pub trait PositiveDefiniteKernel<T>: Clone + Debug + Send + Syncwhere
T: Value,{
fn params_len(&self) -> usize;
fn value(&self, params: &[f64], x: &T, xprime: &T) -> Result<f64, KernelError>;
}
pub trait PositiveDefiniteKernel<T>: Clone + Debug + Send + Syncwhere
T: Value,{
fn params_len(&self) -> usize;
fn value(&self, params: &[f64], x: &T, xprime: &T) -> Result<f64, KernelError>;
}