Hi Linh,

> In some cases, when the training data is very large, the decoder output 
> *-inf*  in nbest list score ( as in the 1st entry)
>  or *nan *score (as in the 2nd entry)

Are you using the latest version of moses? A problem related to infinite
lexical distortion scores, which is what you seem to have, was fixed a
few weeks ago. They have to do with probabilities in the lexical
reordering table getting rounded down to zero by the training script.
Are there any zero scores in your reordering table?

If you use binary reordering tables produced by an old version of
processLexicalTable from tables containing zero scores, you'll also
have to rebuild them with a more recent version of the tool.

Cheers,
Christian
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