13. The machine-readable medium of claim 1 , wherein the trainable semantic vector is reduced by selectively setting a value of at least one selected vector entry to zero.
13. The machine-readable medium of claim 1 , wherein the trainable semantic vector is reduced by selectively setting a value of at least one selected vector entry to zero. 14. The machine-readable medium of claim 13 , wherein the at least one selected vector entry has a value less than a predetermined threshold.