5. The non-transitory computer-readable storage medium of claim 1 , wherein the program instructions are further computer-executable to implement: for a second source, generating another model for each word of the plurality of words; and constraining the other models according to the high level information.
5. The non-transitory computer-readable storage medium of claim 1 , wherein the program instructions are further computer-executable to implement: for a second source, generating another model for each word of the plurality of words; and constraining the other models according to the high level information. 6. The non-transitory computer-readable storage medium of claim 5 , wherein the program instructions are further computer-executable to implement combining the models and the other models into a single composite model.