Search Results for author: Savvas A. Chatzichristofis

Found 3 papers, 1 papers with code

A distributed, plug-n-play algorithm for multi-robot applications with a priori non-computable objective functions

1 code implementation14 Nov 2021 Athanasios Ch. Kapoutsis, Savvas A. Chatzichristofis, Elias B. Kosmatopoulos

Upon this transformation, we propose a distributed methodology based on the cognitive-based adaptive optimization (CAO) algorithm, that is able to approximate the evolution of each robot's cost function and to adequately optimize its decision variables (robot actions).

Investigating the Vision Transformer Model for Image Retrieval Tasks

no code implementations11 Jan 2021 Socratis Gkelios, Yiannis Boutalis, Savvas A. Chatzichristofis

This paper introduces a plug-and-play descriptor that can be effectively adopted for image retrieval tasks without prior initialization or preparation.

Benchmarking Image Retrieval +1

A Gradient Free Neural Network Framework Based on Universal Approximation Theorem

no code implementations30 Sep 2019 Nikolaos P. Bakas, Andreas Langousis, Mihalis Nicolaou, Savvas A. Chatzichristofis

The proposed algorithm adheres to the underlying theory, is highly fast, and results in remarkably low errors when applied for regression and classification of complex data-sets, such as the Griewank function of multiple variables $\mathbf{x} \in \mathbb{R}^{100}$ with random noise addition, and MNIST database for handwritten digits recognition, with $7\times10^4$ images.

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