diff --git a/main.pdf b/main.pdf index 94c3aa0..cfce576 100644 Binary files a/main.pdf and b/main.pdf differ diff --git a/main.tex b/main.tex index 4456585..b936a7e 100644 --- a/main.tex +++ b/main.tex @@ -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} diff --git a/ref.bib b/ref.bib index aba4ac3..ef197a8 100644 --- a/ref.bib +++ b/ref.bib @@ -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}, +}