14. The computer storage medium of claim 13 , wherein the inverse pronunciation model comprises one or more LSTM blocks that receive the phoneme scores and generate an output from the phoneme scores and one or more CTC layers that receive the output from the LSTM blocks and transform the output into the grapheme scores.
15. The computer storage medium of claim 14 , wherein the language model comprises one or more LSTM blocks that receive the grapheme scores and generate an output from the grapheme scores and one or more CTC layers that receive the output from the LSTM blocks and transform the output into the text label scores.