Detecting Generalized Synchronization of Chaotic Dynamical Systems: A   Kernel-based Method and Choice of Its Parameter
  An approach based on the kernel methods for capturing the nonlinear interdependence between two signals is introduced. It is demonstrated that the proposed approach is useful for characterizing generalized synchronization with a successful simple example. An attempt to choose an optimal kernel parameter based on cross validation is also discussed. 
Hiromichi Suetani, Yukito Iba, and Kazuyuki Aihara