Niklas Kemper

Research

Publications

Work on discrete generation, graph neural networks, expressivity, and generalization.

  1. Trajectory Matching: Discrete Flow Matching with Structured Actions

    Niklas Kemper, Marten Lienen, David Lüdke, Stephan Günnemann

    Preprint

    Paper Blog post

  2. What Expressivity Theory Misses: Message Passing Complexity for GNNs

    Niklas Kemper, Tom Wollschläger, Stephan Günnemann

    NeurIPS 2025Spotlight

    Paper Project page

  3. Expressivity and Generalization: Fragment-Biases for Molecular GNNs

    Tom Wollschläger*, Niklas Kemper*, Leon Hetzel, Johanna Sommer, Stephan Günnemann

    ICML 2024Oral presentation

    * Equal contribution

    Paper Project page