... Institute{avaswani,lhuang,chiang}@isi.eduAbstractTwo decades after their invention, the IBMword-based translation models, widely avail-able in the GIZA++ toolkit, remain the dom-inant approach ... combining unlabeled paral-lel text with manually-aligned parallel text (Moore,2005; Taskar et al., 2005; Riesa and Marcu, 2010).Although manually-aligned data is very valuable, itis only available ... to word alignment and an in-tegral part of many statistical translation sys-tems. Although many models have surpassedthem in accuracy, none have supplanted themin practice. In this paper, we...