← Search

Nikolaos Karalias

5 accepted papers

2025

Geometric Algorithms for Neural Combinatorial Optimization with Constraints

NeurIPS 2025poster

Self-Supervised Learning (SSL) for Combinatorial Optimization (CO) is an emerging paradigm for solving combinatorial problems using neural networks. In this paper, we address a central challenge of SSL for CO: solving problems with discrete constraints. We design an end-to-end differentiable framewo…

Cited by 0SourceScholar
2024

Are Graph Neural Networks Optimal Approximation Algorithms?

NeurIPS 2024spotlight

In this work we design graph neural network architectures that capture optimal approximation algorithms for a large class of combinatorial optimization problems, using powerful algorithmic tools from semidefinite programming (SDP). Concretely, we prove that polynomial-sized message-passing algorithm…

2022

Neural Set Function Extensions: Learning with Discrete Functions in High Dimensions

NeurIPS 2022accept

Integrating functions on discrete domains into neural networks is key to developing their capability to reason about discrete objects. But, discrete domains are (1) not naturally amenable to gradient-based optimization, and (2) incompatible with deep learning architectures that rely on representatio…

2021

Partition and Code: learning how to compress graphs

NeurIPS 2021poster

Can we use machine learning to compress graph data? The absence of ordering in graphs poses a significant challenge to conventional compression algorithms, limiting their attainable gains as well as their ability to discover relevant patterns. On the other hand, most graph compression approaches rel…

2020

Erdos Goes Neural: an Unsupervised Learning Framework for Combinatorial Optimization on Graphs

NeurIPS 2020oral

Combinatorial optimization (CO) problems are notoriously challenging for neural networks, especially in the absence of labeled instances. This work proposes an unsupervised learning framework for CO problems on graphs that can provide integral solutions of certified quality. Inspired by Erdos' prob…