module type Deriv = sig
.. end
Derivatives of covariance functions
module Eval: Interfaces.Specs.Eval
Derivatives always require evaluation functions
module Hyper: sig
.. end
Hyper parameters that have derivatives
module Inducing: sig
.. end
Derivatives of the covariance matrix of inducing inputs
module Inputs: sig
.. end
Derivatives of the (cross-) covariance matrix of inputs.