Search Results for author: Nikolas Kantas

Found 8 papers, 4 papers with code

Scalarisation-based risk concepts for robust multi-objective optimisation

1 code implementation16 May 2024 Ben Tu, Nikolas Kantas, Robert M. Lee, Behrang Shafei

Robustification refers to the strategy that is used to marginalise over the uncertainty in the problem.

Random Pareto front surfaces

1 code implementation2 May 2024 Ben Tu, Nikolas Kantas, Robert M. Lee, Behrang Shafei

As a motivating example, we investigate how these statistics can be used within a design of experiments setting, where the goal is to both infer and use the Pareto front surface distribution in order to make effective decisions.

Multi-objective optimisation via the R2 utilities

1 code implementation19 May 2023 Ben Tu, Nikolas Kantas, Robert M. Lee, Behrang Shafei

As part of our work, we show that these utilities are monotone and submodular set functions which can be optimised effectively using greedy optimisation algorithms.

Joint Entropy Search for Multi-objective Bayesian Optimization

1 code implementation6 Oct 2022 Ben Tu, Axel Gandy, Nikolas Kantas, Behrang Shafei

Many real-world problems can be phrased as a multi-objective optimization problem, where the goal is to identify the best set of compromises between the competing objectives.

Bayesian Optimization

On stochastic mirror descent with interacting particles: convergence properties and variance reduction

no code implementations15 Jul 2020 Anastasia Borovykh, Nikolas Kantas, Panos Parpas, Grigorios A. Pavliotis

A second alternative is to use a fixed step-size and run independent replicas of the algorithm and average these.

The sharp, the flat and the shallow: Can weakly interacting agents learn to escape bad minima?

no code implementations10 May 2019 Nikolas Kantas, Panos Parpas, Grigorios A. Pavliotis

As a first step towards understanding this question we formalize it as an optimization problem with weakly interacting agents.

BIG-bench Machine Learning

On Adaptive Estimation for Dynamic Bernoulli Bandits

no code implementations8 Dec 2017 Xue Lu, Niall Adams, Nikolas Kantas

In this paper, we overcome the shortcoming of slow response to change by deploying adaptive estimation in the standard methods and propose a new family of algorithms, which are adaptive versions of $\epsilon$-Greedy, UCB, and Thompson sampling.

Thompson Sampling

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