TopicRank : ordonnancement de sujets pour l'extraction automatique de termes-clés

RESUME. Les termes-cles sont les mots ou les expressions polylexicales qui representent le contenu principal d’un document. Ils sont utiles pour diverses applications telles que l’indexation automatique ou le resume automatique, mais ne sont cependant pas disponibles pour la plupart des documents. La quantite de ces documents etant de plus en plus importante, l’extraction manuelle des termes-cles n’est pas envisageable et la tâche d’extraction automatique de termes-cles suscite alors l’interet des chercheurs. Dans cet article nous presentons TopicRank, une methode non supervisee a base de graphe pour l’extraction de termes-cles. Cette methode groupe les termes-cles candidats en sujets, ordonne les sujets et extrait de chacun des meilleurs sujets le terme-cle candidat qui le represente le mieux. Les experiences realisees montrent une amelioration significative vis-a-vis de l’etat de l’art des methodes a base de graphe pour l’extraction non supervisee de termes-cles.

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