Search Results for author: Panagiotis Papapetrou

Found 15 papers, 8 papers with code

Counterfactual Explanations for Time Series Forecasting

1 code implementation12 Oct 2023 Zhendong Wang, Ioanna Miliou, Isak Samsten, Panagiotis Papapetrou

In this paper, we formulate the novel problem of counterfactual generation for time series forecasting, and propose an algorithm, called ForecastCF, that solves the problem by applying gradient-based perturbations to the original time series.

counterfactual Time Series +1

Style-transfer counterfactual explanations: An application to mortality prevention of ICU patients

1 code implementation Artificial Intelligence in Medicine 2023 Zhendong Wang, Isak Samsten, Vasiliki Kougia, Panagiotis Papapetrou

In this paper, we propose a counterfactual solution MedSeqCF for preventing the mortality of three cohorts of ICU patients, by representing their electronic health records as medical event sequences, and generating counterfactuals by adopting and employing a text style-transfer technique.

counterfactual Counterfactual Explanation +3

FLICU: A Federated Learning Workflow for Intensive Care Unit Mortality Prediction

1 code implementation30 May 2022 Lena Mondrejevski, Ioanna Miliou, Annaclaudia Montanino, David Pitts, Jaakko Hollmén, Panagiotis Papapetrou

Thus, the federated approach can be seen as a valid and privacy-preserving alternative to centralized machine learning for classifying ICU mortality when sharing sensitive patient data between hospitals is not possible.

BIG-bench Machine Learning Binary Classification +6

Energy and Resource Efficiency by User Traffic Prediction and Classification in Cellular Networks

no code implementations2 Nov 2021 Amin Azari, Fateme Salehi, Panagiotis Papapetrou, Cicek Cavdar

There is a lack of research on the analysis of per-user traffic in cellular networks, for deriving and following traffic-aware network management.

feature selection Management +2

Learning Time Series Counterfactuals via Latent Space Representations

1 code implementation International Conference on Discovery Science 2021 Zhendong Wang, Isak Samsten, Rami Mochaourab, Panagiotis Papapetrou

Counterfactual explanations can provide sample-based explanations of features required to modify from the original sample to change the classification result from an undesired state to a desired state; hence it provides interpretability of the model.

counterfactual Counterfactual Explanation +3

Robust Explanations for Private Support Vector Machines

no code implementations7 Feb 2021 Rami Mochaourab, Sugandh Sinha, Stanley Greenstein, Panagiotis Papapetrou

For such classifiers, counterfactual explanations need to be robust against the uncertainties in the SVM weights in order to ensure, with high confidence, that the classification of the data instance to be explained is different than its explanation.

counterfactual

Clinical Predictive Keyboard using Statistical and Neural Language Modeling

no code implementations22 Jun 2020 John Pavlopoulos, Panagiotis Papapetrou

We show that a neural language model can achieve as high as 51. 3% accuracy in radiology reports (one out of two words predicted correctly).

Language Modelling

RTEX: A novel methodology for Ranking, Tagging, and Explanatory diagnostic captioning of radiography exams

1 code implementation11 Jun 2020 Vasiliki Kougia, John Pavlopoulos, Panagiotis Papapetrou, Max Gordon

This paper introduces RTEx, a novel methodology for a) ranking radiography exams based on their probability to contain an abnormality, b) generating abnormality tags for abnormal exams, and c) providing a diagnostic explanation in natural language for each abnormal exam.

Aggregate-Eliminate-Predict: Detecting Adverse Drug Events from Heterogeneous Electronic Health Records

no code implementations13 Jul 2019 Maria Bampa, Panagiotis Papapetrou

The challenge in this work is to aggregate heterogeneous data types involving diagnosis codes, drug codes, as well as lab measurements.

feature selection

Cellular Traffic Prediction and Classification: a comparative evaluation of LSTM and ARIMA

no code implementations3 Jun 2019 Amin Azari, Panagiotis Papapetrou, Stojan Denic, Gunnar Peters

In this paper, we study the problem of network traffic traffic prediction and classification by employing standard machine learning and statistical learning time series prediction methods, including long short-term memory (LSTM) and autoregressive integrated moving average (ARIMA), respectively.

General Classification Time Series +3

Explainable time series tweaking via irreversible and reversible temporal transformations

1 code implementation13 Sep 2018 Isak Karlsson, Jonathan Rebane, Panagiotis Papapetrou, Aristides Gionis

We show that the problem is NP-hard, and focus on two instantiations of the problem, which we refer to as reversible and irreversible time series tweaking.

General Classification Time Series +2

Clustering with Confidence: Finding Clusters with Statistical Guarantees

1 code implementation27 Dec 2016 Andreas Henelius, Kai Puolamäki, Henrik Boström, Panagiotis Papapetrou

In this study, we propose a technique for quantifying the instability of a clustering solution and for finding robust clusters, termed core clusters, which correspond to clusters where the co-occurrence probability of each data item within a cluster is at least $1 - \alpha$.

Clustering

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