8. The non-transitory computer-readable storage medium of claim 1 , wherein the set of predicted acoustic model parameters of the second target unit comprises a set of statistical parameters of predicted acoustic features of the second target unit.
8. The non-transitory computer-readable storage medium of claim 1 , wherein the set of predicted acoustic model parameters of the second target unit comprises a set of statistical parameters of predicted acoustic features of the second target unit. 9. The non-transitory computer-readable storage medium of claim 8 , wherein the set of predicted acoustic model parameters includes a mean of the predicted acoustic features of the second target unit and a variance of the predicted acoustic features of the second target unit.