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cs.DS updates on arXiv.org

PAC Learning with Bandit Feedback: Sharp Sample Complexity in the Realizable Setting Algorithms with Polynomially-Improved Approximation Factors for the $2 \rightarrow q$ Norm, and Applications A computational phase transition for learning-to-sample from Ising models Covering vertices by sequential stars Fermi-Dirac machines as quantizations of neurons A Comprehensive Evaluation of Vertex Elimination Algorithms for Algorithmic Differentiation A Tight Bound on Localization of Electrical Flows Optimal Dimension-Free Sampling for Regularized Classification Reducing the Randomness in Partition Oracles for Bounded Degree Minor-Free Graphs Beyond the Half-Approximation: Fair and Efficient Online Class Matching Efficient Uniform Sampling of Surjections via their Profiles Tractable Maximization of Budgeted Phylogenetic Diversity on Networks Utilizing Node Scanwidth Fairness in Aggregation: Optimal Top-$k$ and Improved Full Ranking Learning-Augmented Online Scheduling with Parsimonious Preemption Entropy Equivalence Testing Lumberjack: Better Differentially Private Random Forests through Heavy Hitter Detection in Trees The Secretary Problem with a Stochastic Precursor Polynomial-Time Robust Multiclass Linear Classification under Gaussian Marginals Efficient Banzhaf-Based Data Valuation for $k$-Nearest Neighbors Classification Block-Sphere Vector Quantization An Approximation Algorithm for Graph Label Selection Iterative Chow Filtering for Learning with Distribution Shift Complexity of Non-Log-Concave Sampling in Fisher Information Stochastic Matching via Local Sparsification Finite Sample Bounds for Learning with Score Matching What is Learnable in Valiant's Theory of the Learnable? Provable Quantization with Randomized Hadamard Transform Min-Max Optimization Requires Exponentially Many Queries Fast and Compact Graph Cuts for the Boykov-Kolmogorov Algorithm A proximal gradient algorithm for composite log-concave sampling
A Distributed Palette Sparsification Theorem
Maxime Flin, Mohsen Ghaffari, Magnús M. Halldórsson, Fabian Kuhn · 2023-01-16 · via cs.DS updates on arXiv.org

The celebrated palette sparsification result of [Assadi, Chen, and Khanna SODA'19] shows that to compute a $Δ+1$ coloring of the graph, where $Δ$ denotes the maximum degree, it suffices if each node limits its color choice to $O(\log n)$ independently sampled colors in $\{1, 2, \dots, Δ+1\}$. They showed that it is possible to color the resulting sparsified graph -- the spanning subgraph with edges between neighbors that sampled a common color, which are only $\tilde{O}(n)$ edges -- and obtain a $Δ+1$ coloring for the original graph. However, to compute the actual coloring, that information must be gathered at a single location for centralized processing. We seek instead a local algorithm to compute such a coloring in the sparsified graph. The question is if this can be achieved in $\operatorname{poly}(\log n)$ distributed rounds with small messages. Our main result is an algorithm that computes a $Δ+1$-coloring after palette sparsification with $O(\log^2 n)$ random colors per node and runs in $O(\log^2 Δ+ \log^3 \log n)$ rounds on the sparsified graph, using $O(\log n)$-bit messages. We show that this is close to the best possible: any distributed $Δ+1$-coloring algorithm that runs in the LOCAL model on the sparsified graph, given by palette sparsification, for any $\operatorname{poly}(\log n)$ colors per node, requires $Ω(\log Δ/ \log\log n)$ rounds. This distributed palette sparsification result leads to the first $\operatorname{poly}(\log n)$-round algorithms for $Δ+1$-coloring in two previously studied distributed models: the Node Capacitated Clique, and the cluster graph model.