19. The computing system of claim 17 , wherein each of the plurality of training computing devices applying the weak acoustic model, the language model, and the weight vector to the respective selected partitions of reference utterances produces respective weight vector adjustments.
19. The computing system of claim 17 , wherein each of the plurality of training computing devices applying the weak acoustic model, the language model, and the weight vector to the respective selected partitions of reference utterances produces respective weight vector adjustments. 22. The computing system of claim 19 , wherein the at least one combining computing device is configured to calculate a moving average over the weight vector and the respective weight vector adjustments to update the weight vector.