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<dc:title xml:lang="fr">Recherche de motifs spatio-temporels fréquents dans un grand graphe via des méthodes d’apprentissage profond</dc:title>
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<dc:subject xml:lang="fr">Extraction de motifs fréquents</dc:subject>
<dc:subject xml:lang="fr">Graphes spatio-temporels</dc:subject>
<dc:subject xml:lang="fr">Apprentissage profond</dc:subject>
<dc:subject xml:lang="fr">Apprentissage par renforcement</dc:subject>
<dc:subject xml:lang="en">Frequent Motif Mining</dc:subject>
<dc:subject xml:lang="en">Spatiotemporal Graphs</dc:subject>
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<dcterms:abstract xml:lang="fr">Les graphes sont essentiels pour représenter des relations complexes dans divers domaines. Cette thèse se concentre sur l’extraction de motifs fréquents dans les graphes spatio-temporels, un défi majeur en raison de la complexité algorithmique. Deux approches innovantes sont proposées : Multi-SPMiner, une adaptation de SPMiner pour multigraphes, utilisant un modèle de réseaux convolutionnels pour graphes, et Deep-QMiner, basé sur l’apprentissage par renforcement profond multi-agents. Ces méthodes, testées sur des données synthétiques et réelles, montrent leur efficacité pour extraire des motifs variés, avec une généralisation robuste entre ensembles de données, validant leur pertinence pour l’analyse de graphes complexes.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Graphs are essential tools for representing complex relationships in various fields. This thesis focuses on the extraction of frequent motifs in spatiotemporal graphs, a major challenge due to the algorithmic complexity. Two innovative approaches are proposed: Multi-SPMiner, an adaptation of SPMiner for multigraphs, using a convolutional graph network model, and Deep-QMiner, based on multi-agent deep reinforcement learning. These methods, tested on synthetic and real-world data, demonstrate their effectiveness in extracting diverse motifs, with robust generalization across datasets, validating their relevance for analyzing complex graphs.</dcterms:abstract>
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