Dr. Pascal Welke

I am interested in Data Mining, Applied Graph Theory, Machine Learning, and Human-computer Interaction. I wrote my PhD thesis on 'Probabilistic Frequent Subtree Mining'.

I also teach several courses that are offered by our group in the Bachelors program and Masters program in Computer Science and I supervise BA and MA theses.

Contact

University of Bonn:

Phone: +49 228 73 4514

Room 1.027
Friedrich-Hirzebruch-Allee 8
53115 Bonn

Please send snail mail to
Friedrich-Hirzebruch-Allee 5
53115 Bonn

email: 

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Other:

I have an account on ResearchGate.  My publications are indexed by dblp and google scholar.
You can give me anonymous feedback (for example on my teaching performance).

Publications

1. Janis Kalofolias, Pascal Welke, Jilles Vreeken:
   SUSAN: The Structural Similarity Random Walk Kernel.
   SIAM International Conference on Data Mining, SDM (accepted), 2021.
   

   [preprint] [slides] [video] [conference]

2. Pascal Welke, Fouad Alkhoury, Christian Bauckhage, Stefan Wrobel:
   Decision Snippet Features.
   International Conference on Pattern Recognition, ICPR, 2021.
   

   [preprint] [video] [slides] [doi] [conference]

3. Till Hendrik Schulz, Tamas Horvath, Pascal Welke, Stefan Wrobel:
   A Generalized Weisfeiler-Lehman Graph Kernel.
   CoRR abs/2101.08104, 2021.
   

   [preprint] [slides] [arXiv]

4. Dario Antweiler, Pascal Welke:
   Temporal Graph Analysis for Outbreak Pattern Detection in COVID-19 Contact Tracing Networks.
   Machine Learning in Public Health Workshop, MLPH@NeurIPS, 2020.
   

   [preprint] [slides] [workshop]

5. Pascal Welke:
   Efficient Frequent Subgraph Mining in Transactional Databases.
   IEEE International Conference on Data Science and Advanced Analytics, DSAA, 2020.
   

   [preprint] [video] [slides] [doi] [conference]

6. Pascal Welke, Florian Seiffarth, Michael Kamp, Stefan Wrobel:
   HOPS: Probabilistic Subtree Mining for Small and Large Graphs.
   ACM SIGKDD International Conference on Knowledge Discovery & Data Mining, KDD, 2020.
   

   [preprint] [short video] [slides] [video] [doi] [dblp] [conference]

7. Alexander Mehler, Wahed Hemati, Pascal Welke, Maxim Konca, Tolga Uslu:
   Multiple Texts as a Limiting Factor in Online Learning: Quantifying (Dis-)similarities of Knowledge Networks across Languages.
   Frontiers in Education | Digital Education, 2020.
   

   [preprint] [doi] [dblp] [arXiv] [journal]

8. Till Schulz, Pascal Welke:
   On the Necessity of Graph Kernel Baselines.
   Graph Embedding and Mining Workshop, GEM@ECMLPKDD, 2019.
   

   [paper] [poster] [workshop]

9. Pascal Welke:
   Frequent Subtree Mining Beyond Forests.
   Dissertations in Artificial Intelligence Vol. 348, IOS Press, 2019.
   

   [book] [pdf] [slides] [urn] [official publication venue]

10. Pascal Welke, Tamas Horvath, Stefan Wrobel:
    Probabilistic and Exact Frequent Subtree Mining in Graphs Beyond Forests.
    Machine Learning, Volume 108, Issue 7, 2019
    

    [preprint] [doi] [read-only free official version] [journal]

11. Pascal Welke, Tamas Horvath, Stefan Wrobel:
    Probabilistic Frequent Subtrees for Efficient Graph Classification and Retrieval.
    Machine Learning, Volume 107, Issue 11, Springer, 2018.
    

    [preprint] [dblp] [doi] [read-only free official version] [journal]

12. Till Hendrik Schulz, Tamas Horvath, Pascal Welke, Stefan Wrobel:
    Mining Tree Patterns with Partially Injective Homomorphisms.
    European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases, ECML/PKDD, Springer LNCS 11052, 2018.
    

    [preprint] [slides] [dblp] [doi] [conference]

13. Pascal Welke:
    Simple Necessary Conditions for the Existence of a Hamiltonian Path with Applications to Cactus Graphs.
    CoRR abs/1709.01367, 2017.
    

    [preprint] [slides] [arXiv] [workshop]

14. Pascal Welke, Alexander Markowetz, Torsten Suel, Maria Christoforaki:
    3-Hop Distance Estimation in Social Graphs.
    IEEE International Conference on Big Data, BigData, IEEE, 2016.
    

    [preprint] [slides] [dblp] [doi] [conference]

15. Pascal Welke, Tamas Horvath, Stefan Wrobel:
    Min-Hashing for Probabilistic Frequent Subtree Feature Spaces.
    Proceedings of Discovery Science - 18th International Conference, DS, Springer LNAI 9956, 2016.
    

    [preprint] [slides] [poster] [dblp] [doi] [conference]

16. Katrin Ullrich, Jennifer Mack, Pascal Welke:
    Ligand Affinity Prediction with Multi-Pattern Kernels.
    Proceedings of Discovery Science - 18th International Conference, DS, Springer LNAI 9956, 2016.
    

    [preprint] [slides] [dblp] [doi] [conference]
    

17. Pascal Welke, Ionut Andone, Konrad Blaskiewicz, Alexander Markowetz:
    Differentiating Smartphone Users by App Usage.
    Proceedings of the ACM International Joint Conference on Pervasive and Ubiquitous Computing, UbiComp, ACM, 2016.
    

    [preprint] [slides] [dblp] [doi] [conference]

18. Pascal Welke, Tamas Horvath, Stefan Wrobel:
    Probabilistic Frequent Subtree Kernels.
    Proceedings of the Fourth Workshop on New Frontiers in Mining Complex Patterns, nfMCP@ECMLPKDD, Selected Extended Papers, Springer LNCS 9607, 2015.

    [preprint] [slides] [dblp] [doi] [workshop]
    

19. Pascal Welke, Tamas Horvath, Stefan Wrobel:
    On the Complexity of Frequent Subtree Mining in Very Simple Structures.
    Proceedings of the Inductive Logic Programming Conference, ILP, Springer LNCS 9046, 2014.
    

    [preprint] [slides] [dblp] [doi] [conference]

20. Anne-Kathrin Mahlein, Till Rumpf, Pascal Welke, Heinz-Wilhelm Dehne, Lutz Plümer, Ulrike Steiner, Erich-Christian Oerke:
    Development of spectral indices for detecting and identifying plant diseases.
    Remote Sensing of Environment Volume 128, Elsevier, 2013.
    

    [doi] [journal]

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