Paper Accepted at NeurIPS 2026

Thu, 01 Oct 2026 00:00:00 +0000

Our paper “Dynamic Regret in Online Convex Optimization with Indicator Switching Costs,” with George Iosifidis, has been accepted at NeurIPS 2026.

The paper studies online decisions that incur a fixed cost whenever they change, capturing startup overheads such as server activation, model deployment, and cache updates. Existing guarantees for such costs only compete against a fixed benchmark. We propose a meta-learning algorithm whose dynamic regret is minimax-optimal, up to logarithmic factors, for tracking piecewise-constant comparators, without prior knowledge of how often the comparator changes.

Preprint: 📄

Successfully Defended My Ph.D. Dissertation

Mon, 24 Nov 2025 00:00:00 +0000

On 24 November 2025, I successfully defended my Ph.D. dissertation, “Optimistic Learning with Applications to Caching Networks,” at Delft University of Technology.

The work was carried out in the , under the supervision of Prof. dr. K. G. Langendoen (promotor) and Dr. G. Iosifidis (copromotor).

The thesis at a glance

The thesis asks how sequential decision-making algorithms can leverage untrusted predictions while still maintaining worst-case guarantees. Its central application is caching in content delivery networks, where the proposed algorithms are validated experimentally on multiple established datasets and benchmarks. Each chapter addresses this question under a progressively richer benchmark: static regret for coded caching, α-static regret for whole-file caching, dynamic regret for tracking a moving target, and policy regret for systems with memory.

Technical progression of the chapters. Each chapter adopts a distinct regret metric suited to its actions set and choice of comparator(s).

Materials

Dissertation (PDF): 📄
Defense recording: 🎥

Doctoral Committee

Rector Magnificus, Chairman
Prof. dr. K. G. Langendoen, Delft University of Technology — promotor
Dr. G. Iosifidis, Delft University of Technology — copromotor

Independent Members

Prof. dr. G. Dán, KTH Royal Institute of Technology, Sweden
Prof. dr. P. Grosso, University of Amsterdam
Prof. dr. M. T. J. Spaan, Delft University of Technology
Prof. dr. T. Spyropoulos, Technical University of Crete, Greece
Dr. T. A. L. van Erven, University of Amsterdam

I am deeply grateful to my promotors, the members of the committee, my colleagues, and my family for their support throughout this journey.

News & Updates |

Paper Accepted at NeurIPS 2026

Successfully Defended My Ph.D. Dissertation

Materials

Doctoral Committee

Independent Members