14. The system of claim 11 , wherein the first neural network has been trained to provide outputs corresponding to multiple context-dependent states that are derived from a plurality of context-independent states using one or more decision trees.
14. The system of claim 11 , wherein the first neural network has been trained to provide outputs corresponding to multiple context-dependent states that are derived from a plurality of context-independent states using one or more decision trees. 16. The system of claim 14 , wherein the multiple context-dependent states are derived from the plurality of context-independent states using divisive, likelihood-based K-means clustering.