14. The system of claim 13 , wherein: the instructions are further configured to store in the target language model a mapping probability table identifying, for respective mapping probability integers, a mapping probability floating point; and identifying the mapping probability includes: using the mapping probability table, translating, for the translation of the word sequence, the mapping probability floating point into a mapping probability integer; and including the mapping probability integer of the translation in the target language model.
14. The system of claim 13 , wherein: the instructions are further configured to store in the target language model a mapping probability table identifying, for respective mapping probability integers, a mapping probability floating point; and identifying the mapping probability includes: using the mapping probability table, translating, for the translation of the word sequence, the mapping probability floating point into a mapping probability integer; and including the mapping probability integer of the translation in the target language model. 15. The system of claim 14 , wherein the instructions are further configured to: cluster the mapping probability floating points into mapping probability clusters; and for respective clusters, select the mapping probability integer for the word sequences mapped into the target language model.