8. A system comprising: a processor; and a computer-readable storage medium having instructions stored which, when executed by the processor, result in the processor performing operations comprising: overgenerating potential pronunciations by converting portions of symbolic input into a number of possible lexical pronunciation variants based on an established set of conversion rules, wherein the symbolic input comprises labeled speech data; selecting pronunciations in a speech recognition context from the potential pronunciations, to yield selected potential pronunciations; retraining the established set of conversion rules based on the selected potential pronunciations to yield a retrained set of conversion rules; and processing speech based on the retrained set of conversion rules.
8. A system comprising: a processor; and a computer-readable storage medium having instructions stored which, when executed by the processor, result in the processor performing operations comprising: overgenerating potential pronunciations by converting portions of symbolic input into a number of possible lexical pronunciation variants based on an established set of conversion rules, wherein the symbolic input comprises labeled speech data; selecting pronunciations in a speech recognition context from the potential pronunciations, to yield selected potential pronunciations; retraining the established set of conversion rules based on the selected potential pronunciations to yield a retrained set of conversion rules; and processing speech based on the retrained set of conversion rules. 11. The system of claim 8 , wherein the computer-readable storage medium has additional instructions stored which, when executed by the processor, result in the processor performing operations comprising iteratively performing the overgenerating, the selecting, and the retraining.