Search Results for author: Evangelia Gergatsouli

Found 5 papers, 1 papers with code

Contextual Pandora's Box

no code implementations26 May 2022 Alexia Atsidakou, Constantine Caramanis, Evangelia Gergatsouli, Orestis Papadigenopoulos, Christos Tzamos

Pandora's Box is a fundamental stochastic optimization problem, where the decision-maker must find a good alternative while minimizing the search cost of exploring the value of each alternative.

Multi-Armed Bandits Stochastic Optimization

Online Learning for Min Sum Set Cover and Pandora's Box

no code implementations10 Feb 2022 Evangelia Gergatsouli, Christos Tzamos

In Pandora's Box, we are presented with $n$ boxes, each containing an unknown value and the goal is to open the boxes in some order to minimize the sum of the search cost and the smallest value found.

Stochastic Optimization

Approximating Pandora's Box with Correlations

no code implementations30 Aug 2021 Shuchi Chawla, Evangelia Gergatsouli, Jeremy McMahan, Christos Tzamos

For distributions of support $m$, UDT admits a $\log m$ approximation, and while a constant factor approximation in polynomial time is a long-standing open problem, constant factor approximations are achievable in subexponential time (arXiv:1906. 11385).

Stochastic Optimization

Learning Augmented Online Facility Location

1 code implementation17 Jul 2021 Dimitris Fotakis, Evangelia Gergatsouli, Themis Gouleakis, Nikolas Patris

We prove that the competitive ratio decreases smoothly from sublogarithmic in the number of demands to constant, as the error, i. e., the total distance of the predicted locations to the optimal facility locations, decreases towards zero.

Black-box Methods for Restoring Monotonicity

no code implementations ICML 2020 Evangelia Gergatsouli, Brendan Lucier, Christos Tzamos

In this work we develop algorithms that are able to restore monotonicity in the parameters of interest.

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