Search Results for author: Haris Pozidis

Found 5 papers, 0 papers with code

WannaLaugh: A Configurable Ransomware Emulator -- Learning to Mimic Malicious Storage Traces

no code implementations12 Mar 2024 Dionysios Diamantopolous, Roman Pletka, Slavisa Sarafijanovic, A. L. Narasimha Reddy, Haris Pozidis

Our results show that these models are effective in detecting ransomware, highlighting the practical application of our emulator in developing responsible cybersecurity tools.

Graph Feature Preprocessor: Real-time Extraction of Subgraph-based Features from Transaction Graphs

no code implementations13 Feb 2024 Jovan Blanuša, Maximo Cravero Baraja, Andreea Anghel, Luc von Niederhäusern, Erik Altman, Haris Pozidis, Kubilay Atasu

In this paper, we present "Graph Feature Preprocessor", a software library for detecting typical money laundering and fraud patterns in financial transaction graphs in real time.

Breadth-first, Depth-next Training of Random Forests

no code implementations15 Oct 2019 Andreea Anghel, Nikolas Ioannou, Thomas Parnell, Nikolaos Papandreou, Celestine Mendler-Dünner, Haris Pozidis

In this paper we analyze, evaluate, and improve the performance of training Random Forest (RF) models on modern CPU architectures.

Weighted Sampling for Combined Model Selection and Hyperparameter Tuning

no code implementations16 Sep 2019 Dimitrios Sarigiannis, Thomas Parnell, Haris Pozidis

In this work, we propose a novel sampling distribution as an alternative to uniform sampling and prove theoretically that it has a better chance of finding the best configuration in a worst-case setting.

Model Selection Two-sample testing

Large-Scale Stochastic Learning using GPUs

no code implementations22 Feb 2017 Thomas Parnell, Celestine Dünner, Kubilay Atasu, Manolis Sifalakis, Haris Pozidis

In this work we propose an accelerated stochastic learning system for very large-scale applications.

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