The Berkeley Parser at the EVALITA 2009 Constituency Parsing Task

In this paper we describe our participation at the EVALITA 2009 Constituency Parsing Task. We used the Berkeley Parser, obtaining the best F1, that is 78.73. This result corresponds to an increment of 15.85% with respect to the best result obtained at EVALITA 2007 by the Bikel`s parser (F1 = 67.96). A further important advantage of the Berkeley parser is that it does not require any language adaptation in addition to the need of retraining it on the new treebank. For comparison, we also report the results obtained by the Bikel`s parser on the 2009 treebank.