Elementary Trees For Syntactic And Statistical Disambiguation
Rodolfo Delmonte, Luminita Chiran, Ciprian Bacalu · 2000
In this paper we argue in favour of an integration between statistically and syntactically based parsing, where syntax is intended in terms of shallow parsing with elementary trees. None of the statistically based analyses produce an accuracy level comparable to the one obtained by means of linguistic rules [1]. Of course their data are strictly referred to English, with the exception of [2, 3, 4]. As to Italian, purely statistically based approaches are inefficient basically due to great sparsity of tag distribution -- 50% or less of unambiguous tags when punctuation is subtracted from the total count as reported by [5]. We shall discuss our general statistical and syntactic framework and then we shall report on an experiment with four different setups: the first two approaches are bottom-up driven, i.e. from local tag combinations: