OH

Research staff / Machine learning / Uncertainty

Oliver Hennhöfer

I focus on ML systems that make uncertainty explicit, especially through conformal inference.

Blog

From Scores to Decisions

A short note on turning anomaly scores into calibrated evidence and keeping the decision layer inspectable.

  • conformal inference
  • anomaly detection
  • online FDR

All posts

Research Focus

My work sits at the intersection of inferential statistics and applied machine learning.

  • Uncertainty Quantification. Conformal inference methods for trustworthy decision-making.
  • Anomaly Detection. Unsupervised methods for identifying rare patterns in ill-posed settings.

Projects

nonconform

Python pacakge for Conformal Anomaly Detection & Change-Point Detection.

online-fdr

Python pacakge for false discovery rate control in sequential hypotheses testing.

aberrant

Python package for online anomaly detection in streaming data and related tooling.

Publications

2026

  1. Between Resolution Collapse and Variance Inflation: Weighted Conformal Anomaly Detection in Low-Data Regimes
    O Hennhöfer, C Preisach, arXiv preprint arXiv:2603.23205 (2026).
  2. TalkTag: Fine-Grained Morphosyntactic Error Annotation for Transcribed Speech
    S Venturini, O Hennhöfer, S Kinkel, J Strötgen, Proceedings of the 20th Linguistic Annotation Workshop (LAW XX) (2026).
  3. Conformal Anomaly Detection in Python: Moving Beyond Heuristic Thresholds with 'nonconform'
    O Hennhöfer, M Kirsch, C Preisach, arXiv preprint arXiv:2605.13642 (2026).

2025

  1. Interdisciplinary Harmonies: A Story-Driven Course on AI and Music to Increase Interest in Computer Science
    K Marquardt, Q Shang, O Hennhöfer, L Happe, Proceedings of the 6th European Conference on Software Engineering Education (2025).

2024

  1. Leave-One-Out-, Bootstrap- and Cross-Conformal Anomaly Detectors
    O Hennhöfer, C Preisach, IEEE International Conference on Knowledge Graph (ICKG) 15 (1), 110 - 119 (2024).

2021

  1. Multidimensional Exploratory Spatial Data Analysis
    O Hennhöfer, J Bruns, P Ullrich, A Heiß, G Sharipov, D Paraforos, GI_Forum 2021, 9, 136-151 (2021).

2020

  1. Anomaly Detection in Precision Agriculture with R
    O Hennhöfer, Karlsruhe University of Applied Sciences, 2020.