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Hello, I am Simon 👋
I am currently working as a senior AI/ML engineer at Logitech. Previously, I was working in the research team at the Swiss Data Science Center, conducting my doctoral studies in computational statistics at ETH Zurich, and studying at TU Munich.
If you want to chat, you can reach me here:

Code

You can find my software on GitHub . Some recent projects are:
  • blaxbird : A PyTorch Lightning-like framework for training neural networks with Flax/NNX
  • sbijax : A library for neural simulation-based inference workflows in Python
  • ebm : Training energy-based models with noise-contrastive estimation in Python/Flax
  • ramsey : Probabilistic deep learning for Python

Research interests

Generative modelling, (causal) representation learning, semi-supervised learning, time series models, signal processing, numerical computing.

Recent work

  • High resolution seismic waveform generation using denoising diffusion (arXiv:2410.19343): A bespoke diffusion model trained from scratch on real earthquakes, i.e., audio signals, to synthesize realistic, high-frequency seismic waveforms.
    Keywords: denoising diffusion, score matching, signal processing
  • Causal posterior estimation (arXiv:2505.21468): A new method for simulation-based inference that exploits the conditional independence structure of the posterior programs and encodes it into a new NN architecture.
    Keywords: simulation-based inference, flow matching, causality
  • Simulated-Annealing ABC with multiple summary statistics (arXiv:2505.23261): We propose a novel ABC method that works well on high-dimensional parameter and data spaces using Simulated Annealing.
    Keywords: ABC, MCMC
  • Simulation-based Inference with the Python Package sbijax (arXiv:2409.19435): A Python package implementing simulation-based inference and ABC methods in JAX.
    Keywords: simulation-based inference, ABC, Python, JAX
  • More to come soon...

Currently reading

  • Erich Fromm, Fear of Freedom
  • Erich Fromm, The Sane Society
  • Hartmut Rosa, Resonance
  • Francois Le Gall, Brownian Motion, Martingales, and Stochastic Calculus

© 2017-2026 Simon Dirmeier