This is a great list, but I would add Och & Ney (CL 2003), which, in addition to synthesizing the papers below, contains substantial discussion and comprehensive experimental results on the benefits of modeling reordering. http://aclweb.org/anthology-new/J/J03/J03-1002.pdf
On Sat, Oct 31, 2009 at 7:56 PM, Chris Dyer <[email protected]> wrote: > Modeling reordering is usually helpful, even during alignment. This > is especially true for lexical translation models (where words are > generated by other words, rather than phrases being generated from > other phrases). The reordering models don't have to be particularly > complicated to achieve quite good results (especially in languages > that have similar structures, like English and French). For a fairly > basic introduction to modeling reordering (or not) in alignment > models, the Peter Brown et al (1993) paper (the Mathematics of > Statistical Machine Translation), which describes IBM models 1 and 2 > is a fine place to start. For further examples that focus just on > alignment, add the HMM alignment model papers (Vogel et al 1996 and/or > Och and Ney 1999). > > Chris > > On Sat, Oct 31, 2009 at 3:35 PM, Mark Fishel <[email protected]> wrote: >> Dear list members, >> >> I have a general theoretical question: if a word alignment model is >> only used to generate the viterbi alignment of the data for further >> usage (like it is the case with Moses'es phrase-based translation), is >> it necessary or at all useful to model reordering/distortion in the >> word alignment phase? Naturally if a word alignment model is later >> used for decoding to generate a new output, reordering is crucial; but >> how about in case of phrase-based translation used by Moses, where >> even lexicalized reordering is learned based on the symmetrical >> alignment matrices? Does modelling the reordering make the learning >> more robust/stable? Are there any experiments or articles dealing with >> this question? >> >> Hope this isn't a troll question :) >> >> Mark Fishel >> Dept. of Computer Science >> University of Tartu >> _______________________________________________ >> Moses-support mailing list >> [email protected] >> http://mailman.mit.edu/mailman/listinfo/moses-support >> > _______________________________________________ > Moses-support mailing list > [email protected] > http://mailman.mit.edu/mailman/listinfo/moses-support > _______________________________________________ Moses-support mailing list [email protected] http://mailman.mit.edu/mailman/listinfo/moses-support
