Function gauss_newton_log 

pub fn gauss_newton_log<S: ConformallyFlat<Point = Vec3, Vector = Vec3>>(
    space: &S,
    from: Vec3,
    to: Vec3,
    n_steps: u32,
    max_iters: u32,
) -> Vec3

Solves exp_from(v) ≈ to; failure returns the last finite iterate.