13. The non-transitory computer-readable storage medium of claim 1 , wherein the likelihood score represents a likelihood of the set of acoustic features of the second candidate speech segment given the set of predicted acoustic model parameters of the second target unit and the set of acoustic features of the first candidate speech segment.
13. The non-transitory computer-readable storage medium of claim 1 , wherein the likelihood score represents a likelihood of the set of acoustic features of the second candidate speech segment given the set of predicted acoustic model parameters of the second target unit and the set of acoustic features of the first candidate speech segment. 14. The non-transitory computer-readable storage medium of claim 13 , wherein the likelihood score is determined by a Gaussian Mixture Model using the set of acoustic features of the second candidate speech segment as an observed set of acoustic features.