Hyperbolic initializer

[MartinuzziFrancesco]

Paper

https://arxiv.org/pdf/2508.18196

A signature for this could be

function rand_hyper(
    rng::AbstractRNG, ::Type{T}, dims::Integer...;
    radius::Number = T(1.0), sparsity::Number = T(0.1), std::Number = T(1.0),
    return_sparse::Bool = false, d::Int = 2, sigma::Number = T(1.0)
) where {T <: Number}

I'll update with some basic implementation in the next few days. Init specific kwargs also need to be more expressive. The important part in the paper is Algorithm 1 (page 4)

Official implementation

Should appear here https://github.com/deepdyn/HypER