1. A system comprising: a plurality of execution units; a memory; and a controller embedded in a processing component coupled to the memory and coupled to the plurality of execution units, wherein the controller is operable to direct execution mode selection with respect to said plurality of execution units, wherein the controller is further operable to: engage in definition operations, establish a plurality of definition pairs that map definition characteristics to execution modes by performing guided machine learning based training, and execute adaptive selection of an execution mode on-the-fly while running in real time.