Search Results for author: Themis Palpanas

Found 18 papers, 8 papers with code

Graph-Based Vector Search: An Experimental Evaluation of the State-of-the-Art

no code implementations8 Feb 2025 Ilias Azizi, Karima Echihabi, Themis Palpanas

Vector data is prevalent across business and scientific applications, and its popularity is growing with the proliferation of learned embeddings.

Dive into Time-Series Anomaly Detection: A Decade Review

1 code implementation29 Dec 2024 Paul Boniol, Qinghua Liu, Mingyi Huang, Themis Palpanas, John Paparrizos

Recent advances in data collection technology, accompanied by the ever-rising volume and velocity of streaming data, underscore the vital need for time series analytics.

Anomaly Detection Time Series +1

Data Quality Awareness: A Journey from Traditional Data Management to Data Science Systems

no code implementations5 Nov 2024 Sijie Dong, Soror Sahri, Themis Palpanas

In this paper, we present a comprehensive review of the evolution of data quality (DQ) awareness from traditional data management systems to modern data-driven AI systems, which are integral to data science.

Management

Analysing Multi-Task Regression via Random Matrix Theory with Application to Time Series Forecasting

no code implementations14 Jun 2024 Romain Ilbert, Malik Tiomoko, Cosme Louart, Ambroise Odonnat, Vasilii Feofanov, Themis Palpanas, Ievgen Redko

In this paper, we introduce a novel theoretical framework for multi-task regression, applying random matrix theory to provide precise performance estimations, under high-dimensional, non-Gaussian data distributions.

Hyperparameter Optimization Multi-Task Learning +3

SAMformer: Unlocking the Potential of Transformers in Time Series Forecasting with Sharpness-Aware Minimization and Channel-Wise Attention

1 code implementation15 Feb 2024 Romain Ilbert, Ambroise Odonnat, Vasilii Feofanov, Aladin Virmaux, Giuseppe Paolo, Themis Palpanas, Ievgen Redko

Transformer-based architectures achieved breakthrough performance in natural language processing and computer vision, yet they remain inferior to simpler linear baselines in multivariate long-term forecasting.

Time Series Time Series Forecasting

ADF & TransApp: A Transformer-Based Framework for Appliance Detection Using Smart Meter Consumption Series

1 code implementation17 Dec 2023 Adrien Petralia, Philippe Charpentier, Themis Palpanas

The experimental results with two large real datasets show that the proposed approach outperforms current solutions, including state-of-the-art time series classifiers applied to appliance detection.

Time Series Time Series Classification

Breaking Boundaries: Balancing Performance and Robustness in Deep Wireless Traffic Forecasting

no code implementations16 Nov 2023 Romain Ilbert, Thai V. Hoang, Zonghua Zhang, Themis Palpanas

Our optimal model can retain up to $92. 02\%$ the performance of the original forecasting model in terms of Mean Squared Error (MSE) on clean data, while being more robust than the standard adversarially trained models on perturbed data.

Computational Efficiency Time Series Forecasting

A Hierarchical Transformer Encoder to Improve Entire Neoplasm Segmentation on Whole Slide Image of Hepatocellular Carcinoma

no code implementations11 Jul 2023 Zhuxian Guo, Qitong Wang, Henning Müller, Themis Palpanas, Nicolas Loménie, Camille Kurtz

In digital histopathology, entire neoplasm segmentation on Whole Slide Image (WSI) of Hepatocellular Carcinoma (HCC) plays an important role, especially as a preprocessing filter to automatically exclude healthy tissue, in histological molecular correlations mining and other downstream histopathological tasks.

Segmentation

A Critical Re-evaluation of Benchmark Datasets for (Deep) Learning-Based Matching Algorithms

1 code implementation3 Jul 2023 George Papadakis, Nishadi Kirielle, Peter Christen, Themis Palpanas

Entity resolution (ER) is the process of identifying records that refer to the same entities within one or across multiple databases.

Entity Resolution

Appliance Detection Using Very Low-Frequency Smart Meter Time Series

1 code implementation10 May 2023 Adrien Petralia, Philippe Charpentier, Paul Boniol, Themis Palpanas

This paper presents an in-depth evaluation and comparison of state-of-the-art time series classifiers applied to detecting the presence/absence of diverse appliances in very low-frequency smart meter data.

Meter Reading Time Series +1

dCAM: Dimension-wise Class Activation Map for Explaining Multivariate Data Series Classification

1 code implementation25 Jul 2022 Paul Boniol, Mohammed Meftah, Emmanuel Remy, Themis Palpanas

Convolutional neural networks perform well for the data series classification task; though, the explanations provided by this type of algorithm are poor for the specific case of multivariate data series.

Classification Explainable Models +2

Series2Graph: Graph-based Subsequence Anomaly Detection for Time Series

no code implementations25 Jul 2022 Paul Boniol, Themis Palpanas

Subsequence anomaly detection in long sequences is an important problem with applications in a wide range of domains.

Anomaly Detection Time Series +1

SentiQ: A Probabilistic Logic Approach to Enhance Sentiment Analysis Tool Quality

no code implementations19 Aug 2020 Wissam Maamar Kouadri, Salima Benbernou, Mourad Ouziri, Themis Palpanas, Iheb Ben Amor

The opinion expressed in various Web sites and social-media is an essential contributor to the decision making process of several organizations.

Decision Making Sentiment Analysis

Progressive Data Science: Potential and Challenges

no code implementations19 Dec 2018 Cagatay Turkay, Nicola Pezzotti, Carsten Binnig, Hendrik Strobelt, Barbara Hammer, Daniel A. Keim, Jean-Daniel Fekete, Themis Palpanas, Yunhai Wang, Florin Rusu

We discuss these challenges and outline first steps towards progressiveness, which, we argue, will ultimately help to significantly speed-up the overall data science process.

Node Classification in Uncertain Graphs

no code implementations22 May 2014 Michele Dallachiesa, Charu Aggarwal, Themis Palpanas

We study the novel problem of node classification in uncertain graphs, by treating uncertainty as a first-class citizen.

Classification General Classification +1

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