Groupe de travail MINERS

Description :
Data Mining Team of LIMOS

Responsable communication :
MBOUOPDA Michael Franklin

Miners team during the Covid19 - May 20, 2020 - SEMINAIRE

Accepted Paper at FUZZ-IEEE2020: Categorical fuzzy entropy c-means - May 8, 2020 - PUBLICATION

Authors: Abdoul Jalil Djiberou Mahamadou, Violaine Antoine and Engelbert Mephu Nguifo and Sylvain Moreno

Abstract: Hard and fuzzy clustering algorithms are part of the partition-based clustering family. They are widely used in real-world applications to cluster numerical and categorical data. While in hard clustering an object is assigned to a cluster with certainty, in fuzzy clustering an object can be assigned to different clusters given a membership degree. For both types of method an entropy can be incorporated into the objective function, mostly to avoid solutions raising too much uncertainties. In this paper, we present an extension of a fuzzy clustering method for categorical data using fuzzy centroids. The new algorithm, referred to as Categorical Fuzzy Entropy (CFE), integrates an entropy term in the objective function. This allows a better fuzzification of the cluster prototypes. Experiments on ten real-world data sets and statistical comparisons show that the new method can efficiently handle categorical data.

Acticle accepté à CNIA2020: Classification des Séries Temporelles Incertaines par Transformation Shapelet - May 6, 2020 - PUBLICATION

Auteurs: Michael Franklin MBOUOPDA et Engelbert MEPHU NGUIFO

Résumé: La classification des séries temporelles est une tâche qui consiste à classifier les données chronologiques. Elle est utilisée dans divers domaines tels que la météorologie, la médecine et la physique. Plusieurs techniques performantes ont été proposées durant les dix dernières années pour accomplir cette tâche. Cependant, elles ne prennent pas explicitement en compte l’incertitude dans les données. En utilisant la propagation de l’incertitude, nous proposons une nouvelle mesure de dissimilarité incertaine basée sur la distance euclidienne. Nous montrons également comment faire la classification de séries temporelles incertaines en couplant cette mesure avec la méthode de transformation shapelet, l’une des méthodes les plus performantes pour cette tâche. Une évaluation expérimentale de notre contribution est faite sur le dépôt de données temporelles UCR.

Accepted Paper at FUZZ-IEEE 2019: Evidential clustering for categorical data - May 6, 2020 - PUBLICATION

Author: A. J. Djiberou Mahamadou, V. Antoine, G. J. Christie and S. Moreno

Abstract: Evidential clustering methods assign objects to clusters with a degree of belief, allowing for better representation of cluster overlap and outliers. Based on the theoretical framework of belief functions, they generate credal partitions which extend crisp, fuzzy and possibilistic partitions. Despite their ability to provide rich information about the partition, no evidential clustering algorithm for categorical data has yet been proposed. This paper presents a categorical version of ECM, an evidential variant of k-means. The proposed algorithm, referred to as catECM, considers a new dissimilarity measure and introduces an alternating minimization scheme in order to obtain a credal partition. Experimental results with real and synthetic data sets show the potential and the efficiency of cat-ECM for clustering categorical data.

NeuroDeRisk - Semi annual meeting - April 28, 2020 - SEMINAIRE

Semi-annual face-to-face meeting of the European project NeuroDeRisk , initially planned in Brussels, but held in web conference because of COVID-19.
A meeting to discuss the last 6 months deliverables and futur ones.

Nouvel article publié dans la revue Pattern Recognition - March 20, 2020 - PUBLICATION

Remise des écharpes docteurs 2020 - Feb. 4, 2020 - SEMINAIRE

Nos nouveaux docteurs en informatique Dr. Angeline PLAUD et Dr. Jocelyn DE GOËR, tous deux encadrés par Prof. Engelbert MEPHU NGUIFO

Next meeting speakers

Thursday, 09 July 2020, 2:00 pm

Speaker: Valentin

Topic: Prosentation of his internship's project

Thursday, 16 July 2020, 2:00 pm

Speaker: Falih's student

Topic: to be defined