CodePudding user response:
Compound function is not simple, and get to know a little bit of power system knows, even if it is x ^ 2 + c such a simple quadratic function, after iterative many times also can produce very complex/chaotic dynamics behavior, neural network, of course, not necessarily from the Angle of the discrete dynamic system, but multiple complex nonlinear function, indeed can be used for fitting is very complex mapping, the devil is nonlinear, most of the complexity of nature from the nonlinear,