Can inversion transduction grammars generate hand alignments
Anders Søgaard · 2010
The adequacy of inversion transduction grammars (ITGs) has been widely debated, and the discussion’s crux seems to be whether the search space is inclusive enough (Zens and Ney, 2003; Wellington et al., 2006; Søgaard and Wu, 2009). Parse failure rate when parses are constrained by word alignments is one metric that has been used, but no one has studied parse failure rates of the full class of ITGs on representative hand aligned corpora. It has also been noted that ITGs in Chomsky normal form induce strictly less alignments than ITGs (Søgaard and Wu, 2009). This study is the first study that directly compares parse failure rates for this subclass and the full class of ITGs. 1