nearly uniform sparsest cut

This commit is contained in:
Yu Cong 2025-05-28 18:43:03 +08:00
parent 96203daa3d
commit 14c4303f03
3 changed files with 23 additions and 0 deletions

BIN
main.pdf

Binary file not shown.

View File

@ -193,6 +193,15 @@ I think the intuition behind this SDP relaxation is almost the same as \metric{}
The Lasserre relaxation of SDP automatically satisfies 1 and 2. But I believe there may be some very strange kind of metric that embeds into $\ell_1$ well?
Another possible approach for \nonuscut{} would be making the number of demand vertices small and then applying a metric embedding (contraction) to $\ell_1$ with better distortion on those vertices.
\section{Nealy uniform \scut{}}
What is the best approximation ratio for \uscut{} instances where almost all demands are uniform.
More formally, consider a \nonuscut{} instance where only $k$ vertices are associated with demand pairs with $D_i\neq 1$,
we want to show that we can approximate nearly uniform \scut{} in polynomial time to ratio $O(\sqrt{\log n}f(k))$, where $f(k)=O(\log \log n)$ when $k\to n$.
Let those $k$ non uniform vertices be outliers.
\cite{arora_expander_2004} shows that for non-outlier verteices the optimal solution to SDP (a metric) can be embedded into $\ell_1$ with distortion $\sqrt{\log n}$.
\cite{chawla_composition_2023} is a recent result on getting approximate $(k,c)$-outlier embeddings.
\bibliographystyle{alpha}
\bibliography{ref}
\end{document}

14
ref.bib
View File

@ -334,3 +334,17 @@ series = {SODA '95}
year = {2013},
pages = {270--279},
}
@misc{chawla_composition_2023,
title = {Composition of nested embeddings with an application to outlier removal},
url = {http://arxiv.org/abs/2306.11604},
doi = {10.48550/arXiv.2306.11604},
urldate = {2025-05-23},
publisher = {arXiv},
author = {Chawla, Shuchi and Sheridan, Kristin},
month = nov,
year = {2023},
note = {arXiv:2306.11604 [cs]},
keywords = {Computer Science - Data Structures and Algorithms},
annote = {Comment: 28 pages (including 2 appendices), 5 figures},
}