15. A computer-readable storage device having instructions stored which, when executed by a computing device, cause the computing device to perform operations comprising: identifying an acoustic model, wherein the acoustic model is trained on native speech in a target dialect; identifying a class of a speaker; and replacing a phoneme in the acoustic model with a modified phoneme, wherein the modified phoneme is a weighted sum of plausible phonemes in a lattice of plausible phonemes associated with the class of the speaker.
15. A computer-readable storage device having instructions stored which, when executed by a computing device, cause the computing device to perform operations comprising: identifying an acoustic model, wherein the acoustic model is trained on native speech in a target dialect; identifying a class of a speaker; and replacing a phoneme in the acoustic model with a modified phoneme, wherein the modified phoneme is a weighted sum of plausible phonemes in a lattice of plausible phonemes associated with the class of the speaker. 17. The computer-readable storage device of claim 15 , wherein the native speech represents the class of the speaker.