8. A system comprising: a processor; and a computer-readable storage medium having instructions stored which, when executed by the processor, result in the processor performing operations comprising: identifying an acoustic model, wherein the acoustic model is trained on native speech in a target dialect; 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 a class of a speaker.
10. The system of claim 8 , wherein the native speech represents the class of the speaker.