# Online Algorithms for Spectral Hypergraph Sparsification

Tasuku Soma, Kam Chuen (Alex) Tung, Yuichi Yoshida

October, 2023

### Abstract

We provide the first online algorithm for spectral hypergraph sparsification. In the online setting, hyperedges with positive weights are arriving in a stream, and upon the arrivial of each hyperedge, we must irrevocably decide whether or not to include it in the sparsifier. Our algorithm produces an $(\epsilon, \delta)$-spectral sparsifier with multiplicative error $\epsilon$ and additive error $\delta$ that has $O(\epsilon^{-2} n (\log n)^2 \log(1 + \epsilon W/\delta n))$ hyperedges with high probability, where $\epsilon, \delta \in (0,1)$, $n$ is the number of nodes, and $W$ is the sum of edge weights. The space complexity of our algorithm is $O(n^2)$, while previous algorithms require the space complexity of $\Omega(m)$, where $m$ is the number of hyperedges.This provides an exponential improvement in the space complexity since $m$ can be exponential in $n$.

Publication

Accepted in the 25th Conference on Integer Programming and Combinatorial Optimization

###### PhD Candidate in Computer Science