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This is a patch for GIZA++, which adds the functionality to compute IBM-3 Viterbi alignments in EM-training. To install this software, you first need to acquire and compile the following packages: - GIZA++ http://code.google.com/p/giza-pp/ - CBC (tested with Version 2.4.0) http://www.coin-or.org/projects/Cbc.xml Afterwards, copy the files contained in this patch to the directory where GIZA++ is installed. The files are based on the 2009 release of GIZA++ and contain some extra code for the computation of IBM-3 Viterbi alignments. Finally, you will need to adjust the Makefile so that the program is linked to the CBC binaries. You will need to specify the include directory of CBC and will probably have to add -DHAVE_CONFIG_H to the compiler flags to correctly compile the headers of CBC. Finally, by default the Viterbi alignments are only compared against the hillclimbing alignments, and some statistics are printed on the screen. If you want your training to be actually centered around these alignments, add -DTRAIN_VITERBI to your compiler flags. Tested under 64-bit Suse Linux with g++ 4.4.2 and 4.5.0. NOTE: since the publication of the CoNLL 2012 paper, this package has evolved substantially. In particular, the prior reasoning stage was substantially improved. Also, we note that in the CoNLL 2012 paper we did not respect GIZA++'s fertility limit. So the comparison to hillclimbing is unfair, but otherwise the results are correct. If you feel that correct results should be published, please e-mail the author. This was so far skipped for lack of time.