1. A neural network controller for a plant which has a desired plant performance parameter represented by a reference signal and which has an actual plant performance parameter represented by an actual performance signal, said neural network controller comprising: a first input port for inputting a controller weights adjust signal; a second input port for inputting a dumb control signal; neural network means coupled to said first and second input ports for receiving said inputted controller weights adjust signal and dumb control signal, and for processing said inputted dumb control signal in accordance with said inputted controller weights adjust signal to generate a plant control signal; an output port for outputting said plant control signal; and input signal combiner means coupled to said first input port for receiving and combining a reference signal and an actual performance signal and for providing in accordance therewith a first performance error signal, wherein said reference signal represents a desired plant performance parameter, said actual performance signal represents an actual plant performance parameter and said first performance error signal represents a first difference between said desired plant performance parameter and said actual plant performance parameter.