Sanne Korzec wrote:

> I have a question on lexical weighting from the paper: philipp  
> koehn, och, marcu. Statistical Phrase Based Translation. On page 5,  
> subsection 4.4 Lexical weighting, an example is given how to compute  
> lexical weights.

...

> But then, how can source word f2 be mapped to two target words?  
> Viterbi alignments only allow each source word to be mapped to one  
> target word. What’s going on here?

I haven't refreshed my memory of that paper, but I suspect these  
alignments are after symmetrization, where the Viterbi alignments from  
both directions are (heuristically) merged.  This often produces many- 
to-many alignments.

- John D. Burger
   MITRE


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