Hi, It seems to me that this toy string-to-tree setup is either outdated, or it always had issues. It should be replaced.
Under real-world conditions, the decoder should always be able to produce some hypothesis. We would therefore usually extract a whole set of glue rules. And we would typically also add an [unknown-lhs] section to the moses.ini that would tell the decoder which left-hand side non -terminal labels to use for out-of-vocabulary words. To my knowledge, these two techniques are crucial for being able to parse any input sentence provided to the chart decoder in syntax-based translation. So, in my opinion, the problem is most likely neither the server implementation nor the syntax-based decoder, but a problematic setup. I would consider it okay for the server to crash (or at least print a warning) under such circumstances. You don't want it to silently not translate complete sentences. (I must admit that I didn't look into it in too much detail, but it sho uld be easy to confirm.) Cheers, Matthias On Fri, 2016-01-29 at 20:28 +0000, Barry Haddow wrote: > Hi All > > I think I see what happened now. > > When you give the input "dies ist ein haus" to the sample model, the > "dies" is unknown, and there is no translation. The server did not check > for this condition, and got a seg fault. I have added a check, so if you > pull and try again it should not crash. > > In the log pasted by Martin, he passed "das ist ein haus" to > command-line Moses, which works, and gives a translation. > > I think ideally the sample models should handle unknown words, and give > a translation. Maybe adding a glue rule would be sufficient? > > cheers - Barry > > On 29/01/16 11:13, Barry Haddow wrote: > > Hi > > > > When I run command-line Moses, I get the output below - i.e. no best > > translation. The server crashes for me since it does not check for the > > null pointer, but the command-line version does. > > > > I think there should be a translation for this example. > > > > cheers - Barry > > > > [gna]bhaddow: echo 'dies ist ein haus' | ~/moses.new/bin/moses -f > > string-to-tree/moses.ini > > Defined parameters (per moses.ini or switch): > > config: string-to-tree/moses.ini > > cube-pruning-pop-limit: 1000 > > feature: KENLM name=LM factor=0 order=3 num-features=1 > > path=lm/europarl.srilm.gz WordPenalty UnknownWordPenalty > > PhraseDictionaryMemory input-factor=0 output-factor=0 > > path=string-to-tree/rule-table num-features=1 table-limit=20 > > input-factors: 0 > > inputtype: 3 > > mapping: 0 T 0 > > max-chart-span: 20 1000 > > non-terminals: X S > > search-algorithm: 3 > > translation-details: translation-details.log > > weight: WordPenalty0= 0 LM= 0.5 PhraseDictionaryMemory0= 0.5 > > line=KENLM name=LM factor=0 order=3 num-features=1 path=lm/europarl.srilm.gz > > Loading the LM will be faster if you build a binary file. > > Reading lm/europarl.srilm.gz > > ----5---10---15---20---25---30---35---40---45---50---55---60---65---70---75---80---85---90---95--100 > > **The ARPA file is missing . Substituting log10 probability -100.000. > > ************************************************************************************************** > > FeatureFunction: LM start: 0 end: 0 > > line=WordPenalty > > FeatureFunction: WordPenalty0 start: 1 end: 1 > > line=UnknownWordPenalty > > FeatureFunction: UnknownWordPenalty0 start: 2 end: 2 > > line=PhraseDictionaryMemory input-factor=0 output-factor=0 > > path=string-to-tree/rule-table num-features=1 table-limit=20 > > FeatureFunction: PhraseDictionaryMemory0 start: 3 end: 3 > > Loading LM > > Loading WordPenalty0 > > Loading UnknownWordPenalty0 > > Loading PhraseDictionaryMemory0 > > Start loading text phrase table. Moses format : [3.038] seconds > > Reading string-to-tree/rule-table > > ----5---10---15---20---25---30---35---40---45---50---55---60---65---70---75---80---85---90---95--100 > > **************************************************************************************************** > > max-chart-span: 20 > > Created input-output object : [3.041] seconds > > Line 0: Initialize search took 0.000 seconds total > > Translating: dies ist ein haus ||| [0,0]=X (1) [0,1]=X (1) > > [0,2]=X (1) [0,3]=X (1) [0,4]=X (1) [0,5]=X (1) [1,1]=X (1) [1,2]=X (1) > > [1,3]=X (1) [1,4]=X (1) [1,5]=X (1) [2,2]=X (1) [2,3]=X (1) [2,4]=X (1) > > [2,5]=X (1) [3,3]=X (1) [3,4]=X (1) [3,5]=X (1) [4,4]=X (1) [4,5]=X (1) > > [5,5]=X (1) > > > > 0 1 2 3 4 5 > > 0 1 2 2 1 0 > > 0 0 0 2 0 > > 0 0 4 0 > > 0 0 0 > > 0 0 > > 0 > > Line 0: Additional reporting took 0.000 seconds total > > Line 0: Translation took 0.002 seconds total > > Translation took 0.000 seconds > > Name:moses VmPeak:74024 kB VmRSS:11084 kB RSSMax:36832 kB > > user:2.972 sys:0.048 CPU:3.020 real:3.058 > > > > > > On 29/01/16 00:40, Hieu Hoang wrote: > > > If it works ok on the command line but crashes when using the server, > > > then that suggest a server issue. > > > > > > I don't know much about the server code, to be honest. > > > > > > > -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. _______________________________________________ Moses-support mailing list Moses-support@mit.edu http://mailman.mit.edu/mailman/listinfo/moses-support
