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use activation::Activation;
#[derive(Copy, Clone)]
pub struct RectifiedLinearUnit;
impl RectifiedLinearUnit {
pub fn new() -> RectifiedLinearUnit {
return RectifiedLinearUnit;
}
}
impl Activation for RectifiedLinearUnit {
fn calc(&self, x: f64) -> f64 {
if x <= 0f64 {
0f64
} else {
x
}
}
fn derivative(&self, x: f64) -> f64 {
if x <= 0f64 {
0f64
} else {
x
}
}
}
#[cfg(test)]
mod tests {
use super::Activation;
use super::RectifiedLinearUnit;
#[test]
fn rectifiedlinearunit_test() {
let activation = RectifiedLinearUnit::new();
assert_approx_eq!(activation.calc(3.4f64), 3.4f64);
assert_approx_eq!(activation.calc(-3.4f64), 0f64);
}
#[test]
fn rectifiedlinearunit_derivative_test() {
let activation = RectifiedLinearUnit::new();
assert_approx_eq!(activation.derivative(-3.4f64), 0f64);
assert_approx_eq!(activation.derivative(3.4f64), 3.4f64);
}
}