def update_gradients_full(self, dL_dK, X, X2=None):
dvar, dw, db = self._comp_grads(dL_dK, X, X2)[:<NUM_LIT:3>]<EOL>self.variance.gradient = dvar<EOL>self.weight_variance.gradient = dw<EOL>self.bias_variance.gradient = db<EOL>
Derivative of the covariance with respect to the parameters.