Constant favannat::network::net::activations::SIGMOID

pub const SIGMOID: fn(_: f64) -> f64 = |val| 1.0 / (1.0 + (-4.9 * val).exp()); // {<[closure@src/network.rs:288:45: 288:83] as std::ops::FnOnce<(f64,)>>::call_once as fn(f64) -> f64}