Nils Philipp Walter

I am a first year Ph.D. at the CISPA Helmholtz Center for Information Security, supervised by Jilles Vreeken. I am broadly interested in robust and explainable machine learning for large-scale real-world applications. In my Ph.D, I intend to develop new approaches that are at the same time descriptive and predictive. That is the models not only offer predictive capabilities but also facilitate practitioners to gain deeper insights into the problems they are addressing.

Before joining CISPA, I was a research assistant in the goup of Bernt Schiele at the Max-Planck-Institut for Informatics, supervised by David Stutz . My research focused on adversarial and out-of-distribution robustness of Quantized Neural Networks. I also worked on the influence of Batch Normalization on the vulnerability and generalization capabilities of neural networks.

news

Feb '24	Preprint of our paper Learning Exceptional Subgroups by End-to-End Maximizing KL-divergence available on arXiv.
Feb '24	Attending AAAI 2024 in Vancouver, Canada.
Dec '23	Attended Kickoff-Retreat of the RTG for Neuroexplicit Models at Schloss Dagstuhl.
Dec '23	Our paper Finding Interpretable Class-Specific Patterns through Efficient Neural Search got accepted to AAAI 24!
Nov '23	Glad to be accepted to the Machine Learning Summer School 2024 in Okinawa!
Jun '23	Started my Ph.D. at CISPA Helmholtz Center for Information Security.

publications

2024

arXiv

Learning Exceptional Subgroups by End-to-End Maximizing KL-divergence

Sascha Xu, Nils Philipp Walter, Janis Kalofolias, and Jilles Vreeken

arXiv preprint arXiv:22402.12930, 2024

Bib HTML PDF

@article{xu2024learning,
  title = {Learning Exceptional Subgroups by End-to-End Maximizing KL-divergence},
  author = {Xu, Sascha and Walter, Nils Philipp and Kalofolias, Janis and Vreeken, Jilles},
  journal = {arXiv preprint arXiv:22402.12930},
  year = {2024},
  organization = {arXiv},
}

AAAI

Finding Interpretable Class-Specific Patterns through Efficient Neural Search

Nils Philipp Walter, Jonas Fischer, and Jilles Vreeken

In Proceedings of the 38th Annual AAAI Conference on Artificial Intelligence, 2024

Bib HTML PDF

@inproceedings{walter2024finding,
  title = {Finding Interpretable Class-Specific Patterns through Efficient Neural Search},
  author = {Walter, Nils Philipp and Fischer, Jonas and Vreeken, Jilles},
  booktitle = {Proceedings of the 38th Annual AAAI Conference on Artificial Intelligence},
  year = {2024},
  organization = {AAAI},
}

2022

CVPR

On Fragile Features and Batch Normalization in Adversarial Training

Nils Philipp Walter, David Stutz, and Bernt Schiele

arXiv preprint arXiv:2204.12393, 2022

Bib HTML PDF

@article{walter2022fragile,
  title = {On Fragile Features and Batch Normalization in Adversarial Training},
  author = {Walter, Nils Philipp and Stutz, David and Schiele, Bernt},
  journal = {arXiv preprint arXiv:2204.12393},
  year = {2022},
}