Hi Cristina If you add extra features but give them zero weight then they shouldn't affect the overall score, and so shouldn't affect the translation. Try running moses with '-v 2' to see the translation options and check that the extra features are being loaded as you intended,
cheers - Barry On 25/07/12 17:24, Cristina wrote: > Dear all, > > We are doing some experiments by adding new features at phrase level in > the translation table. We have done a first experiment to see the effects > and they are quite weird: > > * We build a translation table with 9 features and a similar translation > table with 18 features (the same 9 features + 9 new features) > > * We run MERT (or MIRA) on a dev set using the first translation table (9 > features) > > * We translate a test set with 2 configurations: > - MERT on 9 features using the translation table with 9 features > - MERT on 9 features using the translation table with 18 features (9 + > 9) where the weight for the 9 extra features is set to 0 > > We loose more than 3 points of BLEU with the second configuration with > respect to the first one. (Using MERT on the 18 features gives similar > results to the second configuration) > > Does anyone know if there is some penalty when adding more features? Or > has anyone encountered the same problem? > Thanks in advance! > > Best, > > Cristina > _______________________________________________ > 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
