gc_sigma2_hat_null_exact
                        Estimate Innovation Variance Under the Null
                        Model
granger_rkhs            Nonlinear Granger Causality Test via
                        Conditional Centering in RKHS
kernel_gaussian_tau     Gaussian Kernel with Bandwidth Parameter
kernel_gram             Construct an Empirical Kernel (Gram) Matrix
lagged_design           Construct Lagged Design Matrix for VAR Models
nlVAR_sim               Simulate a Nonlinear Vector Autoregressive
                        Process
