3. The computer-implemented method of claim 2 , wherein determining, from the candidate parses of the command sentence, an action to be performed in response to the command sentence comprises: for each candidate parse, generating an action score for the parse; and selecting the particular action associated with the candidate parse having a highest action score relative to the actions scores for the other candidate parses.
4. The computer-implemented method of claim 3 , wherein generating an action score for a candidate parse comprises: for each lattice span determined for a candidate parse, determining a lattice parse score; and determining the action score for the candidate parse based on the lattice parse scores.