relu_struct_forward.rs

/// Perform forward pass through the ReLU activation function.
fn forward(&mut self, x: &Array2<f64>) -> Array2<f64> {
    // Calculate dy/dx for backpropagation
    let dy_dx = x.mapv(|val| if val > 0.0 { 1.0 } else { 0.0 });

    // Store dy/dx for later use in backward pass
    self.dy_dx = Some(dy_dx);

    // Get the output of the ReLU activation function
    self.get_output(x)
}