#[gradient]Expand description
Emit the original function unchanged, plus {fn}_gradient(x: &[f64]) -> [f64; dim]
where element i is ∂f/∂x[i] in closed form.
#[gradient]Emit the original function unchanged, plus {fn}_gradient(x: &[f64]) -> [f64; dim]
where element i is ∂f/∂x[i] in closed form.