Such diverse topics as machine translation (Dyer et al., 2008; Dyer and Resnik, 2010; Mi et al., 2008), part-of-speech tagging (Jiang et al., 2008), named entity recognition (Finkel and Manning, 2009) semantic role labelling (Sutton and McCallum, 2005; Finkel et al., 2006), and others have also been improved by combined models.

We supply gold-standard part-of-speech tags to the parsers.

Next, we evaluate performance when using automatic part-of-speech tags as input to our parser

Prior work incorporating parse structure into machine translation (Chiang, 2010) and Semantic Role Labeling (Tsai et al., 2005; Punyakanok et al., 2008) indicate that such hierarchical structure can have great benefit over shallow labeling techniques like chunking and part-of-speech tagging .

The feature vector :13 is encoded with the chart cell’s absolute and relative span width, as well as unigram and bigram lexical and part-of-speech tag items from wi_1 .

Figure 4 contains a timing comparison of the three components of our final parser: Boundary FOM initialization (which includes the forward-backward algorithm over ambiguous part-of-speech tags ), beam-

This is due to the fact that for the source-tag based approach, a given chart cell in the CYK decoder, represented by a start and end position in the source sentence, almost uniquely determines the nonterminal any hypothesis in this cell can have: Disregarding part-of-speech tag ambiguity and phrase size accounting, that nonterminal will be the composition of the tags of the start and end source words spanned by that cell.

Extension to a bilingually tagged corpus While the availability of syntactic annotations for both source and target language is unlikely in most translation scenarios, some form of word tags, be it part-of-speech tags or learned word clusters (cf.

Consider again our example sentence pair (now also annotated with source-side part-of-speech tags ):