Hierarchical Phrase-Based Translation with Jane 2

In this paper, we give a survey of several recent extensions to hierarchical phrase-based machine translation that have been implemented in version 2 of Jane, RWTH’s open source statistical machine translation toolkit. We focus on the following techniques: Insertion and deletionmodels, lexical scoring variants, reordering extensionswith non-lexicalized reordering rules and with a discriminative lexicalized reordering model, and soft string-to-dependency hierarchical machine translation. We describe the fundamentals of each of these techniques and present experimental results obtained with Jane 2 to confirm their usefulness in state-ofthe-art hierarchical phrase-based translation (HPBT).