Module Cov_lin_one

module Cov_lin_one: sig .. end

k(x, y) = x*inv(P)*y + 1/t^2 logtheta = log(t)

where P is a diagonal matrix containing t^2 along the diagonal.

module Params: sig .. end

module Eval: Eval 
    with type Kernel.params = Params.t 
    with type Inducing.t = mat 
    with type Input.t = vec 
    with type Inputs.t = mat

module Deriv: Deriv 
    with module Eval = Eval 
    with type Hyper.t = [ `Log_theta ]