I am a final-year undergraduate student in Computer Science and Artificial Intelligence at Poznan University of Technology, Poland. My research interests focus on machine learning, explainable AI to enhance the transparency, safety, and trustworthiness of AI systems, with a an emphasis on counterfactual explanations. Recently I've been also working on decentralized federated learning.
I work as a research assistant in the Machine Learning Laboratory at Poznan University of Technology, under the supervision of Prof. Jerzy Stefanowski and Dr. Mateusz Lango, where I develop robust counterfactual explanations to improve the interpretability of black-box models in dynamic environments. My ongoing project involves designing a statistical approach to generate explanations that remain effective despite model changes, aiming to increase their actionability for end-users.
Last summer I worked in the AutonLab (Robotics Institute, Carnegie Mellon University). My research was focused on adaptive strategies for persistent agent failure/loss in decentralized federated learning paradigm, under the supervision of Dr. Artur Dubrawski. A year ago, I also spent my summer there. However, back then my work was in formal verification of Bayesian Networks, focusing on ensuring that critical design specifications are met in AI systems.
I have also been a member of an R&D team at the Poznan Supercomputing and Networking Center (Polish Academy of Sciences) since 2021. At PSNC, I contributed to various EU-funded projects, including analyzing black-box model behavior and implementing anomaly detection solutions in industrial automotive settings and HPC clusters.
News Feed
- Paper accepted at SIGKDD'25 main track- Nov 17, 2024
- Three posters at ML in PL in Warsaw, Poland- Nov 10, 2024
- Oral presentation at XRAI workshop on ECML PKDD 2024 in Vilnus, Lithuania- Sep 13, 2024
- Poster at GhostDay AMLC in Poznan, Poland- May 4, 2024
- Poster at 4-th Polish Conference on Artificial Intelligence in Lodz, Poland- Apr 24, 2023
Publications
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- Ignacy Stępka, Mateusz Lango, Jerzy Stefanowski -"Counterfactual Explanations with Probabilistic Guarantees on their Robustness to Model Change"- 31st SIGKDD Conference on Knowledge Discovery and Data Mining - Research Track (KDD 2025) - Aug 10, 2024
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- Ignacy Stępka, Nicholas Gisolfi, Artur Dubrawski -"A SAT-based approach to rigorous verification of Bayesian networks"- Workshop on Explainable and Robust AI for Industry 4.0 & 5.0 (X-RAI) @ Joint European Conference on Machine Learning and Knowledge Discovery in Databases (ECML PKDD 2024) - Jul 15, 2024
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- Ignacy Stępka, Mateusz Lango, Jerzy Stefanowski -"A Multi-criteria approach for selecting an explanation from the set of counterfactuals produced by an ensemble of explainers"- International Journal of Applied Mathematics and Computer Science (AMCS) - Mar 20, 2024
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- Ignacy Stępka, Mateusz Lango, Jerzy Stefanowski -"On usefulness of dominance relation for selecting counterfactuals from the ensemble of explainers"- 4th Polish Conference on Artificial Intelligence, PP-RAI 2023 - Sep 18, 2023