Search Results for author: Tasuku Soma

Found 8 papers, 1 papers with code

Optimal algorithms for group distributionally robust optimization and beyond

no code implementations28 Dec 2022 Tasuku Soma, Khashayar Gatmiry, Stefanie Jegelka

Distributionally robust optimization (DRO) can improve the robustness and fairness of learning methods.

Fairness

Improved Algorithms for Online Submodular Maximization via First-order Regret Bounds

no code implementations NeurIPS 2020 Nicholas Harvey, Christopher Liaw, Tasuku Soma

- For monotone submodular maximization subject to a matroid, we give an efficient algorithm which achieves a (1 − c/e − ε)-regret of O(√kT ln(n/k)) where n is the size of the ground set, k is the rank of the matroid, ε > 0 is a constant, and c is the average curvature.

Tight First- and Second-Order Regret Bounds for Adversarial Linear Bandits

no code implementations NeurIPS 2020 Shinji Ito, Shuichi Hirahara, Tasuku Soma, Yuichi Yoshida

We propose novel algorithms with first- and second-order regret bounds for adversarial linear bandits.

Statistical Learning with Conditional Value at Risk

no code implementations14 Feb 2020 Tasuku Soma, Yuichi Yoshida

For convex and Lipschitz loss functions, we show that our algorithm has $O(1/\sqrt{n})$-convergence to the optimal CVaR, where $n$ is the number of samples.

Feature Attribution As Feature Selection

no code implementations27 Sep 2018 Satoshi Hara, Koichi Ikeno, Tasuku Soma, Takanori Maehara

In this study, we formalize the feature attribution problem as a feature selection problem.

feature selection

Fast greedy algorithms for dictionary selection with generalized sparsity constraints

no code implementations NeurIPS 2018 Kaito Fujii, Tasuku Soma

In dictionary selection, several atoms are selected from finite candidates that successfully approximate given data points in the sparse representation.

Dictionary Learning

Maximally Invariant Data Perturbation as Explanation

1 code implementation19 Jun 2018 Satoshi Hara, Kouichi Ikeno, Tasuku Soma, Takanori Maehara

In adversarial example, one seeks the smallest data perturbation that changes the model's output.

Image Classification

A Generalization of Submodular Cover via the Diminishing Return Property on the Integer Lattice

no code implementations NeurIPS 2015 Tasuku Soma, Yuichi Yoshida

We show that the generalized submodular cover problem can be applied to various problems and devise a bicriteria approximation algorithm.

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