this sounds like a bug to me: recasing should just be a mapping from lower-case to mixed-case, with no other changes.
off-hand i can't remember how true casing is done in Moses; if it is baby translation, then forcing monotone reordering should do the trick. well spotted! Miles 2008/6/25 John D. Burger <[EMAIL PROTECTED]>: > Hi - > > The moses recaser appears to essentially be a word-for-word MT model, > with nothing to keep it from reordering. And, in fact, I have found > that it does so, in about 10% of my test sentences. Here's an > example, before and after recasing. Note that it swaps "power" and > "electric". > > the results and based on the quantum 阱 power electric 耦合 > characteristics > of the concept of pressure is the doctrine of research results are > consistent . > > The results and based on the quantum 阱 electric power 耦合 > characteristics > of the concept of pressure is the doctrine of research results are > consistent . Is this to be expected? > > In this case, it's arguably an improvement (although the phrase > "electric power" does not, in fact, occur in the reference > sentence.) In many cases, however, it's doing the wrong thing for my > data - if I score case-insensitively, BLEU actually goes down by a > small amount. > > I found it surprising that the recaser would do more than what its > name suggests. Is this to be expected, and how could I prevent it? > The recaser model does not appear to include a reordering table, but > the moses.ini file does have a single weight for reoerdering, 0.6. > Could I effectively turn off reordering by setting this to 0? > > (This may also be related to a recent question by Scott Olsson: > "preventing reorderings with GIZA++".) > > Thanks. > > - John Burger > MITRE > > _______________________________________________ > Moses-support mailing list > [email protected] > http://mailman.mit.edu/mailman/listinfo/moses-support > > -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.
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