Search Results for author: Vasileios Charisopoulos

Found 9 papers, 4 papers with code

Robust and differentially private stochastic linear bandits

no code implementations23 Apr 2023 Vasileios Charisopoulos, Hossein Esfandiari, Vahab Mirrokni

In this paper, we study the stochastic linear bandit problem under the additional requirements of differential privacy, robustness and batched observations.

Adversarial Robustness

Reducing Aggregate Electric Vehicle Battery Capacity through Sharing

no code implementations20 Apr 2023 Polina Alexeenko, Vasileios Charisopoulos

More precisely, we consider the problem of minimizing aggregate battery capacity in settings with and without a shared resource subject to the requirement that driver commuting needs are met with high reliability.

Communication-efficient distributed eigenspace estimation with arbitrary node failures

no code implementations31 May 2022 Vasileios Charisopoulos, Anil Damle

We develop an eigenspace estimation algorithm for distributed environments with arbitrary node failures, where a subset of computing nodes can return structurally valid but otherwise arbitrarily chosen responses.

Distributed Computing valid

Communication-efficient distributed eigenspace estimation

1 code implementation5 Sep 2020 Vasileios Charisopoulos, Austin R. Benson, Anil Damle

Spectral methods are a collection of such problems, where solutions are orthonormal bases of the leading invariant subspace of an associated data matrix, which are only unique up to rotation and reflections.

Distributed Computing

Entrywise convergence of iterative methods for eigenproblems

1 code implementation NeurIPS 2020 Vasileios Charisopoulos, Austin R. Benson, Anil Damle

Several problems in machine learning, statistics, and other fields rely on computing eigenvectors.

Stochastic algorithms with geometric step decay converge linearly on sharp functions

1 code implementation22 Jul 2019 Damek Davis, Dmitriy Drusvyatskiy, Vasileios Charisopoulos

In this work, we ask whether geometric step decay similarly improves stochastic algorithms for the class of sharp nonconvex problems.

Retrieval

Composite optimization for robust blind deconvolution

1 code implementation6 Jan 2019 Vasileios Charisopoulos, Damek Davis, Mateo Díaz, Dmitriy Drusvyatskiy

The blind deconvolution problem seeks to recover a pair of vectors from a set of rank one bilinear measurements.

A Tropical Approach to Neural Networks with Piecewise Linear Activations

no code implementations22 May 2018 Vasileios Charisopoulos, Petros Maragos

We present a new, unifying approach following some recent developments on the complexity of neural networks with piecewise linear activations.

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