Teodora Popordanoska

I am a Postdoctoral Researcher at KU Leuven in Belgium. My research focuses on understanding and improving multimodal foundation models by analyzing how they integrate information across modalities and identifying modality biases, modality integration failures, and limitations in state-of-the-art vision-language and audio-visual systems.

Previously, I obtained my PhD at KU Leuven, where I worked on uncertainty calibration of deep neural networks in the ESAT-PSI lab, supervised by Prof. Matthew B. Blaschko.

Teodora Popordanoska

News

2025

Dec 2025
Nov 2025

Preprint for CLASH: A Benchmark for Cross-Modal Contradiction Detection is available on arXiv.

Oct 2025

Gave a guest lecture on uncertainty calibration in AI at Aalto University, Finland.

Sep 2025

Our paper DAVE on audio-visual evaluation is accepted at NeurIPS 2025 🎉.

Feb 2025

Started a new position as Postdoctoral Researcher at KU Leuven.

Jan 2025

Successfully defended my PhD (thesis available here) 🎓.

Selected Publications

My research focuses on understanding and improving multimodal foundation models, with a particular interest in designing diagnostic benchmarks and analyzing modality integration failures. Previously, my work centered on uncertainty calibration, where I developed theoretically grounded methods for estimating calibration errors and ensuring model reliability under distribution shifts. For a complete list, please visit my Google Scholar.

DAVE Benchmark
NeurIPS 2025

DAVE: Diagnostic benchmark for Audio Visual Evaluation

G. Radevski*, T. Popordanoska*, M. B. Blaschko, T. Tuytelaars

A diagnostic benchmark for systematically evaluating audio-visual models, preventing visual bias by decoupling evaluation into atomic subcategories. It ensures both modalities are necessary for correct answers.

LaSCal Method
NeurIPS 2024

LaSCal: Label-shift calibration without target labels

T. Popordanoska*, G. Radevski*, T. Tuytelaars, M. B. Blaschko

We introduce a label-free, consistent Calibration Error estimator and a post-hoc calibration strategy specifically for label shift, enabling unsupervised calibration on target domains.

AISTATS 2024 Figure
AISTATS 2024

Consistent and Asymptotically Unbiased Estimation of Proper Calibration Errors

T. Popordanoska*, S. Gruber*, A. Tiulpin, F. Buettner, M. Blaschko

We propose a method that allows consistent, and asymptotically unbiased estimation of all proper calibration errors and refinement terms, introducing Kullback-Leibler calibration error.

WACV 2023 Figure
WACV 2023

Beyond classification: Definition and estimation of calibration in object detection

T. Popordanoska, A. Tiulpin, M. B. Blaschko

We adapt the definition of classification calibration error to object detection and propose a consistent and differentiable estimator utilizing kernel density estimation.

NeurIPS 2022 Figure
NeurIPS 2022

A Consistent and Differentiable Lp Canonical Calibration Error Estimator

T. Popordanoska*, R. Sayer*, M. B. Blaschko

We propose a low-bias, trainable calibration error estimator based on Dirichlet kernel density estimates, which asymptotically converges to the true Lp calibration error.

Experience

Postdoctoral Researcher

KU Leuven, Belgium Feb 2025 - Present

I develop diagnostic benchmarks and evaluation methodologies for multimodal learning and design techniques to improve model robustness, calibration, and real-world reliability.

Software Engineer

Netcetera, North Macedonia May 2017 - Sep 2018

Developed and maintained full-stack web applications. Started with an internship Dec 2016 - Feb 2017.

Technologies: Java (Spring, GWT), JavaScript (React), SQL (PostgreSQL, MySQL), Git, Jenkins.

Education

PhD, Machine Learning & Computer Vision

KU Leuven, Belgium Aug 2020 - Jan 2025

Thesis: Advancing Calibration in Deep Learning: Theory, Methods, and Applications

MSc, Artificial Intelligence | Engineering & Computer Science

KU Leuven, Belgium Sep 2018 - Feb 2020

Thesis: Human-initiated Interactive Learning with Clustering-based Global explanations

BSc, Computer System Engineering, Automation and Robotics

Ss. Cyril and Methodius University, N. Macedonia Sep 2013 - Feb 2018

Thesis:Comparison of Machine Learning Models for a Job Recommendation System