13. The computer program product of claim 12 , wherein providing the input to the neural network comprises: providing, by the one or more computers, input to the neural network that includes a sequence of phonetic units that form a phonetic representation of the text in the first language.
13. The computer program product of claim 12 , wherein providing the input to the neural network comprises: providing, by the one or more computers, input to the neural network that includes a sequence of phonetic units that form a phonetic representation of the text in the first language. 15. The computer program product of claim 13 , wherein the operations further comprise identifying one or more groups of phonetic units from among the sequence of phonetic units that form the phonetic representation of the text in the first language; and wherein providing, by the one or more computers, input to the neural network, comprises providing, by the one or more computers, input to the neural network that includes (i) the sequence of phonetic units that form the phonetic representation of the text in the first language, (ii) the language identifier for the first language, and (iii) data indicating the one or more groups of phonetic units.