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We first describe the automatic conversion of the French Treebank (Abeillé and Barrier, 2004), a constituency treebank, into typed projective dependency trees. In order to evaluate the overall quality of the resulting dependency treebank, and to quantify the cases where the projectivity constraint leads to wrong dependencies, we compare a subset of the(More)
We present a semi-supervised method to improve statistical parsing performance. We focus on the well-known problem of lexical data sparseness and present experiments of word clustering prior to parsing. We use a combination of lexicon-aided morphological clustering that preserves tagging ambiguity, and unsuper-vised word clustering, trained on a large(More)
Cet article présente une technique d'analyse syntaxique statistique à la fois en constituants et en dépendances. L'analyse procède en ajoutant des étiquettes fonctionnelles aux sorties d'un analyseur en constituants, entraîné sur le French Treebank, pour permettre l'extrac-tion de dépendances typées. D'une part, nous spécifions d'un point de vue formel et(More)
This paper reports results on grammatical induction for French. We investigate how to best train a parser on the French Treebank (Abeillé et al., 2003), viewing the task as a trade-off between generaliz-ability and interpretability. We compare, for French, a supervised lexicalized parsing algorithm with a semi-supervised un-lexicalized algorithm (Petrov et(More)
In this paper we introduce a general framework for describing the lexicon of a lexicalised grammar by means of elementary descriptive fragments. The system described hereafter consists of two main components: a control device aimed at controlling how fragments are to be combined together in order to describe meaningful lexical descriptions and a composition(More)
This paper presents preliminary investigations on the statistical parsing of French by bringing a complete evaluation on French data of the main probabilistic lexicalized and unlexicalized parsers first designed on the Penn Treebank. We adapted the parsers on the two existing treebanks of French (Abeillé et al., 2003; Schluter and van Genabith, 2007). To(More)