13. The system of the claim 12 , wherein for each action, generating a training set of command sentences from the corresponding set of command sentences includes removing each n-gram from each sentence in the corresponding set of command sentences for the action that is also not a first n-gram for the action.
17. The system of claim 13 , wherein: each command model is a grammar rule model; and applying the command models to the input sentence of n-grams comprises, for each grammar rule model, parsing the input sentence of n-grams.