel and Jörg Hähner. 2022. The Bayesian learning classifier system: implementation, replicability, comparison with XCSF. DOI: 10.1145/3512290.3528736
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2021

Lukas Rosenbauer, David Pätzel, Anthony Stein and Jörg Hähner. 2021. An organic computing system for automated testing. DOI: 10.1007/978-3-030-81682-7_9
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David Pätzel, Michael Heider and Alexander R. M. Wagner. 2021. An overview of LCS research from 2020 to 2021. DOI: 10.1145/3449726.3463173
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Lukas Rosenbauer, David Pätzel, Anthony Stein and Jörg Hähner. 2021. Transfer learning for automated test case prioritization using XCSF. DOI: 10.1007/978-3-030-72699-7_43
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2020

David Pätzel, Anthony Stein and Masaya Nakata. 2020. An overview of LCS research from IWLCS 2019 to 2020. DOI: 10.1145/3377929.3398105
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Michael Heider, David Pätzel and Jörg Hähner. 2020. SupRB: a supervised rule-based learning system for continuous problems.
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Michael Heider, David Pätzel and Jörg Hähner. 2020. Towards a Pittsburgh-style LCS for learning manufacturing machinery parametrizations. DOI: 10.1145/3377929.3389963
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Lukas Rosenbauer, Anthony Stein, Roland Maier, David Pätzel and Jörg Hähner. 2020. XCS as a reinforcement learning approach to automatic test case prioritization. DOI: 10.1145/3377929.3398128
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Lukas Rosenbauer, Anthony Stein, David Pätzel and Jörg Hähner. 2020. XCSF for automatic test case prioritization. DOI: 10.5220/0010105700490058
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Lukas Rosenbauer, Anthony Stein, David Pätzel and Jörg Hähner. 2020. XCSF with experience replay for automatic test case prioritization. DOI: 10.1109/ssci47803.2020.9308379
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2019

David Pätzel, Anthony Stein and Jörg Hähner. 2019. A survey of formal theoretical advances regarding XCS. DOI: 10.1145/3319619.3326848
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2018

David Pätzel and Jörg Hähner. 2018. An algebraic description of XCS. DOI: 10.1145/3205651.3208248
BibTeX | RIS | DOI

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